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Picoampere Input Current Quad
Bipolar Op Amp
AD704
FEATURES
High dc precision
150 µV maximum offset voltage
1.5 µV/°C maximum offset voltage drift
270 pA maximum input bias current
0.3 pA/°C typical I
B
drift
Low noise: 0.5 µV p-p
Typical noise: 0.1 Hz to 10 Hz
Low power: 600 µA maximum supply current per amplifier
Dual version:
AD706
CONNECTION DIAGRAMS
OUTPUT
1
–IN
2
OUTPUT
1
–IN
2
+IN
3
+V
S 4
+IN
5
–IN
6
OUTPUT
7
(Not to Scale)
2
3
1
4
14
13
12
16
OUTPUT
1
4
15
–IN
14
+IN
OUTPUT
–IN
+IN
–V
S
+IN
00818-001
+IN
3
+V
S 4
+IN
5
–IN
6
OUTPUT
7
2
3
AD704
TOP VIEW
13
–V
S
12
+IN
11
–IN
10
OUTPUT
00818-002
AD704
TOP VIEW
11
10
9
8
–IN
OUTPUT
NC
8
(Not to Scale)
9
NC
NC = NO CONNECT
OUT1
OUT4
20
APPLICATIONS
Industrial/process controls
Weigh scales
ECG/EKG instrumentation
Low frequency active filters
Figure 1. 14-Lead Plastic DIP (N)
–IN1
NC
Figure 2. 16-Lead SOIC (R) Package
–IN4
19
3
2
1
+IN1
4
NC
5
+V
S 6
NC
7
+IN2
8
1
4
18
+IN4
17
NC
16
–V
S
15
NC
AD704
TOP VIEW
(Not to Scale)
2
3
GENERAL DESCRIPTION
The AD704 is a quad, low power bipolar op amp that has the
low input bias current of a BiFET amplifier and offers a signifi-
cantly lower I
B
drift over temperature. It uses superbeta bipolar
input transistors to achieve picoampere input bias current levels
(similar to FET input amplifiers at room temperature), while its
I
B
typically increases only by 5× at 125°C (unlike a BiFET amp,
for which I
B
doubles every 10°C, resulting in a 1000× increase at
125°C). In addition, the AD704 achieves 150 μV offset voltage and
the low noise characteristics of a precision bipolar input op amp.
Because it has only 1/20 the input bias current of an OP07, the
AD704 does not require the commonly used balancing resistor.
Furthermore, the current noise is 1/5 that of the OP07, which
makes the AD704 usable with much higher source impedances.
At 1/6 the supply current (per amplifier) of the OP07, the
AD704 is better suited for today’s higher density circuit boards
and battery-powered applications.
The AD704 is an excellent choice for use in low frequency active
filters in 12- and 14-bit data acquisition systems, in precision
instrumentation, and as a high quality integrator. The AD704 is
internally compensated for unity gain stability. The AD704J is
rated over the commercial temperature range of 0°C to 70°C.
The AD704A is rated over the industrial temperature of −40°C
to +85°C. The AD704S is rated over the military temperature
range of −55°C to +125°C, processed to MIL-STD-883B.
TYPICAL I
B
(nA)
14
+IN3
OUT2
OUT3
100
10
TYPICAL JFET AMP
1
0.1
AD704
0.01
–55
–IN2
Figure 3. 20-Terminal LCC
(E-20-1) Package
–IN3
NC
NC = NO CONNECT
00818-003
9
10
11
12
13
25
TEMPERATURE (°C)
125
Figure 4. Input Bias Current Over Temperature
Table 1. Low I
B
@ 125°C
Model
Single
Dual
Quad
30V
N/A
AD706
AD704
16V
AD8663
AD8667
AD8669
1.3 to 5V
AD8603
AD8607
AD8609
Next Generation
N/A
AD8622
AD8624
Rev.
E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©
2001-2010
Analog Devices, Inc. All rights reserved.
00818-004
AD704
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Connection Diagrams ...................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Theory of Operation ...................................................................... 11
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
1/10—Rev. D to Rev. E
Updated Format .................................................................. Universal
Changes to Features and General Description Section,
Added Table 1, Renumbered Sequentially .................................... 1
Changes to Table 2 ............................................................................ 3
Changes to Table 3 ............................................................................ 5
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
12/09—Rev. C to Rev. D
Updated Outline Dimensions ....................................................... 10
Changes to Ordering Guide .......................................................... 10
11/01—Rev. B to Rev. C
Edits to Features ................................................................................ 1
Edits to Product Description .......................................................... 1
Edits to Absolute Maximum Ratings ............................................. 3
Deleted Metalization Photograph .................................................. 3
Edits to Ordering Guide .................................................................. 4
Rev. E | Page 2 of 16
AD704
SPECIFICATIONS
T
A
= 25°C, V
CM
= 0 V, and V
S
=±15 V dc, unless otherwise noted.
