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.maximintegrated.com/thermal-tutorial.
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.
CAUTION!
ESD SENSITIVE DEVICE
DC Electrical Characteristics
(V
CC
= +2.2V to +5.5V, T
A
= -40°C to +125°C, Typical values are at V
CC
= +3.0V, T
A
= +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)
PARAMETER
Operating Supply Voltage
Operating Supply Current
Shutdown Supply Current
SHDN
= high, T
A
= +25°C
SHDN
= high, T
A
= -40°C to +125°C
V
SHDN
= 0, T
A
= +25°C
V
SHDN
= 0, T
A
= -40°C to +125°C
1.1
0.4
V
SHDN
= V
IH
V
SHDN
= V
IL
130
20
5
1
CONDITIONS
MIN
2.2
2.5
TYP
MAX
5.5
4
6
1
10
UNITS
V
mA
mA
µA
µA
V
V
µA
µA
µs
µs
DIGITAL CONTROL INPUTS (SHDN)
Digital Input-Voltage High
Digital Input-Voltage Low
Digital Input-Current High
Digital Input-Current Low
SHUTDOWN MODE CONTROL
Enable Time
Disable Time
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Maxim Integrated
│
2
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
AC Electrical Characteristics
(MAX2634 EV Kit, V
CC
= +2.2V to +5.5V, T
A
= -40°C to +125°C. Typical values are at V
CC
= +3.0V and T
A
= +25°C, unless otherwise
noted. P
RFIN
= -40dBm,
SHDN
= high.) (Note 2)
PARAMETER
f
RFIN
= 315MHz
Power Gain
Noise Figure
Input Third-Order Intercept Point
Input 1dB Compression Point
Input Return Loss
Output Return Loss
Reverse Isolation
f
RFIN
= 433.92MHz
Power Gain
Noise Figure
Input Third-Order Intercept Point
Input 1dB Compression Point
Input Return Loss
Output Return Loss
Reverse Isolation
T
A
= +25°C (Note 4)
T
A
= -40°C to +125°C, V
CC
= +3.0V (Note 4)
T
A
= +25°C
(Note 3)
11
10
1.25
-12
-26
11
8
60
13.5
dB
dB
dBm
dBm
dB
dB
dB
T
A
= +25°C
T
A
= -40°C to +125°C, V
CC
= +3.0V
T
A
= +25°C
(Note 3)
12.5
11.5
1.25
-16
-29
10
8
60
15.5
dB
dB
dBm
dBm
dB
dB
dB
CONDITIONS
MIN
TYP
MAX
UNITS
Note 2:
Guaranteed by production test at T
A
= +25°C. Guaranteed by design and characterization at T
A
= -40°C and T
A
= +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, V
CC
= +2.2V to +5.5V, T
A
= -40°C to +125°C. Typical values are at V
CC
= +3.0V and T
A
= +25°C, unless otherwise
noted. f
RFIN
= 315MHz/433MHz, P
RFIN
= -40dBm,
SHDN
= high.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
T
A
= +125°C
MAX2634 toc01
15
10
S11, S22, S21 (dB)
5
0
-5
-10
S21
S11
15
10
S11, S22, S21 (dB)
5
0
-5
-10
S21
S11
SUPPLY CURRENT (mA)
3.5
3.0
2.5
2.0
1.5
T
A
= -40°C
2.2
3.3
4.4
SUPPLY VOLTAGE (V)
T
A
= +25°C
-15
5.5
-20
200
300
S22
400
500
FREQUENCY (MHz)
600
-15
-20
200
300
S22
400
500
FREQUENCY (MHz)
600
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Maxim Integrated
│
3
MAX2634 toc03
MAX2634 toc02
4.0
20
S11, S22, S21 vs. FREQUENCY
(315MHz)
20
S11, S22, S21 vs. FREQUENCY
(433MHz)
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Typical Operating Characteristics (continued)
(MAX2634 EV Kit, V
CC
= +2.2V to +5.5V, T
A
= -40°C to +125°C. Typical values are at V
CC
= +3.0V and T
A
= +25°C, unless otherwise
noted. f
RFIN
= 315MHz/433MHz, P
RFIN
= -40dBm,
SHDN
= high.)
