AS2523, AS2524(B) Datasheet by ams

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mfimm 1 ‘ I . .
austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
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Revision 1.13 Page 1 of 19
austriamicrosystems
Key Features
-Line/Speakerphone circuit on a 28-pin CMOS-IC, simple
inventory: same die for AS2523/24 and AS2523/24B
-Serial I/F on AS2523, parallel I/F on AS2524
-Enhanced voice switching
-Background noise monitoring
-Tx- and Rx-gain programmable on AS2523 only
-Digital volume control of Rx signals on AS2523 only
-DC characteristic programmable on AS2523 only
-Dual softclipping in handset mode on AS2523 only
-Dual softclipping in handsfree mode on AS2523 only
-Loudspeaker amplifier for loudhearing and handsfree
-Supply voltage generation for external circuitry
-Automatic line loss compensation on AS2523 / 24B only
-Real and complex impedance selectable by external
components
-Side tone adaptation selectable by external components
-Unique EMC performance
-Operating range from 15mA to 100mA (down to 5mA
with reduced performance)
-Few external components
General Description
AS2523/24 is a CMOS integrated circuit that incorporates
DC and AC line adaptation (DC-mask and synthesized AC-
impedance of 1000:) as well as a speech circuit with
softclipping, line loss compensation and Rx-volume control
for handset and handsfree operation. It shall act as an a/b-
line powered device, which is controlled by a CPU via a
serial interface on AS2523 or a standard dialler via a
parallel interface on AS2524 and AS2524B.
Applications
Enhanced handsfree feature phones with CallerID and
extended displays. The AS2524 and AS2524B are
developed to interface with common Taiwanese dialers.
Package
Available in 28-pin SOIC or die
Block Diagram
Telephone Line Interface and
Speakerphone Circuit
AS2523, AS2524, AS2524B DATA SHEET
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 2 of 19
Pin description
Pin # Symbol Function
15 LS Line Current Sense Input
Analog input for sensing the line current
12 LI Line Input
Analog input used for power extraction and line current sensing
13 RI Receive Input
Analog input for ac-separated receive signal
9 STB Side Tone Balance Input
Analog input for side tone cancellation network
10 CS Current Shunt Control Output
N-channel open drain output to control the external high power shunt transistor for
synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during
make periods of pulse dialing
16 CI Complex Impedance Input
Analog input pin for the capacitor to program a complex impedance
14 SS Supply Source Control Output
N-channel open drain output to control the external high power source transistor for supplying
(Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode
11 VSS Voltage Source Source
Negative Analog Power Supply
18 VDD Voltage Drain Drain
Positive Analog Power Supply
19 AGND Analog Ground
Special ground for the internal amplifiers
8 M1 Microphone Input 1
Differential input for the handset microphone (electret)
6 M2 Microphone Input 2
Differential input for the handset microphone (electret)
7 M3 Microphone Input 3
Differential input for the handsfree microphone (electret)
5 M4 Microphone Input 4
Differential input for the handsfree microphone (electret)
17 RO Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150:to 300:
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 3 of 19
Pin # Symbol Function
25 xCS Chip Select on AS2523
Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )
/xMUTE Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B
26 DI Data Input on AS2523
Data input of the serial interface. Internal pull-up resistor ( 100kOhm )
/xPD Power down mode for AS2524 and AS2524B (On-hook)
27 CLK Clockon AS2523
Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )
/HFE Handsfree mode operation on AS2524 and AS2524B
23 LO Loudspeaker Output. Output pin is for a 25:loudspeaker
2 FT1 Analog input pin for connecting a capacitor for offset cancellation.
3 TXO Analog output of the transmit signal
4 TXV Analog input for the transmit signal in the voice switching path
1 CBN Analog input pin for connecting a capacitor for background noise monitoring.
20 RECI Analog input for the handsfree receive path. Should be connected to RO via coupling
capacitor.
21 RECV Analog input for receive voice switching path.
24 VSSA Power supply pin for LO output amplifier.
22 VPP Power supply pin for LO output amplifier.
28 TONEIN Analog input for DTMF-signals.
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 4 of 19
Detailed Block Diagram
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 5 of 19
Functional Description
DC conditions
The normal operating mode is from 15mA to 100mA. An
operating mode with reduced performance is from 5mA to
15mA. In the line hold range from 0mA to 5mA the device
is in a power down mode.
The DC characteristic is determined by the voltage at LI-
pin and a 30:resistor between LI- and LS-pin. It can be
calculated by the following equation: VLS = VLI + ILine *
30:. VLI can be programmed to be 3.5V or 4.5V.
