Key facts
- Brand
- Maxim
- Model
- 5GBPS
- Industry
- Industrial
- Documents
- 5
- Languages
- EN
- Last added
- 2012-05-08
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Maxim MAX3869 3.3V 2.5Gbps SDH/SONET Laser Driver Datasheet
The Maxim MAX3869 provides bias and modulation current sources for high‑speed optical transmitters. It accepts differential PECL data and clock inputs, includes an automatic power control (APC) loop, and offers enable control, current monitors, and a failure‑monitor output. The device is available in 32‑pin TQFP and QFN packages and is designed for 25 Ω laser loads.
Key features include programmable bias (1 mA‑100 mA) and modulation (5 mA‑60 mA) currents, 87 ps rise/fall times, and a built‑in APC loop that maintains constant average optical power over temperature and lifetime. External components such as a damping resistor, pull‑up inductor, and AC‑coupling capacitor are recommended for optimal performance.
Maxim 5GBPS specifications
| Supply Voltage | +3.3 V (single‑supply) |
|---|---|
| Bias Current Range | 1 mA to 100 mA (programmable) |
| Modulation Current Range | 5 mA to 60 mA (programmable) |
| Rise/Fall Time | 87 ps |
| Supply Current at +3.3 V | 64 mA |
| Maximum Data Rate | 2.5 Gbps |
| APC Failure Indicator | FAIL pin goes low on APC loop failure |
Source: Maxim MAX3869 3.3V 2.5Gbps SDH/SONET Laser Driver Datasheet
All Maxim 5GBPS documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What happens when the ENABLE pin is low?
Both the bias and modulation currents are turned off when ENABLE is low.
From: Maxim MAX3869 3.3V 2.5Gbps SDH/SONET Laser Driver Datasheet
How is the APC failure signaled?
The FAIL TTL/CMOS output pin is driven low when the APC loop cannot maintain the desired average optical power.
From: Maxim MAX3869 3.3V 2.5Gbps SDH/SONET Laser Driver Datasheet
What is the supply voltage range for the MAX3784/MAX3784A?
The device operates from –0.5 V to +6 V.
How much power does the MAX3784 consume in normal operation?
It consumes 185 mW at +3.3 V in low‑power mode.
What supply voltage does the MAX3273 require?
The MAX3273 operates from a single +3.3 V supply.
What is the typical fall time of the modulation output?
The typical fall time is 59 ps.