AD7837/AD7847
REV. C
–3–
TIMING CHARACTERISTICS
1, 2, 3
Limit at T
MIN
, T
MAX
Parameter (All Versions) Unit Conditions/Comments
t
1
0 ns min CS to WR Setup Time
t
2
0 ns min CS to WR Hold Time
t
3
30 ns min WR Pulsewidth
t
4
80 ns min Data Valid to WR Setup Time
t
5
0 ns min Data Valid to WR Hold Time
t
6
4
0 ns min Address to WR Setup Time
t
7
4
0 ns min Address to WR Hold Time
t
8
4
50 ns min LDAC Pulsewidth
NOTES
1
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 3 and 5.
3
Guaranteed by design and characterization, not production tested.
4
AD7837 only.
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
V
DD
to DGND, AGNDA, AGNDB . . . . . . . –0.3 V to +17 V
V
SS
1
to DGND, AGNDA, AGNDB . . . . . . . +0.3 V to –17 V
V
REFA
, V
REFB
to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . V
SS
– 0.3 V to V
DD
+ 0.3 V
AGNDA, AGNDB to DGND . . . . . . . –0.3 V to V
DD
+ 0.3 V
V
OUTA
2
, V
OUTB
2
to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . V
SS
– 0.3 V to V
DD
+ 0.3 V
R
FBA
3
, R
FBB
3
to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . V
SS
– 0.3 V to V
DD
+ 0.3 V
Digital Inputs to DGND . . . . . . . . . . . –0.3 V to V
DD
+ 0.3 V
Operating Temperature Range
Commercial/Industrial (A, B Versions) . . . –40°C to +85°C
Extended (S 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
If V
SS
is open circuited with V
DD
and either AGND applied, the V
SS
pin will float
positive, exceeding the Absolute Maximum Ratings. If this possibility exists, a
Schottky diode connected between V
SS
and AGND (cathode to AGND) ensures
the Maximum Ratings will be observed.
2
The outputs may be shorted to voltages in this range provided the power dissipation
of the package is not exceeded.
3
AD7837 only.
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; 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 condi-
tions for extended periods may affect device reliability. Only one Absolute
Maximum Rating may be applied at any one time.
ORDERING GUIDE
Temperature Relative Package
Model
1
Range Accuracy Option
2
AD7837AN –40°C to +85°C ±1 LSB N-24
AD7837BN –40°C to +85°C ±1/2 LSB N-24
AD7837AR –40°C to +85°C ±1 LSB R-24
AD7837BR –40°C to +85°C ±1/2 LSB R-24
AD7837AQ –40°C to +85°C ±1 LSB Q-24
AD7837BQ –40°C to +85°C ±1/2 LSB Q-24
AD7837SQ –55°C to +125°C ±1 LSB Q-24
AD7847AN –40°C to +85°C ±1 LSB N-24
AD7847BN –40°C to +85°C ±1/2 LSB N-24
AD7847AR –40°C to +85°C ±1 LSB R-24
AD7847BR –40°C to +85°C ±1/2 LSB R-24
AD7847AQ –40°C to +85°C ±1 LSB Q-24
AD7847BQ –40°C to +85°C ±1/2 LSB Q-24
AD7847SQ –55°C to +125°C ±1 LSB Q-24
NOTES
1
To order MIL-STD-883, Class B processed parts, add /883B to part number.
2
N = Plastic DIP; Q = Cerdip; R = 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 these devices feature 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.
(V
DD
= +15 V 5%, V
SS
= –15 V 5%, AGNDA = AGNDB = DGND = O V)
