PCM3060PW.B datasheet(36/48 Pages) TI2

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PCM3060

SLAS533B – MARCH 2007 – REVISED MARCH 2008

B15

B14

B13

B12

B11

B10

AT117

AT116

AT115

AT114

AT113

AT112

AT111

AT110

B15

B14

B13

B12

B11

B10

AT127

AT126

AT125

AT124

AT123

AT122

AT121

AT120

AT1x[7:0]: Digital Attenuation Level Setting (ADC)

where x = 1 or 2, corresponding to the ADC output L-ch part of DOUT (x = 1) or R-ch part of DOUT (x = 2).

Default value: 1101 0111b

AT1x[7:0]

DECIMAL VALUE

ATTENUATION LEVEL SETTING

1111 1111b

255

20 dB

1111 1110b

254

19.5 dB

1111 1101b

253

19 dB

1101 1000b

216

0.5 dB

1101 0111b

215

0 dB, no attenuation (default)

1101 0110b

214

–0.5 dB

0001 0000b

–99.5 dB

0000 1111b

–100 dB

0000 1110b

Mute

0000 0000b

Mute

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

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

the current value to the target value is performed by incrementing or decrementing one by 0.5-dB step at the

timing of zero-cross detection on the input signal which is sampled for every 1/fS time interval, or for every 8/fS

time interval if the zero-cross detection mode is disabled by ZCDD setting. If a zero-crossing is not detected for

512/fS, actual level change is done for every 1/fS time interval until a zero-crossing is detected again. While the

attenuation level change sequence is in progress, new commands for attenuation level change are not

processed, but the new command overwrites the previous command in the command buffer. The last command

for 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

× (AT1x[7:0]

DEC – 215), where AT1x[7:0]DEC = 0 through 255 for AT1x[7:0]DEC = 0

through 14, the level is set to infinite attenuation (mute).

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