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AN229

Application Note

TRANSITIONING FROM THE CS8405A TO THE CS8406

by Sean Davis

1. Introduction

The CS8406 was designed as a pin and function compatible update for the CS8405A to add

192 kHz sample rate capability and offer over 1/3 less total power consumption than the

CS8405A. This document outlines the considerations that need to be accounted for when mak-

ing the transition. Please refer to the latest revision of each part’s datasheet for a detailed

description of part operation.

2. Power Supply

The VD+ supply of the CS8405A operates only at 5.0 V ±10%, while the VD supply of the

CS8406 operates at either 3.3 V or 5.0 V ±5%. However, when the CS8406 is operated with

VD = 5.0 V, certain conditions apply:

 V

(Min) for the CS8406 = 2.75 V. V

(Min) for the CS8405A = 2.0 V.

 In power down mode, it is recommended that all inputs be driven low to minimize current

consumption.

3. Software Mode

Shown in Table 2 on page 2 is a list of pin numbers and their corresponding pin names for both

parts when operated in Software mode. The register settings for the CS8405A are compatible

with the CS8406.

4. Hardware Mode

Shown in Table 3 on page 3 is a list of pin numbers and their corresponding pin names for both

parts when operated in Hardware mode.

5. CS8406 Test Pins

The CS8406 has several pins labeled as TEST. These pins are unused inputs in either Software

or Hardware mode. It is recommended that these pins be tied to a supply (VL or GND) to mini-

mize leakage current.

When transitioning from the CS8405A to the CS8406, some of the TEST pins on the CS8406

may be left floating due to corresponding pins on the CS8405A being labeled as no connects.

The CS8406 will operate the same if these pins are left floating, however current consumption

from VL will increase by 25 μA per pin that is left floating. As the CS8406 consumes much less

current than the CS8405A, this should not be a concern to the user.

APRIL ‘09

AN229REV2

1 2 3 4

Indice de contenidos

Pagina 1 - Application Note

Pagina 2 - 6. Output Resistance

AN22926. Output ResistanceThe typical output resistance of the transmitter pins changed from the CS8405A to the CS8406.The value of the external serie

Pagina 3

AN2293Pin Number CS8405A Pin Name CS8406 Pin Name Differences2 VL2+ TEST See “CS8406 Test Pins” on page 1.6 VD+ VD See “Power Supply” on page 1.7 DGND

Pagina 4 - 7. Revision History

AN22947. Revision History. Revision ChangesREV1 Initial ReleaseREV2 Added “Output Resistance” on page 2Contacting Cirrus Logic SupportFor all product

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