AC108
4 Channel Voice Capture ADCs
CONTENTS
Features...................................................................................................................................................................... 5
Description..................................................................................................................................................................5
Applications................................................................................................................................................................ 6
Functional Block Diagram...........................................................................................................................................7
Pin Assignment........................................................................................................................................................... 8
Package Dimension.....................................................................................................................................................9
Pin/Signal Description.............................................................................................................................................. 10
Electrical Characteristics...........................................................................................................................................12
Absolute Maximum Ratings............................................................................................................................. 12
Recommended Operating Conditions..............................................................................................................12
Static Characteristics........................................................................................................................................ 12
Analog Performance Characteristics........................................................................................................................ 14
Typical Power Consumption..................................................................................................................................... 15
Typical Application Diagram..................................................................................................................................... 16
Revision 1.0
Copyright © 2017 X-Powers Limited. All Rights Reserved.
4
AC108
4 Channel Voice Capture ADCs
4 Channel Voice Capture ADCs IC
FEATURES
DESCRIPTION
The AC108 is a highly integrated quad-channel ADC
with I2S/TDM output transition. It's designed for
multi-microphone array in high definition voice
capture and recognition application platforms.
The integrated digital PLL supports a large range of
input/output frequencies, and it can generate
required system clocks from common reference
clock such as 6-/12-MHz, 6.144-/12.288-MHz,
5.6448-/11.2896-MHz, 13MHz and 19.2MHz. The
audio sample 8kHz, 12kHz,16kHz, 22.05kHz, 24kHz,
32kHz, 44.1kHz, 48kHz, 96kHz is supported.
The AC108 integrates four synchronized ADCs with
independent programmable mic bias voltage and
mic boost amplifier to deliver valid channel data
that channel crosstalk can be eliminated. The
analog input port MIC1P/N ~MIC4P/N is designed
as four differential microphone pin or single-ended
line-in pin .Two smart digital mic interfaces are
supported to make low jitter clock output and
decimation filter for up to four digital mic.
Independent digital voice controllers are provided
in each channel.
The AC108 can transit its four channels output data
over two I2S ports by standard I2S or PCM format,
also a single port by TDM format. A new format
called encoding mode can also be used to transit
four channel data when the I2S format of AP is
normal protocol types. Furthermore, one to four
device can be combined to transit up to 16
channels output data by a single TDM line.
The device includes several DSP features such as
high-pass filter, mixer, and volume control.
AC108 is controlled through TWI (2-wire serial
interface). The clock supports up to 400 KHz rate. It
works only in the slave mode.
ADC future
108 dB dynamic range (A-weighted) @ 0 dB
boost gain
–90 dB THD+N @ 0 dB boost and 1.4Vpp input
4 programmable boost amplifiers with 0dB to
30dB in 1dB step
ADC sample rates supported: 8kHz, 16kHz,
22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz,96KHz
Analog and digital mixer in record data path
Analog Input and output
Four fully differential microphone inputs:
MIC1P/N ~MIC4P/N
-Can
be configured as pseudo differential,
single-ended mode
Four low noise mic bias outputs:
MIC1_BIAS~MIC4_BIAS
-Programmable
bias voltage 1.5V to 3.4V
-4uV
noise level in signal bandwidth
Digital Output
Two digital microphone SCLK output@1M~3M
Two I2S data output:
-
I2S/PCM format using 2 pins to output 4 channel data
-TDM
format using 1 pin to output 4 channel data even
16 channel of 4 devices
-Encoding
format using 1 pin to output 4 channel data
even 16 channel of 4 devices
Other Features
PLL support a wide input for wide range
Integrated LDO allowing single supply (3.3V~5V)
4 ADC channel 16mA@3.3V for low power
consumption application
TWI control interface support up to 400 kHz
QFN 48-pin package, 6mm x 6mm
Revision 1.0
Copyright © 2017 X-Powers Limited. All Rights Reserved.
5
电源技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
