ADS7891

SLAS410 − DECEMBER 2003

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12

t(acq) + 60 ns

A_PWD

BUSY

SAMPLE

(Internal)

NAP

(Internal Active High)

NOTE: The SAMPLE (Internal) signal is generated as described in the Sampling and Conversion

Start section.

Figure 10. Device Operation While A_PWD is Toggling

POWERDOWN/RESET

PWD/RST.

During this period the output code is 3F80 (hex) to indicate that the device is in the reset phase. The

the first four conversions after a power-up (see Figure 11) or an end of reset (see Figure 12). The device is

initialized during the first four conversions.

Power Down

Phase

11 1111 1000 0000

12

3

4

5

PWD/RST

BUSY

D13−D0

td13

tw7

First 4 Invalid Conversions

Valid Conversions

RESET Phase

Invalid Data

Valid Data

Figure 11. Device Power Down

11 1111 1000 0000

12

3

4

5

PWD/RST

BUSY

D13−D0

tw6

First 4 Invalid Conversions

Valid Conversions

RESET Phase

Invalid Data

Valid Data

45 ns

Figure 12. Device Reset