TLC5618, TLC5618A

PROGRAMMABLE DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTERS

SLAS156E – JULY 1997 – REVISED SEPTEMBER 1999

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

general function

The TLC5618 uses a resistor string network buffered with an op amp to convert 12-bit digital data to analog

voltage levels (see functional block diagram and Figure 18). The output is the same polarity as the reference

input (see Table 1).

The output code is given by: 2 V

REFIN

CODE

4096

An internal circuit resets the DAC register to all 0s on power up.

_

+

Resistor

String

DAC

5 V

0.1

µF

AGND

VDD

OUT

REFIN

R

R

_

+

×2

DIN

CS

SCLK

Figure 18. TLC5618 Typical Circuit

INPUT

OUTPUT

1111

1111

1111

2 V

REFIN

4095

4096

:

:

1000

0000

0001

2 V

REFIN

2049

4096

1000

0000

0000

2 V

REFIN

2048

4096

+ V

REFIN

0111

1111

1111

2 V

REFIN

2047

4096

:

:

0000

0000

0001

2 V

REFIN

1

4096

0000

0000

0000

0 V