AD7237A/AD7247A
TIMING CHARACTERISTICS
Parameter
t
1
t
2
t
3
t
4
t
5 4
t
6
t
7
t
8 5
0
0
80
80
10
0
0
80
3
3
1, 2
(V
DD
= +12 V to +15 V, V
SS
= 0 V or –12 V to –15 V, AGND = DGND = 0 V [AD7237A],
GND = 0 V [AD7247A])
Limit at T
MIN
, T
MAX
(A, B Versions)
Limit at T
MIN
, T
MAX
(T Version)
0
0
100
80
10
0
0
100
Units
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
Conditions/Comments
CS
to
WR
Setup Time
CS
to
WR
Hold Time
WR
Pulse Width
Data Valid to
WR
Setup Time
Data Valid to
WR
Hold Time
Address to
WR
Setup Time
Address to
WR
Hold Time
LDAC
Pulse Width
NOTES
1
Sample tested at +25°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of 5 V) and timed from a voltage level of 1.6 V.
2
See Figures 5 and 7.
3
Power Supply tolerance is
±
10% for A version and
±
5% for B and T versions.
4
If 0 ns < t
2
< 10 ns, add t
2
to t
5
. If t
2
≥
10 ns, add 10 ns to t
5
.
5
AD7237A only.
ABSOLUTE MAXIMUM RATINGS
1
(T
A
= +25°C unless otherwise noted)
ORDERING GUIDE
V
DD
to GND (AD7247A) . . . . . . . . . . . . . . . . –0.3 V to +17 V
V
DD
to AGND, DGND (AD7237A) . . . . . . . . –0.3 V to +17 V
V
DD
to V
SS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +34 V
AGND to DGND (AD7237A) . . . . . . . . . –0.3 V, V
DD
+0.3 V
V
OUTA
,
2
V
OUTB2
to AGND (GND) . . V
SS
–0.3 V to V
DD
+0.3 V
REF OUT to AGND (GND) . . . . . . . . . . . . . . . . . 0 V to V
DD
REF IN to AGND (GND) . . . . . . . . . . –0.3 V to V
DD
+0.3 V
Digital Inputs to DGND (GND) . . . . . . –0.3 V to V
DD
+0.3 V
Operating Temperature Range
Industrial (A, B Versions) . . . . . . . . . . . . . –40°C to +85°C
Extended (T Version) . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . 1000 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . . 10 mW/°C
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those listed in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
Short-circuit current is typically 80 mA. The outputs may be shorted to voltages
in this range provided the power dissipation of the package is not exceeded.
Model
1
AD7237AAN
AD7237ABN
AD7237AAR
AD7237ABR
AD7237ATQ
AD7247AAN
AD7247ABN
AD7247AAR
AD7247ABR
AD7247ATQ
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
Relative
Accuracy
(LSB)
±
1 max
±
1/2 max
±
1 max
±
1/2 max
±
1/2 max
±
1 max
±
1/2 max
±
1 max
±
1/2 max
±
1/2 max
Package
Option
2
N-24
N-24
R-24
R-24
Q-24
N-24
N-24
R-24
R-24
Q-24
NOTES
1
To order MIL-STD-883, Class B processed parts, add /883B to part number.
Contact local sales office for military data sheet and availability.
2
N = Plastic DIP; Q = Cerdip; R = Small Outline (SOIC).
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7237A/AD7247A features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
AD [ ANALOG DEVICES ]
