CS42435-CMZ Cirrus Logic Inc, CS42435-CMZ Datasheet - Page 27

• Manufacturer Part Number: CS42435-CMZ
• Description: IC,Soundcard Circuits,CMOS,QFP,52PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

DS685F1
5. APPLICATIONS
5.1
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
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
Digital Interface Formats” on page 33
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 I²S, 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
page 32
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
Software and Hardware Mode, respectively. See
settings and options in Software Mode.
Function
for details).
and
Figure 2 on page 12
Table 2. Hardware Configurable Settings
Hardware Mode Feature Summary
Selectable between 256Fs and
All DAC Volume = 0 dB, un-
Default Configuration
High Pass Filter is always
No De-Emphasis applied
All ADC Volume = 0 dB
All ADC’s are enabled
All DAC’s are enabled
Device is powered up
for details.
muted, not inverted
Immediate Change
Immediate Change
Left-Justified
Disabled
enabled
512Fs
N/A
show the recommended connections for the CS42435 in
“Register Description” on page 40
Hardware Control
“MFREQ” pin 3
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for the default register
“System Clocking” on
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see
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Section 5.4
CS42435
Note
“AUX Port
27