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Preamplifier receives nanoamp signals to minimize cost in laser-based distance-measurement systems

Maxim Integrated Products has introduced a high-sensitivity, high-dynamic-range TIA (transimpedance amplifier) for laser-based distance-measurement applications such as automotive active cruise control, industrial safety curtains, and consumer/construction range finders.

The MAX3806 can receive an input signal as low as 42 nAp-p and amplify it to the range required by low-cost differential ADCs, while handling overload signals of up to 2 mAp-p. A pin-selectable gain setting of 30 kilohms or 60 kilohms allows the MAX3806 to achieve typical bandwidths of 98 MHz and 49 MHz, respectively, for a variety of applications using the same device.

An on-chip attenuator can quickly reduce the gain by 14 dB to help suppress unwanted signals. These integrated functions eliminate the need for multiple TIAs and analog switching multiplexers, thus saving board space and cost. The device's high dynamic range (42 nAp-p to 40 microamps p-p) enables designers to use the same front-end receiver circuit for multiple applications.

Availability and Pricing

The MAX3806 operates from a single 5.0 V supply, and is specified over the -40 to +105 degrees Celsius AEC-Q100 Level 2 temperature range. The device is available in a lead-free, 12-pin TQFN package. Prices start at $2.35 (1000-up, FOB USA). An evaluation kit is available to speed designs.

Datasheet:

MAX3806

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