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DS1842A
76V, APD, Bias Output Stage with Current Monitoring

APD Bias Output Stage and Fast Current Monitor on a Single Chip


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 144kB)
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The DS1842A integrates the discrete high-voltage components necessary for avalanche photodiode (APD) bias and monitor applications. A switch FET and precision voltage-divider network are used in conjunction with an external DC-DC controller to create a boost DC-DC converter. A current clamp limits current through the APD and also features an external shutdown. The precision voltage-divider network is provided for precise control of the APD bias voltage. The device also includes a dual current mirror to monitor the APD current.

Key Features   Applications/Uses
  • 76V Maximum Boost Voltage
  • Switch FET
  • Current Monitor with a Wide 1µA to 2mA Range, Fast 50ns Time Constant, and 10:1 and 5:1 Ratio
  • 2mA Current Clamp with External Shutdown
  • Precision Voltage Feedback
  • Multiple External Filtering Options
  • 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad

 
  • APD Biasing
  • GPON ONU and OLT

Diagram
DS1842A: Typical Application Circuit
Typical Application Circuit

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    Document Ref.: 19-4994; 2009-10-15
    This page last modified: 2009-10-15


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