CDB4391 datasheet(21/40 Pages) CIRRUS

21 / 40 page

CS4391

DS335PP3

PIN DESCRIPTION - PCM DATA MODE

Reset - RST

Pin 1, Input

Function:

Hardware Mode: The device enters a low power mode and the internal state machine is reset to the de-

fault setting when low. When high, the device becomes operational.

Control Port Mode: The device enters a low power mode and all internal registers are reset to the default

settings, including the control port, when low. When high, the control port becomes operational and the

PDN bit must be cleared before normal operation will occur. The control port can not be accessed when

reset is low. The Control Port Enable Bit must also be enabled after a device reset.

RST is required to remain low until the power supplies and clocks are applied and stable.

Interface Power - VL

Pin 2, Input

Function:

Digital interface power supply. Typically 1.8 to 5.0 VDC. The voltage on this pin determines the logic level

high threshold for the digital inputs. The voltage on VL is the maximum allowable input level for all digital

inputs.

Serial Audio Data - SDATA

Pin 3, Input

Function:

Two’s complement MSB-first serial data is input on this pin. The data is clocked into SDATA via the serial

clock and the channel is determined by the Left/Right clock. The required relationship between the

Left/Right clock, serial clock and serial data is defined by the Mode Control Byte in Control Port Mode or

the Mode Pins in Hardware Mode. The options are detailed in Figures 6-24.

Reset

RST

AMUTEC

Channel A Mute Control

Logic Voltage

AOUTA-

Differential Output

Serial Data

SDATA

AOUTA+

Differential Output

Serial Clock

SCLK

Analog Power

Left/Right Clock

LRCK

AGND

Analog Ground

Master Clock

MCLK

AOUTB+

Differential Output

See Description

AOUTB-

Differential Output

See Description (SCL/CCLK) M2

BMUTEC

Channel B Mute Control

See Description (SDA/CDIN) M1

CMOUT

Common Mode Voltage

See Description

(AD0/CS) M0

FILT+

Positive Voltage Reference

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