Datasheet

1.
Description
The AC101 is a highly integrated audio codec designed for player and tablet application platforms. It has
one I2S/PCM interface, 2 channel DAC and 2 channel ADC with a high level of mixed-signal integration.
An integrated digital PLL supports a large range of input/output frequencies, and It can generate required
audio clocks for codec from standard audio crystal rate such as 22.5792MHz and 24.576MHz, also can be
from common reference clock frequencies such as 12MHz, 13MHz and 19.2MHz, and an internal RC
oscillator can be used in Free-running Mode, where the application processor can be inactive during voice
call application. The 2 ADC and 2 DAC in device use advanced multi-bit delta-sigma modulation technique
to convert data between analog and digital . The SNR performance can reach 100 dB A-wight.
Three analog input paths allow diverse analog audio sources such as two sets of differential microphone,
one differential or single-ended linein or stereo FM input.
One ground-reference headphone output is provided. The output amplifier are powered from an integrated
Charge Pump in order to achieve a higher quality, less power consumption in headphone playback, whist
without any DC blocking capacitor and avoiding unwanted noise.
Two stereo differential speaker output is available by using an external amplifier to drive the loud-speaker.
It can also be configured as single-ended output pin for some application of external single-ended amplifier.
The flexible analogue and digital mixers form a varied signal routing to support a complicated application.
AC101 is controlled through TWI (2-wire serial interface ) or RSB
①
(reduced serial bus) . It works only in
the slave mode .
The integrated DRC(Dynamic Range Controller) function in AC101 provide an useful digital sound
processing capability in DAC playback path to speaker . It is uesed to attenuate the peak signals and boost
the low-level signals by adjusting the output signal gain in some conditions. The DRC functions can be
enable or disable in the playback path .
The integrated AGC(Automatic Gain Controller) function can be used to maintain a constant recording
level in ADC record path . The DRC can make an improvement in background noise by setting a
programmable Noise Gate to attenuate very low-level input signals .
Note: ① The RSB is independent R&D by x-powers, supports a special protocols with a simplified two wire protocol on a push-pull bus. The
transfer speed in AC101 can be up to 10MHz .