CS4271 Datasheet, PDF (43/53 Pages) Cirrus Logic – 24-Bit, 192 kHz Stereo Audio CODEC

CS4271
8.6 ADC Control - Address 06h
7
Reserved
6
Reserved
5
Dither16
4
ADC_DIF
3
MUTEA
2
MUTEB
1
0
HPFDisableA HPFDisableB
8.6.1 Dither for 16-Bit Data (Bit 5)
Function:
When set, this bit activates the Dither for 16-Bit Data feature as described in “Dither for 16-Bit Data”
on page 30.
8.6.2 ADC Digital Interface Format (Bit 4)
Function:
The required relationship between LRCK, SCLK and SDOUT for the ADC is defined by the ADC Dig-
ital Interface Format. The options are detailed in Table 17 and may be seen in Figure 3 and 4.
Table 17. ADC Digital Interface Formats
8.6.3
ADC_DIF
Description
0
Left Justified, up to 24-bit data (default)
1
I²S, up to 24-bit data
ADC Channel A & B Mute (Bits 3:2)
Format
0
1
Figure
3
4
Function:
When this bit is set, the output of the ADC for the selected channel will be muted.
8.6.4 Channel A & B High Pass Filter Disable (Bits 1:0)
Function:
When this bit is set, the internal high-pass filter for the selected channel will be disabled.The current
DC offset value will be frozen and continue to be subtracted from the conversion result. See “High
Pass Filter and DC Offset Calibration” on page 30.
8.7 Mode Control 2 - Address 07h
7
Reserved
6
Reserved
5
Reserved
4
LOOP
3
MUTECA=B
2
FREEZE
1
CPEN
0
PDN
8.7.1 Digital Loopback (Bit 4)
Function:
When this bit is set, an internal digital loopback from the ADC to the DAC will be enabled. Please refer
to “Internal Digital Loopback” on page 30.
8.7.2 AMUTEC = BMUTEC (Bit 3)
Function:
When this function is enabled, the individual controls for AMUTEC and BMUTEC are internally con-
nected through an AND gate prior to the output pins. Therefore, the external AMUTEC and BMUTEC
pins will go active only when the requirements for both AMUTEC and BMUTEC are valid.
DS592F1
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