2/4 wire conversion
AS2523/24 has built in two Wheatstone bridges with one
common ground. This provides a maximum of
independence of AC-impedance and side tone from each
other. One can adapt side tone without changing the AC-
impedance.
AC-impedance
The AC-impedance of AS2523/24 is set to t.m. 1000:.
With the external capacitor at CI-pin it can be programmed
complex. With an external resistor of approx. 1.5k:
connected to the LS-pin it can be programmed to 600:.
Side Tone
A good side tone cancellation can be achieved by using the
following equation:
ZBAL/ZLINE = 10
Transmit path
The gain of the M1/M2 oLS is set to +37dB. This gain
can be changed by programming on AS2523 from +30dB to
+45dB in 1dB steps (Register Txgain), on AS2524 / 24B it
is set to +37dB per default. The input is differential with an
impedance of 10k:. The soft clip circuit limits the output
voltage at LS to 2Vp. There is LLC for this path.
The gain of the M3/M4 oLS is set to +46dB.
This gain can be changed by programming from +39dB to
+54dB in 1dB steps on AS2523. The input is differential
with an impedance of 10k:. The soft clip circuit limits the
output voltage at LS to 2Vp. There is no LLC for this path.
Receive path
The gain of the LS oRO receive path is set to +7.5dB.
This gain can be changed by programming from7.5dB to
+7.5dB in 1dB steps (Register Rxgain). The receive input
is the differential signal of RI and STB. The soft clip circuit
limits the output voltage at RO to 1Vp. It prevents harsh
distortion and acoustic shock. There is LLC for this path.
The gain of the LS oLO receive path is set to +32dB.
This gain can be changed by programming from +19dB to -
34dB in 1dB steps. The user can also change the gain via
Register Handsfree receive end gain (See section
"Handsfree"). The receive input is the differential signal of
RI and STB. The soft clip circuit limits the output voltage at
LO to 1.1Vp. It prevents harsh distortion and acoustic
shock. There is optional LLC for this path.
Line Loss Compensation (AS2523, AS2524B)
-programmable on AS2523
-not activated at AS2524
-permanently activated at AS2524B
When it is activated, the transmit and receive gains for
both I/O’s are decreased by 6dB at line currents from
20mA to 50mA or from 45mA to 75mA.
Handsfree
The handsfree function allows voice communication without
using the handset (full 2-way speaker phone). Two voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the microphone. The voice switching
circuit has three states, namely idle, transmit or receive. In
receive mode the attenuation of the receive path and the
transmit path can be controlled by Register Handsfree
receive end gain between 0dB and -20dB. The following
table shows how voice switching is controlled
TX_atten Backgnd
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RX
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 6 of 19
0mV
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Gmax = -4dB … +16dB (Vol)
Gmin = -33dB
Offset
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LINE Gmax = +9dB
Gmin = -21dB … -40dB (Vol)
+9dB
RECV
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TXO TXV
Speech Mode Rx-gain Tx-gain Remark
Rx > Tx_atten X Receive 0db to -20dB -50dB to -30dB adjustable with VOL-setting
Tx_atten > Rx NO Idle -25 -25 middle position
Tx_atten > Rx YES Transmit -50dB 0dB independent of VOL-setting
-50dB
-25dB
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Vol minVol defaultVol max
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RX-gain
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 7 of 19
Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only)
The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated
at the AS2524B.
Figure 1 Typical Tx Gain Characteristics Line Loss Compensation
Figure 2 Typical Rx Gain Characteristics Line Loss Compensation
f = 800 Hz
ZLINE = 600
:
V
LS = -10 dBm
20 30 40 50 60 70 80 (mA)
DC Line
Current
No LLC (AS2523, AS2524)
LLC high
(AS2523,AS2524B)
LLC low
(AS2523)
Tx Gain(dB)
29
30
31
32
33
34
35
f = 800 Hz
ZLINE = 600
:
V
LS = -10 dBm
V
OL = 0 dB (neutral)
20 30 40 50 60 70 80 (mA)
DC Line
Current
Rx Gain(dB)
-2
-1
0
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+2
+3
+4 No LLC (AS2523, AS2524)
LLC high
(AS2523,AS2524B)
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 8 of 19
Serial Interface on AS2523
Registers
The settings of the AS2523 are stored in 16 registers. Each
register has 4 bit data width.
Timing
The data format for writing to a register has the following form:
A3 A2 A1 A0 D3 D2 D1 D0
xCS
CL
K
DI
Note: The pins xCS,CLK,DI have internal pull-up resistors.
