PCM1602

22

SBAS163

OVER

Oversampling Rate Control

This bit is Read/Write.

Default Value: 0

OVER = 0

64x Oversampling (default)

OVER = 1

128x Oversampling

OVER = 0

32x Oversampling (default)

OVER = 1

64x Oversampling

The OVER bit is used to control the oversampling rate of the delta-sigma DACs. The OVER = 1 setting is

ANALOG OUTPUTS

The PCM1602 includes six independent output channels,

capable of driving 3.1Vp-p typical into a 5k

Ω AC load with

The output amplifiers include an RC continuous-time filter,

which helps to reduce the out-of-band noise energy present

at the DAC outputs due to the noise-shaping characteristics

of the PCM1602’s delta-sigma DACs. The frequency re-

sponse of this filter is shown in Figure 10. By itself, this

FIGURE 10. Output Filter Frequency Response.

1

10

100

1k

10k

100k

10M

1M

20

0

–20

–40

–60

–80

–100

Log Frequency (Hz)

+

OPA337

10

µF

V

COM

PCM1602

15

4

3

1

V

V

CC

2

filter is not enough to attenuate the out-of-band noise to an

acceptable level for most applications. An external low-pass

filter is required to provide sufficient out-of-band noise

rejection. Further discussion of DAC post-filter circuits is

provided in the Applications Information section of this data

sheet.

(pin 15), is brought out for decoupling purposes. This pin is

this pin is to be used to bias external circuitry, a voltage

follower is required for buffering purposes. Figure 11 shows

applications.