Rohm BU8731KV Pcm codec ic for digital cellular telephone Datasheet

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.
Applications
Digital cellular telephones
Features
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:
Built-in mic amplifier.
Built-in receiver speaker amplifier (32Ω BTL type).
Built-in earphone speaker amplifier (32Ω single
type).
Absolute maximum ratings (Ta = 25C)
610
Built-in drive amplifier for reception REXT (600Ω).
Built-in electronic volume control for gain adjustment (for reception, transmission, and tone).
Data signal I / O circuit allows for connection to external devices.
For the REXT output and earphone output, softmute function reduces pop noise when the power
is turned on and off.
7) DTMF signal and scale tone signal generator functions are built into the tone signal generator block.
8) Internal switching transistor for ringer drive.
9) VQFP 48-pin package.
Communication ICs
BU8731KV
Recommended operating conditions (Ta = 25C)
Block diagram
611
Communication ICs
Pin descriptions
612
BU8731KV
Communication ICs
BU8731KV
613
Communication ICs
BU8731KV
Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz)
614
Communication ICs
BU8731KV
Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz,
FElectrical characteristics (gain of each attenuator = 0dB)
615
Communication ICs
616
BU8731KV
Communication ICs
BU8731KV
617
Communication ICs
Digital AC characteristics
618
BU8731KV
Communication ICs
BU8731KV
Measurement circuit
619
Communication ICs
External dimensions (Units: mm)
620
BU8731KV
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