Data Sheet

AD5504

Rev. B | Page 17 of 20

Table 10. Control Register Functions

DB15

DB14

DB13

DB12

DB11

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB01

R/W

1

1

1

0

0

0

0

0

C6

C5

C4

C3

C2

C1

C0

1

Read-only bit. This bit should be 0 when writing to the control register.

Table 11. Control Register Function Bit Descriptions

Bit No.

Bit Name

Description

DB0

C0

C0 = 0: the device is not in thermal shutdown mode.

C0 = 1: the device is in thermal shutdown mode.

DB1

C1

C1 = 0: reserved. This bit should be 0 when writing to the control register.

DB2

C21

C2 = 0: DAC Channel A power-down (default).

C2 = 1: DAC Channel A power-up.

DB3

C31

C3 = 0: DAC Channel B power-down (default).

C3 = 1: DAC Channel B power-up.

DB4

C41

C4 = 0: DAC Channel C power-down (default).

C4 = 1: DAC Channel C power-up.

DB5

C51

C5 = 0: DAC Channel D power-down (default).

C5 = 1: DAC Channel D power-up.

DB6

C6

C6 = 0: outputs connected to AGND through a 20 kΩ resistor (default).

C6 = 1: outputs are three-stated.

1

If Bit C2 to Bit C5 are set to 0, the part is placed in power-down mode.

WRITE N

WRITE N + 1

WRITE TO

CONTROL REGISTER

NOP

WRITE TO

CONTROL REGISTER

WRITE TO

DAC REGISTER

WRITE N + 2

WRITE TO

CONTROL REGISTER

WRITE TO

CONTROL REGISTER

NOP

WRITE TO

CONTROL REGISTER

WRITE TO

CONTROL REGISTER

WRITE TO

DAC REGISTER

Figure 18. Control Register Write Sequences