GENERAL DESCRIPTION

The MSM7524 is the single chip DTMF transceiver –generator/receiver– with the call progress

tone generator/detector and the special tone –1300 Hz in the first version, possible to be

modified–detector.

Each function block can be controlled by an external MCU via 4-bit processor interface.

The chip operates with +5 V single supply with low power consumption, and is suitable for the telephone terminal equipment.

FEATURES

? Power supply voltage : +5 V ±10

? Low power consumption

Operating mode : 8 mA Typ.

Power down mode : 10 mA Typ.

? 4-bit processor interface

? Dynamic range of DTMF receiver : 40 dB

? Low signal distortion output from DTMF generator

? Call progress tone detector : 330 to 640 Hz

? Call progress tone generator : 350/400/440/480 Hz

? Special tone detector: 1300 Hz ±20 Hz (for FAX)

? 3.58 MHz crystal oscillator circuit on chip

? Package :

32-pin plastic SSOP (SSOP32-P-430-1.00–K) (Product name : MSM7524GS-K)