Parameter Symbol MIN TYP MAX
CLK Pulse width HIGH T6 100ns
CLK Pulse width LOW T5 100ns
xCS to first falling CLK-
edge setup time
T1 50ns
DIN to CLK setup time T3 50ns
DIN to CLK hold time T4 50ns
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 9 of 19
Serial interface Registers
The following table shows the content of the 16 control registers.
For a detailed description of the commands see Application note AN523/24.
Control registers AS2523
AAAA DDDD
3210 3210
0000 Nop na na
0001 na na
0010 na na
0011 na na
0100 xxxx Conf-Tone: 0... No Conf Tone 1... Conf Tone 0111 0111
Conf
Liv
Llc1
Llc0
LIV: Voltage at pin LI 0...3.5V, 1...4.5V
LLC1 LLC0: Line loss compensation setting
0 0 20mA-50mA
0 1 NO Line loss compensation
1 0 45-75mA
1 1 NO Line loss compensation
0101
Burs
Burl
CT1
CT0
BURS: Analog tone at RO 0...OFF, 1...ON
BURL: Analog tone at LS 0...OFF, 1...ON
CT1 CT0: @RO @LS
0 0 -36dB -15dB TONE-confidence level
0 1 -30dB -9dB rel. to pin LS
1 0 -24dB -3dB
1 1 -18dB +3dB
0001 0001
0110 xxxx Softclip-settings, Tx_comp_gain settings 1000 1000
tx_comp_gain Bit 1
tx_comp_gain Bit0
Soft-RX
Soft-TX
Bit1 Bit0 :Tx_comp_gain
0 0 +8dB
0 1 +11dB
1 0 +14dB
1 1 +17dB
SOFTRX: Softclip RX 0...OFF, 1...ON
SOFTTX: Softclip TX 0...OFF, 1...ON
0111
Rxoffset Bit1
Rxoffset Bit0
Delay_10ms
Bnon
Bit1 Bit0: Rx-offset setting
0 0 0mV
0 1 12mV
1 0 40mV
1 1 100mV
Delay_10ms 0... no delay 1... 10ms delay
Bnon 0... BGN off 1... BGN on
0101 1100
1 0 0 0 16 gains Handsfree receive endgain 1111 1011
Data RXgain TXgain
0x0 -20dB -30dB Min. receive volume
: :
0xF +0dB -50dB Max. receive volume
1001 xxxx 0000 1100
off1 off0: BGN-offset
0 0 120mV
0 1 180mV
1 0 240mV
1 1 300mV
off1
off0
Hfs1
Hfs0
Hfs1 HFs0: Speed of voice switching
0 0 max speed
0 1
1 0
1 1 min speed
1 0 1 0 16 gains Transmit gain [16], 16 steps, 1dB stepsize 0111 0111
Data HS-mode HF-mode
0x0 30dB 39dB
: : :
0xF 45dB 54dB
1 0 1 1 16 gains Receive gain [16], 16 steps, 1dB stepsize 1111 1111
Data HS-mode HF-mode
0x0 -6dB 19dB
: : :
0xF +9dB 34dB
Address Data
for AS2523,
AS2524HF
for AS2524 LH bond
option
Default value
after reset
1100
HP_on
Rec_on
Mute
Tone
HP_on : 0... fg=200Hz 1... fg=2000Hz
rec_on : 0... Rxcomp=AGND 1... Rxcomp=RECV
Mute : 0... No mute 1... Tx-path muted
Tone : 0... Tx-signal path 1... Ton in signal path
0100 1000
1101 xxxx Mask, Lh, Hf, Hook Switch 0100 0101
Mask: 0... No mask 1... Mask acitivated
Mask
His
Hf
LH
His HF LH: Hook functions
0 x x Power down
1 0 0 Handset
1 0 1 not allowed
1 1 0 Handsfree
1 1 1 Loudhearing
1110 xxxx 0000 0001
Krat5
Test3
Test2
slow_rec
slow_rec: fast change to TX, slow change to RX, no IDLE
Krat5,Test3,Test2: For factory test only !
