MSM7502
Multi-Function PCM CODEC
 

Documents

Description

The MSM7502, developed especially for low-power and multi-function applications in touch-tone telephone sets and digital telephone terminals of digital PBXs, is a single +5V power supply CODEC device.

The device consists of the analog speech paths directly connectable to a handset, the calling circuit directly connectable to a piezosounder, the push-button, key-scanning interface between push buttons and control processors, the dial tone generator, the µ-law/A-law CODEC, and the processor interface. The functions can be controlled via 8-bit data bus.

For the CODEC of the MSM7052, an MSM7543 is used as a core CODEC, so the MSM7502 provides the available bit clock range wider than the family product MSM6895.

In addition, the MSM7502 performs the greater key interface function and offers the upgraded side-tone level, receive level, and speaker pre-amplifier output level.

Block Diagram

Features

»	Single +5 V Power Supply
»	Low Power Dissipation »  Power ON Mode: 30 mW Typ. 53 mW Max. »  Power Saving Mode: 2 mW Typ. 5 mW Max.
»	In compliance with ITU-T's companding law
»	Transmission clocks: 64, 128, 256, 512, 1024, 2048 kHz 96, 192, 384, 768, 1536, 1544 kHz
»	Built-in PLL
»	Built-in Reference Voltage Supply
»	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
»	Key Scanning I/O »  Output: 8 bits »  Input: 8 bits
»	Direct Connection to Handset : 1.2 k driving available
»	Built-in Pre-amplifier for Loud-speaker
»	Hand-free Interface
»	µ-law/A-law Switchable CODEC
»	LCD Deflection Angle Voltage: Controlled by processor, 8 levels
»	Package: »  80-pin plastic QFP (QFP80-P-1420-0.80-BK) (Product name : MSM7502GS-BK)