Transimpedance amplifier ideal for LiDAR receivers using APDs

Analog Devices Inc. LTC6561 four-channel TIA provides a 220MHz -3dB Bandwidth with 2pF Input Capacitance. The TIA's low noise, high transimpedance, and low power dissipation are perfect for LiDAR receivers using APDs. The device is intended to recover from APD current surges in 12ns at 1mA, and it can manage up to 1A of APD current surge, maximising the effectiveness of the LiDAR system. The four-channel system is created with two levels of multiplexing. Four inputs are multiplexed into a single output. A second output MUX enables multiple devices to be combined to address eight-channel, 12-channel, 16-channel, or 32-channel applications. This creates smaller overall solutions and higher channel count in space-restricted situations. Also, it removes the necessity for external multiplexers further decreasing cost and size. The device works from a 5V supply and draws only 180mW of power for the four channels. The device is provided in a compact 4mm x 4mm 24-pin leadless QFN package, with an exposed pad for thermal management and low inductance.