Preliminary Technical Data

AD5724R/AD5734R/AD5754R

Rev. PrC | Page 27 of 32

INPUT REGISTER

The input register is 24 bits wide and consists of a read/write bit, a reserved bit, three register select bits, three DAC address bits, and 12-

/14-/16 data bits. The register data is clocked in MSB first on the SDIN pin. Table 18 shows the register format while Table 19 describes

the function of each bit in the register. All registers are read/write registers.

Table 18. Input Register Format

MSB

LSB

DB23

DB22

DB21

DB20

DB19

DB18

DB17

DB16

DB15 to DB0

R/W

0

REG2

REG1

REG0

A2

A1

A0

DATA

Table 19. Input Register Bit Functions

Bit Mnemonic

Description

R/W

Indicates a read from or a write to the addressed register.

REG2, REG1, REG0

Used in association with the address bits to determine if a write operation is to the data register, output range

select register, power control register or control register.

REG2

REG1

REG0

Function

0

0

0

Data Register

0

0

1

Output Range Select Register

0

1

0

Power Control Register

0

1

1

Control Register

A2, A1, A0

These bits are used to decode the DAC channels.

A2

A1

A0

Channel Address

0

0

0

DAC A

0

0

1

DAC B

0

1

0

DAC C

0

1

1

DAC D

1

0

0

All Four DACs

DB15 to DB0

Data bits.

DATA REGISTER

The data register is addressed by setting the three REG bits to 000. The DAC address bits select the DAC channel where the data transfer

is to take place (see Table 19). The data bits are in positions DB15 to DB0 for the AD5754R (see Table 20), DB15 to DB2 for the AD5734R

(see Table 21), and DB15 to DB4 for the AD5724R (see Table 22).

Table 20. Programming the AD5754R Data Register

MSB

LSB

REG2

REG1

REG0

A2

A1

A0

DB15 to DB0

0

0

0

DAC Address

16-Bit DAC Data

Table 21. Programming the AD5734R Data Register

MSB

LSB

REG2

REG1

REG0

A2

A1

A0

DB15 to DB2

DB1

DB0

0

0

0

DAC Address

14-Bit DAC Data

X

X

Table 22. Programming the AD5724R Data Register

MSB

LSB

REG2

REG1

REG0

A2

A1

A0

DB15 to DB4

DB3

DB2

DB1

DB0

0

0

0

DAC Address

12-Bit DAC Data

X

X

X

X