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OC-48 Laser Driver
Key Features
- DC-coupled to laser diode
- Typical rise time and fall time of 60 ps
- Enable/disable control
- Automatic optical average power control
- Modulation and bias current monitors
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The VSC7940 is a single +5 V supply laser diode driver for SONET/SDH applications up to 3.125 Gbps. External resistors set a wide range of bias and modulation currents for driving the laser. Data and clock inputs accept differential PECL signals. The Automatic Power Control (APC) loop maintains a constant average optical power over temperature and lifetime. The dominant pole of the APC loop can be controlled with an external capacitor. Other features include enable/disable control, and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The VSC7940 is available in a 32-pin TQFP package.
| Product Variants | Description |
| VSC7940RP | 32-pin 5 x 5 mm TQFP |
| VSC7940XRP | 32-pin 5 x 5 mm TQFP lead-free second-level interconnect |
| VSC7940-W | [Obsolete] Bare die in waffle pack |
| Add to Cart | Category | Title | Access | Revision | Posted | Type | Size |
|
|
Product Brief | SFF/SFP IC Solutions |
|
1.0 | 03/18/2009 |  |
607 kB |
| Datasheet | VSC7940 Data Sheet | 
|
4.2 | 06/17/2010 | |
268 kB | |
|
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Application Note | PON IC Solutions |
|
1.4 | 03/25/2010 | |
613 kB |
| Reports | VSC7939RP and VSC7940RP Material Composition Declaration |
|
1.0 | 07/28/2006 | |
2 MB | |
| Reports | VSC7939XRP and VSC7940XRP Material Composition Declaration |
|
2.0 | 04/10/2008 | |
1 MB | |
| Reports | First Level Product Qualification Report for VSC7940XRP |
|
1.0 | 06/25/2010 | |
62 kB |
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