MAX1932

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Digitally Controlled, 0.5% Accurate, Safest APD Bias Supply

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • Unique Architecture Delivers Excellent Accuracy for Improved System Performance
    • 0.5% Accurate Output
    • Low Ripple Output (< 1mV)
  • Protection Features Guarantee Safe Operation
    • Accurate High-Side Current Limit
    • Avalanche Indicator Flag
  • Output-Voltage Flexibility Facilitates Multiple Applications and Design Approaches
    • 4.5V to 90V Output
    • Set Output Voltage via 8-Bit SPI-Compatible Internal DAC, External DAC, or External Resistors
  • Small Circuit Footprint Reduces Equipment Size
    • 12-Pin, 4mm x 4mm Thin QFN Package
    • Circuit Height < 2mm
  • Commonly Available 2.7V to 5.5V Input Voltage Range

The MAX1932 generates a low-noise, high-voltage output to bias avalanche photodiodes (APDs) in optical receivers. Very low output ripple and noise is achieved by a constant-frequency, pulse-width modulated (PWM) boost topology combined with a unique architecture that maintains regulation with an optional RC or LC post filter inside its feedback loop. A precision reference and error amplifier maintain 0.5% output voltage accuracy.

The MAX1932 protects expensive APDs against adverse operating conditions while providing optimal bias. Traditional boost converters measure switch current for protection, whereas the MAX1932 integrates accurate high-side current limiting to protect APDs under avalanche conditions. A current-limit flag allows easy calibration of the APD operating point by indicating the precise point of avalanche breakdown. The MAX1932 control scheme prevents output overshoot and undershoot to provide safe APD operation without data loss.

The output voltage can be accurately set with either external resistors, an internal 8-bit DAC, an external DAC, or other voltage source. Output span and offset are independently settable with external resistors. This optimizes the utilization of DAC resolution for applications that may require limited output voltage range, such as 4.5V to 15V, 4.5V to 45V, 20V to 60V, or 40V to 90V.

Applications

  • Fiber Optic Network Equipment
  • Laser Range Finders
  • Optical Receivers and Modules
  • PIN Diode Bias Supply
  • Telecom Equipment
MAX1932
Digitally Controlled, 0.5% Accurate, Safest APD Bias Supply
MAX1932: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2

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Tools & Simulations

Software Development 1

Evaluation Kits

MAX1932EVKIT

MAX1932 Evaluation Kit

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Features and Benefits

  • 4.5V to 5.5V Input Range
  • Output Voltage Ranges from 40V to 90V
  • Output Ranges are Adjustable with Resistors
  • Overcurrent Protection
  • SPI-Compatible Serial Interface
  • Menu-Driven Software
  • Windows 95/98/2000-Compatible Software
  • Reconfigurable for Input Voltages Down to 3V (Refer to the MAX1932 IC Data Sheet)
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX1932 evaluation kit (EV kit) is a fully assembled and tested surface-mount printed circuit board (PCB). The EV kit contains a MAX1932 step-up switching regulator that includes an 8-bit DAC with an SPI™-compatible serial interface. The output of the step-up switching regulator is configured for a range of 40V to 90V and can provide up to 2mA. The EV kit is powered from a DC supply providing 4.5V to 5.5V. The EV kit can be reconfigured for an input voltage down to 3V.

The SPI-compatible serial interface can be connected to an IBM-compatible PC parallel port for evaluation. Windows® 95/98/2000-compatible software provides a user-friendly interface to demonstrate the features of the MAX1932 IC. The program is menu driven and offers a graphics interface with control buttons.

The MAX1932 EV kit features current-limit protection for the output. The MAX1932 thin QFN package and small external components permit the circuit area to be less than 0.6in x 0.9in.

Applications

  • Fiber Optic Network Equipment
  • Laser Range Finders
  • Optical Receivers and Modules
  • PIN Diode Bias Supply
  • Telecom Equipment
MAX1932EVKIT
MAX1932 Evaluation Kit

Latest Discussions

1 Years Ago
How to recovery from current limit status
2 Years Ago
SPI with MAX1932 is not working
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