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AD7228ABQ Arkusz danych(PDF) 3 Page - Analog Devices

Numer części AD7228ABQ
Szczegółowy opis  LC2MOS Octal 8-Bit DAC Mount Packages
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Strona internetowa  http://www.analog.com
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AD7228ABQ Arkusz danych(HTML) 3 Page - Analog Devices

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SWITCHING CHARACTERISTICS
1, 2
Limit at 25
°C
Limit at TMIN, TMAX
Limit at TMIN, TMAX
Parameters
All Grades
(B, C Versions)
(T, U Versions)
Units
Conditions/Comments
t1
0
0
0
ns min
Address to WR Setup Time
t2
0
0
0
ns min
Address to WR Hold Time
t3
70
90
100
ns min
Data Valid to WR Setup Time
t4
10
10
10
ns min
Data Valid to WR Hold Time
t5
95
120
150
ns min
Write Pulse Width
NOTES
1Sample tested at 25
°C to ensure compliance. All input rise and fall times measured from 10% to 90% of +5 V, t
R = tF = 5 ns.
2Timing measurement reference level is
V
INH + V INL
2
INTERFACE LOGIC INFORMATION
Address lines A0, A1 and A2 select which DAC accepts data
from the input port. Table I shows the selection table for the
eight DACs with Figure 1 showing the input control logic.
When the WR signal is low, the input latch of the selected DAC
is 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. AD7228A Truth Table
AD7228A Control Inputs
AD7228A
WR
A2
A1
A0
Operation
H
X
X
X
No Operation
Device Not Selected
LLLL
DAC 1 Transparent
g
L
L
L
DAC 1 Latched
LLLH
DAC 2 Transparent
L
L
H
L
DAC 3 Transparent
L
L
H
H
DAC 4 Transparent
L
H
L
L
DAC 5 Transparent
L
H
L
H
DAC 6 Transparent
L
H
H
L
DAC 7 Transparent
L
H
H
H
DAC 8 Transparent
H = High State
L = Low State
X = Don’t Care
+5 V SUPPLY OPERATION
BC
T
U
Parameter
Version
Version
Version
Version
Units
Conditions/Comments
STATIC PERFORMANCE
Resolution
8888
Bits
Relative Accuracy
± 2
± 2
± 2
± 2
LSB max
Differential Nonlinearity
± 1
± 1
± 1
± 1
LSB max
Guaranteed Monotonic
Full-Scale Error
± 4
± 2
± 4
± 2
LSB max
Zero Code Error
@ 25
°C
± 30
± 20
± 30
± 20
mV max
TMIN to TMAX
± 40
± 30
± 40
± 30
mV max
REFERENCE INPUT
Reference Input Range
1.2
1.2
1.2
1.2
V min
1.3
1.3
1.3
1.3
V max
Reference Input Resistance
2222k
Ω min
Reference Input Capacitance
500
500
500
500
pF max
POWER REQUIREMENTS
Positive Supply Range
4.75/5.25
4.75/5.25
4.75/5.25
4.75/5.25
V min/V max
For Specified Performance
Positive Supply Current
@ 25
°C
16161616
µA max
TMIN to TMAX
20
20
22
22
µA max
Negative Supply Current
@ 25
°C
14141414
µA max
TMIN to TMAX
18
18
20
20
µA max
NOTES
All of the specifications as per Dual Supply Specifications except for negative full-scale settling-time when VSS = 0 V.
Specifications subject to change without notice.
(VDD = +5 V
5%, VSS; = 0 to –5 V
10%, GND = 0 V, VREF = +1.25 V, RL = 2 k , CL = 100 pF
unless otherwise noted.) AII specifications TMIN to TMAX unless otherwise noted.
(See Figures 1, 2; VDD = +5 V
5% or +10.8 V to +16.5 V; VSS = 0 V or –5 V
10%)
Figure 1. Input Control Logic
Figure 2. Write Cycle Timing Diagram
AD7228A
REV. A
–3–


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