TLC7524C, TLC7524E, TLC7524I

8BIT MULTIPLYING DIGITALTOANALOG CONVERTERS

SLAS061D − SEPTEMBER 1986 − REVISED JUNE 2007

5

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

voltage-mode operation

It is possible to operate the current-multiplying DAC in 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 1 is an example of a current-multiplying DAC, which is operated in voltage

mode.

R

1

0

REF (Analog Output Voltage)

OUT2

OUT1 (Fixed Input Voltage)

R

R

R

2R

2R

2R

2R

Figure 1. Voltage Mode Operation

The relationship between the fixed-input voltage and the analog-output voltage is given by the following

equation:

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 REF

VDD = 5V,

OUT1 = 2.5V,

OUT2 at GND,

TA = +25°C

1

LSB