AD7837/AD7847
TIMING CHARACTERISTICS1, 2, 3 (VDD = +15 V ꢀ 5%, VSS = –15 V ꢀ 5%, AGNDA = AGNDB = DGND = O V)
Limit at TMIN, TMAX
(All Versions)
Parameter
Unit
Conditions/Comments
t1
t2
t3
t4
t54
t64
t74
t8
0
0
30
80
0
0
0
50
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
CS to WR Setup Time
CS to WR Hold Time
WR Pulsewidth
Data Valid to WR Setup Time
Data Valid to WR Hold Time
Address to WR Setup Time
Address to WR Hold Time
LDAC Pulsewidth
NOTES
1All 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.
2See Figures 3 and 5.
3Guaranteed by design and characterization, not production tested.
4AD7837 only.
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
ORDERING GUIDE
Temperature Relative
Package
Option2
VDD to DGND, AGNDA, AGNDB . . . . . . . –0.3 V to +17 V
VSS1 to DGND, AGNDA, AGNDB . . . . . . . +0.3 V to –17 V
Model1
Range
Accuracy
V
REFA, VREFB to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . VSS – 0.3 V to VDD + 0.3 V
AD7837AN
AD7837BN
AD7837AR
AD7837BR
AD7837AQ
AD7837BQ
AD7837SQ
–40°C to +85°C
–40°C to +85°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
1 LSB
1/2 LSB
1 LSB
1/2 LSB
1 LSB
1/2 LSB
1 LSB
N-24
N-24
R-24
R-24
Q-24
Q-24
Q-24
AGNDA, AGNDB to DGND . . . . . . . –0.3 V to VDD + 0.3 V
VOUTA2, VOUTB2 to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . VSS – 0.3 V to VDD + 0.3 V
RFBA3, RFBB3 to AGNDA, AGNDB
. . . . . . . . . . . . . . . . . . . . . . . . . . VSS – 0.3 V to VDD + 0.3 V
Digital Inputs to DGND . . . . . . . . . . . –0.3 V to VDD + 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
AD7847AN
AD7847BN
AD7847AR
AD7847BR
AD7847AQ
AD7847BQ
AD7847SQ
–40°C to +85°C
–40°C to +85°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
1 LSB
1/2 LSB
1 LSB
1/2 LSB
1 LSB
1/2 LSB
1 LSB
N-24
N-24
R-24
R-24
Q-24
Q-24
Q-24
NOTES
NOTES
1To order MIL-STD-883, Class B processed parts, add /883B to part number.
2N = Plastic DIP; Q = Cerdip; R = SOIC.
1If VSS is open circuited with VDD and either AGND applied, the VSS pin will float
positive, exceeding the Absolute Maximum Ratings. If this possibility exists, a
Schottky diode connected between VSS and AGND (cathode to AGND) ensures
the Maximum Ratings will be observed.
2The outputs may be shorted to voltages in this range provided the power dissipation
of the package is not exceeded.
3AD7837 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.
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.
WARNING!
ESD SENSITIVE DEVICE
REV. C
–3–
ADI [ ADI ]
