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JFET-input amps deliver up to 2675V/?s slew rate

Posted: 16 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:JFET input amplifier? operational amplifier? signal integrity?

OPA653, OPA659 JFET-input amp

Texas Instruments Inc. claims the fastest JFET-input operational amplifiers that provide a slew rate of up to 2675V/?s, 3x times faster than the nearest competitor, resulting in improved pulse response. The OPA653 and OPA659 amplifiers combine a wideband voltage feedback amplifier with a high-impedance JFET-input stage and meet the requirements for frequency domain and FFT analysis due to their large signal bandwidth and low total harmonic distortion.

The fast slew rate and low distortion of the OPA653 and OPA659 contribute to enhanced signal integrity for time-domain and pulse-oriented applications. The OPA653 is a fixed gain (+2 V/V) JFET-input amplifier with a slew rate of 2675V/?s and 475MHz of large signal bandwidth (2Vp-p). Meanwhile, the OPA659 is a unity gain stable JFET-input amplifier with a slew rate of 2550V/?s and 575MHz of large signal bandwidth (2Vp-p).

In addition, the amplifiers pack third order harmonic distortion (HD3) of -60dBc (OPA659) and -66dBc (OPA653) at 100MHz that ensure high-bandwidth linearity. Fast settling time (8ns) and overdrive recovery (8ns) also enable excellent pulse response.

The OPA653's ultralow overshoot and ringing are desirable in low-noise, wideband, high input impedance applications such as DAQ cards, high-impedance probes and oscilloscope front ends.

The OPA659's 350MHz high gain bandwidth optimizes machine vision applications, such as broadband photodiode transimpedance amplifiers used in wafer inspection equipment. Power supply voltage range of 3.5 V to 6.4V maximizes design flexibility.

These devices drive TI's 12- and 14bit, 400MSps and 500MSps ADC converters including the ADS5474, ADS5463 and ADS54RF63.

The OPA653 and OPA659 devices are both available in VSON-8 or SOT23-5 packages and priced at $2.95 in 1,000-piece quantities.





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