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PDF MAX2634 Data sheet ( Hoja de datos )
| Número de pieza | MAX2634 | |
| Descripción | 315MHz/433MHz Low-Noise Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4383; Rev 1; 3/09
EVAALVUAAILTAIOBNLEKIT
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
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 con-
suming 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 compo-
nent 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 automo-
tive 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
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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
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX2634AXT+ -40°C to +125°C
6 SC70
+ADG
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
GND
SHDN
GND
+
1
2 MAX2634
3
6 RFOUT
5 VCC
4 RFIN
SC70
Functional Diagram/Typical Operating Circuit appears at
end of data sheet.
Performance Table
FREQUENCY
(MHz)
308
315
418
433.92
L1
(nH)
56
56
33
33
SUPPLY
CURRENT
(mA)
2.5
2.5
2.5
2.5
GAIN
(dB)
15.5
15.5
13.5
13.5
NOISE FIGURE
(dB)
1.25
1.25
1.25
1.25
INPUT P1dB
(dBm)
-29
-29
-26
-26
INPUT IP3
(dBm)
-16
-16
-12
-12
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
315MHz/433MHz Low-Noise
Amplifier for Automotive RKE
Pin Description
PIN NAME
FUNCTION
1, 3 GND Ground. Use minimum path to ground plane to minimize inductance.
2 SHDN 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
4 RFIN capacitor is required if the RFIN input will see a DC voltage or ground. See the Functional
Diagram/Typical Operating Circuit.
5 VCC 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
(VCC = +3.0V, TA = +25°C.)
FREQUENCY (MHz)
100
200
308
315
418
434
500
600
INPUT IMPEDANCE
RX
58 -438
43 -216
29 -139
29.4 -137
29.2 -101
28.5 -96
26.4 -83
26.7 -69
OUTPUT IMPEDANCE
RX
92 -94
92.1 -50
91.2 -35.8
91 -35
90.5 -30
89.5 -29.3
91 -28.2
87.5 -27.3
www.DataSheet4U.com
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.
_______________________________________________________________________________________ 5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX2634.PDF ] | |
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