TLC7225C, TLC7225I

QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS

SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001

13

POST OFFICE BOX 655303

APPLICATION INFORMATION

AGND bias for direct bipolar-output operation

The TLC7225 can be used in bipolar operation without adding additional external operational amplifiers by

direct bipolar output with no additional components. The transfer values are shown in Table 4.

_

+

DAC A

AGND

DGND

TLC7225†

REFA (Vref = 5 V)

OUTA

5

22

2

7

3

VDD = 10 to 15 V

6

VSS

† Digital inputs omitted for clarity.

– 5 V

Output range

(5 V to – 5 V)

Figure 9. AGND Bias for Direct Bipolar-Output Operation

LSB

MSB

DAC LATCH CONTENTS

ANALOG OUTPUT

) V

ref

127

128

1111

1111

) V

ref

1

128

1000

0001

1000

0000

–V

ref

128

128

+* V

ref

0111

1111

0000

0001

* V

ref

127

128

0000

0000

0 V

Table 4. Bipolar (Offset Binary) Code

* V

ref

1

128