62
IC Diagrams
CS4272, Codec
PIN DESCRIPTIONS
CETUMBOTX
-BTUOAITX
+BTUOAKLCM
+ATUOAKCRL
-ATUOAKLCS
SDOUT (M/S CETUMA)
+TLIFNIDS
DNGADNGD
AVDV
-BNIALV
+BNIA0M
+ANIA1M
I2S/LJ AINA-
RST VCOM
1
2
3
4
5
6
7
128
22
23
24
25
26
27
28
9
10
11
7121
18
19
20
13
5141
16
28-Pin TSSOP
2.5 V to 5 V
Left and
Right Mute
Controls
∆Σ Modulator
∆Σ Modulator
Low-Latency
Anti-Alias Filter
External
Mute Control
Register / Hardware
Configuration
Internal Voltage
Reference
Internal
Oscillator
Volume
Control
Mixer
Selectable
Interpolation
Filter
Selectable
Interpolation
Filter
Reset
Left
Differential
Output
Right
Differential
Output
Switched Capacitor
DAC and Filter
Multibit
Oversampling
ADC
Multibit
Oversampling
ADC
Low-Latency
Anti-Alias Filter
High Pass Filter &
DC Offset Calibration
High Pass Filter &
DC Offset Calibration
PCM Serial Interface / Loopback
Left
Differential
Input
Right
Differential
Input
Volume
Control
Level Translator
Level Translator
Serial
Audio
Input
Serial
Audio
Output
3.3 V to 5 V 5 V
Hardware or
I
2
C/SPI
Control Data
Switched Capacitor
DAC and Filter
BLOCK DIAGRAM
Pin Name # Pin Description
XTO
XTI
1,2
Crystal Connections (Input/Output) - I/O pins for an external crystal which may be used to generate the
master clock.
MCLK
3
Master Clock (Input/Output) -Clock source for the delta-sigma modulators.
LRCK
4
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data line.
SCLK
5
Serial Clock (Input/Output) - Serial clock for the serial audio interface.
SDOUT
(M/S)
6
Serial Audio Data Output (Output) - Output for two’s complement serial audio data. This pin must be
pulled-up or pulled-down to select Master or Slave Mode.
SDIN
7
Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
DGND
8
Digital Ground (Input) - Ground reference for the internal digital section.
VD
9
Digital Power (Input) - Positive power for the internal digital section.
VL
10
Logic Power (Input) - Positive power for the digital input/output interface.
M0
11
Mode Select 0 (Input) - In conjunction with M1, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
M1
12
Mode Select 1 (Input) - In conjunction with M0, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
I2S/LJ
13
Serial Audio Interface Select (Input) - Selects either the left-justified or I
2
S format for the Serial Audio
Interface.
RST
14
Reset (Input) - The device enters a low power mode when this pin is driven low.
VCOM
15
Common Mode Voltage (Output) - Filter connection for internal common mode voltage.
AINA-
AINA+
AINB+
AINB-
16,
17,
18,
19
Differential Analog Input (Input) - The full scale differential input signals are presented to the delta-
sigma modulators. The full scale level is specified in the ADC Analog Characteristics specification table.
VA
20
Analog Power (Input) - Positive power for the internal analog section.
AGND
21
Analog Ground (Input) - Ground reference for the internal analog section.
FILT+
22
Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
AMUTEC
23
Channel A Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
AOUTA-
AOUTA+
AOUTB+
AOUTB-
24,
25,
26,
27
Differential Analog Audio Output (Output) - The full scale differential output level is specified in the
Analog Characteristics specification table.
BMUTEC
28
Channel B Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
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