Preliminary Technical Data

AD5025/45/65

Table 9. DCEN (Daisy-Chain Enable) Register

(DB1)

(DB0)

Action

0

0

Standalone mode (default)

1

0

DCEN mode

Table 10. 32-Bit Input Shift Register Contents for Daisy-Chain Enable and Reference Set-Up Function

MSB

LSB

DB31 to DB28

DB27

DB26

DB25

DB24

DB23

DB22

DB21

DB20

DB2 to DB19

DB1

DB0

X

1

0

0

0

X

X

X

X

X

1/0

1/0

Don’t cares

Command bits (C3 to C0)

Address bits (A3 to A0)

Don’t cares

DCEN

register

Table 11. Modes of Operation

DB9

DB8

Operating Mode

0

0

Normal operation

Power-down modes

0

1

1 kΩ to GND

1

0

100 kΩ to GND

1

1

Three-state

Table 12. 32-Bit Input Shift Register Contents for Power-Up/Power-Down Function

MSB

LSB

DB31 to

DB28

DB27

DB26

DB25

DB24

DB23

DB22

DB21

DB20

DB10 to

DB19

DB9

DB8

DB4 to

DB7

DB3

DB2

DB1

DB0

X

0

1

0

0

X

X

X

X

X

PD1

PD0

X

X

X

DAC B

DAC A

Don’t

Command bits (C2 to C0)

Address bits (A3 to A0)—

Don’t

Power-down

Don’t

Power-down/power-up channel selection—

cares

don’t cares

cares

mode

cares

set bit to 1 to select

Figure 47. Output Stage During Power-Down

Rev. PrB | Page 27 of 3

3