MSM7586-xx pie/4 Shift QPSK MODEM/ADPCM CODEC

MSM7586-xx pie/4 Shift QPSK MODEM/ADPCM CODEC

The MSM7586 is a CMOS IC developed for use with digital cordless telephones. The device provides a p/4 shift QPSK modem function and a CODEC function which performs transcoding between the voice band analog signal and 32 kbps ADPCM data. The MSM7586 performs DTMF tone and several types of tone gener.

Features

(p/4 Shift QPSK Modem Unit)
• 384 kbps transmission speed
• Built-in root Nyquist digital filter for the baseband band limiter
• Built-in D/A converters for the analog outputs of the quadrature signal component I and Q
• The DC offset and gain can be adjusted with respect to the differential I and Q analog outputs
• Completely digitized p/4 shift QPSK demodulator system (ADPCM CODEC Unit)
• ADPCM system: built-in ITU-T Recommendations G.726 (32kbps, 24 kbps, 16 kbps)
• Transmit/receive full-duplex capability
• PCM interface code format: selectable between m-law and A-law
• Serial ADPCM and PCM.