AD620BR-REEL7

AD620BR-REEL7 FEATURES

Easy to useGain set with one external resistor(Gain range 1 to 10,000)Wide power supply range (±2.3 V to ±18 V)Higher performance than 3 op amp IA designsAvailable in 8-lead DIP and SOIC packagingLow power, 1.3 mA max supply currentExcellent dc performance (B grade)50 μV max, input offset voltage0.6 μV/°C max, input offset drift1.0 nA max, input bias current100 dB min common-mode rejection ratio (G = 10)Low noise9 nV/√Hz @ 1 kHz, input voltage noise0.28 μV p-p noise (0.1 Hz to 10 Hz)Excellent ac specifications120 kHz bandwidth (G = 100)15 μs settling time to 0.01%

AD620BR-REEL7 PRODUCT DESCRIPTION

The AD620 is a low cost, high accuracy instrumentationamplifier that requires only one external resistor to set gains of1 to 10,000. Furthermore, the AD620 features 8-lead SOIC andDIP packaging that is smaller than discrete designs and offerslower power (only 1.3 mA max supply current), making it agood fit for battery-powered, portable (or remote) applications.The AD620, with its high accuracy of 40 ppm maximumnonlinearity, low offset voltage of 50 μV max, and offset drift of0.6 μV/°C max, is ideal for use in precision data acquisitionsystems, such as weigh scales and transducer interfaces.Furthermore, the low noise, low input bias current, and low powerof the AD620 make it well suited for medical applications, suchas ECG and noninvasive blood pressure monitors.The low input bias current of 1.0 nA max is made possible withthe use of Superϐeta processing in the input stage. The AD620works well as a preamplifier due to its low input voltage noise of9 nV/√Hz at 1 kHz, 0.28 μV p-p in the 0.1 Hz to 10 Hz band,and 0.1 pA/√Hz input current noise. Also, the AD620 is wellsuited for multiplexed applications with its settling time of 15 μsto 0.01%, and its cost is low enough to enable designs with onein-amp per channel.Table 1. Next Generation Upgrades for AD620PartCommentAD8221Better specs at lower priceAD8222Dual channel or differential outAD8226Low power, wide input rangeAD8220JFET inputAD8228Best gain accuracyAD8295+2 precision op amps or differential outAD8429Ultra low noise0510152030,0005,00010,00015,00020,00025,0000TOTAL ERROR, PPM OF FULL SCALESUPPLY CURRENT (mA)AD620ARG3 OP AMPIN-AMP(3 OP-07s)00775-0-002Figure 2. Three Op Amp IA Designs vs. AD620

AD620BR-REEL7 APPLICATIONS

Weigh scalesECG and medical instrumentationTransducer interfaceData acquisition systemsIndustrial process controlsBattery-powered and portable equipment