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| Communication ICs Linear codec IC for digital cellular telephones BU8730KV The BU8730KV is a linear codec IC developed for use with digital cellular telephones. It contains a 14-bit precision linear codec and various other analog input / output features. Also, there is a built-in DAI and many tone signal functions making this IC perfect for use with GSM cellular telephones. FApplications Digital cellular telephones FFeatures 1) )3V single power supply (VDD = 2.7V to 3.3V). 2) Low current consumption of 8.2mA (typ.) when fully operating and 20 A (max.) when powered down (VDD = 3V). 3) Built-in 14-bit precision linear codec. 4) Transmission filter for the codec unit conforms to ITU-T recommendation G.714. 5) DTMF signal, GSM triple tone, and scale tone signal generator functions are built into the tone signal generator block. 6) Signal generator and output level adjustment circuits are built in with the sounder output functions. 7) Built-in PLL circuit for system clock generation. FAbsolute maximum ratings (Ta = 25_C) 8) Analog input / output functions: S Built-in mic amplifier with gain switching capabilities. S Data signal I / O circuit allows for connection to external devices. S Receiver output, ringer output, and EXT output are soft mute compatible. 9) Internal DAI (digital audio interface) with GSM11.10 support. 10) Internal DSP interface circuit supports multiple DSP formats. 11) VQFP 48-pin package. 621 Communication ICs FRecommended operating conditions (Ta = 25_C) BU8730KV FBlock diagram 622 Communication ICs FPin descriptions BU8730KV 623 Communication ICs BU8730KV FElectrical characteristics (unless otherwise noted, Ta = 25_C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz, FElectrical characteristics (gain of each attenuator = 0dB) 624 Communication ICs BU8730KV 625 Communication ICs BU8730KV 626 Communication ICs FDigital AC characteristics BU8730KV 627 Communication ICs FMeasurement circuit BU8730KV 628 Communication ICs FApplication example BU8730KV 629 Communication ICs FExternal dimensions (Units: mm) BU8730KV 630 |
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