BU8732AKV

Features:

1) +3V single power supply. (VDD=2.7 to 3.3V)
2) 14bit precision linear  / 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 :
    / 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 (32? BTL type)
    * Built-in speaker amplifier for earphone (32? single type)
    * Built-in speaker amplifier for REXT of call receiving system (600?)
    * 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.


Application

Digital cellular phones with CDMA system, Digital cellular phones with PDC system.


Specifications

Parameter	Symbol	Limits	Unit
Digital power supply voltage	DVDD	-0.3 to +4.5	V
Analog power supply voltage	RXVDD	-0.3 to +4.5	V
	TXVDD	-0.3 to +4.5	V
Digital pin apply voltage	VTD	DVSS-0.3 to DVDD+0.3	V
Analog pin apply voltage	VTA	RXVSS-0.3 to RXVDD+0.3	V
		TXVSS-0.3 to TXVDD+0.3	V
Input current	IIN	-10 to +10	mA
Power dissipation	Pd	400 *1	mW
Storage temperature range	Tstg	-50 to +125
Operation temperature range	Ta	-30 to +85

*1 Drops by 4.0mW per 1°C when used at more than Ta=25°C.


Description

BU8732AKV is a PCM codec IC for digital cellular phones. BU8732AKV includes plenty of analog input / output functions such as a 14bit precision linear. / 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.