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AN259

Transitioning from the CS4382 to the CS4382A or CS4385

1. Introduction

This application note describes how to transition easily to the CS4385 or CS4382A from an existing

design which uses the CS4382. The CS4382A was designed to give a simple upgrade path from the

CS4382 whereas the CS4385 adds some additional features. Please refer to the CS4382A and CS4385

data sheets for supplemental information and specifications concerning operation of the device. A brief

comparison between the product families is shown in Table 1.

1.1 What the CS4382A offers over the CS4382:

• Sixth order multi-bit delta-sigma modulator for lower out of band noise

• Increased full-scale output level for ease of board level noise management

• Improved lower latency PCM digital filter

• Non-decimating DSD processor with on chip 50 kHz filtering

• Uses identical register mapping

1.2 Changes from the CS4382 that the CS4382A requires:

• The VD supply must be changed to 2.5 V from either the 3.3 V or 5 V of the CS4382

•

Depending on the desired output voltage requirements, attenuation may need to be added to the off-chip filter.

• Loss of simultaneous support for two synchronous sample rates mode which was available in the CS4382.

This mode provided for dual sample rates such as

192 kHz front channels with 96 kHz surrounds for

DVD audio and required the use of

LRCK2 and SCLK2. This mode is not offered in the CS4382A or

CS4385.

• Additional resistors on MUTEC pins

1.3 What the CS4385 offers over the CS4382A:

• Additional DSD functions of Volume control, Mute pattern detect, support for phase modulation mode, and

offers a direct to switched capacitor path.

• 1/2 dB volume control steps (vs. 1 dB in CS4382/82A)

• One-Line and TDM modes

• Auto-mute polarity detection

• Auto-speed mode detection

1.4 Changes from the CS4382 that the CS4385 requires:

• The VD supply must be changed to 2.5 V from the either 3.3 V or 5 V of the CS4382

•

Depending on the desired output voltage requirements, attenuation may need to be added to the off-chip filter.

• Simultaneous support for two synchronous sample rates is no longer available

• Additional resistors on MUTEC pins

• 4 pins change location or function for hardware mode. The changes aren't necessary for software mode.

• Requires different register mapping from the CS4382

JAN ‘09

AN259REV2

1 2 3 4 5 6

Indice de contenidos

Pagina 1 - 1. Introduction

Pagina 2 - 2. The Design Transition

AN2592 AN259REV2 For users of the CS4382, the CS4385 is a simple, yet affordable, upgrade to a richer feature set and lowerout-of-band noise performan

Pagina 3 - Figure 2. CS4382A pinout

AN259AN259REV2 3Location or function changes as denoted in Figure 1 are as follows:• The CS4385 does not support the simultaneous synchronous sample r

Pagina 4 - Figure 4. CS4385 pinout

AN2594 AN259REV2alog filter gain (if similar output level to the CS4382 is desired).- The mute control pins are high impedance while reset is asserted

Pagina 5 - AN259REV2 5

AN259AN259REV2 5Pins which require changes to external components or voltages as denoted in Figure 4 are as follows:• Pin 4 (VD) requires 2.5 V for re

Pagina 6 - Table 2. Revision History

AN2596 AN259REV2Table 2. Revision History Release Date ChangesREV1 JAN 2005 Initial ReleaseREV2 JAN 2009 Added text to indicate MUTEC pins of the CS43

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Cirrus-logic AN259 Manual de usuario

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