TW2866C datasheet(32/143 Pages) RENESAS

32 / 143 page

TW2866C

FN8253 Rev. 0.00

Page 32 of 143

February 3, 2012

Audio Codec

The audio codec in the TW2866 is composed of five audio Analog-to-Digital converters, one Digital-to-

Analog converter, audio mixer, digital serial audio interface and audio detector shown as the Figure 22.

The TW2866 can accept 5 analog audio signals and 1 digital serial audio data and produce 1 mixing

analog audio signal and 2 digital serial audio data.

The level of analog audio input signal AIN1 ~ AIN5 can be adjusted respectively by internal programmable

gain amplifiers that are defined via the AIGAIN1,AIGAIN2,AIGAIN3,AIGAIN4 and AIGAIN5 registers and

then sampled by each Analog-to-Digital converters. The digital serial audio input data through the ACLKP,

ASYNP and ADATP pin are used for playback function. To record audio data, the TW2866 provides the

digital serial audio output via the ACLKR, ASYNR and ADATR pin.

The TW2866 can mix all of audio inputs including analog audio signal and digital audio data according to

the predefined mixing ratio for each audio via the MIX_RATIO1 ~ MIX_RATIO5 and MIX_RATIOP registers.

This mixing audio output can be provided through the analog and digital interfaces. The embedded audio

Digital-to-Analog converter supports the analog mixing audio output whose level can be controlled by

programmable gain amplifier via the AOGAIN register. The ADATM pin supports the digital mixing audio

output and its digital serial audio timings are provided through the ACLKR and ASYNR pins that are shared

with the digital serial audio record timing pins.

The main purpose of AIN5 is to make the standard I2S/DSP digital audio output on ADATM pin for special

application.Usually,4 AIN1/AIN2/AIN3/AIN4 audio data are only used on ADATR pin output.

TW2866C Datasheet(PDF) 32 Page - Renesas Technology Corp