MAX2634 toc05
MAX2634 toc04
T
A
= +125°C
-12
-14
-16
-18
-20
T
A
= -40°C
T
A
= +25°C
T
A
= +125°C
T
A
= +125°C
2.0
NOISE FIGURE (dB)
1.5
1.0
0.5
0
T
A
= +25°C
-8
-11
-14
-17
-20
T
A
= +25°C
IIP3 (dBm)
IIP3 (dBm)
T
A
= +40°C
2
3
4
5
SUPPLY VOLTAGE (V)
6
T
A
= -40°C
2
3
4
5
SUPPLY VOLTAGE (V)
6
2
3
4
5
SUPPLY VOLTAGE (V)
6
NOISE FIGURE vs. SUPPLY VOLTAGE
(315MHz)
MAX2634 toc07
MAX2634 toc08
T
A
= +125°C
T
A
= -40°C
2.0
NOISE FIGURE (dB)
T
A
= +25°C
1.5
1.0
0.5
0
16
15
GAIN (dB)
14
13
T
A
= +25°C
T
A
= -40°C
16
15
GAIN (dB)
14
13
T
A
= +25°C
T
A
= +125°C
T
A
= -40°C
2
3
4
5
SUPPLY VOLTAGE (V)
6
12
11
T
A
= +125°C
12
11
2
3
4
5
SUPPLY VOLTAGE (V)
6
2
3
4
5
SUPPLY VOLTAGE (V)
6
MAX2634 toc10
-30
-40
OUTPUT POWER (dBm)
-50
-60
-70
-80
-90
-100
-110
-120
0
OUTPUT POWER (dBm)
f
RFIN
= 315MHz
P
RFIN
= -43dBm
1AVG
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
f
RFIN
= 315MHz
P
RFIN
= -43dBm
1AVG
20 40 60 80 100 120 140 160 180 200
TIME (
µ
s)
0
5
10 15 20 25 30 35 40 45 50
TIME (
µ
s)
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Maxim Integrated
│
4
MAX2634 toc11
-20
TURN-ON TIME
-20
SHUTDOWN TIME
MAX2634 toc09
2.5
17
GAIN vs. SUPPLY VOLTAGE
(433MHz)
17
GAIN vs. SUPPLY VOLTAGE
(315MHz)
MAX2634 toc06
-10
IIP3 vs. SUPPLY VOLTAGE
(315MHz)
-5
IIP3 vs. SUPPLY VOLTAGE
(433MHz)
2.5
NOISE FIGURE vs. SUPPLY VOLTAGE
(433MHz)
MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Pin Description
PIN
1, 3
2
4
5
6
NAME
GND
SHDN
RFIN
V
CC
RFOUT
FUNCTION
Ground. Use minimum path to ground plane to minimize inductance.
Shutdown Input. A logic-level high enables the LNA, and a logic-level low disables the LNA.
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.
Supply Voltage. Bypass to ground with a 0.01µF capacitor as close as possible to the pin.
RF Output. Internally matched to 50Ω and incorporates an internal DC-blocking capacitor.
Table 1. Typical Input and Output Impedances in R+jX Format
(V
CC
= +3.0V, T
A
= +25°C.)
FREQUENCY (MHz)
100
200
308
315
418
434
500
600
INPUT IMPEDANCE
R
58
43
29
29.4
29.2
28.5
26.4
26.7
X
-438
-216
-139
-137
-101
-96
-83
-69
R
92
92.1
91.2
91
90.5
89.5
91
87.5
OUTPUT IMPEDANCE
X
-94
-50
-35.8
-35
-30
-29.3
-28.2
-27.3
Detailed Description
Input Matching
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
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