PCM3168APAPR datasheet(54/66 Pages) TI

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PCM3168A

PCM3168A-Q1

SBAS452 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com

ATADx[7:0]

ADC Digital attenuation level setting

Where x = 0 and 1 to 6, corresponding to the ADC channel, ADCx (x = 1 to 6).

Each ADC channel has a digital attenuator function with 20-dB gain. The attenuation level can be

set from 20 dB to –100 dB in 0.5-dB steps, and also can be set to infinite attenuation (mute). The

attenuation level change from current value to target value is performed by increment or

decrement with s-curve response and time set by ATSPAD. While the attenuation level change

sequence is in progress, new processing of an attenuation level change for a new command is

ignored; the new command is overwritten into the command buffer. The last command for an

attenuation level change is performed after the present attenuation level change sequence is

finished.

The attenuation level for each channel can be set individually using the following formula, and the

above table shows attenuation levels for various settings.

Attenuation level (dB) = 0.5 × (ATADx[7:0]DEC – 215), where ATADx[7:0]DEC = 0 through 255

for ATADx[7:0]DEC = 0 through 14, attenuation is set to infinite attenuation (Mute).

ATAD0[7:0] is used to control all channels at the same time with attenuation data of ATAD0[7:0]

+ ATADx[7:0] in decibel number, though maximum level is limited within +20 dB, when ATMDAD

is set to '1'. This scheme provides preset and master volume operation.

Default value: 1101 0111.

ATADx

Decimal

Attenuation level setting

value

1111 1111

255

+20.0 dB

1111 1110

254

+19.5 dB

1111 1101

253

+19.0 dB

...

1101 1000

216

+0.5 dB

1101 0111

215

0 dB, no attenuation (default)

1101 0110

214

–0.5 dB

...

0001 0000

–99.5 dB

0000 1111

–100.0 dB

0000 1110

Mute

...

0000 0000

Mute

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