TLC7226C, TLC7226I, TLC7226M

QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS

SLAS060E − JANUARY 1995 − REVISED JANUARY 2003

9

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

interface logic information (continued)

17

16

15

A0

A1

WR

To Latch A

To Latch B

To Latch C

To Latch D

Figure 6. Input Control Logic

unipolar output operation

The unipolar output operation is the basic mode of operation for each channel of the TLC7226, with the output

to AGND to prevent parasitic transistor turnon. Connections for the unipolar output operation are shown in

Figure 7. Transfer values are shown in Table 3.

_

+

DAC A

_

+

DAC B

_

+

DAC C

_

+

DAC D

4

REF

2

1

20

19

OUTA

OUTB

OUTC

OUTD

Figure 7. Unipolar Output Circuit

LSB

MSB

DAC LATCH CONTENTS

ANALOG OUTPUT

) V

ref

255

256

1111

1111

) V

ref

129

256

1000

0001

1000

0000

) V

ref

128

256

+)

V

ref

2

0111

1111

) V

ref

127

256

0000

0001

) V

ref

1

256

0000

0000

0 V

NOTE A. 1 LSB

+ V

ref

2–8

+ V

ref

1

256

Table 3. Unipolar Code