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AN260

Transitioning from the CS4362 to the CS4362A or CS4365

1. Introduction

This application note describes how to transition easily to the CS4365 or CS4362A from an existing

design that uses the CS4362. The CS4362A was designed to give a simple upgrade path from the

CS4362, whereas the CS4365 adds some additional features. Please refer to the CS4362A and CS4365

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 CS4362A offers over the CS4362:

• 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 CS4362 that the CS4362A requires:

• The VD supply must be changed to 2.5 V from either the 3.3 V or 5 V of the CS4362.

•

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 CS4362.

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 CS4362A or CS4365.

• Additional resistors on MUTEC pins.

1.3 What the CS4365 offers over the CS4362A:

• 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 CS4362/62A)

• One-Line and TDM modes

• Auto-mute polarity detection

• Auto-speed mode detection

1.4 Changes from the CS4362 that the CS4365 requires:

• The VD supply must be changed to 2.5 V from the either 3.3 V or 5 V of the CS4362.

•

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.

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

• Requires different register mapping from the CS4362.

JAN ‘09

AN260REV2

1 2 3 4 5 6

Résumé du contenu

Page 1 - 1. Introduction

Page 2 - 2. The Design Transition

AN2602 AN260REV2 For users of the CS4362, the CS4365 is a simple, yet affordable, upgrade to a richer feature set and lowerout-of-band noise performan

Page 3 - Figure 2. CS4362A pinout

AN260AN260REV2 3Location or function changes as denoted in Figure 1 are as follows:• The CS4365 does not support the simultaneous synchronous sample r

Page 4 - Figure 4. CS4365 pinout

AN2604 AN260REV2alog filter gain (if similar output level to the CS4362 is desired).- The mute control pins are high impedance while reset is asserted

Page 5

AN260AN260REV2 5• Pin 42 no longer functions as M3 in stand-alone PCM modes. It is now a dedicated DSD_SCLK pin.Pins which require changes to external

Page 6

AN2606 AN260REV2Table 2. Revision History Release Date ChangesREV1 FEB 2005 Initial ReleaseREV2 JAN 2009 Added text to indicate MUTEC pins of the CS43

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Cirrus-logic AN260 Manuel d'utilisateur

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