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Amplifier integrates programmable output limiting clamp

Santa Clara, Calif.—National Semiconductor Corp. has developed a wideband 900 MHz fully differential amplifier that includes a programmable output limiting clamp for protecting A/D converters and other downstream circuitry from over-voltage events.

The amplifier's integrated clamp provides improved distortion, higher bandwidth and clamping accuracy compared with existing amplifiers that must use external discrete clamping circuits to provide the same protection, according to National.

The LMH6553 operates over the -40°C to 125°C temperature range and is well-suited for processing wide dynamic-range signals in automotive safety applications, including collision avoidance, lane departure and back-up warning systems. A member of National's PowerWise family of energy-efficient products, the LMH6553 features 900 MHz unity-gain bandwidth while operating on 29 mA of supply current. This results in a power-to-performance ratio of 32 µA per MHz.

The LMH6553 operates across a wide supply range from single 4.5V up to a split ±6V supply. The LMH6553 provides 4 kV of electrostatic discharge (ESD) protection and its adjustable output clamp has a single reference control that sets the internal high and low clamp levels versus the multiple reference control levels required with external discrete clamps. Additionally, the LMH6553 features a 600 ps clamp overdrive recovery time and guaranteed ±53 mV clamp accuracy, allowing clamp levels to be accurately set relative to the desired signal.

Pricing: $3.35 each in 1,000-unit quantities.
Availability: The device is available now in both 8-pin PSOP and 8-pin LLP' packages.
Datasheet: Click here.

National Semiconductor, www.national.com

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