MAX2402 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 800MHz to 1000MHz Transmitter

19-0392; Rev 1; 5/96
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800MHz to 1000MHz Transmitter
_______________General Description
The MAX2402 transmitter integrates a double-balanced
mixer, buffered local oscillator (LO) port, variable gain
stage, and power amplifier into a single IC. It is intend-
ed for use in the 800MHz to 1000MHz band, and is
compatible with both direct-sequence and frequency-
hopping spread-spectrum designs in the 902MHz to
928MHz ISM band.
In a typical application, a digital baseband signal is
mixed with a local oscillator signal to yield a BPSK-
modulated carrier at the antenna. Alternatively, the
baseband input may be grounded and an FSK-
modulated LO signal applied directly to the LO port.
The LO port consists of a limiting amplifier that can
accept a single-ended or differential signal with input
power between -6dBm and +6dBm in the 800MHz to
1000MHz frequency range. The baseband modulation
input is linear over a 2V range, and limits with larger
signal levels within the supply range. The double-
balanced mixer has been optimized for high carrier
rejection. The variable gain stage offers typically 40dB
of adjustment range. The power amplifier provides
more than 20dBm output power and has a bias adjust-
ment, which allows adjustment of efficiency and
harmonic distortion.
A shutdown function reduces the current draw to less
than 2µA in less than 10µs. The MAX2402 comes in a
20-pin SSOP package to minimize board area.
________________________Applications
Direct-Sequence Spread-Spectrum Transmitter
Frequency-Hopping Spread-Spectrum
Transmitter
FSK, GMSK, BPSK, and ASK Digital Transmitter
AM and FM Analog Transmitter
________________Functional Diagram
MODULATION
BUFFER
MOD
MIXER
VGC
VGC
POWER
AMPLIFIER
OUT
LO INPUT
BUFFER
LO+
LO-
MASTER BIAS
SHDN
BADJ
____________________________Features
o Low-Cost, Flexible Transmitter
o More than 100mW of Output Power into 50Ω
o Operates from 800MHz to 1000MHz
o Single +5V Supply
o 20-Pin SSOP Package
o Uses Less than 2µA in Power-Down
o More than 35dB of Power Adjustment Range
o LO Input Power Range from -6dBm to +6dBm
o 2V Linear Range on Modulation Input
______________Ordering Information
PART
MAX2402EAP*
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
* An alternate marking, MAX2402CAP, has been identically tested.
__________________Pin Configuration
TOP VIEW
VGC 1
MOD 2
GND 3
VCC 4
GND 5
LO+ 6
LO- 7
GND 8
SHDN 9
BADJ 10
MAX2402
20 GND
19 VCC
18 GND
17 GND
16 OUT
15 GND
14 OUT
13 GND
12 VCC
11 LGND
SSOP
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