AD694
Model
BUFFER AMPLIFIER
6
Input Offset Voltage
Initial Offset
T
MIN
to T
MAX
vs. Supply
vs. Common Mode
Trim Range
Frequency Response
Unity Gain, Small Signal
Input Voluge Noise (0.1 Hz to 10 Hz)
Open-Loop Gain
V
O
= +10 V, R
L
≥
10 kΩ
Output Voltage @ Pin 1, FB
1
Minimum Output Voltage
Maximum Output Voltage
AD694JN/AQ/AR
Min
Typ
Max
Min
AD694BQ/BR
Typ
Max
Units
80
80
2.5
±
150
±
2
90
90
±
4.0
300
2
50
1.0
V
S
–2 V
500
±
3
80
80
2.5
±
50
±
2
90
90
±
4.0
300
2
50
500
±
3
µV
µV/°C
dB
dB
mV
kHz
µV
p-p
V/mV
10
V
S
–2.5 V
V
S
–2.5 V
1.0
V
S
–2 V
10
mV
V
NOTES
1
The single supply op amps of the AD694, lacking pull down current, may not reach 0.000 V at their outputs. For this reason, span, offset, and nonlinearity are
specified with the input amplifiers operating in their linear range. The input voltage used for the tests is 5 mV to 2 V and 5 mV to 10 V for the two precalibrated
input ranges. Span and zero accuracy are tested with the buffer amplifier configured as a follower.
2
Offset at 4 mA out and 0 mA out are extrapolated to 0.000 V input from measurements made at 5 mV and at full scale. See Note 1.
3
Nonlinearity is specified as the maximum deviation of the output, as a % of span, from a straight line drawn through the endpoints of the transfer function.
4
Voltage reference drift guaranteed by the Box Method. The voltage reference output over temperature will fall inside of a box whose length is determined by the
temperature range and whose height is determined by the maximum temperature coefficient multiplied by the temperature span in degrees C.
5
Devices tested at these temperatures with a pass transistor. Allowable temperature range of operation is dependent upon internal power dissipation. Absolute
maximum junction and case temperature should not be exceeded. See section: “Power Dissipation Considerations.”
6
Buffer amplifier specs for reference. Buffer amplifier offset and drift already included in Span and Zero accuracy specs above.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
V
S
to I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
Input Voltage, (Either Input Pin 2 or 3) . . . . . –0.3 V to +36 V
Reference Short Circuit to Common . . . . . . . . . . . . Indefinite
Alarm Voltage, Pin 10 . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
4 mA Adj, Pin 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1 V
4 mA On/Off, Pin 9 . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 36 V
Storage Temperature Range
AD694Q . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
AD694N, R . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
Lead Temperature, 10 sec Soldering . . . . . . . . . . . . . . +300°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . +150°C
Maximum Case Temperature
Plastic Package (N, R) . . . . . . . . . . . . . . . . . . . . . . . +125°C
Cerdip Package (Q) . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
Transistor Count: . . . . . . . . . . . . . . . . . . . . .75 Active Devices
Substrate Connection: . . . . . . . . . . . . . . . . . . . . to Com, Pin 5
Thermal Characteristics:
Plastic (N) Package:
θ
JC
= 50°C/Watt
θ
CA
(Still Air) = 85°C/Watt
Cerdip (Q) Package:
θ
JC
= 30°C/Watt
θ
CA
(Still Air) = 70°C/Watt
Plastic (R) Package:
θ
JC
= 27°C/Watt
θ
CA
(Still Air) = 73°C/Watt
ESD Susceptibility
All pins are rated for a minimum of 4000 V protection, except
for Pins 2, 3 and 9 which are rated to survive a minimum of
1500 V. ESD testing conforms to Human Body Model. Always
practice ESD prevention.
No pin, other than I
OUT
(11) and
±
Sig (2), (3) as noted, may be permitted to become more negative than Com (5). No pin may be
permitted to become more positive than V
S
(13).
PIN CONFIGURATION (N, R, Q PACKAGE)
ORDERING GUIDE
Model
AD694JN
AD694AQ
AD694AR
AD694BQ
AD694BR
Temperature
Range
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
Option*
N-16
Q-16
R-16
Q-16
R-16
*N = Plastic DIP; Q = Cerdip, R = SOIC.
REV. A
–3–
AD [ ANALOG DEVICES ]
