TLC7628CN datasheet(9/18 Pages) TI1

Part #	TLC7628CN

Description	DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTER

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TLC7628C

DUAL 8BIT MULTIPLYING

SLAS063B − APRIL 1989 − REVISED MARCH 2007

9

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

Table 1. Mode Selection Table

DACA/DACB

CS

WR

DACA

DACB

L

H

X

L

H

X

L

X

H

Write

Hold

Write

Hold

L = low level,

H = high level,

X = don’t care

Table 2. Unipolar Binary Code

Table 3. Bipolar (Offset Binary) Code

DAC LATCH CONTENTS

(see Note 7 )

ANALOG OUTPUT

DAC LATCH CONTENTS

(see Note 8)

ANALOG OUTPUT

MSB

LSB

ANALOG OUTPUT

MSB

LSB

ANALOG OUTPUT

1 1 1 1 1 1 1 1

1 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0

0 1 1 1 1 1 1 1

0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0

−VI (255/256)

−VI (129/256)

−VI (128/256) = − Vi /2

−VI (127/256)

−VI (1/256)

−VI (0/256) = 0

1 1 1 1 1 1 1 1

1 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0

0 1 1 1 1 1 1 1

0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0

VI (127/128)

VI (1/128)

0 V

−VI (1/128)

−VI (127/128)

−VI (128/128)

NOTES:

7. 1 LSB = (2 − 8)VI

8. 1 LSB = (2 − 7)VI

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