Low Cost, Single-Supply Differential Ampli er AD626 FEATURES CONNECTION DIAGRAM Pin Selectable Gains of 10 and 100 8-Lead Plastic Mini-DIP (N) True Single-Supply Operation and SOIC (R) Packages Single-Supply Range of +2.4 V to +10 V Dual-Supply Range of 1.2 V to 6 V 200k 200k Wide Output Voltage Range of 30 mV to 4.7 V +IN IN 1 8 Optional Low-Pass Filtering 1/6 ANALOG Excellent DC Performance 2 7 G = 100 GND G = 30 Low Input Offset Voltage: 500 V Max Large Common-Mode Range: 0 V to +54 V +V V 3 6 S S Low Power: 1.2 mW (V = +5 V) S 100k Good CMR of 90 dB Typ FILTER 4 = G 2 5 OUT AC Performance AD626 Fast Settling Time: 24 s (0.01%) Includes Input Protection Series Resistive Inputs (R = 200 k ) IN range of this ampli er is equal to 6 (+V 1 V) which provides a S RFI Filters Included +24 V CMR while operating from a +5 V sup ply. Fur thermore, Allows 50 V Continuous Overload the AD626 features a CMR of 90 dB typ. APPLICATIONS The ampli ers inputs are protected against continuous overload of Current Sensing up to 50 V, and RFI lters are included in the attenuator network. Interface for Pressure Transducers, Position Indicators, The output range is +0.03 V to +4.9 V using a +5 V sup ply. The Strain Gages, and Other Low Level Signal Sources ampli er provides a preset gain of 10, but gains be tween 10 and 100 can be easily con g ured with an external re sis tor. Fur ther - more, a gain of 100 is available by connecting the G = 100 pin to PROD UCT DE SCRIP TION analog ground. The AD626 also offers low-pass lter capability by The AD626 is a low cost, true sin gle-sup ply dif fer en tial am pli er connecting a ca pac i tor between the lter pin and analog ground. de signed for am pli fy ing and low-pass ltering small dif fer en tial voltages from sources having a large common-mode voltage. The AD626A and AD626B operate over the industrial tem per a ture range of 40C to +85C. The AD626 is available in two 8-lead The AD626 can operate from either a single supply of +2.4 V to packages: a plastic mini-DIP and SOIC. +10 V, or dual supplies of 1.2 V to 6 V. The input common-mode 140 25 120 20 100 G = 10, 100 V FOR SINGLE V = +5V CM 15 S 80 AND DUAL SUPPLIES G = 100 60 V = 5V S 10 40 G = 10 V = 5V S 5 V FOR DUAL CM 20 SUPPLIES ONLY 0 0 0.1 1 10 100 1k 10k 100k 1M 1 2 3 4 5 FREQUENCY Hz SUPPLY VOLTAGE V Figure 1. Common-Mode Rejection vs. Frequency Figure 2. Input Common-Mode Range vs. Supply REV. D Information furnished by Analog Devices is be lieved 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. that may result from its use. No license is granted by implication or other- Tel: 781/329-4700 www.analog.com wise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. Fax: 781/326-8703 2003 Analog Devices, Inc. All rights reserved. COMMON-MODE REJECTION dB INPUT COMMON-MODE RANGE V AD626SPECIFICATIONS SINGLE SUPPLY ( +V = +5 V and T = 25 C, un less oth er wise noted.) S A Model AD626A AD626B Parameter Condition Min Typ Max Min Typ Max Unit GAIN Gain Accuracy Total Error Gain = 10 V 100 mV dc 0.4 1.0 0.2 0.6 % OUT Gain = 100 V 100 mV dc 0.1 1.0 0.5 0.6 % OUT Over Temperature, T = T to T G = 10 50 30 ppm/C A MIN MAX G = 100 150 120 ppm/C Gain Linearity Gain = 10 V 100 mV dc 0.014 0.016 0.014 0.016 % OUT Gain = 100 V 100 mV dc 0.014 0.02 0.014 0.02 % OUT OFFSET VOLTAGE Input Offset Voltage 1.9 2.5 1.9 2.5 mV vs. Temperature T to T , G = 10 or 100 2.9 2.9 mV MIN MAX vs. Temperature T to T , G = 10 or 100 6 6 V/C MIN MAX vs. Supply Voltage (PSR) +PSR 74 80 74 80 dB PSR 64 66 64 66 dB COMMON-MODE REJECTION R = 10 k L +CMR Gain = 10, 100 f = 100 Hz, V = +24 V 66 90 80 90 dB CM CMR Gain = 10, 100 f = 10 kHz, V = +6 V 55 64 55 64 dB CM CMR Gain = 10, 100* f = 100 Hz, V = 2 V 60 85 73 85 dB CM COMMON-MODE VOLTAGE RANGE +CMV Gain = 10 CMR > 85 dB +24 +24 V CMV Gain = 10 CMR > 85 dB 2 2 V INPUT Input Resistance Differential 200 200 k Common-Mode 100 100 k Input Voltage Range (Common-Mode) 6 (V l) 6 (V l) V S S OUTPUT Output Voltage Swing R = 10 k L Positive Gain = 10 4.7 4.90 4.7 4.90 V Gain = 100 4.7 4.90 4.7 4.90 V Negative Gain = 10 0.03 0.03 V Gain = 100 0.03 0.03 V Short Circuit Current +I 12 12 mA SC NOISE Voltage Noise RTI Gain = 10 f = 0.1 Hz10 Hz 2 2 V p-p Gain = 100 f = 0.1 Hz10 Hz 2 2 V p-p Gain = 10 f = 1 kHz 0.25 0.25 V/ Hz Gain = 100 f = 1 kHz 0.25 0.25 V/ Hz DYNAMIC RESPONSE 3 dB Bandwidth V = +1 V dc 100 100 kHz OUT Slew Rate, T to T Gain = 10 0.17 0.22 0.17 0.22 V/s MIN MAX Gain = 100 0.1 0.17 0.1 0.17 V/s Settling Time to 0.01%, 1 V Step 24 22 s POWER SUPPLY Operating Range T = T to T 2.4 5 12 2.4 5 10 V A MIN MAX Quiescent Current Gain = 10 0.16 0.20 0.16 0.20 mA Gain = 100 0.23 0.29 0.23 0.29 mA TRANSISTOR COUNT Number of Transistors 46 46 *At temperatures above 25C, CMV degrades at the rate of 12 mV/C i.e., 25C CMV = 2 V, 85C CMV = 1.28 V. Speci cations subject to change without notice. 2 REV. D