CS42435 Datasheet, PDF(27/58 Page) Cirrus Logic – 108 dB, 192 kHz 4-In, 8-Out TDM CODEC

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CS42435 Datasheet, PDF (27/58 Pages) Cirrus Logic – 108 dB, 192 kHz 4-In, 8-Out TDM CODEC

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5. APPLICATIONS

CS42435

5.1 Overview

The CS42435 is a highly integrated mixed signal 24-bit audio CODEC comprised of 4 analog-to-digital con-

verters (ADC) implemented using multi-bit delta-sigma techniques and 8 digital-to-analog converters (DAC)

also implemented using multi-bit delta-sigma techniques.

Other functions integrated within the CODEC include independent digital volume controls for each DAC, dig-

ital de-emphasis filters for the DAC, digital volume control with gain on each ADC channel, ADC high-pass

filters, and an on-chip voltage reference.

The serial audio interface ports allow up to 8 DAC channels and 6 ADC channels in a Time-Division Multi-

plexed (TDM) interface format. The CS42435 features an Auxiliary Port used to accommodate an additional

two channels of PCM data on the ADC_SDOUT data line in the TDM digital interface format. See âAUX Port

Digital Interface Formatsâ on page 33 for details.

The CS42435 operates in one of three oversampling modes based on the input sample rate. Mode selection

is determined automatically based on the MCLK frequency setting. Single-Speed Mode (SSM) supports in-

put sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed Mode (DSM) supports

input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed Mode (QSM) sup-

ports input sample rates up to 200 kHz and uses an oversampling ratio of 32x (Note: QSM for the ADC is

only supported in the IÂ²S, Left-Justified, Right-Justified interface formats. QSM is not supported for the ADC

in the TDM interface format). Note: QSM is only available in Software Mode (see âSystem Clockingâ on

page 32 for details).

All functions can be configured through software via a serial control port operable in SPI Mode or in IÂ²C

Mode. A Hardware, Stand-Alone Mode is also available, allowing configuration of the CODEC on a more

limited basis. See Table 2 for the default configuration in Hardware Mode.

Figure 1 on page 11 and Figure 2 on page 12 show the recommended connections for the CS42435 in

Software and Hardware Mode, respectively. See âRegister Descriptionâ on page 40 for the default register

settings and options in Software Mode.

Function

Power Down ADC

Power Down DAC

Power Down Device

MCLK Frequency Select

Freeze Control

AUX Serial Port Interface Format

ADC1 High Pass Filter Freeze

DAC De-Emphasis

ADC1 Single-Ended Mode

DAC Volume Control/Mute/Invert

ADC Volume Control

DAC Soft Ramp/Zero Cross

ADC Soft Ramp/Zero Cross

Hardware Mode Feature Summary

Default Configuration

Hardware Control

All ADCâs are enabled

All DACâs are enabled

Device is powered up

Selectable between 256Fs and

512Fs

âMFREQâ pin 3

N/A

Left-Justified

High Pass Filter is always

enabled

No De-Emphasis applied

Disabled

All DAC Volume = 0 dB, un-

muted, not inverted

All ADC Volume = 0 dB

Immediate Change

Table 2. Hardware Configurable Settings

Note

see Section 5.4

DS685F1

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