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AD704KN ,Quad Picoampere Input Current Bipolar Op AmpCHARACTERISTICSOffset Voltage 250 130 150 μVT –T 400 200 250 μVMIN MAX2Input Bias Current 500 300 4 ..
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AD704AR-AD704JN-AD704JR-AD704KN-AD704TQ
Quad Picoampere Input Current Bipolar Op Amp
REV.A
FEATURES
High DC Precision
75 mV max Offset Voltage
1 mV/8C max Offset Voltage Drift
150 pA max Input Bias Current
0.2 pA/8C typical IB Drift
Low Noise
0.5mV p-p typical Noise, 0.1 Hz to 10 Hz
Low Power
600 mA max Supply Current per Amplifier
Chips & MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Single Version:AD705, Dual Version:AD706
PRIMARY APPLICATIONS
Industrial/Process Controls
Weigh Scales
ECG/EKG Instrumentation
Low Frequency Active Filters
PRODUCT DESCRIPTIONThe AD704 is a quad, low power bipolar op amp that has the
low input bias current of a BiFET amplifier but which offers a
significantly lower IB drift over temperature. It utilizes Super-
beta bipolar input transistors to achieve picoampere input bias
current levels (similar to FET input amplifiers at room tempera-
ture), while its IB typically only increases by 5× at +125°C
(unlike a BiFET amp, for which IB doubles every 10°C resulting
in a 1000× increase at +125°C). Furthermore the AD704
achieves 75μV offset voltage and low noise characteristics of a
precision bipolar input op amp.
–55+25+125
TEMPERATURE – °C
TYPICAL I – nAFigure 1.Input Bias Current Over Temperature
CONNECTION DIAGRAMS
Quad Picoampere Input Current
Bipolar Op Amp
14-Pin Plastic DIP (N)
14-Pin Cerdip (Q) Packages
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT++++
+VS–VS
16-Pin SOIC
(R) Package
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT
+VS–VS
NC = NO CONNECTNC++++
20-Terminal LCC(E) PackageSince it has only 1/20 the input bias current of an AD OP07, the
AD704 does not require the commonly used “balancing”
resistor. Furthermore, the current noise is 1/5 that of the
AD OP07 which makes the AD704 usable with much higher
source impedances. At 1/6 the supply current (per amplifier) of
the AD 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 and is available
in five performance grades. The AD704J and AD704K are rated
over the commercial temperature range of 0°C to +70°C. The
AD704A and AD704B are rated over the industrial temperature
of –40°C to +85°C. The AD704T is rated over the military
temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B, Rev. C.
AD704–SPECIFICATIONS(@ TA = +258C, VCM = 0 V, and 615 V dc, unless otherwise noted)
METALIZATION PHOTOGRAPHDimensions shown in inches and (mm).
Contact factory for latest dimensions.
AD704NOTESBias current specifications are guaranteed maximum at either input.Input bias current match is the maximum difference between corresponding inputs of all four amplifiers.CMRR match is the difference of ΔVOS/ΔVCM between any two amplifiers, expressed in dB.PSRR match is the difference between ΔVOS/ΔVSUPPLY for any two amplifiers, expressed in dB.See Figure 2a for test circuit.
All min and max specifications are guaranteed.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation (+25°C) . . . . . . . . . . . See Note 2
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage3 . . . . . . . . . . . . . . . . . . . . . . . ±0.7 V
Output Short Circuit Duration (Single Input) . . . . . Indefinite
Storage Temperature Range
(Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
(N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD704J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD704A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD704T . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 10 seconds) . . . . +300°C
NOTESStresses 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 section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.Specification is for device in free air:
14-Pin Plastic Package:θJA = 150°C/Watt
14-Pin Cerdip Package:θJA = 110°C/Watt
16-Pin SOIC Package:θJA = 100°C/Watt
20-Terminal LCC Package:θJA = 150°C/WattThe input pins of this amplifier are protected by back-to-back diodes. If the
differential voltage exceeds ±0.7 volts, external series protection resistors should
be added to limit the input current to less than 25 mA.
+VS
–VS
ALL 4 AMPLIFIERS ARE CONNECTED AS SHOWN
AD704
PIN 4
AD704
PIN 11
COM
0.1 µF
0.1 µF
INPUT
SIGNAL*
9kΩ
1kΩ
1kΩ
2.5kΩ
AD704–Typical Characteristics
(@ +258C, VS = 615 V, unless otherwise noted)
ORDERING GUIDEChips are also available.
*E = Leadless Ceramic Chip Carrier; N = Plastic DIP; Q = Cerdip;
R = Small Outline (SOIC).
Figure 3.Typical Distribution of
Input Offset Voltage
Figure 6.Input Common-Mode
Voltage Range vs. Supply Voltage
Figure 4.Typical Distribution of
Input Bias Current
1M
OUTPUT VOLTAGE – Volts p-p
FREQUENCY – Hz10k100kFigure 7.Large Signal Frequency
Response
Figure 5.Typical Distribution of
Input Offset Current
AD704Figure 18.Open-Loop Gain vs.
Load Resistance Over Temperature
Figure 21.Closed-Loop Output
Impedance vs. Frequency
Figure 22c.Unity Gain Follower
Small Signal Pulse Response
RF = 0Ω, CL = 100 pF
Figure 19.
vs. Frequency
