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| Communication ICs PCM codec IC for digital cellular telephones BU8733KV The BU8733KV is a PCM codec IC developed for use with digital cellular telephones. The BU8733KV contains analog input / output features such as a 14-bit linear precision, / A-LAW codec, mic and speaker amplifiers, and a switching transistor for the ringer drive. Also, there is a built-in DSP interface circuit for support of multiple DSP formats making this IC perfect for use with PDC 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, / 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) Tone signal generator contains DTMF signal, scale tone, and variable tone functions. 6) Analog input / output functions: S Built-in mic amplifier. S Built-in receiver speaker amplifier (32 BTL type). FAbsolute maximum ratings (Ta = 25_C) S Built-in attenuator for wide gain adjustment range. S Data signal I / O circuit allows for connection to external devices. S For the external output and receiver output, softmute function reduces pop noise when the power is turned on and off. 7) Internal switching transistor for ringer drive. 8) Internal DSP interface circuit supports multiple DSP formats. 599 Communication ICs FRecommended operating conditions (Ta = 25_C) BU8733KV FBlock diagram 600 Communication ICs FPin descriptions BU8733KV 601 Communication ICs BU8733KV 602 Communication ICs BU8733KV FElectrical characteristics(unless otherwise noted, Ta = 25_C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz, gain of each attenuator = 0dB) 603 Communication ICs BU8733KV 604 Communication ICs BU8733KV 605 Communication ICs FDigital AC characteristics BU8733KV 606 Communication ICs FMeasurement circuit BU8733KV 607 Communication ICs FApplication example BU8733KV 608 Communication ICs FExternal dimensions (Units: mm) BU8733KV 609 |
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