TLC7225C, TLC7225I

QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS

SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

AGND bias for positive output offset

The TLC7225 AGND terminal can be biased above or below the system ground terminal, DGND, to provide an

offset-zero analog-output voltage level. Figure 10 shows a circuit configuration to achieve this for channel A of

V

O +

V

bias )

D

A

V

I

_

+

DAC A

AGND

DGND

TLC7225†

Vref

VO(OUTA)

5

22

2

7

3

VDD

6

VSS

VI

Vbias

† Digital inputs omitted for clarity.

Figure 10. AGND Bias Circuit

specified operation. Since the AGND terminal is common to all four DACs, this method biases up the output

to DGND.