Datasheet

PCM3008
SLAS332 – APRIL 2001
12
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function control
The PCM3008 has the following functions which are controlled by PDAD (pin 13), PDDA (pin 14), DEM0 (pin
6) and DEM1 (pin 7).
power-down control
PDAD
: ADC power-down control pin places the ADC portion in the lowest power consumption mode. The ADC
operation is stopped by disabling the clock and bias to the ADC portion, and DOUT is forced to zero during ADC
power-down mode. Figure 7 illustrates the ADC DOUT response for ADC power-down ON/OFF. This does not
affect the DAC operation.
PDAD ADC OPERATION MODE
Low ADC power down mode enable
High ADC power down mode disable
PDDA: DAC power-down control pin places the DAC portion in the lowest power consumption mode. The DAC
operation is stopped by disabling the clock and bias to the DAC portion, and V
OUT
is forced to V
COM
(0.5 V
CC
)
during DAC power-down mode. Figure 7 illustrates the DAC V
OUT
response for DAC power-down ON/OFF. This
does not affect the ADC operation.
PDDA DAC OPERATION MODE
Low DAC power down mode enable
High DAC power down mode disable
PDAD = low and PDDA = low places PCM3008 into reset state and either PDAD = high or PDDA = high returns
PCM3008 to operational state.
de-emphasis control
DEM1, DEM0: DAC de-emphasis control pins select the de-emphasis mode as shown below.
DEM1 DEM0 DE-EMPHASIS MODE
Low Low De-emphasis 44.1 kHz ON
Low High De-emphasis OFF
High Low De-emphasis 48 kHz ON
High High De-emphasis 32 kHz ON