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)