JAJSQ75 april 2023 DAC53204-Q1 , DAC63204-Q1
PRODUCTION DATA
The gain and sensitivity of an avalanche photodiode (APD) changes with temperature, so the bias voltage must be variable to achieve a constant sensitivity. The DACx3204‑Q1 can be used to control a DC/DC converter to provide the variable bias voltage. The DACx3204‑Q1 outputs are Hi-Z when the device is powered off, and the outputs are in Hi-Z power-down mode by default when the device is powered on. This configuration means the APD bias voltage is set to the nominal value of the DC/DC converter until the DACx3204‑Q1 output is powered on. Figure 8-1 shows the APD control circuit. Typical applications of APD biasing are LIDAR and fiber optic communication systems.