Analog Devices Inc. 的 LT5534 规格书

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LT5534
1
5534fc
TYPICAL APPLICATION
DESCRIPTION
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
The LT
®
5534 is a 50MHz to 3GHz monolithic RF power
detector capable of measuring RF signals over a 60dB
dynamic range. The RF signal in a decibel scale is pre-
cisely converted into DC voltage on a linear scale. The
60dB input dynamic range is achieved using cascaded RF
detectors and RF limiters. Their outputs are summed to
generate an accurate log-linear DC voltage proportional
to the input RF signal in dB. The output is buffered with a
low output impedance driver. The LT5534 delivers superior
temperature stability (typical output variation within ±1dB
over the full temperature range). The output responds in
less than 40ns to a large RF input signal.
FEATURES
APPLICATIONS
n RF Frequency Range: 50MHz to 3GHz
n Linear Dynamic Range: 60dB
n Exceptional Accuracy over Temperature
and Power Supply
n Fast Transient Response:
38ns Full-Scale Settling Time
n Single 2.7V to 5.25V Supply
n Low Supply Current: 7mA
n Shutdown Current: 0.1µA
n Tiny 6-Lead SC70 Package
n RF RSSI and ACC
n RF Power Control
n CATV Power Detection
n Optical Receiver Gain Control
50MHz to 3GHz RF Power Detector Output Voltage
vs RF Input Power
DETDETDETDETDET
RF
1nF
EN
47Ω
ENABLE
RF
INPUT
VOUT
VCC
GND
100pF
3V
LT5534
0.1µF
VOUT
5534 TA01
RF INPUT POWER (dBm)
–60
0
V
OUT
(V)
LINEARITY ERROR (dB)
0.4
0.8
1.2
1.6
2.4
–50 –40 –30 –20
5534 TA01b
–10 0
2.0
–3
–2
–1
0
1
3
2
TA = 25°C
TA = 85°C
TA = –40°C
VCC = 3V
AT 900MHz
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT5534 :I :I :I sue PACKAGE (HEAD PLAST‘C 3070 NW L7 LINE/“2 v toerch
LT5534
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ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ..............................................5.5V
Enable Voltage .....................................................0V, VCC
RF Voltage (+10dBm Equivalent) ..............................±1V
Operating Ambient Temperature Range ...–40°C to 85°C
Storage Temperature Range ...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
ELECTRICAL CHARACTERISTICS
VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
RF Input
Frequency Range 50 to 3000 MHz
Input Impedance 2 kΩ
fRF = 50MHz
RF Input Power Range –58 to +2 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB
Output Slope 44 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.007 dB/°C
fRF = 900MHz
RF Input Power Range –60 to 0 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB
Output Slope 41 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.008 dB/°C
fRF = 1900MHz
RF Input Power Range –63 to –2 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 61 dB
Output Slope 31 36.6 43 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.012 dB/°C
Output Intercept 50Ω External Termination, TA = –40°C to 85°C –70 –64 –58 dBm
fRF = 2500MHz
RF Input Power Range –63 to –3 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB
PIN CONFIGURATION
EN 1
GND 2
VOUT 3
6 RF
5 GND
4 VCC
TOP VIEW
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 256°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT5534ESC6#PBF LT5534ESC6#TRPBF LBGD 6-Lead Plastic SC70 –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LT5534 Cami? Snow 3! / 28 3: > L7 LJUW
LT5534
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ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Specifications over the –40°C to 85°C temperature range are assured
by design, characterization and correlation with statistical process control.
VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Up/Down
Turn-On Time 200 ns
Turn-Off Time 800 ns
EN = High (On) 0.9 V
EN = Low (Off) 0.6 V
Power Supply
Supply Voltage 2.7 5.25 V
Supply Current EN = High 5 7 9 mA
Shutdown Current EN = Low 0.1 10 µA
Note 3: The linearity error is calculated by the difference between the
incremental slope of the output and the average output slope from
–48dBm to –14dBm. The dynamic range is defined as the range over
which the linearity error is within ±3dB.
