Datasheet

AD7237A/AD7247A
REV. 0
–3–
TIMING CHARACTERISTICS
1, 2
Limit at T
MIN
, T
MAX
Limit at T
MIN
, T
MAX
Parameter (A, B Versions) (T Version) Units Conditions/Comments
t
1
0 0 ns min CS to WR Setup Time
t
2
0 0 ns min CS to WR Hold Time
t
3
80 100 ns min WR Pulse Width
t
4
80 80 ns min Data Valid to WR Setup Time
t
5
4
10 10 ns min Data Valid to WR Hold Time
t
6
0 0 ns min Address to WR Setup Time
t
7
0 0 ns min Address to WR Hold Time
t
8
5
80 100 ns min 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)
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
OUTB
2
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.
ORDERING GUIDE
Relative
Temperature Accuracy Package
Model
1
Range (LSB) Option
2
AD7237AAN –40°C to +85°C ±1 max N-24
AD7237ABN –40°C to +85°C ±1/2 max N-24
AD7237AAR –40°C to +85°C ±1 max R-24
AD7237ABR –40°C to +85°C ±1/2 max R-24
AD7237ATQ –55°C to +125°C ±1/2 max Q-24
AD7247AAN –40°C to +85°C ±1 max N-24
AD7247ABN –40°C to +85°C ±1/2 max N-24
AD7247AAR –40°C to +85°C ±1 max R-24
AD7247ABR –40°C to +85°C ±1/2 max R-24
AD7247ATQ –55°C to +125°C ±1/2 max 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
(V
DD
= +12 V to +15 V,
3
V
SS
= 0 V or –12 V to –15 V,
3
AGND = DGND = 0 V [AD7237A],
GND = 0 V [AD7247A])