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是完備的單片200mW發(fā)送器，專為868MHz/915MHz波段的應(yīng)用而設(shè)計。MAX2900/MAX2901/MAX2902符合FCC CFR47的第15.247部分有關(guān)902MHz至928MHz ISM波段的規(guī)范。MAX2903/MAX2904符合為歐洲868MHz ISM波段設(shè)定的ETSI EN330-220規(guī)范。

這些發(fā)送IC在提供高度集成的同時大大減少了外部元件的數(shù)量，這一目標(biāo)是通過完全集成的發(fā)送調(diào)制器、功率放大器、RF VCO、8通道頻率合成器以及基帶PN序列低通濾波器實現(xiàn)的。通過對BPSK調(diào)制信號濾波，降低了雜散信號的輻射，在美國ISM波段內(nèi)能夠獲得八個獨立的發(fā)送信道。為擴(kuò)頻BPSK、ASK和OOK提供輸入，通過直接調(diào)制VCO實現(xiàn)調(diào)頻(FM)。這些器件適合與外部差分天線配合使用。