The AD8666ARZ from Analog Devices is a dual 16V precision JFET-input operational amplifier with 4 MHz gain-bandwidth product, very low 1 pA input bias current, and rail-to-rail output. Operating from 5V to 16V single supply (\u00b12.5V to \u00b18V dual supply), it provides precision performance for high-impedance sensor interfaces and low-frequency signal conditioning in an SOIC-8 package.<\/p>\n
Product Overview The AD8666ARZ from Analog Devices is a dual 16V precision JFET-input operational amplifier with 4 MHz gain-bandwidth product, very low 1 pA input bias current, and rail-to-rail output. Operating from 5V to 16V single supply (\u00b12.5V to \u00b18V dual supply), it provides precision performance for high-impedance sensor interfaces and low-frequency signal conditioning in […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[165],"class_list":["post-6520","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"Dual JFET-input precision op-amp, 4MHz GBW, 1pA Ibias, 100\u00b5V Vos, 5-16V, RR output, SOIC-8","date_code":"","package_case":"SOIC-8 (Narrow, 3.90mm width)","in_stock":5800,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/AD8666.pdf","price":"$2.16","product_introduction":"The AD8666ARZ from Analog Devices is a dual precision JFET-input operational amplifier that combines extremely low input bias current (1 pA typical) with low offset voltage (100 \u00b5V typical) and rail-to-rail output capability. The JFET input stage makes it ideal for interfacing with high-impedance sources such as photodiodes, pH electrodes, and piezoelectric sensors where the picoampere bias current prevents loading of the source. The 4 MHz gain-bandwidth product and 2.8 V\/\u00b5s slew rate are well-suited for precision low-frequency signal conditioning. The wide 5V to 16V supply range accommodates both single-supply and dual-supply applications. The ARZ suffix indicates SOIC-8 packaging rated for the extended -40\u00b0C to 125\u00b0C temperature range.","working_principle":"The AD8666ARZ uses a JFET-input differential pair followed by a folded-cascode gain stage and a rail-to-rail Class-AB output stage. The JFET input pair provides the extremely low 1 pA gate leakage current characteristic of junction field-effect transistors, which is orders of magnitude lower than bipolar input bias currents. The input offset voltage is trimmed during manufacturing using Analog Devices' DigiTrim technology, achieving 100 \u00b5V typical. The rail-to-rail output stage uses complementary NPN and PNP transistors in a common-emitter configuration, allowing the output to swing to within approximately 1.5V of each supply rail under 10k\u03a9 load. The 4 MHz gain-bandwidth product is set by the internal compensation capacitor, providing unity-gain stability without external components. The high 95 dB CMRR and 97 dB PSRR ensure precision performance in the presence of common-mode and supply noise.","pin_description":"
| Pin<\/th> | Name<\/th> | Function<\/th><\/tr> | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | OUT A<\/td> | Amplifier A output<\/td><\/tr> | ||||||||||||
| 2<\/td> | -IN A<\/td> | Amplifier A inverting input<\/td><\/tr> | ||||||||||||
| 3<\/td> | +IN A<\/td> | Amplifier A non-inverting input<\/td><\/tr> | ||||||||||||
| 4<\/td> | V-<\/td> | Negative supply<\/td><\/tr> | ||||||||||||
| 5<\/td> | +IN B<\/td> | Amplifier B non-inverting input<\/td><\/tr> | ||||||||||||
| 6<\/td> | -IN B<\/td> | Amplifier B inverting input<\/td><\/tr> | ||||||||||||
| 7<\/td> | OUT B<\/td> | Amplifier B output<\/td><\/tr> | ||||||||||||
| 8<\/td> | V+<\/td> | Positive supply (5-16V)<\/td><\/tr><\/table>","application_scenarios":"The AD8666ARZ excels in photodiode transimpedance amplifier applications where the 1 pA bias current minimizes DC offset errors even with very high feedback resistor values (up to 100 M\u03a9). In medical ECG\/EEG front-ends, the picoampere input current prevents polarization of the skin-contact electrodes. For electrometer and pH meter applications, the 100 \u00b5V offset voltage and 95 dB CMRR enable accurate measurement of millivolt-level signals from high-impedance sources. The 16V supply capability supports \u00b18V split supplies for applications requiring wide output swing around ground.","alternative_models":"
|