MAX3806 Series

MAX3806 Series

Maxim's MAX3806 is a high-gain linear preamplifier for distance measurement applications using a laser beam. The device operates from a single +5.0 V supply and converts current from an AC-coupled photodiode into a single-ended voltage signal. The input accepts single pulses or bursts of pulses with widths down to 30 ns. The amplifier remains linear with input amplitudes from 42 nAP (SNR = 3) to 40 µAP. It can also withstand overload signals as large as 2 mAP. The output stage is designed to drive a high-impedance load to deliver the output-voltage swing at the lowest possible power dissipation. The gain of the preamplifier stage is selected using the GAIN pin at either 60 kΩ or 30 kΩ. There is also an internal 14 dB attenuator that is selected using the ATT pin and the output stage can be disabled (high impedance). The device is available in a 3 mm x 3 mm, 12-pin TQFN package and operates over the -40°C to +105°C temperature range.

  • +5 V supply voltage
  • Linearity range up to 40 µAP
  • Overload current up to 2 mAP
  • 50 mW power dissipation at +5.0 V
  • 1.5 pA√Hz noise density at 60 kΩ gain
  • 14 nARMS Input-referred noise at 60 kΩ gain
  • Selectable gains (60 kΩ, 30 kΩ)
  • Selectable 14 dB attenuation
  • Laser sensors for industrial applications
  • Laser sensors for portable distance measurement
  • LIDAR sensors for automotive applications (ACC, stop and go)

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