TLC7628C Datasheet, PDF (9/10 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7628C, TLC7628E, TLC7628I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS063A – APRIL 1989 – REVISED MAY 1995
PRINCIPLES OF OPERATION
Table 1. Mode Selection Table
DACA/DACB CS WR DACA DACB
L
L L Write Hold
H
L L Hold Write
X
H X Hold Hold
X
X H ^Hold Hold
L = low level, H = high level, X = don’t care
Table 2. Unipolar Binary Code
DAC LATCH CONTENTS
(see Note 7 )
MSB
LSB
ANALOG OUTPUT
11111111
10000001
10000000
01111111
00000001
00000000
–VI (255/256)
–VI (129/256)
–VI (128/256) = – Vi /2
– VI (127/256)
– VI (1/256)
– VI (0/256) = 0
NOTES: 7. 1 LSB = (2 ^{– 8)VI}
8. 1 LSB = (2 ^{– 7)VI}
Table 3. Bipolar (Offset Binary) Code
DAC LATCH CONTENTS
(see Note 8)
MSB
LSB
ANALOG OUTPUT
11111111
10000001
10000000
01111111
00000001
00000000
VI (127/128)
VI (1/128)
0V
– VI (1/128)
– VI (127/128)
– VI (128/128)
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