Cirrus-logic CS53L21 User Manual download pdf (Page 51)

DS700PP1 51

CS53L21

Function:

The level of ADCX can be adjusted in 1.0 dB increments as dictated by the ADCx Soft and Zero Cross bits

(SOFTx & ZCROSSx) from 0 to -96 dB. Levels are decoded in two’s complement, as shown in the table

above.

Note: When the ALC is enabled, the Attenuator and PGA volume is automatically controlled and should

not be adjusted manually.

6.11 ADCx Mixer Volume Control: ADCA (Address 0Eh) & ADCB (Address 0Fh)

Note: The SPE_ENABLE bit in reg09h must be set to 1 to enable function control in this register.

ADCX Mixer Channel Mute (MUTE_ADCMIXX)

Default: 1

0 - Disabled

1 - Enabled

Function:

The ADC channel X input to the output mixer will mute when enabled. The muting function is affected by

the SPEX Soft and Zero Cross bits (SPEX_SZC[1:0]).

ADCX Mixer Volume Control (ADCMIXX_VOL[6:0])

Default = 000 0000

Function:

The level of the ADCX input to the output mixer can be adjusted in 0.5 dB increments as dictated by the

SPEX Soft and Zero Cross bits (SPE_SZC[1:0]) from +12 to -51.5 dB. Levels are decoded as shown in the

table above.

6.12 Channel Mixer (Address 18h)

Note: The SPE_ENABLE bits in reg09h must be set to 1 to enable function control in this register.

Channel Mixer (ADCx[1:0])

Default: 00

7 6543210

MUTE_ADCMIXx ADCMIXx_VOL6 ADCMIXx_VOL5 ADCMIXx_VOL4 ADCMIXx_VOL3 ADCMIXx_VOL2 ADCMIXx_VOL1 ADCMIXx_VOL0

Binary Code Volume Setting

001 1000 +12.0 dB

··· ···

000 0000 0 dB

111 1111 -0.5 dB

111 1110 -1.0 dB

··· ···

001 1001 -51.5 dB

76543210

Reserved Reserved Reserved Reserved ADCA1 ADCA0 ADCB1 ADCB0

ADCA[1:0] SDOUT ADCB[1:0] SDOUT

00 L 00 R

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 65 66

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Cirrus-logic CS53L21 User Manual Page 51