PCM1795DBRG4.B datasheet(45/68 Pages) TI2

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0.0005

0.0004

0.0003

0.0002

0.0001

0.0002

0.0003

0.0004

0.0005

Frequency( f )

´ S

0.2

0.5

0.1

0.3

0.4

PassbandRipple

SharpRoll-Off

Frequency( f )

´ S

0.2

0.6

0.1

0.3

0.4

0.5

TransitionCharacteristics

SlowRoll-Off

PCM1795

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SLES248A – MAY 2009 – REVISED MARCH 2015

8.2.2.2.5.1

FMT[2:0]: Audio Data Format Selection

Default value: 000

Table 34. FMT[2:0]

FMT[2:0]

AUDIO DATA FORMAT SELECTION

000

16-bit right-justified format

001

32-bit right-justified format

010

24-bit right-justified format (default)

Other

N/A

8.2.2.2.5.2

OS[1:0]:

ΔΣ Modulator Oversampling Rate Selection

Default value: 00

Table 35. OS[1:0]

OS[1:0]

OPERATION SPEED SELECTION

8 times WDCK (default)

4 times WDCK

16 times WDCK

Reserved

The effective oversampling rate is determined by the oversampling performed by both the external digital filter

and the

ΔΣ modulator. For example, if the external digital filter is 8× oversampling, and OS[1:0] = 00 is selected,

then the

ΔΣ modulator oversamples by 8×, resulting in an effective oversampling rate of 64×. The 16× WDCK

oversampling rate is not available above a 100-kHz sampling rate. If the oversampling rate selected is 16×

WDCK, the system clock frequency must be over 256 fS.

8.2.2.3 Application Curves

Figure 61. Amplitude vs Frequency

Figure 62. Amplitude vs Frequency

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