TLC7528C, TLC7528E, TLC7528I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS062B – JANUARY 1987 – REVISED MARCH 2000
PRINCIPLES OF OPERATION
The digital inputs of these devices provide TTL compatibility when operated from a supply voltage of 5 V. These
devices can operate with any supply voltage in the range from 5 V to 15 V; however, input logic levels are not
TTL compatible above 5 V.
R
REFA
2R
2R
2R
2R
2R
RFB
S1
S2
S3
S8
OUTA
AGND
RFBA
R
R
DACA Data Latches and Drivers
Figure 1. Simplified Functional Circuit for DACA
RFBA
RFB
R
REFA
I
256
IIkg
COUT
AGND
OUTA
Figure 2. TLC7528 Equivalent Circuit, DACA Latch Loaded With 11111111
MODE SELECTION TABLE
DACA/DACB
L
H
X
X
L = low level,
CS
L
L
H
X
WR
L
L
X
H
DACA
Write
Hold
Hold
Hold
DACB
Hold
Write
Hold
Hold
H = high level,
X = don’t care
6
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