AD1803

DAC/ADC LEVEL CONTROL REGISTER

Address

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x46

DAM

0

0

DAL4

DAL3

DAL2

DAL1

DAL0

ADM

0

ADS

ADG20

ADL3

ADL2

ADL1

ADL0

0x8080

This register is forced to its default only when power is first applied to the AD1803.

The states of Bit ADS, Bit ADG20, and Bit ADL3 to Bit ADL0 in this register must not be changed while an ADC calibration is in progress if

the analog codec of the AD1803 is in use (see Bit APDN in Register 0x3E and Bit ADCAL in Register 0x5C).

Bit Name

Description

DAM

DAC Mute.

0 = DAC output enabled.

1 = DAC output muted (forced to midscale) (default).

DAL4 to DAL0

DAC Attenuation Level Select. Least significant bit represents −1.5 dB. This attenuation is valid when the AD1803’s analog

codec is used with the digital codec of the AD1803 (Bit ACSEL in Register 0x5C = 0).

00000 = +12.0 dB gain (default).

11111 = −34.5 dB attenuation.

ADM

ADC Mute.

0 = ADC samples passed.

1 = ADC samples substituted with midscale (0) data (default).

ADS

Analog ADC Input Select. The state of this bit has no effect on ADC behavior unless Bit ACSEL in Register 0x5C is set to 0

(default). This selects the analog codec of the AD1803 to partner with the digital codec of the part. If this bit is used to select

the MIC input as the ADC input of the AD1803, Pin 15 must first be assigned to serve as this MIC input rather than its default

role as a GPIO pin. This is done by setting Bit GPMIC in Register 0x5E to 1.

0 = Pin 16 (Rx input) selected as AD1803 ADC input source (default).

1 = Pin 15 (MIC input) selected as AD1803 ADC input source (requires GPMIC in Register 0x5E set to 1).

ADG20

AD1803 Analog ADC 20 dB Gain Enable. The state of this bit has no effect on ADC behavior unless Bit ACSEL in Register 0x5C is

set to 0 (default). This selects the analog codec to partner with the digital codec. Total ADC gain is the summation due to this

bit and Bit ADL3 to Bit ADL0.

0 = 0 dB gain (default).

1 = 20 dB gain.

ADL3 to ADL0

AD1803 ADC Gain Level Select. The state of these bits has no effect on ADC behavior unless Bit ACSEL in Register 0x5C is set to

0 (default). This selects the AD1803’s analog codec to partner the AD1803’s digital codec.

0000 = 0.0 dB gain (default).

1111 = 22.5 dB gain.

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