GENERAL DESCRIPTION

The MSM7584C is a CMOS IC developed for use with digital cordless telephones. The device provides a π/4 shift QPSK modem function and a CODEC function which performs transcoding between the voice band analog signal and 32 kbps ADPCM data.

The MSM7584C is ideal for use in a handset of the PHS (Personal Handyphone System).

FEATURES

(π/4 Shift QPSK Modem)

• Built-in root Nyquist filter (a (rolloff rate) = 0.5) for the baseband limiter

• Differential I and Q analog outputs

• The DC offset and gain can be adjusted with respect to the differential I and Q analog outputs

• Completely digitized π/4 shift QPSK demodulator system

• Input IF signal frequency of 1.2 MHz or 10.8 MHz is available.

• Built-in A/D converter for RSSI detection

(ADPCM CODEC)

• ADPCM : ITU-T Recommendations G.721 (32 kbps)

• Transmit/receive full duplex capability

• PCM interface code format: selectable between m-law and A-law

• Built-in transmit/receive mute function and transmit/receive programmable gain setting function

• Side tone path formation and level adjustment capabilities

• Built-in DTMF tone and other tones

• Built-in VOX function

• Built-in speech recording/playing interface

• Built-in 150 W driving OP AMP

• Built-in various analog switches

(Common)

• Single 3V power supply (VDD: 2.7 V to 3.6 V)

• Mode setting through serial interface

• Low power consumption

When the modem unit is operating : 13 mA Typ. (VDD = 3.0 V)

When the ADPCM CODEC unit is operating : 7 mA Typ. (VDD = 3.0 V)

When in the power down mode : 0.03 mA Typ. (VDD = 3.0 V)

• Package:

80-pin plastic TQFP (TQFP80-P-1212-0.50-K) (Product name : MSM7584CTS-K)