Table 2.
Parameters
INPUT OFFSET VOLTAGE
Initial Offset
Offset
vs. Temp, Average TC
vs. Supply (PSRR)
T
MIN
− T
MAX
Long-Term Stability
INPUT BIAS CURRENT
1
vs. Temp, Average TC
T
MIN
− T
MAX
INPUT OFFSET CURRENT
vs. Temp, Average TC
T
MIN
− T
MAX
MATCHING CHARACTERISTICS
Offset Voltage
T
MIN
− T
MAX
Input Bias Current
2
Conditions
Min
AD704J/A
Typ
50
100
0.2
132
126
0.3
100
0.3
Max
150
250
1.5
Unit
μV
μV
μV/°C
dB
dB
μV/month
pA
pA
pA/°C
pA
pA
pA
pA
pA/°C
pA
pA
μV
μV
pA
pA
dB
dB
dB
dB
dB
MHz
V/μs
V/μs
MΩ||pF
GΩ||pF
V
dB
dB
pA p-p
fA/√Hz
μV p-p
nV/√Hz
nV/√Hz
T
MIN
− T
MAX
V
S
= ±2 V to ±18 V
V
S
= ±2.5 V to ±18 V
V
CM
= 0 V
V
CM
= ±13.5 V
V
CM
= 0 V
V
CM
= ±13.5 V
V
CM
= 0 V
V
CM
= ±13.5 V
V
CM
= 0 V
V
CM
= ±13.5 V
100
100
270
300
300
400
80
0.6
100
100
250
300
300
400
250
400
500
600
T
MIN
− T
MAX
Common-Mode Rejection
Power Supply Rejection
Crosstalk
5
4
3
T
MIN
− T
MAX
T
MIN
− T
MAX
f = 10 Hz
R
LOAD
= 2 kΩ
94
94
94
94
150
0.8
0.15
0.1
40||2
300||2
±13.5
100
98
±14
132
128
3
50
0.5
17
15
FREQUENCY RESPONSE UNITY GAIN
Crossover Frequency
Slew Rate, Unity Gain
Slew Rate
INPUT IMPEDANCE
Differential
Common-Mode
INPUT VOLTAGE RANGE
Common-Mode Voltage
Common-Mode Rejection Ratio
INPUT CURRENT NOISE
INPUT VOLTAGE NOISE
G = −1
T
MIN
− T
MAX
V
CM
= ±13.5 V
T
MIN
− T
MAX
0.1 Hz to 10 Hz
f = 10 Hz
0.1 Hz to 10 Hz
f = 10 Hz
f = 1 kHz
22
Rev. E | Page 3 of 16
AD704
Parameters
OPEN-LOOP GAIN
Conditions
V
O
= ±12 V
R
LOAD
= 10 kΩ
T
MIN
− T
MAX
V
O
= ±10 V
R
LOAD
= 2 kΩ
T
MIN
− T
MAX
R
LOAD
= 10 kΩ
T
MIN
− T
MAX
Short circuit
Gain = 1
Min
200
150
200
150
AD704J/A
Typ
2000
1500
1000
1000
Max
Unit
V/mV
V/mV
V/mV
V/mV
V
±13
±14
±15
10,000
±15
±2.0
T
MIN
− T
MAX
Number of transistors
1.5
1.6
180
±18
2.4
2.6
mA
pF
V
V
mA
mA
OUTPUT CHARACTERISTICS
Voltage Swing
Current
CAPACITIVE LOAD
Drive Capability
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
TRANSISTOR COUNT
1
2
Bias current specifications are guaranteed maximum at either input.
Input bias current match is the maximum difference between corresponding inputs of all four amplifiers.
3
CMRR match is the difference of ΔV
OS
/ΔV
CM
between any two amplifiers, expressed in dB.
4
PSRR match is the difference between ΔV
OS
/ΔV
SUPPLY
for any two amplifiers, expressed in dB.
5
See Figure 5 for test circuit.
Rev. E | Page 4 of 16
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