MAXIM MAX2634 Technical data
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 shutdown function in discrete-based
RKE LNA solutions. The device further reduces component count by integrating the output matching and DCblocking 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 applications that require visual inspection of PCB
solder connections.
Applications
Remote Keyless Entry (RKE)
Tire Pressure Monitoring Systems (TPMS)
Security
Garage Door Openers
Telemetry Receivers
Features
o Optimized for 308MHz, 315MHz, 418MHz,
and 433.92MHz
o 2.2V to 5.5V Supply Voltage Range
o Low Operating Supply Current
2.5mA (typ), 4mA (max)
o Logic-Controlled 1µA (max) Shutdown
o Typical Performance at 315MHz
1.25dB Noise Figure
-16dBm Input IP3
15.5dB Power Gain
o Automotive Temperature Range
-40°C to +125°C
o ESD Rating of ±2.5kV (HBM) on All Pins
o AEC-Q100 Qualification
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
Performance Table
19-4383; Rev 1; 3/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
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
Functional Diagram/Typical Operating Circuit appears at
end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
PART
TEMP RANGE
PIN-
TOP
MARK
6 SC70
+ADG
Ordering Information
PACKAGE
MAX2634AXT+ -40°C to +125°C
TOP VIEW
GND
SHDN
GND
+
1
2
MAX2634
3
6
RFOUT
5
V
CC
4
RFIN
SC70
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(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)
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.
VCCPin to GND.....................................................-0.3V to +6.0V
RFIN.................Pin Must Be AC-Coupled with DC-Blocking Cap
RFOUT, SHDN............................................-0.3V to (V
CC
+ 0.3V)
RF Input Power .................................................................+5dBm
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Junction-to-Case Thermal Resistance (θ
JC
)
(Note 1) ......................................................................115°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
)
(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
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.maxim-ic.com/thermal-tutorial
.
CAUTION! ESD SENSITIVE DEVICE
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage 2.2 5.5 V
Operating Supply Current
Shutdown Supply Current
DIGITAL CONTROL INPUTS (SHDN)
Digital Input-Voltage High 1.1 V
Digital Input-Voltage Low 0.4 V
Digital Input-Current High V
Digital Input-Current Low V
SHUTDOWN MODE CONTROL
Enable Time 130 µs
Disable Time 20 µs
SHDN = high, TA = +25°C 2.5 4 mA
SHDN = high, T
V
= 0, TA = +25°C1µA
SHDN
= 0, TA = -40°C to +125°C10µA
V
SHDN
= V
SHDN
= V
SHDN
= -40°C to +125°C6mA
A
IH
IL
5µA
1µA
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
_______________________________________________________________________________________ 3
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. P
RFIN
= -40dBm, SHDN = high.) (Note 2)
Note 2: Guaranteed by production test at T
A
= +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.
Typical Operating 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. f
RFIN
= 315MHz/433MHz, P
RFIN
= -40dBm, SHDN = high.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
f
= 315MHz
RFIN
Power Gain
TA = +25°C 12.5 15.5
= -40°C to +125°C, VCC = +3.0V 11.5
T
A
dB
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 8dB
Reverse Isolation 60 dB
f
= 433.92MHz
RFIN
Power Gain
TA = +25°C (Note 4) 11 13.5
= -40°C to +125°C, VCC = +3.0V (Note 4) 10
T
A
dB
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 8dB
Reverse Isolation 60 dB
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.0
3.5
3.0
2.5
SUPPLY CURRENT (mA)
2.0
1.5
2.2 3.3 4.4 5.5
TA = +125°C
TA = +25°C
TA = -40°C
SUPPLY VOLTAGE (V)
20
15
MAX2634 toc01
10
5
0
-5
S11, S22, S21 (dB)
-10
-15
-20
200 300 400 500 600
S11, S22, S21 vs. FREQUENCY
(315MHz)
S21
S11
S22
FREQUENCY (MHz)
MAX2634 toc02
S11, S22, S21 vs. FREQUENCY
(433MHz)
20
15
10
5
0
-5
S11, S22, S21 (dB)
-10
-15
-20
200 300 400 500 600
S21
S11
S22
FREQUENCY (MHz)
MAX2634 toc03
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