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Frequency Linearity Error vs Frequency Output Voltage vs RF Input Power
(Test circuit shown in Figure 1)
RF INPUT POWER (dBm)
–70
1.6
2.0
2.8
–40 –20
5534 G01
1.2
0.8
–60 –50 –30 –10 0
0.4
0
2.4
V
OUT
(V)
VCC = 3V
TA = 25°C
50MHz 1.9GHz
2.5GHz
900MHz
RF INPUT POWER (dBm)
–70
LINEARITY ERROR (dB)
1
2
3
–40 –20
5534 G02
0
–1
–60 –50 –30 –10 0
–2
–3
50MHz VCC = 3V
TA = 25°C
900MHz
1.9GHz
2.5GHz
RF INPUT POWER (dBm)
–60
0
V
OUT
(V)
LINEARITY ERROR (dB)
0.4
0.8
1.2
1.6
2.4
–50 –40 –30 –20
5534 G03
–10 0
2.0
–3
–2
–1
0
1
3
2
TA = 25°C
TA = 85°C
TA = –40°C
VCC = 3V
AT 50MHz
TYPICAL PERFORMANCE CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Slope 35 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.025 dB/°C
Output Interface
Output DC Voltage No RF Input Signal 0 142 380 mV
Output Impedance 32 Ω
Output Bandwidth 30 MHz
Full-Scale Setting Time Input from No Signal to –2dBm, to 90% 38 ns
Sinking/Sourcing 10/200 mA/µA
VCC = 3V, EN = 3V, TA = 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
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LT5534
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TYPICAL PERFORMANCE CHARACTERISTICS
VOUT Variation vs RF Input Power Output Voltage vs RF Input Power
VOUT Variation vs RF Input Power
(Test circuit shown in Figure 1)
RF INPUT POWER (dBm)
–60
–3
V
OUT
VARIATION (dB)
–2
–1
0
1
3
–50 –40 –30 –20
5534 G04
–10 0
2
TA = –40°C
TA = 85°C
VCC = 3V AT 50MHz
NORMALIZED AT 25°C
RF INPUT POWER (dBm)
–60
0
V
OUT
(V)
LINEARITY ERROR (dB)
0.4
0.8
1.2
1.6
2.4
–50 –40 –30 –20
5534 G05
–10 0
2.0
–3
–2
–1
0
1
3
2
TA = 25°C
TA = 85°C
TA = –40°C
VCC = 3V
AT 900MHz
RF INPUT POWER (dBm)
–60
–3
V
OUT
VARIATION (dB)
–2
–1
0
1
3
–50 –40 –30 –20
5534 G06
–10 0
2
TA = –40°C
TA = 85°C
VCC = 3V AT 900MHz
NORMALIZED AT 25°C
Output Voltage vs RF Input Power
VOUT Variation vs RF Input Power Output Voltage vs RF Input Power
RF INPUT POWER (dBm)
–60
0
V
OUT
(V)
LINEARITY ERROR (dB)
0.4
0.8
1.2
1.6
2.4
–50 –40 –30 –20
5534 G07
–10 0
2.0
–3
–2
–1
0
1
3
2
TA = 25°C
TA = 85°C
TA = –40°C
VCC = 3V
AT 1.9GHz
RF INPUT POWER (dBm)
–60
–3
V
OUT
VARIATION (dB)
–2
–1
0
1
3
–50 –40 –30 –20
5534 G08
–10 0
2
TA = –40°C
TA = 85°C
VCC = 3V AT 1.9GHz
NORMALIZED AT 25°C
RF INPUT POWER (dBm)
–60
0
V
OUT
(V)
LINEARITY ERROR (dB)
0.4
0.8
1.2
1.6
2.4
–50 –40 –30 –20
5534 G09
–10 0
2.0
–3
–2
–1
0
1
3
2
TA = 25°C
TA = 85°C
TA = –40°C
VCC = 3V
AT 2.5GHz
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LT5534
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TYPICAL PERFORMANCE CHARACTERISTICS
VOUT Variation vs RF Input Power
Output Voltage vs RF Input Power
at VCC = 3V and 5V
Output Voltage Distribution
vs Temperature
Output Voltage Distribution
vs Temperature Supply Voltage vs Supply Current
(Test circuit shown in Figure 1)
RF INPUT POWER (dBm)
–60
–3
V
OUT
VARIATION (dB)
–2
–1
0
1
3
–50 –40 –30 –20
5534 G10
–10 0
2
TA = –40°C
TA = 85°C
VCC = 3V AT 2.5GHz
NORMALIZED AT 25°C