1111 xxxx Reset to defaults na na
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0... B 0... B
endgainndgain
ain TXgainain TXgain
0dB -30dB 0dB -30dB
:
:
+0dB -50
+0dB -50
ms
ms
a
a
AG
FF, 1...ON
1...ON
F, 1...ON
1...ON
G
G
A
A
Technical
T
0m
240mV40mV
300mV 0mV
s0:
Speed of voice
Speed of voice
0 max speedmax speed
1
1 00
1 1 min spe 1 1 min sp
Transmit gain [16], 16Transmit gain [16],
DataDa
HS-mo HS-
0x0 30x0 3
:
0xF
1
16 gains Rec16 gains Re
hn
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c
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ch
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ni
ni
ic
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n
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110000
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110110
TeTe
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c
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content
.. 10ms delay. 10ms delay
1... BGN on . BGN on
0
0
eive volumevolume
receive volumeeive volume
nt
nt
nt
nt
te
te
on
on
still
00
10001000
l
l
sti
sti
til
til
valid
v
v
v
reset m the st maybe rewritten In at event (handset i case at unexpected Inss . Re-wiiling aii registers y register ailionai command ower-up sequenc' p sequence wiii require the hg. he the cause oi power-up and set register D accord Deiadit = handset mode b) Senhe L| Vinita Line Loss Com r2) Setthe Caniid whlch is und notse more weight on Rx) me egister a e) Selm voice switching spee Eackg e monitoring oiiset deiau rlching speed = ims detau niiorrng onset = 240 Txlev equii toswttchiromid Ad .tonal settings Dunng a Hash. tn avoid discharge Set the MASK b Aiter the line on cleared a as VD is rem
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 10 of 19
Programming Guidelines for the AS2523
The AS2523 is programmed by means of a serial 8-bit shift
register. MSB is clocked in first, LSB last.
The first four bits (7,6,5,4) are the addresses of the
registers, the last four bits (3,2,1,0) are the data bits.
Each register has a default setting (see data sheet), which
is set after power-up of the chip.
The internal registers are RAM-cells. When the AS2523
loses VDD (as in on-hook state) it also loses the register
contents.
It is therefore necessary to re-write the affected registers
after each hook event. The register contents cannot be
read, they can only be written.
Registers need to be re-written after each power-up and
after each hook event (handset / handsfree / on-hook).
It is recommended to always initialize the chip with a “reset
to defaults command (Fx) first and then write the
appropriate registers that need to be changed from the
default setting.
Alternatively, all registers (4 to 16) may be re-written in a
bulk at each power-up and hook event (handset /
handsfree / on-hook).
This guarantees safe operation in case of unexpected loss
of power during normal operation. Re-writing all registers
also eases later software updates, as only register
contents need to be changed, but no additional command
lines need to be inserted.
Example of a typical power-up sequence
A typical power-up sequence will require the following
programming.
a) determine the cause of power-up (handset / handsfree
mode) and set register D accordingly.
Default = handset mode
b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and
Line Loss Compensation (default = off) in register 4
c) Set the Confidence Tone level (e.g. the DTMF level
which is audible in the handset) and path in register 5
Default = off
d) Set the required Tx and Rx gains in Registers A and B
Default = 37dB Tx gain, 1dB Rx gain
Additional settings in Handsfree mode
Note: change the default settings only if necessary:
a) A click-free startup can be achieved by starting up in
handset mode (=default) and then switching to
handsfree, once the chip has stabilized.
b) Change the Tx comparator preamplifier gain in register 6
Default = 14dB
c) Change the Receive DC offset and Background noise
monitoring in Register 7
default = 0mV offset (higher val. puts more weight on Rx)
switching delay default = on
Background Noise Monitoring = on
d) Set the speaker amplifier volume in register 8
Default = 0B
e) Set the handsfree voice switching speed and
Background Noise monitoring offset in register 9:
default voice switching speed = 1ms/6dB (fastest)
default BGN monitoring offset = 240mV (determines the
Tx level required to switch from idle to Transmit)
Additional settings during Flash
During a Flash, the AS2523 should be powered down to
avoid discharge of VDD:
Set the MASK bit (bit3 in register D) to 1
After the line current is restored, the MASK bit must be
cleared again. Other settings do not need to be re-written,
as VDD has not discharged. As a safety margin however, it
is recommended to re-write all registers after a flash
Additional settings during line breaks
If a line-break-detection (brief interruption of the line while
in off-hook state) is implemented, the same rules apply as
for a Flash: set the MASK bit to 1 to avoid discharge of
VDD. It is recommended to re-write all registers after a
line-break, as a line break may take long enough to
discharge VDD, even when the MASK bit was set.
General Rules
The serial interface may be programmed at any time, it
does not affect the speech quality, e.g. if a register is
overwritten with the same value.
It is also possible to re-write all registers periodically. The
register is static, therefore it can be clocked at any speed
up to 5MHz.
