AD704 Analog Devices, AD704 Datasheet

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AD704

Manufacturer Part Number
AD704
Description
Picoampere Input Current Quad Bipolar Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD704

Vcc-vee
4V to 36V
Isy Per Amplifier
600µA
Packages
DIP,LCC,SOIC
-3db Bandwidth
800kHz
Slew Rate
150mV/µs
Vos
30µV
Ib
100pA
# Opamps Per Pkg
4
Input Noise (nv/rthz)
15nV/rtHz

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FEATURES
High dc precision
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:
APPLICATIONS
Industrial/process controls
Weigh scales
ECG/EKG instrumentation
Low frequency active filters
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
input transistors to achieve picoampere input bias current levels
(similar to FET input amplifiers at room temperature), while its
I
for which I
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.
Rev.
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.
B
typically increases only by 5× at 125°C (unlike a BiFET amp,
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
E
B
doubles every 10°C, resulting in a 1000× increase at
B
AD706
drift over temperature. It uses superbeta bipolar
B
drift
Picoampere Input Current Quad
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1. Low I
Model
Single
Dual
Quad
OUTPUT
OUTPUT
Figure 1. 14-Lead Plastic DIP (N)
+V
–IN
+IN
+IN
–IN
S
1
2
3
4
5
6
7
0.01
100
0.1
10
(Not to Scale)
1
30V
N/A
AD706
AD704
–55
TOP VIEW
AD704
+IN1
+IN2
+V
1
2
NC
NC
Figure 4. Input Bias Current Over Temperature
S
B
4
5
6
7
8
CONNECTION DIAGRAMS
4
3
@ 125°C
©
2001-2010
14
13
12
11
10
9
8
16V
AD8663
AD8667
AD8669
3
9
Figure 3. 20-Terminal LCC
1
2
OUTPUT
–IN
+IN
–V
+IN
–IN
OUTPUT
(Not to Scale)
10
TOP VIEW
2
S
AD704
(E-20-1) Package
TEMPERATURE (°C)
11
1
Analog Devices, Inc. All rights reserved.
20
12
25
Bipolar Op Amp
TYPICAL JFET AMP
OUTPUT
OUTPUT
4
3
1.3 to 5V
AD8603
AD8607
AD8609
19
13
Figure 2. 16-Lead SOIC (R) Package
NC = NO CONNECT
+V
–IN
+IN
+IN
–IN
NC
AD704
S
18
17
16
15
14
1
2
3
4
5
6
7
8
NC = NO CONNECT
+IN4
NC
–V
NC
+IN3
(Not to Scale)
S
TOP VIEW
AD704
1
2
Next Generation
N/A
AD8622
AD8624
www.analog.com
AD704
4
3
125
16
15
14
13
12
11
10
9
OUTPUT
–IN
+IN
–V
+IN
–IN
OUTPUT
NC
S

Related parts for AD704

AD704 Summary of contents

Page 1

... Industrial/process controls Weigh scales ECG/EKG instrumentation Low frequency active filters 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 drift over temperature. It uses superbeta bipolar B ...

Page 2

... AD704 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Connection Diagrams ...................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 REVISION HISTORY 1/10—Rev 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— ...

Page 3

... T MIN MAX ±13 ±13.5 V 100 CM T − MIN MAX 0 0 kHz Rev Page AD704 AD704J/A Typ Max Unit 50 150 μV 100 250 μV 0.2 1.5 μV/°C 132 dB 126 dB 0.3 μV/month 100 270 ...

Page 4

... MIN MAX kΩ LOAD T − T MIN MAX Short circuit Gain = 1 T − T MIN MAX Number of transistors for any two amplifiers, expressed in dB. SUPPLY Rev Page AD704J/A Min Typ Max Unit 200 2000 V/mV 150 1500 V/mV 200 1000 V/mV 150 1000 V/mV V ±13 ± ...

Page 5

... ESD CAUTION AD704 PIN 4 0.1µF 1µF 0.1µF 1µF AD704 PIN 11 Rev Page 100 1k 10k FREQUENCY (Hz) Figure 6. Crosstalk vs. Frequency AD704 AMP4 AMP2 AMP3 100k ...

Page 6

... AD704 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° ±15 V dc, unless otherwise noted –80 –40 0 INPUT OFFSET VOLTAGE (µV) Figure 7. Typical Distribution of Input Offset Voltage –160 –80 0 INPUT BIAS CURRENT (pA) Figure 8. Typical Distribution of Input Bias Current ...

Page 7

... Rev Page 100 FREQUENCY (Hz) Figure 16. Input Noise Voltage Spectral Density 100Ω 10kΩ 20MΩ V OUT 10 100 FREQUENCY (Hz) Figure 17. Input Noise Current Spectral Density 5 TIME (Seconds) Figure 18. 0 Noise Voltage AD704 ...

Page 8

... AD704 500 450 400 +125°C +25°C 350 –55°C 200 SUPPLY VOLTAGE (±V) Figure 19. Quiescent Supply Current vs. Supply Voltage (per Amplifier) 160 V = ±15V S 140 120 100 0 100 1k FREQUENCY (Hz) Figure 20. Common-Mode Rejection vs. Frequency 180 V = ±15V 25°C ...

Page 9

... S 0.1µF 10kΩ 1/4 AD704 R L SQUARE C L 2.5kΩ WAVE INPUT 0.1µF –V S Figure 30. Unity Gain Inverter Connection AD704 • • • • • • • • Ω, F • • • • • • • • Ω OUT ...

Page 10

... AD704 2V 100 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ...

Page 11

... CAPACITORS C2 AND C4 ARE SOUTHERN ELECTRONICS MPCC, POLYCARBONATE, ±5%, 50V. 3. ALL RESISTORS METAL FILM, 1%. The instrumentation amplifier with post filtering (see Figure 34) combines two applications that benefit greatly from the AD704. This circuit achieves low power and dc precision over temperature with a minimum of components. ...

Page 12

... The low current noise and I allow the use of 1 MΩ resistors without sacrificing OS B the 1 μV/°C drift of the AD704. This means that lower capacitor values can be used, reducing cost and space. Furthermore, because the AD704’ low as its temperature range, most applications do not require the use of the normal balancing resistor (with its stability capacitor) ...

Page 13

... PLANE 0.31 (0.0122) 0.20 (0.0079) COMPLIANT TO JEDEC STANDARDS MS-013- AA Figure 38. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters and (inches) Rev Page 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX 45° 8° 0° 1.27 (0.0500) 0.40 (0.0157) AD704 ...

Page 14

... AD704ARZ-16-REEL −40°C to +85°C AD704JN 0°C to 70°C AD704JNZ 0°C to 70°C AD704JR-16 0°C to 70°C AD704JR-16-REEL 0°C to 70°C AD704JRZ-16 0°C to 70°C AD704JRZ-16-REEL 0°C to 70°C AD704SE/883B −55°C to +125° RoHS Compliant Part ...

Page 15

... NOTES Rev Page AD704 ...

Page 16

... AD704 NOTES ©2001-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00818-0-1/10(E) Rev Page ...

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