ADS7253 datasheet(35/73 Pages) TI2

35 / 73 page

ADS8354, ADS7854, ADS7254

www.ti.com

SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014

8.5.2.2 REFDAC Registers (REFDAC_A and REFDAC_B)

The REFDAC registers, bit functions, and resolution information are described in this section.

Figure 88. REFDAC_X Bit Functions

WRITE/READ

ADDR1

ADDR0

Table 6. REFDAC Registers Field Descriptions

Bit

Field

Type

Reset

Description

WRITE/READ

These bits select the configurable register address.

1001 = Select this combination to write to the REFDAC_A

R/W

ADDR1

R/W

1010 = Select this combination to write to the REFDAC_B

ADDR0

R/W

Data to program the individual DAC output voltage.

Note: These bits are valid only for bits 15:12 = 1001 or bits

11:3

D[8:0]

R/W

15:12 = 1010.

Table 7 shows the relationship between the REFDAC_x

programmed value and the DAC_x output voltage.

2:0

R/W

This bit must be set to 0 (default)

Table 7. REFDAC Settings

REFDAC_x VALUE (Bits 11:3 in Hex)

B[2:0]

Typical DAC_x OUPTUT VOLTAGE (V)(1)

1FF (default)

000

2.5000

1FE

000

2.4989

1FD

000

2.4978

—

1D7

000

2.45

—

1AE

000

2.40

—

186

000

2.35

—

15D

000

2.30

—

134

000

2.25

—

10C

000

2.20

—

0E3

000

2.15

—

0BA

000

2.10

—

091

000

2.05

—

069

000

2.00

—

064 to 000

000

Do not use

(1)

Actual output voltage may vary by a few millivolts from the specified value. To obtain the desired output voltage, TI recommends starting

with the specified register setting and then experimenting with five codes on either side of the specified register setting.

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