BU8731 Datasheet | ROHM

munication 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 remendations. 4) Built-in PLL circuit for system clock generation. 5) Clock frequency for PCM data transmission can be set anywhere between 64k Hz (128k Hz when linear) to 2048k Hz. 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)....