RF INPUT POWER (dBm)
–60
1.6
2.0
2.8
–40 –20
5534 G11
1.2
0.8
–50 –30 –10 0
0.4
0
2.4
V
OUT
(V)
TA = 25°C
50MHz
VCC = 3V, 5V
1.9GHz
VCC = 3V, 5V
VOUT (V)
0
PERCENTAGE DISTRIBUTION (%)
5
15
20
25
35
0.54 0.62 0.66
5534 G12
10
30
0.6 0.7
0.56 0.58 0.64 0.68
RF PIN = –48dBm AT 1.9GHz
VCC = 3V
TA = 25°C
TA = –40°C
TA = 85°C
VOUT (V)
0
PERCENTAGE DISTRIBUTION (%)
5
15
20
25
40
35
1.79 1.87 1.91
5534 G13
10
30
1.85
1.81 1.83 1.89 1.93
TA = 25°C
TA = –40°C
TA = 85°C
RF PIN = –14dBm AT 1.9GHz
VCC = 3V
SUPPLY VOLTAGE (V)
2.5
4
SUPPLY CURRENT (mA)
5
6
7
8
10
33.5 4 4.5
5530 G14
5 5.5
9
TA = 85°C
TA = 25°C
TA = –40°C
RF Input Return Loss vs Frequency Output Transient Response
RF INPUT FREQUENCY (GHz)
0
–30
RETURN LOSS (dB)
–25
–20
–15
–10
0
0.5 1 1.5 2
5534 G15
2.5 3
–5
50ns/DIV
1V/DIV
5534 G16
RF
INPUT
PULSED RF
0dBm AT 100MHz
VOUT
LT5534 _. _‘ _ _ HP ”1 «H I— i H I— 6 L7LJ1‘JW
LT5534
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PIN FUNCTIONS
BLOCK DIAGRAM
EN (Pin 1): Enable. When the input voltage is higher than
0.9V, the circuit is completely turned on. When the input
voltage is less than 0.6V, the circuit is turned off.
GND (Pins 2, 5): Ground.
VOUT (Pin 3): RF Detector Output.
VCC (Pin 4): Power Supply. This pin should be decoupled
using 100pF and 0.1µF capacitors.
RF (Pin 6): RF Input. This pin is internally biased to
VCC – 0.18V. A coupling capacitor must be used to connect
to the RF signal source.
EN
VREF
VOUT
5534 BD
VCC
OFFSET
COMP
DETDET
BIAS
RF LIMITER
DETDETDET
RF
GND
6
2 5 1
4
3
RF LIMITERRF LIMITERRF LIMITER +
–
Figure 1. Evaluation Circuit Schematic
EN
GND
VOUT
RF
GND
VCC
1
2
3
6
5
4
LT5534
R2
0Ω
OPTIONAL
VOUT
EN
C5
OPTIONAL
C3
100pF
C1
1nF
VCC
5534 F01
J1
RF
C2
0.1µF
R1
47Ω
OPTIONAL
REF DES
C1
C2
C3
C5
R1
R2
VALUE
1nF
0.1µF
100pF
47Ω
0Ω
SIZE
0402
0603
0603
0603
0402
0603
PART NUMBER
AVX 04025C102JAT2A
TAIYO YUDEN TMK107BJ104KA
AVX 06035C101KAT2A
OPTIONAL
OPTIONAL
OPTIONAL
TEST CIRCUIT
.nnuuuooa DC748A g LT5534ESCG a RF Power Detector W/GOdB Range L7 LJUW 7
LT5534
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TEST CIRCUIT
APPLICATIONS INFORMATION
Figure 2. Component Side Silkscreen of Evaluation Board Figure 3. Component Side Layout of Evaluation Board
The LT5534 is a logarithmic-based detector, capable of
measuring an RF signal over the frequency range from
50MHz to 3GHz. The 60dB linear dynamic range is
achieved with very stable output over the full temperature
range from –40°C to 85°C. The absolute variation over
temperature is typically within ±1dB over a 47dB dynamic
range at 1.9GHz.
RF Input Port
The RF port is internally biased at VCC-0.18V. The pin
should be DC blocked when connected to ground or other
matching components. A 47Ω resistor (R1) connected to
ground will provide better than 10dB input return loss up
to 2.5GHz. An additional 2nH inductance in series with
R1 will provide improved input matching up to 3GHz.
The impedance vs frequency of the RF input is detailed
in Table 1.
