GENERAL DESCRIPTION

The MSM7502, developed especially for low-power and multi-function applications in touchtone telephone sets and digital telephone terminals of digital PBXs, is a single +5 V 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, them-law/A-law CODEC, and the processor interface. The functions can be controlled via 8-bit data bus.

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 kW driving available

? Built-in Pre-amplifier for Loud-speaker

? Hand-free Interface

? m-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)