TLC5617, TLC5617A

PROGRAMMABLE DUAL 10-BIT DIGITAL-TO-ANALOG CONVERTERS

SLAS151B – JULY 1997 – REVISED MARCH 2000

11

POST OFFICE BOX 655303

APPLICATION INFORMATION

general function

The TLC5617 uses a resistor string network buffered with an op amp to convert 10-bit digital data to analog

voltage levels (see functional block diagram and Figure 17). The output of the TLC5617 is the same polarity

as the reference input (see Table 1).

The output code is given by: 2 V

REFIN

CODE

1024

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 17. TLC5617 Typical Operating Circuit

INPUT†

OUTPUT

1111

1111

11(00)

2 V

REFIN

1023

1024

:

:

1000

0000

01(00)

2 V

REFIN

513

1024

1000

0000

00(00)

2 V

REFIN

512

1024

+ V

REFIN

0111

1111

11(00)

2 V

REFIN

511

1024

:

:

0000

0000

01(00)

2 V

REFIN

1

1024

0000

0000

00(00)

0 V

† A 10-bit data word with two sub-LSB 0s must be written since the DAC input

latch is 12 bits wide.