General Description
The MAX2900–MAX2904 complete single-chip 200mW
transmitters are designed for use in the 868MHz/
915MHz frequency bands. The MAX2900/MAX2901/
MAX2902 are compliant with the FCC CFR47 part 15.247
902MHz to 928MHz ISM-band specifications. MAX2903/
MAX2904 are compliant with the ETSI EN330-220 speci-
fication for the European 868MHz ISM band.
These transmitter ICs offer a high level of integration
while minimizing the number of external components.
This is achieved by full integration of the transmit modu-
lator, power amplifier, RF VCO, 8-channel frequency syn-
thesizer, and baseband PN sequence lowpass filter. By
filtering the BPSK modulation, the spurious emissions are
reduced, enabling up to eight independent transmit
channels in the U.S. ISM band. Inputs are provided for
spread-spectrum BPSK, ASK, and OOK. FM can be
achieved by directly modulating the VCO. The devices
are intended primarily for use with an external differential
antenna.
Applications
Automatic Meter Reading
Wireless Security Systems/Alarms
Wireless Sensors
Wireless Data Networks
Wireless Building Control
Features
o Versions for U.S. 902MHz to 928MHz Band and
European 868MHz Band
o -7dBm to +23dBm Adjustable Differential RF
Output Power
o +23dBm Output Power at 4.5V, +20dBm Output
Power at 3.0V
o Support BPSK, OOK, ASK, and FM Modulations
o Modulation Filter for Direct Sequence BPSK up to
8Mchips/s
o Fully Integrated VCO with On-Chip Tank
o Extremely Low Frequency Pulling for OOK
Modulation (typ 60kHz peak, 5kHz RMS)
o Integrated Frequency Synthesizer for up to
8 Channels (MAX2900)
o +2.7V to +4.5V Supply Operation
o Small 28-Pin QFN Package with Exposed Pad
(5mm
5mm)
