CS5394

16

DS258PP4

MCLKD - Digital Section Input Clock, Pin 20.

MCLKD clocks the digital filter and must be connected to MCLKA. The required MCLKD

frequency is determined by the desired sample rate. A MCLKD of 12.288MHz corresponds to

Fs equal to 48 kHz. MCLKA must be connected to MCLKD.

PDN - Power Down, Pin 19.

When high, the device enters power down. Upon returning low, the device enters normal

operation and issues commands to initialize the voltage reference and synchronize the analog

and digital sections of the device.

S/M - Slave or Master Mode, Pin 17.

When high, the device is configured for Slave mode where LRCK and SCLK are inputs. The

device is configured for Master mode where LRCK and SCLK are outputs when S/M is low.

Digital Outputs

DACTL- Digital to Analog Control Output, Pin 9.

Must be connected to ADCTL. This signal enables communication between the digital and

analog circuits.

SDATA - Digital Audio Data Output, Pin 16.

The 24-bit audio data is presented MSB first, in 2’s complement format. This pin has a internal

pull-down resistor and must remain low during the power-up sequence to avoid accessing a test

mode.

Digital Inputs or Outputs

LRCK - Left/Right Clock, Pin 13.

LRCK determines which channel, left or right, is to be output on SDATA. The relationship

between LRCK, SCLK and SDATA is controlled by the Digital Format Select (DFS) pin.

Although the outputs for each channel are transmitted at different times, Left/Right pairs

represent simultaneously sampled analog inputs. In master mode, LRCK is an output whose

frequency is equal to Fs. In Slave Mode, LRCK is an input whose frequency must be equal to

Fs.

SCLK - Serial Data Clock, Pin 14.

Clocks the individual bits of the serial data from SDATA. The relationship between LRCK,

SCLK and SDATA is controlled by the Digital Format Select (DFS) pin. In master mode,

SCLK is an output clock at 64

× Fs. In slave mode, SCLK is an input which requires a

continuously supplied clock at any frequency from 48

× to 128× Fs (64× is recommended).