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AD795JN-AD795JR-AD795KN
Low Power, Low Noise Precision FET Op Amp
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N) Package
OUTPUT VOLTAGE SWING – Volts p-p
LOAD RESISTANCE – 10k
1001k
8-Pin SOIC (R) PackageREV.A
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 mV 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 mV max Offset Voltage
3 mV/8C max Drift
1 pA max Input Bias Current
Low Power: 1.5 mA max Supply Current
Available in Low Cost Plastic Mini-DIP and Surface
Mount (SOIC) Packages
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 Ω 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 μV maximum offset volt-
age, along with low supply current of 1.5 mA max.
10010k1k
FREQUENCY – Hz
VOLTAGE NOISE SPECTRAL DENSITY – nV/AD795 Voltage Noise Spectral Density
Furthermore, the AD795 features a guaranteed low input noise
of 2.5 μV 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 μV/°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 plastic mini-DIP and 8-pin
surface mount (SOIC) packages.
Typical Distribution of Average Input Offset Voltage Drift
AD795–SPECIFICATIONS
(@ +258C and 615 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 kΩ.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
8-Pin Mini-DIP Package . . . . . . . . . . . . . . . . . . . .750 mW
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
AD795J/K . . . . . . . . . . . . . . . . . . . . . . . . . . .0°C to +70°C
NOTES
1Stresses 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.
28-Pin Plastic Mini-DIP Package: θJA = 100°C/Watt
8-Pin Small Outline Package: θJA = 155°C/Watt
ESD SUSCEPTIBILITYESD (electrostatic discharge) sensitive device. Electrostatic
charges as high as 4000 volts, which readily accumulate on the
human body and on test equipment, can discharge without
detection. Although the AD795 features proprietary ESD pro-
tection circuitry, permanent damage may still occur on these
devices if they are subjected to high energy electrostatic dis-
charges. Therefore, proper ESD precautions are recommended
to avoid any performance degradation or loss of functionality.
ORDERING GUIDE*N = Plastic mini-DIP; R = SOIC package.
AD795–Typical Characteristics SUPPLY VOLTAGE – ±Volts
INPUT COMMON MODE RANGE – ±Volts
02015Figure 1.Common-Mode Voltage Range vs. Supply
OUTPUT VOLTAGE SWING – Volts p-p
LOAD RESISTANCE – 10k
1001kFigure 3.Output Voltage Swing vs. Load Resistance
Figure 5.Typical Distribution of Input Bias Current
Figure 2.Output Voltage Range vs. Supply Voltage
2051510
SUPPLY VOLTAGE – ±Volts
INPUT BIAS CURRENT – pA
0.95Figure 4.Input Bias Current vs. Supply
Figure 6.Input Bias Current vs. Temperature
DIFFERENTIAL INPUT VOLTAGE – ±Volts
INPUT BIAS CURRENT – Amperes–5–4–3–2–101243
10–14Figure 8.Input Bias Current vs. Differential Input Voltage
Figure 10.
Figure 7.Input Bias Current vs. Common-Mode Voltage
TEMPERATURE – °C
VOLTAGE NOISE – nV/
CURRENT NOISE – fA/Figure 9.Voltage and Current Noise Spectral Density vs.
Temperature
AD795–Typical CharacteristicsFigure 14. Output Swing and Error vs. Settling Time
Figure 16. Power Supply Rejection vs. Frequency
Figure 18. Open-Loop Gain & Phase Margin vs. Frequency
TEMPERATURE – °C
SHORT CIRCUIT CURRENT – mAFigure 13. Short Circuit Current Limit vs. Temperature
Figure 15. Absolute Input Error Voltage vs. Input
Common-Mode Voltage
Figure 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
Figure 21.Total Harmonic Distortion vs. Frequency
INPUT OFFSET VOLTAGE – µV
PERCENTAGE OF UNITS
4003002001000–100–200–300Figure 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
Figure 24. Unity Gain Inverter
Figure 27. Unity Gain Follower
Figure 26. Unity Gain Inverter
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 kΩ is recommended.
