Four-Channel Transimpedance Amplifier with Output Multiplexing

The LTC6563 is a low-noise four-channel transimpedance amplifier (TIA) with 600MHz bandwidth. The LTC6563 TIA’s low noise, wide linear range, and low power dissipation are ideal for LIDAR receivers using Avalanche photodiodes (APDs) and photodiodes (PDs). The amplifier features selectable 22.2/16.7/11.1/5.55kΩ Transimpedance gain (RT) and 90μA linear input current range. Using an APD with a total input capacitance of 0.5pF, the input current noise density is 1.8pA/√Hz at 100MHz and 3.7pA/√Hz at 600MHz. The LTC6563 consumes between 194mW and 325mW on a 3.3V supply depending on output mode. An internal 4-to-1 MUX simplifies the system design. In addition, external multiplexing capability allows channel expansion up to 64 channels, saving space and power. Fast overload recovery and fast channel switchover make the LTC6563 well suited for LIDAR receivers with multiple APDs. The built-in high-speed differential ADC driver can swing as much as 2VP-P while driving into 100Ω external differential load.

The LTC6563 is packaged in a 3mm × 5mm 24-pin exposed pad QFN package with wettable flanks.

APPLICATIONS

* Automotive LIDAR Receiver

* Industrial LIDAR Receiver

* 600MHz –3dB Bandwidth with 0.5pF Input Capacitance

* Differential Output with Up to 2VP-P Swing into 100Ω Differential Load

* Built-In High-Speed ADC Driver with Output MUX

* Selectable 22.2/16.7/11.1/5.55kΩ Transimpedance Gain

* 1.8pA/3.7pA√Hz Input Current Noise Density 100MHz/600MHz (0.5pF)

* 65nARMS Integrated Input-Referred Current Noise Over 600MHz (0.5pF)