Datasheet

AD779
–5–
REV. B
ESD SENSITIVITY
The AD779 features input protection circuitry consisting of large “distributed” diodes and
polysilicon series resistors to dissipate both high energy discharges (Human Body Model) and fast,
low energy pulses (Charged Device Model). Per Method 3015.2 of MIL-STD-883C, the AD779
has been classified as a Category 1 device.
Proper ESD precautions are strongly recommended to avoid functional damage or performance
degradation. Charges as high as 4000 volts readily accumulate on the human body and test
equipment and discharge without detection. Unused devices must be stored in conductive foam or
shunts, and the foam should be discharged to the destination socket before devices are removed. For
further information on ESD precautions, refer to Analog Devices’ ESD Prevention Manual.
ABSOLUTE MAXIMUM RATINGS
1
With
Respect
Specification To Min Max Units
V
CC
AGND –0.3 +18 V
V
BE
AGND –18 +0.3 V
V
CC
2
V
EE
–0.3 +26.4 V
V
DD
DGND 0 +7 V
AGND DGND –1 +1 V
AIN, REF
IN
AGND V
EE
V
CC
V
Digital Inputs DGND –0.5 +7 V
Digital Outputs DGND –0.5 V
DD
+0.3 V
Max Junction
Temperature 175 °C
Operating Temperature
J and K Grades 0 +70 °C
A and B Grades –40 +85 °C
S and T Grades –55 +125 °C
Storage Temperature –65 +150 °C
Lead Temperature
(10 sec max) +300 °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 indicated in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
The AD779 is not designed to operate from ±15 V supplies.
WARNING!
ESD SENSITIVE DEVICE
ORDERING GUIDE
1
Model
2
Temperature Range Tested and Specified Package Description Package Option
3
AD779JN 0°C to +70°C AC 28-Pin Plastic DIP N-28
AD779KN 0°C to +70°C AC + DC 28-Pin Plastic DIP N-28
AD779JD 0°C to +70°C AC 28-Pin Ceramic DIP D-28
AD779KD 0°C to +70°C AC + DC 28-Pin Ceramic DIP D-28
AD779AD –40°C to +85°C AC 28-Pin Ceramic DIP D-28
AD779BD –40°C to +85°C AC + DC 28-Pin Ceramic DIP D-28
AD779SD –55°C to +125°C AC 28-Pin Ceramic DIP D-28
AD779TD –55°C to +125°C AC + DC 28-Pin Ceramic DIP D-28
NOTES
1
For two cycle read (8+16 bits) interface to 8-bit buses, see AD679.
2
For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current
AD779/883B data sheet.
3
D = Ceramic DIP; N = Plastic DIP.