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MSM7502

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7502

PIN AND FUNCTIONAL DESCRIPTIONS

LA, LB

General latch outputs for external control.

Statuses of these outputs are controlled via the processor interface. Refer to the description of the

control data for details. These outputs provide the capability to drive one TTL.

DG

Digital Ground.

DG is separated from the analog ground AG inside the device. But, DG should be connected as

close to the AG pin on PCB as possible.

AG

Analog Ground.

SA0, SA1

Sounder (calling tone) driving outputs.

The output signal on SA1 is inverted against the signal on SA0. The sounder circuit can be easily

configured by connecting a piezo-sounder between SA0 and SA1. Through processor control, the

calling tone volume is selectable from four levels and one of six tone combinations is selectable.

Initially, the ringing tone volume is set at a maximum and the tone combination is set at a 16 Hz

Wamble tone by a combination of 1 kHz and 1.3 kHz. If these pins are used with no-load, tone

volume cannot be controlled. When tone volume control is required, a load resistor must be

connected between SA0 and SA1.

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