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AD8225AR
Precision Gain of 5 Instrumentation Amplifier
REV.A
Precision Gain of 5
Instrumentation Amplifier
FEATURES
No External Components Required
Highly Stable, Factory Trimmed Gain of 5
Low Power, 1.2 mA Max Supply Current
Wide Power Supply Range (�1.7 V to �18 V)
Single- and Dual-Supply Operation
Excellent Dynamic Performance
High CMRR
86 dB Min @ DC
80 dB Min to 10 kHz
Wide Bandwidth
900 kHz
4 V to 36 V Single Supply
High Slew Rate
5 V/�s Min
Outstanding DC Precision
Low Gain Drift
5 ppm/�C Max
Low Input Offset Voltage
150 �V Max
Low Offset Drift
2 �V/�C Max
Low Input Bias Current
1.2 nA Max
APPLICATIONS
Patient Monitors
Current Transmitters
Multiplexed Systems
4 to 20 mA Converters
Bridge Transducers
Sensor Signal Conditioning
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe AD8225 is an instrumentation amplifier with a fixed gain
of 5, which sets new standards of performance. The superior
CMRR of the AD8225 enables rejection of high frequency
common-mode voltage (80dB Min @ 10 kHz). As a result,
higher ambient levels of noise from utility lines, industrial
equipment, and other radiating sources are rejected. Extended
CMV range enables the AD8225 to extract low level differential
signals in the presence of high common-mode dc voltage levels
even at low supply voltages.
Ambient electrical noise from utility lines is present at 60Hz
and harmonic frequencies. Power systems operating at 400Hz
create high noise environments in aircraft instrument clusters.
Good CMRR performance over frequency is necessary if power
system generated noise is to be rejected. The dc to 10kHz
Figure 1. Typical CMRR vs. Frequency
CMRR performance of the AD8225 rejects noise from utility
systems, motors, and repair equipment on factory floors, switch-
ing power supplies, and medical equipment.
Low input bias currents combined with a high slew rate of 5V/µs
make the AD8225 ideally suited for multiplexed applications.
The AD8225 provides excellent dc precision, with maximum
input offset voltage of 150µV and drift of 2µV/°C. Gain drift is
5ppm/°C or less.
Operating on either single or dual supplies, the fixed gain of 5
and wide input common-mode voltage range make the AD8225
well suited for patient monitoring applications.
The AD8225 is packaged in an 8-lead SOIC package and is
specified over the standard industrial temperature range, –40°C
to +85°C.
AD8225–SPECIFICATIONS(TA = 25�C, VS = �15 V, RL = 2 k�, unless otherwise noted.)REFERENCE INPUT
*Pin 1 connected to Pin 4. See Applications section.
Specifications subject to change without notice.
AD8225REFERENCE INPUT
SPECIFICATIONS(TA = 25�C, VS = �5 V, RL = 2 k�, unless otherwise noted.)
AD8225REFERENCE INPUT
SPECIFICATIONS(TA = 25�C, VS = 5 V, RL = 2 k�, unless otherwise noted.)
PIN FUNCTION DESCRIPTIONS
ABSOLUTE MAXIMUM RATINGS*Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 650 mW
Input Voltage (Common-Mode) . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±25 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature . . . . . . . . . . . . . . . . . . –65ºC to +125ºC
Operating Temperature Range . . . . . . . . . . . –40ºC to +85ºC
Lead Temperature Range (10 sec Soldering) . . . . . . . . . 300ºC
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only and 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.
Figure 2. Maximum Power Dissipation vs. Temperature
ORDERING GUIDE
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
AD8225 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.
AD8225–Typical Performance CharacteristicsTPC 1. Typical Distribution of Input Offset Voltage,
VS = ±15 V
TPC 2. Typical Distribution of Input Bias Current,
VS = ±15 V
TPC 3. Typical Distribution of Input Offset Current,
VS = ±15 V
TPC 4. Bias Current vs. Temperature
TPC 5. Offset Voltage vs. Warm-Up Time
TPC 6. Voltage Noise Spectral Density vs. Frequency (RTI)
(TA = 25�C, RL = 2 k�, VS = �15 V, unless otherwise noted.)
TPC 7. Input Current Noise Spectral Density vs.
Frequency
TPC 8. 0.1 Hz to 10 Hz Voltage Noise, RTI
TIME – sec
CURRENT NOISE – 2pA/divTPC 9. 0.1 Hz to 10 Hz Current Noise
TPC 10. CMR vs. Frequency, RTI
TPC 11. CMRR vs. Temperature
TPC 12. CMV Range vs. VOUT, Dual Supplies
AD8225TPC 13. CMV vs. VOUT, Single Supply
TPC 14. PSRR vs. Frequency, RTI
TPC 15. Small Signal Frequency Response,
VOUT = 200 mV p-p
TPC 16. Large Signal Frequency Response,
VOUT = 4 V p-p
TPC 17. Input Common Mode Voltage Range vs.
Supply Voltage
TPC 18. Output Voltage Swing vs. Supply Voltage
and Load Resistance