However, electromagnetic pulses on the clock and data
lines may cause unwanted programming of the chip. It is
therefore recommended to keep these lines short, filter
them by a discrete lowpass filter and reduce the clock
speed accordingly.
ams
he
re re
--
written in written in
(handset / handset /
ase of u
se of
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eset
et
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Ba
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T
Technical
T
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er
-
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ence will require thce will require
the cause of powethe cause of powe
and set register Dset register D
ault = handset mo= handset m
b)b)
Set the LI voltaet the LI volta
Line Loss Cne Loss
c)
Set t
Set
w
conten
cted loss ss
l registers
gisters
ter
r
mand
mand
ent
requir
equir
itional settings
nal settings
During a Flash, thng a Flash, th
avoid disoid dis
chargcharg
Set the MASet the MA
After thAfter th
cleacle
still
me
me
ce switching spee
ce switching spee
monitoring offsetonitoring offset
witching speed =
hing speed =
onitoring offse
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o switchswitc
valid
oise oise
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egister 8egister 8
Puwev dawn Puwev dawn Puwev dawn Puwev dawn Tone mode Tone mode Handse| made Handshee mode he Puwerdown made ‘5 used deacuvated) V LLC high (45mA Io 75mA) +43dB +7 SdB +7 SdE O" 0" OH O" O" OH e1M37M4, RU achve LO actw 4.5V N0 LLC m Mad RXVGam +34d Soflchp o T»smmnp Tone BNM
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 11 of 19
Parallel Interface on AS2524 and AS2524B
Input Signal on Pin
XPD xMute HF Mode
0 0 0 Power down
0 0 1 Power down
0 1 0 Power down
0 1 1 Power down
1 0 0 Tone mode
1 0 1 Tone mode
110Handset mode
1 1 1 Handsfree mode
Power down mode
For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used
during Flash and Pulse dialing and for On-hook operation.
Handset mode
Speech mode is Handset mode (M1-M2, RO active; LO deactivated)
Parameter AS2524 AS2524B
LI Voltage 4.5V 4.5V
LLC No LLC LLC high (45mA to 75mA)
TX-Gain +37dB +43dB
RX-Gain +7.5dB +7.5dB
Rx-Softclip Off Off
Tx-Softclip Off Off
Tone Off Off
Handsfree mode
Speech mode is Handsfree mode (M3-M4, RO active; LO active)
Parameter AS2524 AS2524B
LI Voltage 4.5V 4.5V
LLC No LLC LLC high (45mA to 75mA)
HF TX-Gain +46dB +52dB
HF RX-Gain +34dB +34dB
Rx-Softclip Off Off
Tx-Softclip Off Off
Tone Off Off
BNM On On
ams
LL
LL
s
s
s
s
s
ms
ms
ms
ms
ms
Offff
m
OffOff
am
ff
a
AG
activated)ctivated)
AG
AS25
AG
4
A
ig
i
A
Te
T
BNMBNM
T
Technic
+46+4
nical
-
M4, RO acti, RO ac
cal
24
al
4.5V4.5V
ca
No LLCNo LLC
ic
nic
h
h
h
hn
h
lip
h
h
hn
ch
Softclipp
ch
ch
h
ch
Tonee
ec
Tec
T
T
Te
content
t
t
t
t
t
t
nt
A to 75mA)5mA)
nt
nt
nt
43dB4
en
n
+7.5dB7.5dB
te
OffOff
nt
OffO
n
on
c
c
c
co
still
ower down mower down
valid
e
4.5V mgn (45m to 75mA) .4auB +7.5u5 0n Deactlvamd ZODDKHZ [10" mm TX07>TXV) slSdB SOOMV S d with the Tes| (New va‘ues WHI n01 be lasted tings $9 en| thtage (LS’y manage (LL cg) Ac Vollage (STB, PH) Digilm Inpul vmtage E‘eclwsiatlc D Slorage Temp
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 12 of 19
Tone mode
This mode is used to send DTMF and FSK data to the line.
Speech mode is Tone mode (M1-M2;M3-M4 muted, Rx path muted, RO and LO active)
Parameter AS2524 AS2524B
LI Voltage 4.5V 4.5V
LLC No LLC LLC high (45mA to 75mA)
Tone TX-Gain +14dB +14dB
Confidence tone
level
-36dB@Ro –15dB@Lo
relative to Pin LS
-36dB@Ro –15dB@Lo
relative to Pin LS
Loudhearing AS2524 and AS2524B (feature only available as DIE)
Speech mode is Loudhearing (M3-M4, RO active; LO activated).
Loudhearing can be activated via a bond-option (see document “AS2523/24 Delivery as Dice”).
