AD795KN Analog Devices, AD795KN Datasheet

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AD795KN

Manufacturer Part Number
AD795KN
Description
Low Power/ Low Noise Precision FET Op Amp
Manufacturer
Analog Devices
Datasheet

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Part Number:
AD795KN/JN
Manufacturer:
AD
Quantity:
5 510
a
PRODUCT 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 10
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 V maximum offset volt-
age, along with low supply current of 1.5 mA max.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Low Power Replacement for Burr-Brown
OPA-111, OPA-121 Op Amps
Low Noise
High DC Accuracy
Available in Low Cost Plastic Mini-DIP and Surface
APPLICATIONS
Low Noise Photodiode Preamps
CT Scanners
Precision l-to-V Converters
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
250 V max Offset Voltage
3 V/ C max Drift
1 pA max Input Bias Current
Low Power: 1.5 mA max Supply Current
Mount (SOIC) Packages
100
1k
10
1
10
AD795 Voltage Noise Spectral Density
100
14
FREQUENCY – Hz
common-mode impedance
1k
10k
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Furthermore, the AD795 features a guaranteed low input noise
of 2.5 V 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 V/ 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
50
40
30
20
10
0
–5
8-Pin Plastic Mini-DIP (N) Package
SAMPLE SIZE = 570
30
25
15
20
10
–4
5
0
10
CONNECTION DIAGRAMS
V
8-Pin SOIC (R) Package
s
–V
INPUT OFFSET VOLTAGE DRIFT – V/ C
–3
Precision FET Op Amp
+IN
Low Power, Low Noise
–IN
= ±15V
NC
S
NC = NO CONNECT
1
2
3
4
–2
LOAD RESISTANCE –
100
AD795
–1
0
8
7
6
5
1k
NC
+V
OUTPUT
NC
1
S
2
AD795
10k
3
Fax: 617/326-8703
4
5

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AD795KN Summary of contents

Page 1

... FREQUENCY – Hz AD795 Voltage Noise Spectral Density REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

AD795–SPECIFICATIONS Parameter Conditions 1 INPUT OFFSET VOLTAGE Initial Offset Offset T MIN vs. Temperature vs. Supply (PSRR) vs. Supply (PSRR) T MIN 2 INPUT BIAS CURRENT Either Input V CM Either Input @ MAX CM Either Input ...

Page 3

... Therefore, proper ESD precautions are recommended avoid any performance degradation or loss of functionality. ORDERING GUIDE Model Temperature Range AD795JN +70 C AD795KN +70 C AD795JR + Plastic mini-DIP SOIC package. –3– AD795 Package Option* N-8 N-8 R-8 ...

Page 4

AD795–Typical Characteristics 10k SUPPLY VOLTAGE – ±Volts Figure 1. Common-Mode Voltage Range vs. Supply ±15V 100 ...

Page 5

COMMON MODE VOLTAGE – Volts Figure 7. Input Bias Current vs. Common-Mode Voltage 1kHz 12.5 VOLTAGE NOISE 10 CURRENT NOISE 7 ...

Page 6

AD795–Typical Characteristics 30 25 – OUTPUT CURRENT OUTPUT CURRENT 10 5 –60 –40 – TEMPERATURE – Figure 13. Short Circuit Current Limit vs. Temperature 1000 900 800 700 600 500 400 300 200 ...

Page 7

FREQUENCY – Hz Figure 19. Large Signal Frequency Response – 3Vrms 10k –70 L –80 –90 –100 –110 –120 100 1k FREQUENCY – Hz Figure 21. ...

Page 8

AD795 10k +V 0 10k AD795 100pF 10k 4 0.1 F –V S Figure 24. Unity Gain Inverter +V 0 AD795 6 OUT V ...

Page 9

CIRCUIT BOARD NOTES The AD795 is designed for throughhole mounting on PC boards, using either mini-DIP or surface mount (SOIC). Maintaining picoampere resolution in those environments requires a lot of care. Both the board and the amplifier’s package have finite ...

Page 10

AD795 Leakage through the bulk of the circuit board will still occur with the guarding schemes shown in Figures 31 and 32. Stan- dard “G10” type printed circuit board material may not have high enough volume resistivity to hold leakages ...

Page 11

AC RESPONSE WITH HIGH VALUE SOURCE AND FEEDBACK RESISTANCE Source and feedback resistances greater than 100 k will magnify the effect of input capacitances (stray and inherent to the AD795) on the ac behavior of the circuit. The effects of ...

Page 12

... In order to achieve the low input bias currents of the AD795 not possible to use the same on-chip protection as used in other Analog Devices op amps. This makes the AD795 sensitive to handling and precautions should be taken to minimize ESD exposure whenever possible. ...

Page 13

GUARD 2 AD795 PHOTODIODE 3 8 Figure 43. The AD795 Used as a Photodiode Preamplifier Preamplifier Applications The low input current and offset voltage levels of the AD795 together with its low voltage noise make this amplifier ...

Page 14

AD795 & SIGNAL BANDWIDTH WITH FILTER NO FILTER 100nV 10nV 1 10 100 FREQUENCY – Hz Figure 46. Voltage Noise Spectral Density of the Circuit of Figure ...

Page 15

Low nV kHz) N Fast Audio Precision Amplifiers (SR 45 V/µs) OP61 OP275 SSM2015 SSM2016 Faster SSM2017 (SR 230 V/µs) SSM2134 SSM2139 AD5539 AD829 AD840 AD844 AD846 AD848 AD849 Ultrafast (SR 1000 V/µs) ...

Page 16

AD795 0.244 (6.20) 0.228 (5.79) 0.010 (0.25) 0.004 (0.10) All brand or product names mentioned are trademarks or registered trademarks of their respective holders. OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic Mini-DIP (N) Package 8 5 0.25 (6.35) ...

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