CS42L50 datasheet(31/48 Pages) CIRRUS

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CS42L50

DS544PP1

5. PIN DESCRIPTIONS

Filter Capacitor

AFLTR

RST

Reset

Filter Capacitor

AFLTL

SCL

Control Port Clock

Voltage Reference

FILT+_ADC

SDA

Control Port Data

Analog Input 2 Right

AIN_R2

LRCK

Left/Right Clock

Analog Input 2 Left

AIN_L2

SDOUT

Serial Audio Data Output

Ground Reference

REF_GND

Analog Power

Analog Input 1 Right

AIN_R1

GND

Ground Reference

Analog Input 1 Left

AIN_L1

Interface Power

Quiescent Voltage

VQ_ADC

SDIN

Serial Audio Data Input

Voltage Reference

FILT+_DAC

MCLK

Master Clock

Quiescent Voltage

VQ_DAC

SCLK

Serial Clock

Headphone A Output

HP_A

MUTEC

External Mute Control

Headphone Amp Power

VA_HP

AOUTL

Analog Output Left

Headphone B Output

HP_B

AOUTR

Analog Output Right

821

Pin Name

Pin Description

23 Analog Power (Input) - Positive power supply for the analog section. Refer to the Recommended Oper-

ating Conditions for appropriate voltages.

21 Logic Power (Input) - Determines the required signal level for the digital input/output. Refer to the Rec-

ommended Operating Conditions for appropriate voltages.

VA_HP

13 Headphone Amp Power (Input) - Positive power supply for the headphone amplifier. Refer to the Rec-

ommended Operating Conditions for appropriate voltages.

VQ_ADC

VQ_DAC

9,11 Quiescent Voltage (Output) - Filter connection for internal quiescent voltage. VQ must be capacitively

coupled to analog ground, as shown in the Typical Connection Diagram. The nominal voltage level is

specified in the Analog Characteristics and Specifications section. VQ presents an appreciable source

impedance and any current drawn from this pin will alter device performance. However, VQ can be used

to bias the analog circuitry assuming there is no AC signal component and the DC current is less than

10uA.

REF_GND

Reference Ground

(Input) - Ground reference for the internal sampling circuits and must be connected

to analog ground.

GND

22 Ground (Input) - Ground reference. Should be connected to analog ground.

Serial Audio

Interface

MCLK

19 Master Clock (Input) - Clock source for the delta-sigma modulator and digital filters.

SCLK

18 Serial Clock (Input/Output) - Serial clock for the serial audio interface.

LRCK

25 Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the

serial audio data line. The frequency of the left/right clock must be at the audio sample rate, Fs.

SDIN

20 Serial Audio Data Input (Input) - Input for two’s complement serial audio data.

SDOUT

24 Serial Audio Data Output (Output) - Output for two’s complement serial audio data.

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