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BU8731KV

PCM codec IC for digital cellular telephones

ROHM Semiconductor 

Communication ICs

PCM codec IC for digital cellular

telephones

BU8731KV

The BU8731KV is a PCM codec IC developed for use with digital cellular telephones. It contains analog input / output

features such as a 14-bit linear precision, µ / A-LAW codec, mic and speaker amplifiers, and switching transistor for the

ringer drive. This all makes the BU8731KV perfect for PDC and CDMA-type cellular telephones.

FApplications

Digital cellular telephones

FFeatures

1) )3V single power supply (VDD = 2.7V to 3.3V).

2) Built-in 14-bit precision linear, µ / A-LAW codec.

3) Transmission filter for the codec unit conforms to

ITU-T recommendations.

4) Built-in PLL circuit for system clock generation.

5) Clock frequency for PCM data transmission can be

set anywhere between 64kHz (128kHz when linear)

to 2048kHz.

6) Analog input / output functions:

S Built-in mic amplifier.

S Built-in receiver speaker amplifier (32Ω BTL type).

S Built-in earphone speaker amplifier (32Ω single

type).

S Built-in drive amplifier for reception REXT (600Ω).

S Built-in electronic volume control for gain adjust-

ment (for reception, transmission, and tone).

S Data signal I / O circuit allows for connection to ex-

ternal devices.

S For the REXT output and earphone output, soft-

mute function reduces pop noise when the power

is turned on and off.

7) DTMF signal and scale tone signal generator func-

tions are built into the tone signal generator block.

8) Internal switching transistor for ringer drive.

9) VQFP 48-pin package.

FAbsolute maximum ratings (Ta = 25_C)

610

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