MAX2634EVKIT+ Maxim Integrated Products, MAX2634EVKIT+ Datasheet - Page 5

• Manufacturer Part Number: MAX2634EVKIT+
• Description: RF Modules & Development Tools KIT EVAL FOR MAX2634 AUTO AMP
• Manufacturer: Maxim Integrated Products

Specifications of MAX2634EVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Table 1. Typical Input and Output Impedances in R+jX Format
(V
CC
FREQUENCY (MHz)
PIN
1, 3
= +3.0V, T
2
4
5
6
100
200
308
315
418
434
500
600
A
RFOUT
NAME
GND
RFIN
= +25°C.)
V
CC
_______________________________________________________________________________________
Detailed Description
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 50 and incorporates an internal DC-blocking capacitor.
29.4
29.2
28.5
26.4
26.7
58
43
29
R
INPUT IMPEDANCE
Amplifier for Automotive RKE
315MHz/433MHz Low-Noise
-438
-216
-139
-137
-101
-96
-83
-69
X
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.
FUNCTION
92.1
91.2
90.5
89.5
87.5
92
91
91
R
OUTPUT IMPEDANCE
Pin Description
Input Matching
-35.8
-29.3
-28.2
-27.3
-94
-50
-35
-30
X
5