MAX2634 Datasheet

+Denoxes a Iead(Pb)rIree/ROHSrcomp/Ia"I package.
Functional Diagram/Typical Operating Circuit appears at
end of data sheet.
General Description
The MAX2634 low-noise amplifier (LNA) with low-power
shutdown mode is optimized for 315MHz and 433.92MHz
automotive remote keyless entry (RKE) applications. At
315MHz, the LNA achieves 15.5dB power gain and a
1.25dB noise figure while only consuming 2.5mA of
supply current from a 2.2V to 5.5V power supply. An
integrated logic-controlled low-power shutdown mode
reduces power consumption to 0.1µA and replaces the
two transistors typically required to implement the shut-
down function in discrete-based RKE LNA solutions. The
device further reduces component count by integrating
the output matching and DC-blocking components, and
only requires a single inductor to match the input for best
noise figure and input return loss.
The device is available in a small 6-pin (2.0mm x 2.2mm
x 0.9mm) lead-free SC70 package for automotive appli-
cations that require visual inspection of PCB solder con-
nections.
Applications
●Remote Keyless Entry (RKE)
●Tire Pressure Monitoring Systems (TPMS)
●Security
●Garage Door Openers
●Telemetry Receivers
Features
●Optimized for 308MHz, 315MHz, 418MHz,
and 433.92MHz
●2.2V to 5.5V Supply Voltage Range
●Low Operating Supply Current
2.5mA (typ), 4mA (max)
●Logic-Controlled 1µA (max) Shutdown
●Typical Performance at 315MHz
1.25dB Noise Figure
-16dBm Input IP3
15.5dB Power Gain
●Automotive Temperature Range
-40°C to +125°C
●ESD Rating of ±2.0kV (HBM) on All Pins
●AEC-Q100 Qualification
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V Denotes an automotive qualified part.
FREQUENCY
(MHz)
L1
(nH)
SUPPLY
CURRENT
(mA)
GAIN
(dB)
NOISE FIGURE
(dB)
INPUT P1dB
(dBm)
INPUT IP3
(dBm)
308 56 2.5 15.5 1.25 -29 -16
315 56 2.5 15.5 1.25 -29 -16
418 33 2.5 13.5 1.25 -26 -12
433.92 33 2.5 13.5 1.25 -26 -12
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX2634AXT+ -40°C to +125°C 6 SC70 +ADG
MAX2634AXT/V+ -40°C to +125°C 6 SC70 +ADG
SC70
TOP VIEW
MAX2634
GND
1
2
SHDN
GND
3RFIN
6
5
RFOUT
VCC
4
+
MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
19-4383; Rev 3; 11/15
Performance Table
Pin Configuration
Ordering Information
EVALUATION KIT AVAILABLE
VCC Pin to GND ...................................................-0.3V to +6.0V
RFIN ................Pin Must Be AC-Coupled with DC-Blocking Cap
RFOUT, SHDN ......................................... -0.3V to (VCC + 0.3V)
RF Input Power ................................................................+5dBm
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) .............245mW
Junction-to-Case Thermal Resistance (θJC)
(Note 1) ......................................................................115°C/W
Junction-to-Ambient Thermal Resistance (θJA)
(Note 1) ......................................................................326°C/W
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s) ................................... 300°C
(VCC = +2.2V to +5.5V, TA = -40°C to +125°C, Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted. RFIN and
RFOUT are AC-coupled and terminated to 50Ω. No RF input signals at RFIN and RFOUT.) (Note 2)
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage 2.2 5.5 V
Operating Supply Current
SHDN = high, TA = +25°C 2.5 4 mA
SHDN = high, TA = -40°C to +125°C 6 mA
Shutdown Supply Current VSHDN = 0, TA = +25°C 1 µA
VSHDN = 0, TA = -40°C to +125°C 10 µA
DIGITAL CONTROL INPUTS (SHDN)
Digital Input-Voltage High 1.1 V
Digital Input-Voltage Low 0.4 V
Digital Input-Current High VSHDN = VIH 5 µA
Digital Input-Current Low VSHDN = VIL 1 µA
SHUTDOWN MODE CONTROL
Enable Time 130 µs
Disable Time 20 µs
CAUTION! ESD SENSITIVE DEVICE
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
DC Electrical Characteristics
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Absolute Maximum Ratings
Note 2: Guaranteed by productwon tes‘ at TA : +25°c Guaranteed by design and characlenzauon atTA : 740°C and TA = +125°c
(MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise
noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.)
Note 2: Guaranteed by production test at TA = +25°C. Guaranteed by design and characterization at TA = -40°C and TA = +125°C.
Note 3: Measured with two tones located at 315MHz and 316MHz or 433MHz and 434MHz at -40dBm/tone.
Note 4: Guaranteed by design and characterization.
(MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise
noted. PRFIN = -40dBm, SHDN = high.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
fRFIN = 315MHz
Power Gain TA = +25°C 12.5 15.5 dB
TA = -40°C to +125°C, VCC = +3.0V 11.5
Noise Figure TA = +25°C 1.25 dB
Input Third-Order Intercept Point (Note 3) -16 dBm
Input 1dB Compression Point -29 dBm
Input Return Loss 10 dB
Output Return Loss 8 dB
Reverse Isolation 60 dB
fRFIN = 433.92MHz
Power Gain TA = +25°C (Note 4) 11 13.5 dB
TA = -40°C to +125°C, VCC = +3.0V (Note 4) 10
Noise Figure TA = +25°C 1.25 dB
Input Third-Order Intercept Point (Note 3) -12 dBm
Input 1dB Compression Point -26 dBm
Input Return Loss 11 dB
Output Return Loss 8 dB
Reverse Isolation 60 dB
S11, S22, S21 vs. FREQUENCY
(433MHz)
FREQUENCY (MHz)
S11, S22, S21 (dB)
MAX2634 toc03
200 300 400 500 600
-20
-15
-10
-5
0
5
10
15
20
S11
S22
S21
S11, S22, S21 vs. FREQUENCY
(315MHz)
FREQUENCY (MHz)
S11, S22, S21 (dB)
MAX2634 toc02
200 300 400 500 600
-20
-15
-10
-5
0
5
10
15
20
S22
S21 S11
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX2634 toc01
2.2 3.3 4.4 5.5
1.5
2.0
2.5
3.0
3.5
4.0
TA = -40°C
TA = +25°C
TA = +125°C
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Typical Operating Characteristics
AC Electrical Characteristics
(MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise
noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.)
-120
-100
-110
-80
-90
-60
-70
-50
-30
-40
-20
0 10 15 205 25 30 35 4540 50
SHUTDOWN TIME
MAX2634 toc11
TIME (µs)
OUTPUT POWER (dBm)
1AVG
fRFIN = 315MHz
PRFIN = -43dBm
-120
-100
-110
-80
-90
-60
-70
-50
-30
-40
-20
0 40 60 8020 100 120 140 180160 200
TURN-ON TIME
MAX2634 toc10
TIME (µs)
OUTPUT POWER (dBm)
1AVG
fRFIN = 315MHz
PRFIN = -43dBm
GAIN vs. SUPPLY VOLTAGE
(315MHz)
SUPPLY VOLTAGE (V)
GAIN (dB)
MAX2634 toc09
23456
11
12
13
14
15
16
17
TA = +25°C
TA = +125°C
TA = -40°C
GAIN vs. SUPPLY VOLTAGE
(433MHz)
SUPPLY VOLTAGE (V)
GAIN (dB)
MAX2634 toc08
23456
11
12
13
14
15
16
17
TA = +25°C
TA = +125°C
TA = -40°C
NOISE FIGURE vs. SUPPLY VOLTAGE
(315MHz)
SUPPLY VOLTAGE (V)
NOISE FIGURE (dB)
MAX2634 toc07
23456
0
0.5
1.0
1.5
2.0
2.5
TA = +25°C
TA = -40°C
TA = +125°C
NOISE FIGURE vs. SUPPLY VOLTAGE
(433MHz)
SUPPLY VOLTAGE (V)
NOISE FIGURE (dB)
MAX2634 toc06
23456
0
0.5
1.0
1.5
2.0
2.5
TA = +25°C
TA = -40°C
TA = +125°C
IIP3 vs. SUPPLY VOLTAGE
(433MHz)
SUPPLY VOLTAGE (V)
IIP3 (dBm)
MAX2634 toc05
23456
-20
-17
-14
-11
-8
-5
TA = +25°C
TA = +40°C
TA = +125°C
IIP3 vs. SUPPLY VOLTAGE
(315MHz)
SUPPLY VOLTAGE (V)
IIP3 (dBm)
MAX2634 toc04
23456
-20
-18
-16
-14
-12
-10
TA = +25°C
TA = -40°C
TA = +125°C
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Typical Operating Characteristics (continued)
Detailed Description
The MAX2634 LNA with low-power shutdown mode is
optimized for 308MHz, 315MHz, 418MHz, and 433MHz
automotive RKE applications, which are required to
operate over the -40°C to +125°C automotive tempera-
ture range. The device reduces component count by
integrating the output matching and DC-blocking com-
ponents, and only requires a single inductor to match
the input for best noise figure and input return loss. An
integrated logic-controlled low-power shutdown mode
reduces power consumption to 0.1µA and replaces the
two transistors typically required to implement the shut-
down function in discrete-based RKE LNA solutions.
Input Matching
The MAX2634 requires an off-chip input matching net-
work. The Functional Diagram/Typical Operating Circuit
shows the recommended input-matching network com-
ponent values for operation at 315MHz and 433MHz.
