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Three Op Amp IA Designs vs. AD620 REV. E 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. CONNECTION DIAGRAM 8-Lead Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages 1000. Furthermore, the AD620 features 8-lead SOIC and DIP packaging that is smaller than discrete designs, and offers lower power (only 1.3 mA max supply current), making it a good fit for battery powered, portable (or remote) applications. The AD620, with its high accuracy of 40 ppm maximum nonlinearity, low offset voltage of 50 |mV max and offset drift of 0.6 mV/°C max, is ideal for use in precision data acquisition systems, such as weigh scales and transducer interfaces. Furthermore, the low noise, low input bias current, and low power of the AD620 make it well suited for medical applications such as ECG and noninvasive blood pressure monitors. The low input bias current of 1.0 nA max is made possible with the use of SuperPeta processing in the input stage. The AD620 works well as a preamplifier due to its low input voltage noise of 9 nV/VHz at 1 kHz, 0.28 |mV p-p in the 0.1 Hz to 10 Hz band, 0.1 pA/VHz input current noise. Also, the AD620 is well suited for multiplexed applications with its settling time of 15 ms to 0.01% and its cost is low enough to enable designs with one inamp per channel. SOURCE RESISTANCE - a Figure 2. Total Voltage Noise vs. Source Resistance One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: Fax: 781/326-8703 © Analog Devices, Inc., 1999 AD620-SPECIFICATI0NS (Typical @ +25°C, VS = ±15 V, and RL = 2 kQ, unless otherwise noted) AD620A AD620B AD620S1 Model Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN G = 1 + (49.4 k/RG) Gain Range 1 10,000 1 10,000 1 10,000 Gain Error2 V out = ± 10 V G = 1 0.03 0.10 0.01 0.02 0.03 0.10 % G = 10 0.15 0.30 0.10 0.15 0.15 0.30 % G = 100 0.15 0.30 0.10 0.15 0.15 0.30 % G = 1000 0.40 0.70 0.35 0.50 0.40 0.70 % Nonlinearity, Vout = -10 V to +10 V, G = 1-1000 Rl = 10 kW 10 40 10 40 10 40 ppm G = 1-100 Rl = 2 kW 10 95 10 95 10 95 ppm Gain vs. Temperature A || •! G Ga 10 -50 10 -50 10 -50 u u % 1 pp pp VOLTAGE OFFSET (Total RTI Error = VOSI + VOSO/G) Input Offset, Vosi Vs = ± 5 V to ± 15 V 30 125 15 50 30 125 mV Over Temperature Vs = ± 5 V to ± 15 V 185 85 225 mV Average TC VS = ±5 V to ±15 V 0.3 1.0 0.1 0.6 0.3 1.0 mV/°C Output Offset, VOSO VS = ±15 V VS = ±5 V 400 1000 1500 200 500 750 400 1000 1500 mV mV Over Temperature VS = ±5 V to ±15 V 2000 1000 2000 mV Average TC VS = ±5 V to ±15 V 5.0 15 2.5 7.0 5.0 15 mV/°C Offset Referred to the Input vs. Supply (PSR) Vs = ± 2.3 V to ± 18 V G = 1 80 100 80 100 80 100 dB G = 10 95 120 100 120 95 120 dB G = 100 110 140 120 140 110 140 dB G = 1000 110 140 120 140 110 140 dB INPUT CURRENT Input Bias Current 0.5 2.0 0.5 1.0 0.5 2 nA Over Temperature 2.5 1.5 4 nA Average TC 3.0 3.0 8.0 pA/°C Input Offset Current 0.3 1.0 0.3 0.5 0.3 1.0 nA Over Temperature 1.5 0.75 2.0 nA Average TC 1.5 1.5 8.0 pA/°C INPUT Input Impedance Differential 10||2 10||2 10||2 GW||pF Common-Mode 10||2 10||2 10||2 GW||pF Input Voltage Range3 VS = ±2.3 V to ±5 V -VS + 1.9 +VS - 1.2 -VS + 1.9 +VS - 1.2 -VS + 1.9 +Vs - 1.2 V Over Temperature -VS + 2.1 +VS - 1.3 -VS + 2.1 +VS - 1.3 -VS + 2.1 +Vs - 1.3 V VS = ±5 V to ±18 V -VS + 1.9 +VS - 1.4 -VS + 1.9 +VS - 1.4 -VS + 1.9 +Vs - 1.4 V Over Temperature -VS + 2.1 +VS - 1.4 -VS + 2.1 +VS - 1.4 -Vs + 2.3 +Vs - 1.4 V Common-Mode Rejection Ratio DC to 60 Hz with I kW Source Imbalance VCM = 0 V to ±10 V G = 1 73 90 80 90 73 90 dB G = 10 93 110 100 110 93 110 dB G = 100 110 130 120 130 110 130 dB G = 1000 110 130 120 130 110 130 dB OUTPUT Output Swing RL = 10 kW, VS = ±2.3 V to ±5 V -VS + 1.1 +VS - 1.2 -VS + 1.1 +VS - 1.2 -VS + 1.1 +Vs - 1.2 V Over Temperature -VS + 1.4 +VS - 1.3 -VS + 1.4 +VS - 1.3 -VS + 1.6 +Vs - 1.3 V VS = ±5 V to ±18 V -VS + 1.2 +VS - 1.4 -VS + 1.2 +VS - 1.4 -VS + 1.2 +Vs - 1.4 V Over Temperature -VS + 1.6 +VS - 1.5 -VS + 1.6 +VS - 1.5 -Vs + 2.3 +Vs - 1.5 V Short Current Circuit ±18 ±18 ±18 mA -2- REV. E AD620 Model Conditions AD620A Min Typ Max AD620B Min Typ Max AD620S1 Min Typ Max Units DYNAMIC RESPONSE Small Signal -3 dB ...
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