I'm trying to design a LIDAR receiver that will digitize the amplitude of returned light from a photodetector every 100 nanoseconds.
This circuit needs to store the digitized value in a buffer (on-chip if possible) very rapidly and then automatically take another reading within the next 100 ns. window. Total number of readings will not exceed 50 so the buffer could be small. Then the controlling processor (probably a Teensy 4.0 @ 600 MHz.) will read and clear the buffer and store the values for processing later. The problem is the internal A/D on the Teensy is only good for 1 MSPS.
My question is does anyone know of a fast A/D that can internally store readings? Resolution should be 8 to 12 bits and speed about 20 million samples per second or better. If there is no such A/D maybe there is a better way to achieve the same result. Or does anyone have a link for an A/D evaluation website? I could just start visiting many manufacturers websites to see if they even make fast A/Ds with buffers but I thought I would ask here first in case someone was familiar with them. It would be nice if the A/D was available in a DIP package so I could use it in a breadboard. Thanks!
This circuit needs to store the digitized value in a buffer (on-chip if possible) very rapidly and then automatically take another reading within the next 100 ns. window. Total number of readings will not exceed 50 so the buffer could be small. Then the controlling processor (probably a Teensy 4.0 @ 600 MHz.) will read and clear the buffer and store the values for processing later. The problem is the internal A/D on the Teensy is only good for 1 MSPS.
My question is does anyone know of a fast A/D that can internally store readings? Resolution should be 8 to 12 bits and speed about 20 million samples per second or better. If there is no such A/D maybe there is a better way to achieve the same result. Or does anyone have a link for an A/D evaluation website? I could just start visiting many manufacturers websites to see if they even make fast A/Ds with buffers but I thought I would ask here first in case someone was familiar with them. It would be nice if the A/D was available in a DIP package so I could use it in a breadboard. Thanks!
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