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AD622AN-AD622AR-AD622AR-REEL
Low Cost Instrumentation Amplifier
CONNECTION DIAGRAM
REF
OUTPUT
+VS
–IN
+IN
–VSREV.C
Low Cost
Instrumentation Amplifier
FEATURES
Easy to Use
Low Cost Solution
Higher Performance than Two or Three Op Amp Design
Unity Gain with No External Resistor
Optional Gains with One External Resistor
(Gain Range 2 to 1000)
Wide Power Supply Range (62.6V to 615V)
Available in 8-Lead PDIP and SOIC
Low Power, 1.5 mA max Supply Current
GOOD DC PERFORMANCE
0.15% Gain Accuracy (G = 1)
125 mV max Input Offset Voltage
1.0 mV/8C max Input Offset Drift
5 nA max Input Bias Current
66 dB min Common-Mode Rejection Ratio (G = 1)
NOISE
12 nV/√Hz @ 1kHz Input Voltage Noise
0.60 mV p-p Noise (0.1 Hz to 10 Hz, G = 10)
EXCELLENT AC CHARACTERISTICS
800 kHz Bandwidth (G = 10)
10 ms Settling Time to 0.1% @ G = 1–100
1.2 V/ms Slew Rate
APPLICATIONS
Transducer Interface
Low Cost Thermocouple Amplifier
Industrial Process Controls
Difference Amplifier
Low Cost Data Acquisition
PRODUCT DESCRIPTIONThe AD622 is a low cost, moderately accurate instrumentation
amplifier that requires only one external resistor to set any gain
between 2 and 1,000. Or for a gain of 1, no external resistor
is required. The AD622 is a complete difference or subtracter
amplifier “system” while providing superior linearity and common-
mode rejection by incorporating precision laser trimmed resistors.
The AD622 replaces low cost, discrete, two or three op amp
instrumentation amplifier designs and offers good common-
mode rejection, superior linearity, temperature stability, reliabil-
ity, and board area consumption. The low cost of the AD622
eliminates the need to design discrete instrumentation amplifi-
ers to meet stringent cost targets. While providing a lower cost
solution, it also provides performance and space improvements.
AD622–SPECIFICATIONS
(typical @ +258C, VS = 615 V, and RL = 2 kV unless otherwise noted)
NOISE
REFERENCE INPUT
POWER SUPPLY
TEMPERATURE RANGE
NOTESDoes not include effects of external resistor RG.One input grounded. G = 1.This is defined as the same supply range that is used to specify PSR.
Specifications subject to change without notice.
AD622
AD622
ORDERING GUIDE*N = Plastic DIP, SO = Small Outline.
ABSOLUTE MAXIMUM RATINGS1SupplyVoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18V
InternalPowerDissipation2 . . . . . . . . . . . . . . . . . . . . 650 mW
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . –VS
DifferentialInputVoltage . . . . . . . . . . . . . . . . . . . . . . . –25V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Operating Temperature Range
AD622A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature Range
(Soldering10seconds) . . . . . . . . . . . . . . . . . . . . . . . +300°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.Specification is for device in free air:
8-Lead Plastic Package: qJA = 95°C/Watt
8-Lead SOIC Package: qJA = 155°C/Watt
CAUTIONESD (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 AD622 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.
Typical Characteristics(@ +258C, VS = 615 V, RL = 2 kV, unless otherwise noted)
OUTPUT OFFSET VOLTAGE – mV–0.4000.400.801.00–1.00–0.80
PERCENTAGE OF UNITSFigure 1.Typical Distribution of Output Offset Voltage
COMMON-MODE REJECTION RATIO – dB6080100120140
PERCENTAGE OF UNITSFigure 2.Typical Distribution of Common-Mode Rejection
Typical Characteristics(@ +258C, VS = 615 V, RL = 2 kV, unless otherwise noted)
WARM-UP TIME – Minutes
INPUT OFFSET VOLTAGE – Figure 3.Change in Input Offset Voltage vs. Warm-Up
Time
FREQUENCY – Hz
1000100k101001k10k
VOLTAGE NOISE – nV/Figure 4.Voltage Noise Spectral Density vs. Frequency,
(G = 1–1000)
FREQUENCY – Hz
CURRENT NOISE – fA/
100Figure 6.CMR vs. Frequency, RTI, Zero to 1kW Source
Imbalance
FREQUENCY – Hz
POSITIVE PSR – dB
0.11M1101001k10k100k
120Figure 7a.Positive PSR vs. Frequency, RTI (G = 1–1000)
FREQUENCY – Hz
NEGATIVE PSR – dB
0.11M1101001k10k100k
120
FREQUENCY – Hz
GAIN – V/V
10010M1k10k100k1M
100Figure 8.Gain vs. Frequency
1010k1001k
OUTPUT VOLTAGE SWING – Volts p-p
LOAD RESISTANCE – VFigure 9.Output Voltage Swing vs. Load Resistance
OUTPUT STEP SIZE – Volts02051015
SETTLING TIME – Figure 10.Settling Time vs. Step Size (G = 1)
GAIN
SETTLING TIME – Figure 11.Settling Time to 0.1% vs. Gain, for a 10V Step
Figure 12.Gain Nonlinearity, G = 1, RL = 10kW
(20mV = 2ppm)
–VS
INPUT
20V p-p
1kV
10T
10kV
0.01%
10kV
0.1%Figure 13.Settling Time Test Circuit
AD622–Typical Characteristics(@ +258C, VS = 615 V, RL = 2 kV, unless otherwise noted)
