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AD820AN-AD820AR-AD820AR-3V-AD820BN-AD820BR
Single Supply, Rail to Rail Low Power FET-Input Op Amp
CONNECTION DIAGRAMS
8-Lead Plastic Mini-DIP 8-Lead SOIC

REV.BSingle Supply, Rail to Rail
Low Power FET-Input Op Amp
FEATURES
True Single Supply Operation
Output Swings Rail-to-Rail
Input Voltage Range Extends Below Ground
Single Supply Capability from +3 V to +36 V
Dual Supply Capability from 61.5 V to 618 V
Excellent Load Drive
Capacitive Load Drive Up to 350 pF
Minimum Output Current of 15 mA
Excellent AC Performance for Low Power
800 mA Max Quiescent Current
Unity Gain Bandwidth: 1.8 MHz
Slew Rate of 3.0 V/ms
Excellent DC Performance
800 mV Max Input Offset Voltage
1 mV/8C Typ Offset Voltage Drift
25 pA Max Input Bias Current
Low Noise
13 nV/√Hz @ 10 kHz
APPLICATIONS
Battery Powered Precision Instrumentation
Photodiode Preamps
Active Filters
12- to 14-Bit Data Acquisition Systems
Medical Instrumentation
Low Power References and Regulators
PRODUCT DESCRIPTION

The AD820 is a precision, low power FET input op amp that
can operate from a single supply of +3.0 V to 36 V, or dual
supplies of –1.5 V to –18 V. It has true single supply capability
with an input voltage range extending below the negative rail,108765432
INPUT BIAS CURRENT – pA
NUMBER OF UNITS

Figure 1.Typical Distribution of Input Bias Current
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 mV max, offset voltage drift of 1 mV/°C, typ
input bias currents below 25 pA and low input voltage noise
provide dc precision with source impedances up to a Gigaohm.
1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz and
3 V/ms slew rate are provided for a low supply current of
800 mA. 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 outstand-
ing load drive capability, results in an exceptionally versatile
amplifier for the single supply user.
The AD820 is available in three performance grades. The A and
B grades are rated over the industrial temperature range of
–40°C to +85°C. There is 3 V grade—the AD820A-3V, rated
over the industrial temperature range.
The AD820 is offered in two varieties of 8-lead package: plastic
DIP, and surface mount (SOIC).
Figure 2.Gain of +2 Amplifier; VS = +5, 0, VIN = 2.5 V Sine
Centered at 1.25 Volts
AD820–SPECIFICATIONS(VS = 0, 5 volts @ TA = +258C, VCM = 0 V, VOUT = 0.2 V unless otherwise noted)
NOISE/HARMONIC PERFORMANCE
OUTPUT CHARACTERISTICS
AD820
(VS = +5 volts @ TA = +258C, VCM = 0 V, VOUT = 0 V unless otherwise noted)

NOISE/HARMONIC PERFORMANCE
OUTPUT CHARACTERISTICS
NOISE/HARMONIC PERFORMANCE
OUTPUT CHARACTERISTICS
POWER SUPPLY
AD820–SPECIFICATIONS
(VS = 615 volts @ TA = +258C, VCM = 0 V, VOUT = 0 V unless otherwise noted)
(VS = 0, 3 volts @ TA = +258C, VCM = 0 V, VOUT = 0.2 V unless otherwise noted)
NOISE/HARMONIC PERFORMANCE
AD820
AD820–SPECIFICATIONS
NOTESThis is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range (+VS – 1 V) to +VS.
Common-mode error voltage is typically less than 5 mV with the common-mode voltage set at 1 volt below the positive supply.VOL–VEE is defined as the difference between the lowest possible output voltage (VOL) and the minus voltage supply rail (VEE).
VCC–VOH is defined as the difference between the highest possible output voltage (VOH) and the positive supply voltage (VCC).
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS1

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–18 V
Internal Power Dissipation2
Plastic DIP (N) . . . . . . . . . . . . . . . . . . . . . . . . . .1.6 Watts
SOIC (R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0 Watts
Input Voltage . . . . . . . . . . . . . .(+VS + 0.2 V) to – (20 V + VS)
Output Short Circuit Duration . . . . . . . . . . . . . . . .Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . .–30 V
Storage Temperature Range (N) . . . . . . . . .–65°C to +125°C
Storage Temperature Range (R) . . . . . . . . .–65°C to +150°C
Operating Temperature Range
AD820A/B . . . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C
Lead Temperature Range
(Soldering 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+260°C
NOTESStresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.8-Lead Plastic DIP Package: qJA = 90°C/Watt
8-Lead SOIC Package: qJA = 160°C/Watt
ORDERING GUIDE
CAUTION

ESD (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 AD820 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.
OFFSET VOLTAGE – mV
NUMBER OF UNITS

Figure 3.Typical Distribution of Offset Voltage (248 Units)
Figure 4.Typical Distribution of Offset Voltage Drift
(120 Units)108765432
INPUT BIAS CURRENT – pA
NUMBER OF UNITS

Figure 5.Typical Distribution of Input Bias Current
(213 Units)
Figure 6.Input Bias Current vs. Common-Mode
Voltage; VS = +5 V, 0 V and VS = –5 V
Figure 7.Input Bias Current vs. Common-Mode
Voltage; VS = –15 V
Figure 8.Input Bias Current vs. Temperature;
VS = 5 V, VCM = 0
10M
100k
10k
1001k100k10k
LOAD RESISTANCE – V
OPEN-LOOP GAIN –V/V

Figure 9.Open-Loop Gain vs. Load Resistance
10M
100k
10k
TEMPERATURE – 8C
OPEN-LOOP GAIN – V/V

Figure 10.Open-Loop Gain vs. Temperature
OUTPUT VOLTAGE – Volts
INPUT VOLTAGE –

Figure 11.Input Error Voltage vs. Output Voltage for
Resistive Loads
Figure 12.Input Error Voltage with Output Voltage within
300 mV of Either Supply Rail for Various Resistive Loads;
VS = –5 V
10010k1k1001
FREQUENCY – Hz
INPUT VOLTAGE NOISE – nV/

Figure 13.Input Voltage Noise vs. Frequency
Figure 14.Total Harmonic Distortion vs. Frequency
AD820–Typical Characteristics
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