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MSM9831-xxx

¡ Semiconductor

NOTES

1. Internal converter circuit

The MSM9831 has not employed a voltage output type D/A converter but a current output type

D/A converter. Therefore, the voice output circuit of the MSM9831 is different from that of the

MSM6650 family product which has employed a voltage output type D/A converter. The voice

output circuit of the MSM9831 also is different from that of the MSM9800 family product because

the MSM9831 has employed a current flowing-in type D/A converter and the MSM9800 family

product has employed a current flowing-out type D/A converter. (See the table below)

MSM6650 family

MSM9800 family

MSM9831

Product name

D/A converter circuit type

D/A converter output circuit

Voltage output type

—

Current output (flowing-out) type

P-MOS open drain

Current output (flowing-in) type

N-MOS open drain

Circuit connection between the MSM9831 and amplifier IC

AOUT

GND

D/A converter

MSM9831

Current flowing direction

AMP

Resistor for conversion from current to voltage

AOUT

GND

D/A converter

Current flowing direction

AMP

Resistor for conversion from current to voltage

MSM9800 family

Circuit connection between the MSM9800 family product and amplifier IC

2. Ceramic oscillator

A crystal that is usable in this LSI is described in "Functional Description" of this document. If

you want to use another crystal, it is recommended to evaluate the crystal before using it.