CS4385(2004) View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS4385
(Rev.:2004)

114 dB, 192 kHz 8-Channel D/A Converter

Cirrus Logic 

CS4385

3.7 ATAPI Specification

The CS4385 implements the channel mixing functions of the ATAPI CD-ROM specification. The

ATAPI functions are applied per A-B pair. Refer to Table 9 on page 46 and Figure 21 for addi-

tional information.

Left Channel

Audio Data

A Channel

Volume

Control

MUTE Aout Ax

SDINx

Σ

Σ

Right Channel

Audio Data

B Channel

Volume

Control

MUTE AoutBx

Figure 21. ATAPI Block Diagram (x = channel pair 1, 2, 3, or 4)

3.8 Direct Stream Digital (DSD) Mode

In software mode the DSD/PCM bits (Reg. 02h) are used to configure the device for DSD mode.

The DSD_DIF bits (Reg 04h) then control the expected DSD rate and MCLK ratio.

The DIR_DSD bit (Reg 04h) selects between two proprietary methods for DSD to analog conver-

sion. The first method uses a decimation free DSD processing technique which allows for fea-

tures such as matched PCM level output, DSD volume control, and 50kHz on chip filter. The

second method sends the DSD data directly to the on-chip switched-capacitor filter for conver-

sion (without the above mentioned features).

The DSD_PM_EN bit (Reg. 04h) selects Phase Modulation (data plus data inverted) as the style

of data input. In this mode the DSD_PM_mode bit selects whether a 128Fs or 64x clock is used

for phase modulated 64x data (see Figure 22). Use of phase modulation mode may not directly

effect the performance of the CS4385, but may lower the sensitivity to board level routing of the

DSD data signals.

The CS4385 can detect errors in the DSD data which does not comply with the SACD specifica-

tion. The STATIC_DSD and INVALID_DSD bits (Reg. 04h) allow the CS4385 to alter the incom-

ing invalid DSD data. Depending on the error, the data may either be attenuated or replaced with

a muted DSD signal (the MUTEC pins would be set according to the DAMUTE bit (Reg. 08h)).

DS671A1

25

Share Link: