Dual, ultra-low noise, low-gate-current audio N-channel JFET

The JFE2140 is a Burr-Brown™ Audio, matched-pair discrete JFET built using Texas

Instruments’ modern, high-performance, analog bipolar process. The JFE2140 features

performance not previously available in older discrete JFET technologies. The

JFE2140 offers excellent noise performance across all current ranges, where the

quiescent current can be set by the user from 50 µA to 20 mA. When biased at 5 mA,

the device yields 0.9 nV/√ Hz of input-referred noise, giving

ultra-low noise performance with extremely high input impedance (> 1 TΩ). In

addition, the matching between JFETs is tested to ±4 mV, providing low offset and

high CMRR performance for differential pair configurations. The JFE2140 also

features integrated diodes connected to separate clamp nodes to provide protection

without the addition of high leakage, nonlinear external diodes.

The JFE2140 can withstand a high drain-to-source

voltage of 40‑V, as well as gate-to-source and gate-to-drain voltages down to –40 V.

The temperature range is specified from –40°C to +125°C.