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)