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PDF AD795 Data sheet ( Hoja de datos )
| Número de pieza | AD795 | |
| Descripción | Low Power/ Low Noise Precision FET Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Low power replacement for Burr-Brown
OPA111, OPA121 op amps
Low noise
3.3 μV p-p maximum, 0.1 Hz to 10 Hz
11 nV/√Hz maximum at 10 kHz
0.6 fA/√Hz at 1 kHz
High dc accuracy
500 μV maximum offset voltage
10 μV/°C maximum drift
2 pA maximum input bias current
Low power: 1.5 mA maximum supply current
APPLICATIONS
Low noise photodiode preamps
CT scanners
Precision l-to-V converters
GENERAL DESCRIPTION
The 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 guaranteed
and tested maximum input voltage noise. It features 2 pA
maximum input bias current and 500 μV maximum offset
voltage, along with low supply current of 1.5 mA maximum.
1k
100
10
1
10 100 1k
FREQUENCY (Hz)
Figure 2. Voltage Noise Spectral Density
10k
Low Power, Low Noise
Precision FET Op Amp
AD795
CONNECTION DIAGRAM
NC 1
8 NC
–IN 2
+IN 3
7 +VS
6 OUTPUT
–VS 4 AD795 5 NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R) Package
Furthermore, the AD795 features a guaranteed low input noise
of 3.3 μV p-p (0.1 Hz to 10 Hz) and a 11 nV/√Hz maximum
noise level at 10 kHz. The AD795 has a fully specified and
tested input offset voltage drift of only 10 μV/°C maximum.
The AD795 is useful for many high input impedance, low noise
applications. The AD795 is rated over the commercial tempera-
ture range of 0°C to +70°C.
The AD795 is available in an 8-lead SOIC package.
50
SAMPLE SIZE = 570
40
30
20
10
0
–5 –4 –3 –2 –1 0 1 2 3 4
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
5
Figure 3. Typical Distribution of Average Input Offset Voltage Drift
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2002–2009 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Internal Power Dissipation (at TA = +25°C)
SOIC Package
Input Voltage
Input Current1
Output Short-Circuit Duration
Differential Input Voltage
Storage Temperature Range (R)
Operating Temperature Range
AD795J
Rating
±18 V
500 mW
±VS
±10 mA
Indefinite
+VS and −VS
−65°C to +125°C
0°C to +70°C
1 Limit input current to 10 mA or less whenever the input signal exceeds the
power supply rail by 0.1 V.
AD795
Stresses above those listed under Absolute Maximum Ratings
may cause permanent 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.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered on a 4-layer circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
8-Lead SOIC
θJA
155
Unit
°C/W
ESD CAUTION
Rev. C | Page 5 of 20
5 Page 
MINIMIZING INPUT CURRENT
The AD795 is guaranteed to 1 pA maximum input current
with ±15 V supply voltage at room temperature. Careful atten-
tion to how the amplifier is used is necessary to maintain this
performance.
The amplifier’s operating temperature should be kept as low as
possible. Like other JFET input amplifiers, the AD795’s input
current doubles for every 10°C rise in junction temperature
AD795
(illustrated in Figure 9). On-chip power dissipation raises the
device operating temperature, causing an increase in input
current. Reducing supply voltage to cut power dissipation
reduces the AD795’s input current (see Figure 7). Heavy output
loads can also increase junction temperature; maintaining a
minimum load resistance of 10 kΩ is recommended.
Rev. C | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD795.PDF ] | |
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