BU8731KV

Features:

1) 3V single power supply (V_DD = 2.7V to 3.3V).
2) Built-in 14-bit precision linear, / 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 (32 BTL type).
Built-in earphone speaker amplifier (32 single type).
 Built-in drive amplifier for reception REXT (600).
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.


Application

Digital cellular telephones


Specifications

Parameter	Symbol	Limits	Unit
Digital power supply voltage	DVDD	-0.3~+4.5	V
Analog power supply voltage	RXVDD	-0.3~+4.5	V
	TXVDD	-0.3~+4.5	V
Digital input voltage	VDIN	DVSS-0.3~DVDD+0.3	V
Analog input voltage	VAIN	RXVSS-0.3~RXVDD+0.3	V
		TXVSS-0.3~TXVDD+0.3	V
Input current	IIN	-10~+10	mA
Power dissipation	Pd	400*1	mW
Operating temperature	Tstg	-50~+125
Storage temperature	Topr	-20~+85

*1 Reduced by 4.0mW for each increase in Ta of 1 over 25


Description

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, / 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.