TLC7528C, TLC7528E, TLC7528I

DUAL 8BIT MULTIPLYING

DIGITALTOANALOG CONVERTERS

SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008

6

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

The digital inputs of these devices provide TTL compatibility when operated from a supply voltage of 5V. These

devices can operate with any supply voltage in the range from 5V to 15V; however, input logic levels are not

TTL-compatible above 5V.

DACA Data Latches and Drivers

REFA

AGND

OUTA

RFBA

RFB

R

R

R

2R

2R

S8

2R

S3

2R

S2

S1

2R

Figure 1. Simplified Functional Circuit for DACA

R

I

256

OUTA

RFBA

RFB

COUT

IIkg

AGND

REFA

Figure 2. TLC7528 Equivalent Circuit, DACA Latch Loaded With 11111111

MODE SELECTION TABLE

DACA/DACB

CS

WR

DACA

DACB

L

H

X

X

L

L

H

X

L

L

X

H

Write

Hold

Hold

Hold

Hold

Write

Hold

Hold

L = low level,

H = high level,

X = don’t care