Analog Devices has introduced a JFET (Junction Field Effect Transistor) operational amplifier for optical networking, wireless basestations, medical CT scanners and automatic test equipment applications. The AD8610 is claimed to have the lowest offset and highest accuracy of any JFET amplifier on the market, with only 100 µV maximum offset voltage and noise of only 6 nVSQRT Hz.
The AD8620, a dual version of the AD8610 with slightly adjusted specifications, is currently in development.
In addition to ultra low offset voltage and drift, the AD8610 features very low input voltage and current noise, as well as very low input bias current and wide bandwidth. In the device, input bias current is maximum 10 pA, and outputs settle to 0.01% accuracy in less than 600 nsec.
In the AD8610, outputs slew at 50 V/µs in either inverting or non-inverting gain configurations, and output swings to within 1.2 V of supplies even with a 1 kohm load, maximising dynamic range with limited supply voltages.
Unlike many JFET amplifiers, the AD8610 input bias current is low over the entire operating temperature range. Low voltage and low current noise achieve maximum signal resolution regardless of source impedance; low voltage combined with low drift means that the system has high dc accuracy, with no trimming or system level auto-zeroing required.
The AD8610 is available in a Miniature Small Outline Package (MSOP) for high board and system density, in addition to industry-standard Small-Outline Integrated Circuit (SOIC) packaging.