The CMX909B is a half-duplex Gaussian Minimum Shift Keyed (GMSK) BT = 0.3 modem data pump with on-chip packet data handling.
GMSK modulation optimises data throughput and packet data handling eases µC processing.
The demodulator uses decision feedback equalisation to reduce channel distortion and enhance receiver performance.
The CMX909B is backwards compatible with the FX909A and MX909A modem. It offers improved performance, higher data rates and lower voltage operation, as well as handling the recent R14N extension to Mobitex for short block frames.
The modem offers 2-strength Xtal driver circuitry –multiple powersave options – for intelligent power management, and is available in 24-pin TSSOP, SSOP (low-height) and PDIP packages.
FX909A, MX909A and CMX909B FAQs
A. The CMX909B is completely software and hardware backward compatible with the FX909A. The default mode of operation of the CMX909B is identical to the FX909A and the registers, task names, pin names, etc remain unchanged.
The CMX909B provides enhanced operation by extending the number of tasks available using Register bits that were reserved on the FX909A and by sharing other bits.
The extended features are:
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