Parameter AS2524 AS2524B
LI Voltage 4.5V 4.5V
LLC No LLC LLC high (45mA to 75mA)
TX-Gain +37dB +43dB
RX-Gain +7.5dB +7.5dB
Tone Off Off
Slow_rec On On
RECV pin Deactivated Deactivated
Highpass 2000kHz (10nF from TXO->TXV) 2000kHz (10nF from TXO->TXV)
Voice switching speed 120ms/6dB 120ms/6dB
RX-Offset 300mV 300mV
Electrical characteristics
Electrical characteristics are measured with the Test Circuit
application. Typical mean values will not be tested.
Absolute maximum ratings
Positive Supply Voltage -0.3V <= VDD <= 7V
Input Current +/- 25mA
Input Voltage (LS) -0.3V <= Vin <= 12V
Input Voltage (LI, CS) -0.3V <= Vin <= 8V
Input Voltage (STB, RI) -2V <= Vin <= VDD+0.3V
Digital Input Voltage -0.3V <= Vin <= VDD+0.3V
Electrostatic Discharge (HBM 1.5k:-100pF) +/- 1000V
Storage Temperature -65°C to +125°C
Recommended operating conditions
Supply Voltage (generated internally) 3V <= VDD <= 5V
Operating Temperature -25°C to +70°C
ams
O
OnOn
s
DeactivDeactiv
ms
2000kHz (10n2000kHz (10
m
am
a
a
a
a
a
a
AG
G
G
G
G
G
G
G
B
B
AG
G
G
G
.5dB
AG
A
A
Tec
T
echnic
age
ical
d with the Th the
will not be tested.
ot be tested
ngsng
ic
ni
e (LS)e (LS)
hn
oltage (LI, CS)ge (LI, CS
h
ut Voltage (STB, age (STB
ch
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ec
ElectrostaticElectrostati
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Storagetorag
T
T
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t
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te
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te
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--
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300mVmV
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Ci
still
till
2
4B
ll
4.5V.5V
til
high (45mA to 75
h (45mA to 7
ti
+43dB+43dB
st
7
s
valid
V V V mA N Emed Conditions mm Type ZAc1syn):1000gz 35 +36 39 4 a LS Z 710000 ZAC1synp=Iooosz vrequency u: so ro‘ range we 5 M2 a LS Comm vange MZ/MA —> L5 THD Distonlon VAGCV Soft (mg Leve‘ mm a VAecz Snu C MS/M Asco
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 13 of 19
DC characteristics
ILine=15mA w/o operation of any additional external
circuitry, unless other specified
Symbol Parameter Conditions Min Type Max Units Test
IDDS Operating Current Speech Mode 3 6 mA Y
IDDH Operating Current Handsfree Mode 7 10 mA Y
VLI Line Voltage LIVolt=0
Line Voltage LIVolt=1
15mA<=ILINE<=100mA 3.2
4.2
3.5
4.5
3.8
4.8
V
V
Y
Y
IOL Output Current, Sink
CS,SS VOL=0.4V 1 mA N
Transmit characteristics
ILine=15mA f=800Hz, default settings unless other specified
Symbol Parameter Conditions Min Type Max Units Test
AM1/2TX Transmit Gain M1/M2 oLS
AS2524
AS2524B
ZAC(syn)=1000:
35
39
+36.5
+42.5
38
44
dB
dB
Y
Y
AM3/4TX Transmit Gain M3/M4 oLS
AS2524
AS2524B
ZAC(syn)=1000:
43
49
+45.0
+51
47
53
dB
dB
Y
Y
Atone TX Transmit Gain
Tone oLS
ZAC(syn)=1000:12 +14dB 16 dB Y
'ATX Variation with frequency f = 500Hz … 3.4kHz ±0.8 dB N
AVRM12 Control range
M1/M2 oLS
16 steps -7/+8 dBr N
AVRM34 Control range
M2/M4 oLS
16 steps -7/+8 dBr N
THD Distortion VLS=0.25VRMS 2 % Y
VAGC1 Soft Clip Level
M1/M2 oLS at LS
2 VP N
VAGC2 Soft Clip Level
M3/M4 oLS at LS
2 VP N
ASCO Soft Clip Overdrive
M1/M2 - M3/M4
20 dB N
tattack Attack time 70 us/6dB N
tdecay Decay time 100 ms/6dB N
ams
s
ZZ
AC(syn)=AC(syn)=
100
10
s
m
4
oo
LSLS
ZZ
am
m
m
m
AG
