Cirrus-logic CS4271 User Manual download pdf (Page 43)

CS4271

DS592F1 43

8.6 ADC Control - Address 06h

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.

8.6.3 ADC Channel A & B Mute (Bits 3:2)

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

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.

76543210

Reserved Reserved Dither16 ADC_DIF MUTEA MUTEB HPFDisableA HPFDisableB

Table 17. ADC Digital Interface Formats

ADC_DIF Description Format Figure

0 Left Justified, up to 24-bit data (default) 0 3

S, up to 24-bit data

76543210

Reserved Reserved Reserved LOOP MUTECA=B FREEZE CPEN PDN

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 52 53

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Cirrus-logic CS4271 User Manual Page 43