BU8732AKV Datasheet, PDF (1/11 Pages) Rohm – CODEC IC for digital mobile phone

Communication ICs
BU8732AKV
CODEC IC for digital mobile phone
BU8732AKV
BU8732AKV is a PCM codec IC for digital cellular phones. This includes plenty of analog input / output functions such as
a 14bit precision linear. µ / A-LAW codec, a microphone amplifier with two systems, amplifiers for speaker and earphone
and a switch transistor for driving a ringer. This IC is the most suitable for both PDC system and CDMA system cellular
phones.
zApplication
Digital cellular phones with CDMA system, Digital cellular phones with PDC system.
zFeatures
1) +3V single power supply. (VDD=2.7 to 3.3V)
2) 14bit precision linear ‚ µ / A-LAW codec.
3) Transmission filter of the codec block is in conformity to the ITU-T recommendation G. 714.
4) Built-in PLL circuit for system clock generation.
5) Built-in DSP I/F which is in conformity with PDC and N-CDMA.
6) Arbitrary setting of the clock frequency of PCM data transmission is allowed :
µ / A-LAW
64kHz to 2048kHz
Linear
128kHz to 2048kHz
7) Plenty of input / output analog functions :
• Two systems of built-in microphone amplifier (differential input type, single input type)
• Built-in speaker amplifier for receiver (32Ω BTL type)
• Built-in speaker amplifier for earphone (32Ω single type)
• Built-in speaker amplifier for REXT of call receiving system (600Ω)
• Built-in electronic volumes for gain adjustment. (Call-receiving system, call sending system, TONE system)
• Built-in input / output circuit for data signal which allows external connection.
• Pop noise of REXT earphone and receiver outputs at the time of switching on and off the power supply is reduced
by means of soft mute.
8) A built-in function to generate DTMF signals and musical scale tones is provided in the tone signal generating block.
9) Built-in switch transistor for driving a ringer.
10) VQFP 48 pin package.
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