AD704AR-16 ,Quad Picoampere Input Current Bipolar Op AmpCHARACTERISTICSOffset Voltage 250 130 150 µ VT –T 400 200 250 µ VMIN MAX2Input Bias Current 500 300 ..
AD704AR-16 ,Quad Picoampere Input Current Bipolar Op Ampapplications.The AD704 is an excellent choice for use in low frequency active 1filters in 12- and 1 ..
AD704ARZ-16 , Picoampere Input Current Quad Bipolar Op Amp
AD704JN ,Quad Picoampere Input Current Bipolar Op Ampspecifications are guaranteed maximum at either input.2Input bias current match is the maximum diff ..
AD704JNZ , Picoampere Input Current Quad Bipolar Op Amp
AD704JR ,Quad Picoampere Input Current Bipolar Op AmpSPECIFICATIONS(@ T = +258C, V = 0 V, and 615 V dc, unless otherwise noted)A CMModel AD704J/A AD704K ..
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AD704AR-16
Quad Picoampere Input Current Bipolar Op Amp
REV.C
Quad Picoampere Input Current
Bipolar Op Amp
FEATURES
High DC Precision
75 �V Max Offset Voltage
1 �V/�C Max Offset Voltage Drift
150 pA Max Input Bias Current
0.2 pA/�C Typical IB Drift
Low Noise
0.5�V p-p Typical Noise, 0.1 Hz to 10 Hz
Low Power
600 �A Max Supply Current per Amplifier
MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Dual Version:AD706
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 temperature),
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 achievesµV offset voltage and low noise characteristics of a precision
bipolar input op amp.
Since 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
is 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.
CONNECTION DIAGRAMS
14-Lead Plastic DIP (N)
14-Lead CerDIP (Q) Packages
16-Lead SOIC
(R) Package
20-Terminal LCC
(E) Package
AMP 1
AMP 4
AMP 312019
+IN4
–VS
+IN3
IN1
OUT1OUT4
IN4
+IN1
+VS
+IN2
IN2
OUT2
OUT3
IN3NC = NO CONNECT
AD704Figure 1.Input Bias Current Over Temperature
AD704–SPECIFICATIONS(@ TA = 25�C, VCM = 0 V, and �15 V dc, unless otherwise noted.)
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 ∆VOS/∆VCM between any two amplifiers, expressed in dB.PSRR match is the difference between ∆VOS/∆VSUPPLY 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.
AD704
ORDERING GUIDEAD704AN*
AD704AR
AD704AR-REEL
AD704SE/883B
Chips are also available.
*Not for new designs; obsolete April 2002.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
N, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD704J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
AD704A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD704T . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 10 seconds) . . . . . 300°C
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; 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.
2Specification is for device in free air:
14-Lead Plastic Package:θJA = 150°C/W
14-Lead Cerdip Package:θJA = 110°C/W
16-Lead SOIC Package:θJA = 100°C/W
20-Terminal LCC Package:θJA = 150°C/W
3The 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.
Figure 2a.Crosstalk Test Circuit
Figure 2b.Crosstalk vs. Frequency
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD704 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
(@ 25�C, VS = �15 V dc, unless otherwise noted.)TPC 1.Typical Distribution of
Input Offset Voltage
TPC 4.Input Common-Mode
Voltage Range vs. Supply Voltage
TPC 7.Typical Distribution of
Offset Voltage Drift
TPC 2.Typical Distribution of
Input Bias Current
TPC 5.Large Signal Frequency
Response
TPC 8.Change in Input Offset
Voltage vs. Warm-Up Time
TPC 3.Typical Distribution of
Input Offset Current
TPC 6.Offset Voltage Drift vs.
Source Resistance
TPC 9.Input Bias Current vs.
Common-Mode Voltage
AD704TPC 12. 0.1 Hz to 10 Hz Noise Voltage
TPC 15.Power Supply Rejection
vs. Frequency
TPC 18.Output Voltage Swing vs.
Supply Voltage
TPC 11.Input Noise Current
Spectral Density
TPC 14.Common-Mode
Rejection vs. Frequency
TPC 17.Open-Loop Gain and Phase
vs. Frequency
TPC 10.Input Noise Voltage
Spectral Density
TPC 13.Quiescent Supply Current
vs. Supply Voltage (per Amplifier)
TPC 16.Open-Loop Gain vs. Load
Resistance Over Temperature
