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Demonstration circuit 2808A features the LTC6561 four-channel transimpedance amplifier (TIA) with output multiplexing. The DC2808A accepts voltage pulses and converts them to current for the TIA. The board can also be used to measure bandwidth and channel isolation with a network analyzer. The LTC6561, which features 74KΩ transimpedance gain and 30uA linear input current range, is ideal for LIDAR receivers using Avalanche Photodiodes (APD). The LTC6561 operates from 5V single supply and consumes only 220mW. Utilizing the LTC6561’s output MUX, multiple LTC6561 devices can combine into a single output. The LTC6561’s fast overload recovery makes it well suited for LIDAR receivers. The LTC6561’s single-ended output can swing 2VP-P into a 100Ω load.
The LTC6561 is packaged in a compact 4mm × 4mm 24-pin leadless QFN package with an exposed pad for thermal management and low inductance.