AD706 ,Dual Picoampere Input Current Bipolar Op AmpSpecifications subject to change without notice.lABSOLUTE MAXIMUM RATINGS ORDERING GUIDESupply Volt ..
AD706AN ,Dual Picoampere Input Current Bipolar Op Ampspecifications are guaranteed maximum at either input.2Input bias current match is the difference b ..
AD706AR ,Dual Picoampere Input Current Bipolar Op Ampcharacteristics of a precision bipolarinput amplifier.100Since it has only 1/20 the input bias curr ..
AD706AR-REEL ,Dual Picoampere Input Current Bipolar Op AmpCHARACTERISTICSOffset Voltage 150 75 μVT to T 250 150 μVMIN MAX2Input Bias Current 300 150 pAT to T ..
AD706ARZ , Dual Picoampere Input Current Bipolar Op Amp
AD706ARZ-REEL , Dual Picoampere Input Current Bipolar Op Amp
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ADC121C027CIMK , I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert Function
AD706
Dual Picoampere Input Current Bipolar Op Amp
CONNECTION DIAGRAM
Plastic Mini-DIP (N) and
Plastic SOIC (R) Packages
FEATURE
HIGH DC PRECISION
50 �V max Offset Voltage
0.6 �V/�C max Offset Drift
110 pA max Input Bias Current
LOW NOISE
0.5 �V p-p Voltage Noise, 0.1 Hz to 10 Hz
LOW POWER
750 �A Supply Current
Available in 8-Lead Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
Available in Tape and Reel in Accordance with
EIA-481A Standard
Quad Version: AD704
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
PRODUCT DESCRIPTIONThe AD706 is a dual, 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 superbeta
bipolar input transistors to achieve picoampere input bias cur-
rent 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 for a 1000¥
increase at 125∞C). The AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.
Since it has only 1/20 the input bias current of an OP07, the
AD706 does not require the commonly used “balancing” resis-
tor. Furthermore, the current noise is 1/5 that of the OP07,
which makes this amplifier usable with much higher source
impedances. At 1/6 the supply current (per amplifier) of the
OP07, the AD706 is better suited for today’s higher density
boards.
The AD706 is an excellent choice for use in low frequency
active filters in 12- and 14-bit data acquisition systems, in preci-
sion instrumentation and as a high quality integrator. The
AD706 is internally compensated for unity gain and is available
in five performance grades. The AD706J and AD706K are rated
over the commercial temperature range of 0∞C to +70∞C.
The AD706 is offered in two varieties of an 8-lead package:
plastic mini-DIP and surface mount (SOIC). “J” grade chips are
also available.
PRODUCT HIGHLIGHTSThe AD706 is a dual low drift op amp that offers BiFET
level input bias currents, yet has the low IB drift of a bipolar
amplifier. It may be used in circuits using dual op amps such
as the LT1024.The AD706 provides both low drift and high dc precision.The AD706 can be used in applications where a chopper
amplifier would normally be required but without the
chopper’s inherent noise.
Dual Picoampere Input
Current Bipolar Op AmpREV.D
Figure 1.Input Bias Current vs. Temperature
AD706–SPECIFICATIONSINPUT BIAS CURRENT
INPUT OFFSET CURRENT
MATCHING CHARACTERISTICS
FREQUENCY RESPONSE
INPUT IMPEDANCE
INPUT VOLTAGE NOISE
(@ TA = +25�C, VCM = 0 V and �15 V dc, unless otherwise noted)
NOTESBias current specifications are guaranteed maximum at either input.Input bias current match is the difference between corresponding inputs (IB of –IN of Amplifier #1 minus IB of –IN of Amplifier #2).
CMRR match is the difference between
PSRR match is the difference between
All min and max specifications are guaranteed.
Specifications subject to change without notice.
AD706
ABSOLUTE MAXIMUM RATINGSlSupply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18V
Internal Power Dissipation
(Total: Both Amplifiers)2 . . . . . . . . . . . . . . . . . . . . 650 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage3 . . . . . . . . . . . . . . . . . . . . +0.7 Volts
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . –65∞C to +125∞C
Operating Temperature Range
AD706J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0∞C to +70∞C
Lead Temperature (Soldering 10 secs) . . . . . . . . . . . . +300∞C
NOTESStresses 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.Specification is for device in free air:
8-Lead Plastic Package: qJA = 100∞C/Watt
8-Lead Small Outline Package: qJA = 155∞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 25mA.
ORDERING GUIDE*N = Plastic DIP; RN = SOIC Package.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
METALIZATION PHOTOGRAPHDimensions shown in inches and (mm).
Contact factory for latest dimensions.
AD706–Typical Performace Characteristics(@ +25�C, VS = �15V, unless otherwise noted)Figure 2. Typical Distribution of Input
Offset Voltage
Figure 5.Input Common-Mode
Voltage Range vs. Supply Voltage
Figure 8. Typical Distribution of
Offset Voltage Drift
Figure 3. Typical Distribution of
Input Bias Current
Figure 6. Large Signal Frequency
Response
Figure 9. Change in Input Offset
Voltage vs. Warm-Up Time
Figure 4. Typical Distribution of
Input Offset Current
Figure 7. Offset Voltage Drift vs.
Source Resistance
Figure 10. Input Bias Current vs.
Common-Mode Voltage
Figure 11. Input Noise Voltage
Spectral Density
Figure 14. Quiescent Supply Current
vs. Supply Voltage
Figure 17. Open-Loop Gain vs. Load
Resistance vs. Load Resistance
Figure 12. Input Noise Current
Spectral Density
Figure 15. Common-Mode Rejection
Ratio vs. Frequency
Figure 18. Open-Loop Gain and
Phase Shift vs. Frequency
Figure 13. 0.1 Hz to 10 Hz Noise
Voltage
Figure 16. Power Supply Rejection
Ratio vs. Frequency
Figure 19. Output Voltage Swing vs.
Supply Voltage
AD706Figure 20a. Crosstalk vs. Frequency
Figure 20b. Crosstalk Test Circuit
Figure 21. Magnitude of Closed-Loop Output Impedance
vs. Frequency
Figure 22a. Unity Gain Follower (For Large Signal
Applications, Resistor RF Limits the Current
Through the Input Protection Diodes)
Figure 22b. Unity Gain Follower
Figure 22c. Unity Gain Follower
Figure 22d. Unity Gain Follower
