AD1803 데이터 시트보기 (PDF) - Analog Devices

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AD1803

Modem/Telephony Codec

Analog Devices 

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

DAM

DAL4 to DAL0

ADM

ADS

ADG20

ADL3 to ADL0

Description

DAC Mute.

0 = DAC output enabled.

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

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.

ADC Mute.

0 = ADC samples passed.

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

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).

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.

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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