Precision Gain of 5 Instrumentation Amplifier AD8225 FEATURES FUNCTIONAL BLOCK DIAGRAM No External Components Required AD8225 Highly Stable, Factory Trimmed Gain of 5 1 8 NC NC Low Power, 1.2 mA Max Supply Current IN 2 7 +V S Wide Power Supply Range ( 1.7 V to 18 V) 3 6 +IN V OUT Single- and Dual-Supply Operation V 4 5 S REF Excellent Dynamic Performance NC = NO CONNECT High CMRR 86 dB Min DC 80 dB Min to 10 kHz Wide Bandwidth 900 kHz 4 V to 36 V Single Supply 140 High Slew Rate 130 5 V/ s Min 120 Outstanding DC Precision Low Gain Drift 110 5 ppm/ C Max 100 AD8225 Low Input Offset Voltage 90 150 V Max HIGH PERFORMANCE IN AMP 80 Low Offset Drift GAIN OF 5 70 2 V/ C Max Low Input Bias Current 60 1.2 nA Max 50 40 APPLICATIONS Patient Monitors 30 1 10 100 1k 10k 100k Current Transmitters FREQUENCY Hz Multiplexed Systems Figure 1. Typical CMRR vs. Frequency 4 to 20 mA Converters Bridge Transducers Sensor Signal Conditioning GENERAL DESCRIPTION CMRR performance of the AD8225 rejects noise from utility The AD8225 is an instrumentation amplifier with a fixed gain systems, motors, and repair equipment on factory floors, switch- of 5, which sets new standards of performance. The superior ing power supplies, and medical equipment. CMRR of the AD8225 enables rejection of high frequency common-mode voltage (80 dB Min 10 kHz). As a result, Low input bias currents combined with a high slew rate of 5 V/s higher ambient levels of noise from utility lines, industrial make the AD8225 ideally suited for multiplexed applications. equipment, and other radiating sources are rejected. Extended The AD8225 provides excellent dc precision, with maximum CMV range enables the AD8225 to extract low level differential input offset voltage of 150 V and drift of 2 V/C. Gain drift is signals in the presence of high common-mode dc voltage levels 5ppm/C or less. even at low supply voltages. Operating on either single or dual supplies, the fixed gain of 5 Ambient electrical noise from utility lines is present at 60 Hz and wide input common-mode voltage range make the AD8225 and harmonic frequencies. Power systems operating at 400 Hz well suited for patient monitoring applications. create high noise environments in aircraft instrument clusters. The AD8225 is packaged in an 8-lead SOIC package and is Good CMRR performance over frequency is necessary if power specified over the standard industrial temperature range, 40C system generated noise is to be rejected. The dc to 10 kHz to +85C. 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 that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and Fax: 781/326-8703 2003 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective companies. CMRR dB(T = 25 C, V = 15 V, R = 2 k , unless otherwise noted.) AD8225SPECIFICATIONS A S L Parameter Conditions Min Typ Max Unit GAIN Gain 5V/V Gain Error 0.1 +0.05 +0.1 % Nonlinearity 2 10 ppm vs. Temperature 1 5 ppm/C OFFSET VOLTAGE (RTI) Offset Voltage 50 150 V vs. Temperature 0.3 2 V/C vs. Supply (PSRR) 90 100 dB INPUT Input Operating Impedance 2G pF Differential 10 Common Mode 10 2G pF Input Voltage Range V + 1.6 +V 1.0 V S S (Common-Mode) vs. Temperature V + 2.2 +V 1.2 V S S Input Bias Current 0.5 1.2 nA vs. Temperature 3 pA/C Input Offset Current 0.15 0.5 nA vs. Temperature 1.5 pA/C Common-Mode Rejection Ratio 86 94 dB T = T to T 83 dB A MIN MAX f = 10 kHz* 80 dB OUTPUT Operating Voltage Range R = 2 k V + 1.4 +V 1.4 V L S S vs. Temperature V + 1.5 +V 1.6 V S S Operating Voltage Range R = 10 k V + 1.0 +V 1.1 V L S S vs. Temperature V + 1.2 +V 1.0 V S S Short Circuit Current 18 mA DYNAMIC RESPONSE Small Signal 3 dB Bandwidth 900 kHz Full Power Bandwidth V = 20 V p-p 75 kHz OUT Settling Time (0.01%) 10 V Step 3.4 s Settling Time (0.001%) 10 V Step 4.8 s Slew Rate 5 V/s NOISE (RTI) Voltage 0.1 Hz to 10 Hz 1.5 V p-p Spectral Density, 1 kHz 45 nV/Hz Current 0.1 Hz to 10 Hz 4 pA p-p Spectral Density, 1 kHz 50 fA/Hz REFERENCE INPUT R V , V = 0 18 k IN IN+ REF I 60 A IN Voltage Range V + 1.4 +V 1.4 V S S Gain to Output 0.999 1 1.001 POWER SUPPLY Operating Range 1.7 18 V Quiescent Current 1.05 1.2 mA TEMPERATURE RANGE For Specified Performance 40 +85 C *Pin 1 connected to Pin 4. See Applications section. Specifications subject to change without notice. 2 REV. A