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TLC7226IDWR Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TLC7226IDWR
Description  QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TLC7226IDWR Fiches technique(HTML) 8 Page - Texas Instruments

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TLC7226C, TLC7226I, TLC7226M
QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS
SLAS060E − JANUARY 1995 − REVISED JANUARY 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
AGND bias for positive output offset (continued)
_
+
DAC A
AGND
DGND
TLC7226†
Vref
OUTA
4
18
2
6
3
VDD
5
VSS
VI
Vbias
† Digital inputs omitted for clarity.
Figure 5. AGND Bias Circuit
interface logic information
Address lines A0 and A1 select which DAC accepts data from the input port. Table 2 shows the operations of
the four DACs. Figure 6 shows the input control logic. When the WR signal is low, the input latches of the
selected DAC are transparent and the output responds to activity on the data bus. The data is latched into the
addressed DAC latch on the rising edge of WR. While WR is high, the analog outputs remain at the value
corresponding to the data held in their respective latches.
Table 2. Function Table
CONTROL INPUTS
OPERATION
WR
A1
A0
OPERATION
H
L
L
L
L
X
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
No operation
Device not selected
DAC A transparent
DAC A latched
DAC B transparent
DAC B latched
DAC C transparent
DAC C latched
DAC D transparent
DAC D latched
L = low,
H = high,
X = irrelevant


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