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 specification
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 modulator,
power amplifier, RF VCO, 8-channel frequency synthesizer,
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

MAX2900–MAX2904是完备的单片200mW发送器，专为868MHz/915MHz波段的应用而设计。MAX2900/MAX2901/MAX2902符合FCC CFR47的第15.247部分有关902MHz至928MHz ISM波段的规范。MAX2903/MAX2904符合为欧洲868MHz ISM波段设定的ETSI EN330-220规范。

这些发送IC在提供高度集成的同时大大减少了外部元件的数量，这一目标是通过完全集成的发送调制器、功率放大器、RF VCO、8通道频率合成器以及基带PN序列低通滤波器实现的。通过对BPSK调制信号滤波，降低了杂散信号的辐射，在美国ISM波段内能够获得八个独立的发送信道。为扩频BPSK、ASK和OOK提供输入，通过直接调制VCO实现调频(FM)。这些器件适合与外部差分天线配合使用。