CS42432-DMZ datasheet(26/59 Pages) CIRRUS

26 / 59 page

DS673F1

CS42432

5. APPLICATIONS

5.1

Overview

The CS42432 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 6 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 6 DAC channels and 6 ADC channels in a Time-Division Multi-

plexed (TDM) interface format. The CS42432 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 “AUX Port

Digital Interface Formats” on page 32 for details.

The CS42432 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 I²S, Left-Justified, Right-Justified interface formats. QSM is not supported for the

ADC). Note: QSM is only available in Software Mode (see “System Clocking” on page 31 for details).

All functions can be configured through software via a serial control port operable in SPI Mode or in I²C

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 CS42432 in

Software and Hardware Mode, respectively. See “Register Description” on page 39 for the default register

settings and options in Software Mode.

Hardware Mode Feature Summary

Function

Default Configuration

Hardware Control

Note

Power Down ADC

All ADC’s are enabled

Power Down DAC

All DAC’s are enabled

Power Down Device

Device is powered up

MCLK Frequency Select

Selectable between 256Fs and

512Fs

“MFREQ” pin 3

see Section 5.4

Freeze Control

N/A

AUX Serial Port Interface Format

Left-Justified

ADC1/ADC2 High Pass Filter Freeze

High Pass Filter is always

enabled

DAC De-Emphasis

No De-Emphasis applied

ADC1/ADC2 Single-Ended Mode

Disabled

DAC Volume Control/Mute/Invert

All DAC Volume = 0 dB, un-

muted, not inverted

ADC Volume Control

All ADC Volume = 0 dB

DAC Soft Ramp/Zero Cross

Immediate Change

ADC Soft Ramp/Zero Cross

Immediate Change

DAC Auto-Mute

Enabled

Table 2. Hardware Configurable Settings

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