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AD743JNZ
Ultralow Noise BiFET Op Amp
REV.E
Ultralow Noise
BiFET Op Amp
FEATURES
Ultralow Noise Performance
2.9 nV/√Hz at 10 kHz
0.38 �V p-p, 0.1 Hz to 10 Hz
6.9 fA/√Hz Current Noise at 1 kHz
Excellent DC Performance
0.5 mV Max Offset Voltage
250 pA Max Input Bias Current
1000 V/mV Min Open-Loop Gain
AC Performance
2.8 V/�s Slew Rate
4.5 MHz Unity-Gain Bandwidth
THD = 0.0003% @ 1 kHz
Available in Tape and Reel in Accordance with
EIA-481A Standard
APPLICATIONS
Sonar Preamplifiers
High Dynamic Range Filters (>140 dB)
Photodiode and IR Detector Amplifiers
Accelerometers
CONNECTION DIAGRAMS
8-Lead PDIP (N)16-Lead SOIC (R)
GENERAL DESCRIPTIONThe AD743 is an ultralow noise, precision, FET input, monolithic
operational amplifier. It offers a combination of the ultralow volt-
age noise generally associated with bipolar input op amps and
the very low input current of a FET input device. Furthermore,
the AD743 does not exhibit an output phase reversal when the
negative common-mode voltage limit is exceeded.
The AD743’s guaranteed, maximum input voltage noise of
4.0nV/√Hz at 10 kHz is unsurpassed for a FET input mono-
lithic op amp, as is the maximum 1.0 µV p-p, 0.1 Hz to 10Hz
noise. The AD743 also has excellent dc performance with 250pA
maximum input bias current and 0.5 mV maximum offset voltage.
The AD743 is specifically designed for use as a preamp in capaci-
tive sensors, such as ceramic hydrophones. The AD743J is rated
over the commercial temperature range of 0°C to 70°C.
The AD743 is available in a 16-lead SOIC and 8-lead PDIP.
PRODUCT HIGHLIGHTSThe low offset voltage and low input offset voltage drift of the
AD743 coupled with its ultralow noise performance mean
that the AD743 can be used for upgrading many applications
now using bipolar amplifiers.The combination of low voltage and low current noise make
the AD743 ideal for charge sensitive applications such as
accelerometers and hydrophones.The low input offset voltage and low noise level of the AD743
provide >140 dB dynamic range.The typical 10 kHz noise level of 2.9 nV/√Hz permits a three
op amp instrumentation amplifier, using three AD743s, to be
built which exhibits less than 4.2 nV/√Hz noise at 10kHz
and which has low input bias currents.
Figure 1.Input Voltage Noise vs. Source Resistance
AD743–SPECIFICATIONS(@ 25�C and �15 V dc, unless otherwise noted.)INPUT IMPEDANCE
INPUT VOLTAGE RANGE
OPEN-LOOP GAIN
NOTESInput offset voltage specifications are guaranteed after five minutes of operation at TA = 25°C.Test conditions: +VS = 15 V, –VS = 12 V to 18 V; and +VS = 12 V to 18 V, –VS = 15 V.Bias current specifications are guaranteed maximum at either input after 5 minutes of operation at TA = 25°C. For higher temperature, the current doubles every 10°C.
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
AD743 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.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Internal Power Dissipation2
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . .+VS and –VS
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Operating Temperature Range
AD743J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0°C to 70°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . .300°C
NOTESStresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.8-lead PDIP: �JA = 100°C/W, �JC = 30°C/W.
16-lead SOIC: �JA = 100°C/W, �JC = 30°C/W.
ESD SUSCEPTIBILITYAn ESD classification per method 3015.6 of MIL-STD-883C has
been performed on the AD743. The AD743 is a Class 1 device,
passing at 1000 V and failing at 1500 V on null Pins 1 and 5,
when tested, using an IMCS 5000 automated ESD tester. Pins
other than null pins fail at greater than 2500V.
ORDERING GUIDEAD743JN
AD743JR-16
AD743JR-16-REEL
*N = PDIP; R = SOIC.
AD743–Typical Performance CharacteristicsTPC 1. Input Voltage Swing vs.
Supply Voltage
TPC 4. Quiescent Current vs.
Supply Voltage
TPC 7. Input Bias Current vs.
Common-Mode Voltage
(@ 25�C, VS = 15 V)10
SUPPLY VOLTAGE (�V)
OUTPUT VOLTAGE SWING (V)20TPC 2. Output Voltage Swing
vs. Supply Voltage
TEMPERATURE (�C)
INPUT BIAS CURRENT (A)
10–6TPC 5. Input Bias Current vs.
Temperature
TPC 8. Short Circuit Current
Limit vs. Temperature
TPC 3. Output Voltage Swing
vs. Load Resistance
TPC 6. Output Impedance vs.
Frequency (Closed-Loop Gain = –1)
TPC 9. Gain Bandwidth Product
vs. Temperature
TPC 10. Open-Loop Gain and
Phase vs. Frequency
TPC 13. Common-Mode
Rejection vs. Frequency
TPC 16. Total Harmonic Distortion
vs. Frequency
TEMPERATURE (�C)
SLEW RATE (V/
3.5TPC 11. Slew Rate vs. Temperature
(Gain = –1)
TPC 14. Power Supply Rejection
vs. Frequency
TPC 17. Input Voltage Noise
Spectral Density
SUPPLY VOLTAGE (�V)
OPEN-LOOP GAIN (dB)20
100TPC 12. Open-Loop Gain vs.
Supply Voltage, RLOAD = 2 kΩ
TPC 15. Large Signal Frequency
Response
TPC 18. Input Current Noise
Spectral Density
AD743TPC 19. Typical Noise Distribution @ 10 kHz (602 Units)
TPC 20. Offset Null Configuration
TPC 21. Unity-Gain Follower
TPC 23. Unity-Gain Follower Small
Signal Pulse Response
TPC 24. Unity-Gain Inverter
TPC 25. Unity-Gain Inverter Large Signal Pulse Response
