ACS522D01
LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC
1. OVERVIEW
1.1. Block Diagram
The ACS522D01 is an advanced low power codec with integrated headphone amplifiers and PLL. To support the
design of audio subsystems in a portable device, the ACS522D01 features an intelligent codec architecture with
advanced audio processing algorithms, integrated with a true cap-less headphone amplifier, and microphone interface
with programmable gain.
PVDD
AVDD 2
CAP-
CPVDD
CAP+
V-
Clocking
DVDD_CORE
DVDD_IO
VDD_PLL2
VDD_PLL1
Charge-Pump
Internal Audio Clock(s)
MCLK
PLLs
Digital
Volume
Anti-
pop
HP
DAC Left
DAC
HP Out Left
Vref
I2C_SDA
I2C_SCL
HP_DET
TEST
AFILT1
AFILT2
Control
Digital
Volume
Anti-
pop
HP
DAC Right
DAC
HP Out Right
Audio Processing
Bass/Treble Enhancement
SYSTEM EQ
DAC Left
DACBCLK
DACLRCLK
DACIN
SPEAKER EQ
3-D effect
Compressor-limiter
Dynamic Range Expander
LIN1
LIN2
DAC Right
+
-
D2S
D2S
RIN1
RIN2
ADCOUT
ADCLRCLK
ADCBCLK
-97 to +30 dB
In 0.5 dB steps
AGND
-
LIN1
MIC Bias
-17 to +30dB in 0.75dB steps
AGC
+0/+10/+20/+30 dB
Boost
Vref
+
LIN2
LIN3
D2S
Audio
Processing
VOL
mute
ADCL
LIN1
LIN2
-97 to +30 dB
In 0.5 dB steps
Automatic Level Control
S
LIN3/DMIC_CLK*
RIN1
RIN2
RIN3
D2S
Audio
Processing
VOL
AGC
Boost
mute
ADCR
RIN1
-17 to +30dB in 0.75dB steps
+0/+10/+20/+30 dB
RIN2
RIN3/DMIC_DAT*
*Digital Microphone Products
VSS_PLL
VSS_XTAL
2
DVSS
AVSS
CPGND
Figure 1. Block Diagram
1.2. Audio Outputs
The ACS522D01 provides a line-out/capless stereo headphone port with ground referenced outputs, capable of
driving headphones without requiring an external DC blocking capacitor.
Each endpoint features independent volume controls, including a soft-mute capability which can slowly ramp up or
down the volume changes to avoid unwanted audio artifacts.
The ACS522D01 output signal paths consist of digital filters, DACs and output drivers. The digital filters and DACs are
enabled when the ACS522D01 is in ‘playback only’ or ‘record and playback’ mode. The output drivers can be sepa-
rately enabled by individual control bits.
The digital filter and audio processing block processes the data to provide volume control and numerous sound
enhancement algorithms. Two high performance sigma-delta audio DACs convert the digital data into analog.
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©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
ACS522D01