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The LTC6561IUF is a low-noise, four-channel, transimpedance amplifier (TIA) with a 220MHz bandwidth.The LTC6561IUF multichannel transimpedance amplifier features low noise, high impedance, and low power consumption, making it suitable for LIDAR receivers using avalanche photodiodes (APDs). The amplifier has a transimpedance gain of 74kΩ and a linear input current range of 30µA. The input current noise density at 200MHz is 4.5pA/√Hz using an APD input circuit with a total capacitance of 2pF. Noise and bandwidth are further improved with lower capacitance. The device requires only a single 5V supply and consumes only 220 mW. Multiple 4-channel LTC6561IUF devices can be combined to directly interface with 12-, 16-, and 32-channel APD arrays using the internal 4-to-1 multiplexer and the LTC6561IUF's output multiplexer.

The fast overload recovery and fast channel switching characteristics of the LTC6561IUF make it suitable for LIDAR receivers with multiple APDs. Its single-ended outputs can swing 2VP-P under 100Ω loads, while its low-impedance op-amp-type outputs can drive 50Ω cables terminated to the rear.

The LTC6561IUF is housed in a compact 4mm x 4mm 24-pin leadless QFN package with bare pads for thermal management and low inductance.

Features - LTC6561IUF

220MHz -3dB bandwidth (with 2pF input capacitance)

Single-Ended Output

74kΩ Transimpedance Gain

Input Current Noise Density of 4.5pA/√Hz at 200MHz (2pF)

Integral input current noise of 56nARMS at 200MHz (2pF) and above

Linear Input Range 0µA to 30µA

Overload Current > ±400mA (peak)

Fast overload recovery 12ns, 1mA

Fast channel switching < 50ns

5V single supply

220mW power consumption for 4 channels

2VP-P output swing with 100Ω load

4mm × 4mm 24-pin QFN package

Output Multiplexer (MUX) Combines Multiple 4-Channel Devices to Create 4-, 8-, 12-, 16-, 24-, 32-Channel Solutions

Applications - LTC6561IUF

LIDAR Receiver

Industrial imaging

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