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AD7226KRZ Arkusz danych(PDF) 6 Page - Analog Devices

Numer części AD7226KRZ
Szczegółowy opis  LC2MOS Quad 8-Bit D/A Converter
Download  16 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7226KRZ Arkusz danych(HTML) 6 Page - Analog Devices

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REV.
–6–
AD7226
INTERFACE LOGIC INFORMATION
Address lines A0 and A1 select which DAC will accept data
from the input port. Table I shows the selection table for the
four DACs with Figure 4 showing the input control logic. When
the
WR signal is LOW, the input latches of the selected DAC
are transparent and its 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 I. AD7226 Truth Table
AD7226 Control Inputs
AD7226
WR
A1
A0
Operation
HX
XNo Operation Device Not Selected
LL
L
DAC A Transparent
LL
DAC A Latched
LL
H
DAC B Transparent
LH
DAC B Latched
LH
L
DAC C Transparent
HL
DAC C Latched
LH
H
DAC D Transparent
HH
DAC D Latched
L = Low State, H = High State, X = Don’t Care
A0
A1
WR
TO LATCH A
TO LATCH B
TO LATCH C
TO LATCH D
Figure 4. Input Control Logic
t
DS
t
DH
t
AH
t
AS
VINL
VINH
VINH
VINL
VDD
VDD
VDD
DATA
ADDRESS
WR
0
0
0
t
WR
NOTES
1. ALL INPUT SIGNAL RISE AND FALL TIMES
MEASURED FROM 10% TO 90% OF VDD.
t
r = tf = 20ns OVER VDD RANGE.
2. TIMING MEASUREMENT REFERENCE LEVEL IS
3. SELECTED INPUT LATCH IS TRANSPARENT WHILE
WR IS
LOW, THUS INVALID DATA DURING THIS TIME CAN CAUSE
SPURIOUS OUTPUTS.
VINH + VINL
2
Figure 5. Write Cycle Timing Diagram
D


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