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PDF AD820 Data sheet ( Hoja de datos )
| Número de pieza | AD820 | |
| Descripción | FET Input Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
True single-supply operation
Output swings rail-to-rail
Input voltage range extends below ground
Single-supply capability from 5 V to 30 V
Dual-supply capability from ±2.5 V to ±15 V
Excellent load drive
Capacitive load drive up to 350 pF
Minimum output current of 15 mA
Excellent ac performance for low power
800 μA maximum quiescent current
Unity-gain bandwidth: 1.8 MHz
Slew rate of 3 V/μs
Excellent dc performance
800 μV maximum input offset voltage
2 μV/°C typical offset voltage drift
25 pA maximum input bias current
Low noise: 13 nV/√Hz @ 10 kHz
APPLICATIONS
Battery-powered precision instrumentation
Photodiode preamps
Active filters
12-bit to 14-bit data acquisition systems
Medical instrumentation
Low power references and regulators
GENERAL DESCRIPTION
The AD820 is a precision, low power FET input op amp that
can operate from a single supply of 5 V to 36 V, or dual supplies
of ±2.5 V to ±18 V. It has true single-supply capability, with an
input voltage range extending below the negative rail, allowing
the AD820 to accommodate input signals below ground in the
single-supply mode. Output voltage swing extends to within
10 mV of each rail, providing the maximum output dynamic range.
Offset voltage of 800 μV maximum, offset voltage drift of
2 μV/°C, typical input bias currents below 25 pA, and low input
voltage noise provide dc precision with source impedances up
to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at
10 kHz, and 3 V/μs slew rate are provided for a low supply
current of 800 μA. The AD820 drives up to 350 pF of direct
capacitive load and provides a minimum output current of
15 mA. This allows the amplifier to handle a wide range of load
conditions. This combination of ac and dc performance, plus
the outstanding load drive capability, results in an exceptionally
versatile amplifier for the single-supply user.
Rev. H
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Single-Supply, Rail-to-Rail,
Low Power, FET Input Op Amp
AD820
PIN CONFIGURATIONS
NULL 1
–IN 2
AD820
8 NC
7 +VS
+IN 3
6 VOUT
–VS 4 TOP VIEW 5 NULL
(Not to Scale)
NC = NO CONNECT
Figure 1. 8-Lead PDIP
NC 1
–IN 2
AD820
8 NC
7 +VS
+IN 3
6 VOUT
–VS 4 TOP VIEW 5 NC
(Not to Scale)
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N and 8-Lead MSOP
The AD820 is available in two performance grades. The A and
B grades are rated over the industrial temperature range of
−40°C to +85°C. The AD820 is offered in three 8-lead package
options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP).
1V
100
90
1V
20µs
10
0%
1V
Figure 3. Gain-of-2 Amplifier; VS = 5 V, 0 V, VIN = 2.5 V Sine Centered at 1.25 V
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 ©1996–2011 Analog Devices, Inc. All rights reserved.
1 page  
AD820
VS = ±5 V @ TA = 25°C, VCM = 0 V, VOUT = 0 V, unless otherwise noted.
Table 2.
Parameter
DC PERFORMANCE
Initial Offset
Maximum Offset over Temperature
Offset Drift
Input Bias Current
At TMAX
Input Offset Current
At TMAX
Open-Loop Gain
TMIN to TMAX
TMIN to TMAX
TMIN to TMAX
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 0.1 Hz to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
Input Current Noise
f = 0.1 Hz to 10 Hz
f = 1 kHz
Harmonic Distortion
f = 10 kHz
DYNAMIC PERFORMANCE
Unity Gain Frequency
Full Power Response
Slew Rate
Settling Time
To 0.1%
To 0.01%
INPUT CHARACTERISTICS
Common-Mode Voltage Range1
TMIN to TMAX
CMRR
TMIN to TMAX
Input Impedance
Differential
Common Mode
Conditions
Min
VCM = −5 V to +4 V
VOUT = −4 V to +4 V
RL = 100 kΩ
RL = 10 kΩ
RL = 1 kΩ
400
400
80
80
20
10
RL = 10 kΩ
VOUT = ±4.5 V
VOUT p-p = 9 V
VOUT = 0 V to ±4.5 V
VCM = −5 V to +2 V
−5.2
66
66
AD820A
Typ Max
0.1 0.8
0.5 1.5
2
2 25
0.5 5
2 20
0.5
1000
150
30
2
25
21
16
13
18
0.8
−93
1.9
105
3
1.4
1.8
+4
80
1013||0.5
1013||2.8
AD820B
Min Typ
Max Unit
0.3 0.4 mV
0.5 1 mV
2 μV/°C
2 10 pA
0.5 2.5 nA
2 10 pA
0.5 nA
400 1000
400
80 150
80
20 30
10
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
2 μV p-p
25 nV/√Hz
21 nV/√Hz
16 nV/√Hz
13 nV/√Hz
18 fA p-p
0.8 fA/√Hz
−93 dB
1.8 MHz
105 kHz
3 V/μs
1.4 μs
1.8 μs
−5.2
72 80
66
+4
1013||0.5
1013||2.8
V
dB
dB
Ω||pF
Ω||pF
Rev. H | Page 5 of 24
5 Page 
10M
1M
100k
VS = ±15V
VS = 0V, +5V
10k
100 1k 10k
LOAD RESISTANCE (Ω)
Figure 10. Open-Loop Gain vs. Load Resistance
100k
10M
RL = 100kΩ
VS = ±15V
1M VS = 0V, +5V
100k
RL = 10kΩ
RL = 600Ω
VS = ±15V
VS = 0V, +5V
VS = ±15V
VS = 0V, +5V
10k
–60
–40 –20 0 20 40 60 80 100 120
TEMPERATURE (ºC)
Figure 11. Open-Loop Gain vs. Temperature
140
300
200
100 RL = 10kΩ
0
RL = 100kΩ
–100
–200
RL = 600Ω
–300
–16 –12 –8
–4
0
4
8 12 16
OUTPUT VOLTAGE (V)
Figure 12. Input Error Voltage vs. Output Voltage for Resistive Loads
AD820
40
POSITIVE
RAIL
20 RL = 2kΩ
RL = 20kΩ
NEGATIVE
RAIL
POSITIVE
0 RAIL
POSITIVE
–20 RAIL
NEGATIVE
RAIL
–40
0
RL = 100kΩ
60 120
NEGATIVE RAIL
180 240 300
OUTPUT VOLTAGE FROM RAILS (mV)
Figure 13. Input Error Voltage vs. Output Voltage Within 300 mV of Either
Supply Rail for Various Resistive Loads; VS = ±5 V
1k
100
10
1
1 10 100 1k
FREQUENCY (Hz)
Figure 14. Input Voltage Noise vs. Frequency
10k
–40
–50 RL = 10kΩ
ACL = –1
–60
–70
–80
–90
–100
VS = ±15V; VOUT = 20V p-p
VS = ±5V; VOUT = 9V p-p
VS = 0V, +5V; VOUT = 4.5V p-p
–110
100 1k 10k
FREQUENCY (Hz)
Figure 15. Total Harmonic Distortion vs. Frequency
100k
Rev. H | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD820.PDF ] | |
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