621
Communication ICs
Linear codec IC for digital cellular tele-
phones
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.
F
Applications
Digital cellular telephones
F
Features
1)
)
3V single power supply (V
DD
= 2.7V to 3.3V).
2) Low current consumption of 8.2mA (typ.) when fully
operating and 20
A (max.) when powered down
(V
DD
= 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 gen-
erator 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.
8) Analog input / output functions:
S
Built-in mic amplifier with gain switching capabili-
ties.
S
Data signal I / O circuit allows for connection to ex-
ternal 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.
F
Absolute maximum ratings (Ta = 25
_
C)
624
Communication ICs
BU8730KV
F
Electrical characteristics (unless otherwise noted, Ta = 25
_
C, DV
DD
= RXV
DD
= TXV
DD
= 3.0V, FSYNC = 8kHz,
FElectrical characteristics (
gain of each attenuator = 0dB)
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