CS42L55
1. PIN DESCRIPTIONS
36
35
34
33
32
31
30
29
28
SDIN
1
2
3
4
5
6
7
8
9
27
26
25
24
23
22
21
20
19
AIN1REF
AIN1A
AIN2B
AIN2REF
AIN2A
AFILTB
AFILTA
VQ
LRCK
SDA
SCL
GND/Thermal Pad
VCP
FLYP
+VHPFILT
FLYC
Top-Down (Through Package)
View
FILT+
FLYN
10
11
12
13
14
15
16
17
18
Pin Name
SDIN
#
Pin Description
Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
1
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data lines.
LRCK
2
SDA
SCL
VCP
3
4
5
Serial Control Data (Input/Output) - Serial data for the I²C serial control port.
Serial Control Port Clock (Input) - Serial clock for the I²C serial control port.
Step-Down Charge Pump Power (Input) - Power supply for the step-down charge pump.
Charge Pump Cap Positive Node (Output) - Positive node for the step-down charge pump’s flying
capacitor.
FLYP
6
7
Step-Down Charge Pump Filter Connection (Output) - Power supply from the step-down charge
pump that provides the positive rail for the headphone and line amplifiers
+VHPFILT
FLYC
Charge Pump Cap Common Node (Output) - Common positive node for the step-down and inverting
charge pumps’ flying capacitors.
8
Charge Pump Cap Negative Node (Output) - Negative node for the inverting charge pump’s flying
capacitor.
FLYN
9
Inverting Charge Pump Filter Connection (Output) - Power supply from the inverting charge pump
that provides the negative rail for the headphone and line amplifiers.
-VHPFILT
10
HPOUTA
HPOUTB
11 Headphone Audio Output (Output) - The full-scale output level is specified in the HP Output Charac-
13 teristics specification table
HPREF
12 Pseudo Diff. Headphone Output Reference (Input) - Ground reference for the headphone amplifiers
LINEOUTA
LINEOUTB
14 Line Audio Output (Output) - The full-scale output level is specified in the Line Output Characteristics
16 specification table
LINEREF
15 Pseudo Diff. Line Output Reference (Input) - Ground reference for the line amplifiers.
8
DS773F1
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