Datasheet AD8225 (Analog Devices)

Precision Gain of 5 Instrumentation Amplifier AD8225 FEATURES FUNCTIONAL BLOCK DIAGRAM No External Components Required Highly Stable, Factory Trimmed Gain of 5 AD8225 NC 1 8 NC Low Power, 1.2 mA Max Supply Current –IN 2 7 +VS Wide Power Supply Range ( 1.7 V to 18 V) +IN 3 6 V Single- and Dual-Supply Operation OUT –V 4 5 S REF Excellent Dynamic Performance High CMRR NC = NO CONNECT 86 dB Min @ DC 80 dB Min to 10 kHz Wide Bandwidth 900 kHz 4 V to 36 V Single Supply High Slew Rate 140 5 V/ s Min 130 Outstanding DC Precision 120 Low Gain Drift 110 5 ppm/ C Max 100 Low Input Offset Voltage AD8225 90 150 V Max HIGH PERFORMANCE IN AMP Low Offset Drift 80 @ GAIN OF 5 CMRR – dB 2 V/ C Max 70 Low Input Bias Current 60 1.2 nA Max 50 APPLICATIONS 40 Patient Monitors 30 Current Transmitters 1 10 100 1k 10k 100k FREQUENCY – Hz Multiplexed Systems 4 to 20 mA Converters
Figure 1. Typical CMRR vs. Frequency
Bridge Transducers Sensor Signal Conditioning GENERAL DESCRIPTION
The AD8225 is an instrumentation amplifier with a fixed gain CMRR performance of the AD8225 rejects noise from utility of 5, which sets new standards of performance. The superior systems, motors, and repair equipment on factory floors, switch- CMRR of the AD8225 enables rejection of high frequency ing power supplies, and medical equipment. common-mode voltage (80 dB Min @ 10 kHz). As a result, Low input bias currents combined with a high slew rate of 5 V/µs 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 µV and drift of 2 µV/°C. Gain drift is signals in the presence of high common-mode dc voltage levels 5 ppm/°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. Good CMRR performance over frequency is necessary if power The AD8225 is packaged in an 8-lead SOIC package and is system generated noise is to be rejected. The dc to 10 kHz specified over the standard industrial temperature range, –40°C to +85°C. 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 may result from its use. No license is granted by implication or otherwise
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS PIN FUNCTION DESCRIPTIONS ORDERING GUIDE Typical Performance Characteristics Test Circuits THEORY OF OPERATION 47pF 2 5 200mV APPLICATIONS Precision V-to-I Converter Driving a High Resolution ADC Using the Reference Input AD8225 Used as an EKG Front End Benefits of Fast Slew Rates Evaluation Board OUTLINE DIMENSIONS Revision History