MAX1932
PRODUCTIONDigitally Controlled, 0.5% Accurate, Safest APD Bias Supply
- Part Models
- 3
- 1ku List Price
- Starting From $9.84
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
Documentation
Data Sheet 1
Design Note 1
Technical Articles 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX1932ETC+ | Thin Quad Flatpack, No Leads | ||
| MAX1932ETC+T | Thin Quad Flatpack, No Leads | ||
| MAX1932ETC/GG8 | Thin Quad Flatpack, No Leads |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 23, 2026 - 2026-0082 ASSEMBLY |
||
| MAX1932ETC+ | PRODUCTION | |
| MAX1932ETC+T | PRODUCTION | |
|
Mar 13, 2023 - 2361N WAFER FAB |
||
| MAX1932ETC+ | PRODUCTION | |
| MAX1932ETC+T | PRODUCTION | |
|
Jun 20, 2016 - 1612 ASSEMBLY |
||
| MAX1932ETC+ | PRODUCTION | |
| MAX1932ETC+T | PRODUCTION | |
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX1932ETC+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareTools & Simulations
Software Development 1
Evaluation Kits
MAX1932 Evaluation Kit