GENERAL DESCRIPTION

The MSM7503 is a high performance, low power CODEC LSI device integrating a 2-wire time division transmission (ping-pong transmission) interface function and has a basic function of man-machine interface to that of the MSM7502.

The MSM7503 operates from single 5 V power supply and is ideal for digital telephone terminals such as pushbutton telephone sets and digital PBXs.

FEATURES

? Single +5 V Power Supply

? Low Power Dissipation

Power ON Mode : 50 mW Typ. 100 mW Max.

Power Down Mode : 15 mW Typ. 30 mW Max.

? Pin-Pong Transmission : Burst of 8 kHz, Transmission of 256 kbps,

AMI coding, 2-wire time division transmission

? Transmission data configuration : Transmit Start bit (1 bit), K-bit (1 bit),

Control bit (2 bits), Voice bit (8 bits),

DC balance bit (1 bit), totalling 13 bits

Receive Sync bit (4 bits), K-bit (1 bit),

Control bit (2 bits), Voice bit (8 bits),

DC balance bit (1 bit), totalling 16 bits

? Control Data Interface supports synchronous and asynchronous communications

? Built-in Power-on Reset by the power supply voltage monitoring

? Output of the ping-pong transmission monitoring signal

? CODEC complied by the ITU-T companding law

? Calling Tone Interval : Controlled by processor

? Calling Tone Combination : Controlled by processor, 6 modes

? Calling Tone Volume : Controlled by processor, 4 modes

? Ringing Tone Interval : Controlled by processor

? Ringing Tone Frequency : Controlled by processor, 6 modes

? Ringing Tone Level : Controlled by processor, 4 levels

? Built-in PB Tone Generator

? Built-in Speech path Control Switches

? General Latch Output for External Control : 2 bits

? Watch-dog Timer : 500 ms