fied
ed
A
ion
A
Techn
T
hnical
al
ncy
f = =
5
5
al
al
al
al
S
ca
a
a
a
ol rangenge
/M4 /
oo
LSLS
nic
Distortionortio
hn
c
GC1
Soft Clip Soft Cl
M1/MM1/M
c
c
ch
T
ec
VV
AGC2AGC2
T
Te
e
e
T
e
T
cont
)
ntent
e
e
e
nt
ent
Min
nt
nt
Typ
nt
nt
nt
e
nt
3535
e
e
en
n
n
te
n
=1000
::
nt
C(syn)
(syn)
=100=10
co
still
mAmA
ll
l
l
l
valid
a
Y
Y Y
a
a
va
N
va
va
va
dBmp dEmp dB Emed COM ens Astynj=VODO Vol deiaul’ Mm Type +75 ZACls maooun Vol X‘mum +310 ‘1 la 3.4kHz 15 sleps ge a L0 15 steps D‘s‘onlon LO VLS D‘smnion R0 C Unwanted Flag. 0 VAGCRO Soft Uhp Leve‘ R0 VAGCLS 50H Chp L LO
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 14 of 19
Symbol Parameter Conditions Min Type Max Units Test
ZIN-M1/2 Input Impedance
M1/M2
10 k:N
ZIN-M3/4 Input Impedance
M3/M4
10 k:N
VINmax Input Voltage Range
M1/2 - M3/4
differential ±1 Vp N
VNO Noise Output Voltage
LS
TAMP=25°C
Handset mode
Gain = 36.5dB
Gain = 42.5dB
-72
-66
dBmp
dBmp
N
Y
AMUTE Mute Attenuation Mute activated 60 dB Y
Receive characteristics
ILine=15mA f=800Hz, default settings unless other specified
Symbol Parameter Conditions Min Type Max Units Test
ARO Receive Gain
LS oRO
ZAC(syn)=1000:
Vol default
6 +7.5 9 dB Y
ALO12 Receive Gain
LS oLO
ZAC(syn)=1000:
Vol maximum
+32.0 +34 +36.0
dB Y
'ARX Variation with frequency f=500Hz to 3.4kHz ±0.8 dB N
AVRRO Control range
LS oRO
16 steps -7/+8 dBr N
AVRLS Control range
LS oLO
16 steps -7/+8 dBr N
THDLS Distortion LO VLS=0.25VRMS 5 % Y
THDRO Distortion RO VLS =0.25VRMS 2 % Y
VUFC Unwanted Freq. Cmp. f = 200 … 20kHz -60 dBm Y
VAGCRO Soft Clip Level
RO
1 VP N
VAGCLS Soft Clip Level
LO
1.1 VP N
ASCLS Soft Clip Overdrive
LO
10 dB N
Tattack Attack time 70 us/6dB N
Tdecay Decay time 100 ms/6dB N
ams
ms
ondition
s
AC(syn)AC(syn)
=1000=1000
Vol defaultVol defau
ms
am
ZZ
AC(sAC(s
VolVo
a
am
am
am
AG
fied
ed
A
A
T
A
SC
Techn
T
hnical
16 step6 ste
a
16 steps16 step
a
a
al
ca
LO
ic
c
c
c
ortion RORO
ni
Unwanted Freqwanted Fre
hn
c
GCRO
Soft Clip LSoft Clip
RORO
c
c
ch
T
ec
VV
AGCLSCLS
e
SS
T
Te
e
e
T
e
T
T
content
t
t
en
ten
n
en
t
ent
Type
n
n
nt
t
t
t
en
t
6 6
t
t
te
e
e
nt
e
0
:
um
++
nt
nt
nt
nt
Hz to 3.4kHz
o 3.4kHz
co
c
still
ll
ll
ll
ll
valid
id
mp
dBmp
N N
Y Y
id
id
v
alid
v
v
v
v
sva c. m vss VSSA 55 VD A5252: 20 YONE m M: m m 02» 02? Hindu—
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 15 of 19
Symbol Parameter Conditions Min Type Max Units Test
VNO Noise Output Voltage
RO
TAMP=25°C
Gain = 7.5dB
-68 dBmp Y
ZIN-RI
VINmax
Input Imp. RI
Input Voltage Range RI
8
±2
k:
Vp
N
ZIN-STB
VINmax
Input Imp. STB
Input Volt. Range STB
80
±2
k:
Vp
N
ST Side tone VRI<=0.25VRMS 26 dB Y
RL
'ZAC/°C
Return Loss
Temp. Variation
ZAC(syn)=1000:18
0.5
dB
:/°C
Y
Test circuit
VSS
R2 32R
C2
1uF
VSS
VSS
U2
AS2523/24
17
20
21
23
25
26
27
1
4
3
2
19
18
22
14
24
11
16
10
9
12
13
15 28
7
5
8
6
RO
RECI
RECV
LO
xCS / xMUT E
DI / xPD
CLK / HFI
CBN
TXV
TXO
FT1
AGND
VD D
VPP
SS
VSSA
VSS
CI
CS
STB
LI
RI
LS TONE IN
M3
M4
M1
M2
C2 22uF
R1
600R
D1
10V
VSS
C6 100nF
C6 100nF
R1
6k
C6 100nFC2 1uF
Q1
BC327
D1
5V1
VSS
V3
Vac
C2 1uF
C6 100nF
VSS
R1
30R
C2 10uF
Vac
VSS
VSS
1
2
3
VSS
C2
100uF
Vac
C3
1n
VSS
Q1
BC327 C6 100nF
VSS
C4 100nF
VSS
VSS
VSS
VSS
C6 100nF
Vac R3 150R
C1 10uF
C2
100uF
I1
Idc
C2
47uF
VSS
R1
300R
C7 100uF R5
10k
R4
10k
ams
m
m
VSSVS
a
m
m
m
m
m
m
m
m
R1R1
6k
m
m
s
s
s
s
s
s
ms
C2C2
1uF
1u
s
a
a
a
a
a
ms
m
m
s
am
m
am
m
am
am
am
QQ
am
a
1
300R0R
m
AG
AG
AG
U22
A
1212
A
1313
A
1515
R
LSLS
A
A
10uF
F
A
Technical
T
a
a
VSS
47uF47uF
content
t
nt
ont
AS25A
o
1414
on
244
on
1111
nt
166
nt
10
t
2828
nt
77
n
55
VSSAVS
VSSV
CICI
CSS
STBST
NE INN
M3M3
M4
M1M1
c
co
o
o
VSSVSS
t
o
o
o
still
s
s
s
66
10
10
s
valid
a
Y Y
a
a
v
va
v
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 16 of 19
Typical application AS2523
T
T
alid
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Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 17 of 19
Typical application AS2524 and AS2524B
T
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m. 2.1m... nu "cu/m 1m; inn/an 1xv1 Inn/mm m xovssA m up 1:37 nvn m also! am um mm mm mu um uu "In mm m nu .5 u D ASZSZS T some plasuc smacc muumed package 7 as leads A52524 T some Plastic swlace mourned package , as leads A5252“? T some Plastic surlace mourned package 7 23 ASZSZS F DOF DmeruanuH A52524 F DOF cheruanuH A5252“? F DOF cheruanuH
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 18 of 19
Packaging
28-pin plastic SOIC
For exact mechanical package dimensions please see austriamicrosystemsAG packaging information.
Pin-out, Marking
YY year of production
WW calendar week of production
AAA austriamicrosystemsAG assembly ID
X 3 … AS2523 Version
4 … AS2524 Version
4B .. AS2524B Version
Ordering Information
Number Package Description
AS2523 T SOIC28 plastic surface mounted
package – 28 leads
AS2524 T SOIC28 Plastic surface mounted
package – 28 leads
AS2524B T SOIC28 Plastic surface mounted
package – 28 leads
AS2523 F DOF Dice-on-Foil
AS2524 F DOF Dice-on-Foil
AS2524B F DOF Dice-on-Foil
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wearing in ris Teim egarmng iire inmrmauon sei rosyslems AG reserves haul noirce There gningthispmdu: rem miermaiion, T mended ier use in mpeiatuie range, u .ranmemal requi or hie-sustaining e 'l are speeiiieaii inr each applieairon. ‘ is believed in be enrreer and am: prem o in d parry iar any damages rse‘ inierrur n oi business or Indireci‘ spe arising out oi the iurmsning, penormance or u or any mim party sha arise nrllow aui ai ausrriam mmumcaiions remsténen, Ausliia 3136 500 o 3136 5692 amicrnsystems.enm F0! Sales Ollices‘ Distribmols www.3uslriamicm
Data Sheet AS2523, AS2524, AS2524B austriamicrosystems
Revision 1.13 Page 19 of 19
Copyright
Copyright © 2002-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks
Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used
without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term
of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set
forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the
right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system,
it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal
commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended
without additional processing by austriamicrosystems AG for each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal
injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No
obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or
other services.
Contact Information
Headquarters:
austriamicrosystems AG
Business Unit Communications
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
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