The approximate linear RF input power range of the LT5534
is from –62dBm to –2dBm with a 50Ω source impedance.
However, this range can be adjusted either upward or
Table 1. RF Input Impedance
FREQUENCY
(MHz)
INPUT
IMPEDANCE (Ω)
S11
MAG ANGLE (DEG)
50 1429-j429 0.938 –1.1
100 947-j710 0.934 –2.9
200 509-j609 0.922 –5.6
400 250-j440 0.908 –9.9
600 149-j344 0.900 –14.1
800 96.8-j278 0.896 –18.3
1000 67.6-j229 0.893 –22.7
1200 49.7-j193 0.889 –27.3
1400 38.4-j165 0.883 –32.3
1600 30.8-j143 0.879 –37.3
1800 25.4-j125 0.873 –42.6
2000 21.4-j109 0.866 –48.0
2200 18.5-j96.2 0.862 –53.6
2400 16.6-j85.0 0.848 –59.6
2600 15.2-j75.7 0.834 –65.6
2800 13.7-j67.5 0.826 –71.8
3000 12.1-j60.1 0.822 –78.2
LT5534 8 L7LJ1‘JW
LT5534
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downward to tailor for a particular application need. By
simply inserting an attenuator in front of the RF input, the
power range is shifted higher by the amount of the attenu-
ation. Moreover, due to the high RF input impedance of
the LT5534, the detecting range can be moved downward
for better detection sensitivity by using a narrow band
L-C matching network. By this means, the sensitivity of
the detector can be extended to as low as –75dBm. By
changing the value of resistor R1, the sensitivity of the
detector can be fine-tuned within the range from –75dBm
to –62dBm. Though the range is adjustable, the overall
linear dynamic range remains the same.
Output Interface
The output interface of the LT5534 is shown in Figure 4.
The output currents from the RF detectors are summed
and converted into an output voltage, VOUT. The maximum
charging current available to the output load is about
200µA. The internal compensation capacitor CC is used
to guarantee stable operation for a large capacitive output
load. The slew rate is 133V/µs, and the small-signal output
bandwidth is approximately 30MHz when the output is
resistively terminated or open. The fastest output transient
response is achieved when a large signal is applied to the
RF input port. See the Output Transient Response plot in
the Typical Performance Characteristics section.
When the output is terminated with a load capacitance
CL, the slew rate is then limited to 200µA/(CL + 1.5pF).
For example, the slew rate is reduced to 17.4V/µs when
CL = 10pF. A capacitive load may result in output voltage
overshoot, which can be minimized with a series compen-
sation resistor R2, as shown in Figure 1. The suggested
resistor values for various capacitive loads are listed in
Table 2.
Table 2. Resistor Value for Capacitive Output
C5 (pF) R2 (kΩ)
1.5 5
5 4
10 2.5
20 2
The optional RC network at the output (R2 and C5 on the
demo board) can also provide further output filtering, if
needed. The output bandwidth is primarily dictated by the
RC constant of this lowpass filter when its corner frequency
is less than 30MHz.
When a large signal (e.g., –2dBm) is present at the RF
input port, the output voltage swing can be as high as
2.4V. To assure proper operation of the chip, the minimum
resistive load at the output termination should be greater
than 18kΩ.
Figure 4. Simplified Circuit Schematic
of the Output Interface
–
+
VOUT
5534 F04
200µA
V
CC
CC
+
OUTPUT CURRENTS
FROM RF DETECTORS
APPLICATIONS INFORMATION
LT5534 L7 LJUW 9
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
B 8/10 Revised Output DC Voltage minimum and maximum values in Electrical Characteristics section 3
Updated package drawing in Package Description section 10
C 12/10 Corrected part numbers in Order Information 2
(Revision history begins at Rev B)
LT5534
LT5534
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5534fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2004
LT 1210 REV C • PRINTED IN USA
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SC6 SC70 1205 REV B
1.80 – 2.20
(NOTE 4)
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PIN 1
0.80 – 1.00
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REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
8. JEDEC PACKAGE REFERENCE IS MO-203 VARIATION AB
2.8 BSC
0.47
MAX
0.65
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.8 REF
1.00 REF
INDEX AREA
(NOTE 6)
0.10 – 0.18
(NOTE 3)
0.26 – 0.46
GAUGE PLANE
0.15 BSC
0.10 – 0.40
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638 Rev B)