CS42L51 Datasheet, PDF (7/83 Pages) Cirrus Logic – Low Power, Stereo CODEC with Headphone Amp

1. PIN DESCRIPTIONS - SOFTWARE (HARDWARE) MODE
CS42L51
32 31 30 29 28 27 26 25
LRCK 1
SDA/CDIN (MCLKDIV2) 2
SCL/CCLK (I²S/LJ) 3
AD0/CS (DEM) 4
VA_HP 5
FLYP 6
GNDHP 7
FLYN 8
CS42L51
24 AIN1B
23 AIN1A
22 AFILTB
21 AFILTA
20 AIN2B/BIAS
19 AIN2A
18 MICIN2/BIAS/AIN3B
17 MICIN1/AIN3A
9 10 11 12 13 14 15 16
Pin Name
LRCK
SDA/CDIN
(MCLKDIV2)
SCL/CCLK
(I²S/LJ)
AD0/CS
(DEM)
VA_HP
FLYP
GNDHP
FLYN
VSS_HP
AOUTB
AOUTA
VA
AGND
#
Pin Description
1 Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data line.
2 Serial Control Data (Input/Output) - SDA is a data I/O in I²C mode. CDIN is the input data line for the
control port interface in SPI mode.
MCLK Divide by 2 (Input) - Hardware Mode: Divides the MCLK by 2 prior to all internal circuitry.
3 Serial Control Port Clock (Input) - Serial clock for the serial control port.
Interface Format Selection (Input) - Hardware Mode: Selects between I²S & Left-Justified interface for-
mats for the ADC & DAC.
4 Address Bit 0 (I²C) / Control Port Chip Select (SPI) (Input) - AD0 is a chip address pin in I²C mode; CS
is the chip select signal for SPI format.
De-Emphasis (Input) - Hardware Mode: Enables/disables the de-emphasis filter.
5 Analog Power For Headphone (Input) - Positive power for the internal analog headphone section.
6 Charge Pump Cap Positive Node (Input) - Positive node for the external charge pump capacitor.
7 Analog Ground (Input) - Ground reference for the internal headphone/charge pump section.
8 Charge Pump Cap Negative Node (Input) - Negative node for the external charge pump capacitor.
9 Negative Voltage From Charge Pump (Output) - Negative voltage rail for the internal analog head-
phone section.
10 Analog Audio Output (Output) - The full-scale output level is specified in the DAC Analog Characteris-
11 tics specification table.
12 Analog Power (Input) - Positive power for the internal analog section.
13 Analog Ground (Input) - Ground reference for the internal analog section.
DS679A2
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