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AD795JR-REEL-AD795JRZ
Low Power, Low Noise Precision FET Op Amp
CONNECTION DIAGRAMS
8-Pin SOIC (RN) PackageREV.B
Low Power, Low Noise
Precision FET Op Amp
FEATURES
Low Power Replacement for Burr-Brown
OPA-111, OPA-121 Op Amps
Low Noise
2.5 �V p-p max, 0.1 Hz to 10 Hz
11 nV/÷Hz max at 10 kHz
0.6 fA/÷Hz at 1 kHz
High DC Accuracy
250 �V max Offset Voltage
3 �V/�C max Drift
1 pA max Input Bias Current
Low Power: 1.5 mA max Supply Current
APPLICATIONS
Low Noise Photodiode Preamps
CT Scanners
Precision l-to-V Converters
PRODUCT DESCRIPTIONThe AD795 is a low noise, precision, FET input operational
amplifier. It offers both the low voltage noise and low offset drift
of a bipolar input op amp and the very low bias current of a
FET-input device. The 1014 W common-mode impedance
insures that input bias current is essentially independent of
common-mode voltage and supply voltage variations.
The AD795 has both excellent dc performance and a guaran-
teed and tested maximum input voltage noise. It features 1 pA
maximum input bias current and 250 mV maximum offset volt-
age, along with low supply current of 1.5 mA max.
AD795 Voltage Noise Spectral Density
Furthermore, the AD795 features a guaranteed low input noise
of 2.5 mV p-p (0.1 Hz to 10 Hz) and a 11 nV/÷Hz max noise
level at 10 kHz. The AD795 has a fully specified and tested
input offset voltage drift of only 3 mV/∞C max.
The AD795 is useful for many high input impedance, low noise
applications. The AD795J and AD795K are rated over the
commercial temperature range of 0∞C to +70∞C.
The AD795 is available in 8-pin SOIC.
Typical Distribution of Average Input Offset Voltage Drift
AD795–SPECIFICATIONS
(@ +25�C and �15 V dc unless otherwise noted)
NOTESInput offset voltage specifications are guaranteed after 5 minutes of operation at TA = +25∞C.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.Gain = –1, R1 = 10 kW.Defined as the time required for the amplifier’s output to return to normal operation after removal of a 50% overload from the amplifier input.Defined as the maximum continuous voltage between the inputs such that neither input exceeds ±10 V from ground.
All min and max specifications are guaranteed.
Specifications subject to change without notice.
AD795
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Internal Power Dissipation2 (@ TA = +25∞C)
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .500 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±VS
Output Short Circuit Duration . . . . . . . . . . . . . . . .Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . .+VS and –VS
Storage Temperature Range (R) . . . . . . . . .–65∞C to +125∞C
Operating Temperature Range
AD795J . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0∞C to +70∞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.8-Pin Small Outline Package: qJA = 155∞C/Watt
ORDERING GUIDE*N = Plastic mini-DIP; R = SOIC package.
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 AD795 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.
AD795–Typical Performance CharacteristicsFigure 1.Common-Mode Voltage Range vs. Supply
Figure 3.Output Voltage Swing vs. Load Resistance
Figure 5.Typical Distribution of Input Bias Current
Figure 2.Output Voltage Range vs. Supply Voltage
Figure 4.Input Bias Current vs. Supply
Figure 6.Input Bias Current vs. Temperature
Figure 8.Input Bias Current vs. Differential Input Voltage
Figure 10.
+15
+10+50–5
INPUT BIAS CURRENT
– pA
COMMON MODE VOLTAGE – VoltsFigure 7.Input Bias Current vs. Common-Mode Voltage
Figure 9.Voltage and Current Noise Spectral Density vs.
Temperature
AD795Figure 14. Output Swing and Error vs. Settling Time
FREQUENCY – Hz
POWER SUPPLY REJECTION
11010M1M100k10k1k100
100Figure 16. Power Supply Rejection vs. Frequency
10M
100100k10k1k
FREQUENCY – Hz
OPEN-LOOP GAIN – dB
PHASE MARGIN – Degrees
100Figure 18. Open-Loop Gain & Phase Margin vs. Frequency
Figure 13. Short Circuit Current Limit vs. Temperature
INPUT COMMON MODE VOLTAGE – Volts
ABSOLUTE INPUT ERROR VOLTAGE – Figure 15. Absolute Input Error Voltage vs. Input
Common-Mode Voltage
FREQUENCY – Hz
COMMON MODE REJECTION
– dB
11010M1M100k10k1k100
100Figure 17. Common-Mode Rejection vs. Frequency
Figure 20.Closed-Loop Output Impedance vs. Frequency
Figure 22.Quiescent Supply Current vs. Supply
Voltage Drift
Figure 19.Large Signal Frequency Response
FREQUENCY – Hz
THD – dB
1001k100k10k
–70Figure 21.Total Harmonic Distortion vs. Frequency
Figure 23. Typical Distribution of Input Offset Voltage
AD795Figure 25. Unity Gain Inverter
Large Signal Pulse Response
Figure 28. Unity Gain Follower
Large Signal Pulse Response
10kW
VIN
–VS
VOUTFigure 24. Unity Gain Inverter
Figure 27. Unity Gain Follower
Figure 26. Unity Gain Inverter
Small Signal Pulse Response
Figure 29. Unity Gain Follower
Small Signal Pulse Response
MINIMIZING INPUT CURRENTThe AD795 is guaranteed to 1 pA max input current with ±15
volt supply voltage at room temperature. Careful attention to
how the amplifier is used will maintain or possibly better this
performance.
The amplifier’s operating temperature should be kept as low as
possible. Like other JFET input amplifier’s, the AD795’s input
current will double for every 10∞C rise in junction temperature
(illustrated in Figure 6). On-chip power dissipation will raise the
device operating temperature, causing an increase in input
current. Reducing supply voltage to cut power dissipation will
reduce the AD795’s input current (Figure 4). Heavy output
loads can also increase chip temperature, maintaining a
minimum load resistance of 10 kW is recommended.
