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Amp protects circuit connection from overvoltage

Posted: 28 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:amplifier? ADC? automotive?

National Semiconductor Corp. has released a wideband 900MHz fully differential amplifier that has a programmable output limiting clamp to safeguard ADCs and other downstream circuitry from overvoltage occurrences.

The company said the amplifier's compact clamp delivers improved distortion, higher bandwidth and clamping accuracy compared with existing amplifiers that use external discrete clamping circuits to have the same protection.

The LMH6553 works well over the -40C to 125C temperature range and is well-suited for processing wide dynamic-range signals in automotive safety applications, along with collision avoidance, lane departure and back-up warning systems. As part of National's PowerWise family of energy-efficient products, the LMH6553 has 900MHz unity-gain bandwidth while operating on 29mA of supply current. This leads to power-to-performance ratio of 32?A/MHz.

The amplifier fits a wide supply range from single 4.5V up to a split 6V supply. It provides 4kV of ESD protection and its adjustable output clamp has a single reference control that sets internal high and low clamp levels against the multiple reference control levels needed with external discrete clamps. At the sane time, the LMH6553 has a 600ps clamp overdrive recovery time and guaranteed 53mV clamp accuracy, providing clamp levels to be accurately set based on the desired signal.

- Ismini Scouras

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