TLC7528C, TLC7528E, TLC7528I

DUAL 8BIT MULTIPLYING

DIGITALTOANALOG CONVERTERS

SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

voltage-mode operation

It is possible to operate the current multiplying D/A converter of these devices in a voltage mode. In the voltage

mode, a fixed voltage is placed on the current output terminal. The analog output voltage is then available at

the reference voltage terminal. Figure 11 is an example of a current multiplying D/A that operates in the voltage

mode.

2R

2R

2R

“0”

“1”

2R

RR

R

R

Out (Fixed Input Voltage)

AGND

REF

(Analog Output Voltage)

Figure 11. Voltage-Mode Operation

The following equation shows the relationship between the fixed input voltage and the analog output voltage:

Where:

D = digital input code converted to decimal

In voltage-mode operation, these devices meet the following specification:

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

Linearity error at REFA or REFB

VDD = 5V,

OUTA or OUTB at 2.5V,

TA = +25°C

1

LSB