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Demonstration circuit 2900A is a 16-channel analog LiDAR receiver chain. The LTC6561 is featured; which has 74kΩ transimpedance gain and 30µA linear input current range. Utilizing the LTC6561’s output MUX, four devices are combined to a single output. The LTC6561’s fast overload recovery makes it well suited for LIDAR receivers. The LTC6561 operates from 5V single supply. The LTC6561’s single-ended output can swing 2VP-P on a 100Ω load.
On the DC2900A, the FirstSensor’s 16-channel 400nm to 1100nm wavelength sensitive APD array sensor feeds four LTC6561s for current to voltage conversion and amplification. The APDs are DC coupled to the TIAs inputs to facilitate fast channel switching and output multiplexing. The DC2900A AC-coupled output is intended to demonstrate time domain measurements into 50Ω systems.