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MAX2634
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Pin Description
PIN
1, 3
2
4
5
NAME
GND
SHDN
RFIN
V CC
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.
6
RFOUT
RF Output. Internally matched to 50
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)
R
INPUT IMPEDANCE
X
R
OUTPUT IMPEDANCE
X
100
200
308
315
418
434
500
600
58
43
29
29.4
29.2
28.5
26.4
26.7
-438
-216
-139
-137
-101
-96
-83
-69
92
92.1
91.2
91
90.5
89.5
91
87.5
-94
-50
-35.8
-35
-30
-29.3
-28.2
-27.3
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.
Maxim Integrated
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.
5
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