PCM1608 datasheet(28/46 Pages) TI2

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PCM1608

SBAS164B – DECEMBER 2000 – REVISED JULY 2005

B15

B14

B13

B12

B11

B10

R/W

IDX6

IDX5

IDX4

IDX3

IDX2

IDX1

IDX0

OVER

GPOE

GPO6

GPO5

GPO4

GPO3

GPO2

GPO1

R/W – Read/Write Mode Select

When R/W = 0, a write operation is performed.

When R/W = 1, a read operation is performed.

Default value: 0

OVER – Oversampling Rate Control

This bit is read/write.

Default value: 0

System clock rate = 256 fS, 384 fS, 512 fS, or 768 fS:

OVER = 0

× oversampling (default)

OVER = 1

128

× oversampling

System clock rate = 128 f

S or 192 fS:

OVER = 0

× oversampling (default)

OVER = 1

× oversampling

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

recommended when the oversampling rate is 192 kHz (system clock rate is 128 fS or 192 fS).

GPOE – General-Purpose Output Enable

This bit is read/write.

Default value: 0

GPOE = 0

General-purpose outputs disabled (default)

Pins default to zero-flag function (ZERO1 through ZERO6).

GPOE = 1

General-purpose outputs enabled

Data written to GPO1 through GPO6 appears at the corresponding pins.

GPOx – General-Purpose Logic Output

Where: x = 1 through 6, corresponding pins GPO1 through GPO6.

These bits are read/write.

Default value: 0

GPOx = 0

Set GPOx to 0 (default)

GPOx = 1

Set GPOx to 1

The general-purpose output pins, GPO1 through GPO6, are enabled by setting GPOE = 1. These pins are used

as general-purpose outputs for controlling user-defined logic functions. When general-purpose outputs are

disabled (GPOE = 0), they default to the zero-flag function, ZERO1 through ZERO6.

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