Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: OPA698 and OPA699
Edited by the Electronicstalk Editorial Team on 12 November 2003
Speedy recovery for
voltage limiting amplifiers
A novel pair of wideband voltage limiting amplifiers provide accurate high-speed voltage limiting to protect sensitive signal conversion devices, such as high-speed A/D convertors
The devices feature exceptional amplifier capability with externally controlled output stage voltage limiting. 'The OPA698 and OPA699 provide designers a very flexible pair of amplifiers with the added feature of fast recovery from easily controlled output limiting voltages. Particularly useful in systems with high input overdrives and/or a varying gain element, these amplifiers set a hard limit to output voltage excursion protecting subsequent channel elements from damage', said Michael Steffes, Strategic Marketing Manager for TI's High-Speed Signal Processing Group.
This article was originally published on Electronicstalk on 12 November 2003 at 8.00am (UK)
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Both the low-gain-stable OPA698 and high-gain-bandwidth OPA699 include internally set default levels to the bipolar limiting function.
Dropping these amplifiers into existing standard pinout designs will give a 1ns recovery from output overdrive at these default levels with no external connection to the limiter set pins.
This allows an easy upgrade to existing designs suffering from the long overdrive recovery times seen in typical amplifier stages.
Externally applied limiting voltages override this internal default.
Low offset errors in the limiter pin path (under +/-10mV) and extremely sharp transition from linear to limited operation, allow these limiter voltages to be set within 100mV of the desired linear output swing with no degradation in harmonic distortion or pulse response settling.
Having virtually no overshoot going in and out of limiting, and a 1ns recovery time, ensures that output overdrives will be effectively blocked from the signal path.
The OPA698 features unity-gain stability, 250MHz gain bandwidth product and 1100V/us slew rate; the OPA699 features high-gain stability (gain of 4 or more), 1GHz gain bandwidth product and 1400V/us slew rate.
Both devices offer +/-120mA output current, +/-15.5mA quiescent current, +/-4V output swing, and dual (+/-5V) or single (+5 to +12V) supplies.
The OPA698 and OPA699 are housed in industry-standard pinout SO-8 packages, and are available now from TI and its authorised distributors.
The OPA698 is priced from $1.89 and the OPA699 is priced from $1.95 in 1000-piece quantities (suggested resale pricing).
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