These values are optimized for the best simultaneous
gain, noise figure, and return loss performance. Table 1
lists typical input and output impedances.
Table 1. Typical Input and Output Impedances in R+jX Format
(VCC = +3.0V, TA = +25°C.)
FREQUENCY (MHz) INPUT IMPEDANCE OUTPUT IMPEDANCE
R X R X
100 58 -438 92 -94
200 43 -216 92.1 -50
308 29 -139 91.2 -35.8
315 29.4 -137 91 -35
418 29.2 -101 90.5 -30
434 28.5 -96 89.5 -29.3
500 26.4 -83 91 -28.2
600 26.7 -69 87.5 -27.3
PIN NAME FUNCTION
1, 3 GND Ground. Use minimum path to ground plane to minimize inductance.
2SHDN Shutdown Input. A logic-level high enables the LNA, and a logic-level low disables the LNA.
4 RFIN
RF Input. Requires an inductor to match the input for best noise figure and return loss. A DC-blocking
capacitor is required if the RFIN input will see a DC voltage or ground. See the Functional Diagram/
Typical Operating Circuit.
5 V
CC Supply Voltage. Bypass to ground with a 0.01µF capacitor as close as possible to the pin.
6 RFOUT RF Output. Internally matched to 50Ω and incorporates an internal DC-blocking capacitor.
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Pin Description
Table 3. RF Input Coupling Input IP3 vs. Enable Time
RF Input Coupling Capacitor
Input IP3 vs. Enable Time
The value of the coupling capacitor affects input IP3 and
turn-on time. A larger coupling capacitor results in higher
input IP3 at the expense of longer turn-on time. See Table
3 for the typical amount of trade-off.
Integrated Output Matching
Network and DC-Block
The MAX2634 integrates the output matching network
and DC-block, eliminating the need for external matching
components while providing a broadband match. See the
Functional Diagram/Typical Operating Circuit for compo-
nent values.
Shutdown
The MAX2634 features a shutdown pin to disable the
entire chip. Apply a logic-high to the SHDN pin to place
the part in the active mode, and a logic-low to place the
part in the shutdown mode.
Power-Supply Bypassing
Bypassing the VCC line is necessary for optimum gain/
linearity performance. See the Functional Diagram/Typical
Operating Circuit for bypassing capacitor values.
Layout Information
A properly designed PCB is essential to any RF/
microwave circuit. Use controlled-impedance lines on all
high-frequency inputs and outputs. Bypass with decou-
pling capacitors located close to the device’s VCC pin.
For long VCC lines, it may be necessary to add additional
decoupling capacitors. These additional capacitors can
be located farther away from the device package. Proper
grounding of the GND pins is essential. If the PCB uses a
topside RF ground, connect it directly to all GND pins. For
a board where the ground plane is not on the component
layer, the best technique is to connect the GND pins to
the board with a plated through-hole located close to the
package.
Table 3. RF Input Coupling Capacitor
Input IP3 vs. Enable Time
Table 2. MAX2634 Typical Noise
Parameters
(VCC = +3.0V, TA = +25°C.)
INPUT DC-BLOCKING
CAPACITOR,
C1 (
ENABLE
TIME
(µs)
INPUT IP3 AT
315MHz
(dBm)
1 6 -19
3.3 20 -14
22 130 -12
100 600 -11
1000 6000 -11
FREQUENCY
(MHz)
FMIN
(dB) |GOPT||GOPT|
ANGLE RN (Ω)
308 0.64 0.50 27.0 9.78
315 0.65 0.49 27.7 9.78
418 0.78 0.44 37.4 9.87
434 0.80 0.44 38.9 9.88
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Chip Information
PROCESS: SiGe BiCMOS
mm J: D Vcc m f l L 1 1 2" GM) Wk
PACKAGE TYPE PACKAGE CODE OUTLINE NO.
LAND
PATTERN NO.
6 SC70 X6SN+1
21-0077 90-0189
MAX2634
C3
100pF
C1**
22nF
L1*
6
5
4
1
2
3
C2
0.01F
RFOUT RF
OUTPUT
RF
INTPUT
*L1 = 56nH FOR 308MHz/315MHz.
*L1 = 33nH FOR 418MHz/433.92MHz.
**C1 = DC-BLOCK. OPTIONAL IF DC IS NOT APPLIED TO RFIN.
VCC
VCC
RFIN
GND
+
SHDN
LOGIC
CONTROL
GND
BIAS
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Functional Diagram/Typical Operating Circuit
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/08 Initial release —
1 3/09 Updated the Features, Performance Table, Electrical Characteristics, and
Typical Operating Characteristics sections. 1, 3, 4
2 2/14 Added automotive grade package to Ordering Information 1
3 11/15 Updated package code in Package Information section 7
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc.
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MAX2634 315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.