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76V, APD, Bias Output Stage with Current Monitoring

DS1842 Combines with DS1843 to Improve Integration and Lower Cost in APD Biasing

Product Details

The DS1842 integrates the discrete high-voltage components necessary for avalanche photodiode (APD) bias and monitor applications. A switch FET is 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 device also includes a dual current mirror to monitor the APD current.

Key Features

  • 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
  • Multiple External Filtering Options
  • 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad

Applications/Uses

  • APD Biasing
  • GPON Optical Network Unit and Optical Line Transmission
Parametric specs for Fiber Photodiode Current Monitors
Photo Diode Appl. APD
IDIODE (min) 10µA
IDIODE (max) 4mA
VBIAS (V) (max) 76
Package/Pins TDFN/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.20 @1k
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Simplified Block Diagram

DS1842: Typical Application Circuit DS1842: Typical Application Circuit Zoom icon

Technical Docs

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Parameters

Parametric specs for Fiber Photodiode Current Monitors
Photo Diode Appl. APD
IDIODE (min) 10µA
IDIODE (max) 4mA
VBIAS (V) (max) 76
Package/Pins TDFN/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.20 @1k

Key Features

  • 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
  • Multiple External Filtering Options
  • 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad

Applications/Uses

  • APD Biasing
  • GPON Optical Network Unit and Optical Line Transmission

Description

The DS1842 integrates the discrete high-voltage components necessary for avalanche photodiode (APD) bias and monitor applications. A switch FET is 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 device also includes a dual current mirror to monitor the APD current.

Simplified Block Diagram

DS1842: Typical Application Circuit DS1842: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal