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MAX3287CUE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3287CUE Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 28 page  3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers ______________________________________________________________________________________ 11 force a shutdown if a fault is detected. The shutdown condition is latched until reset by a toggle of EN, EN, or power. Another safety system, open fiber control (OFC), uses safety interlocks to prevent eye hazards. To accommo- date the OFC standard, the MAX3286/MAX3296 series provide dual enable inputs and dual fault outputs. The safety circuitry contains fault detection, dual enable inputs, latched fault outputs, and a pulse generator (Figure 6). Safety circuitry monitors the APC circuit to detect unsafe levels of laser emission during single-point failures. A single-point failure can be a short to VCC or GND or a short between any two IC pins. Pulse Generator During startup, the laser does not emit light and the APC loop is not closed, triggering a fault signal. To allow startup, an internal fault-delay pulse disables the safety system for a programmable period of time, allowing the driver to begin operation. The length of the pulse is determined by the capacitor connected at FLTDLY and should be set 5 to 10 times longer than the APC time constant. The internal safety features can be disabled by connecting FLTDLY to GND. Note that EN must be high, EN must be low, and VCC must be in the opera- tional range for laser operation. Fault Detection The MAX3286/MAX3296 series has extensive and com- prehensive fault-detection features. All critical nodes are monitored for safety faults, and any node voltage that differs significantly from its expected value results in a fault (Table 1). When a fault condition is detected, the laser is shut down. See the Applications Information section for more information on laser safety. Shutdown The laser drivers offer dual redundant bias shutdown mechanisms. The SHDNDRV output drives an optional external MOSFET semiconductor. The bias and modu- lation drivers have separate internal disable signals. Latched Fault Output Two complementary FAULT outputs are provided with the MAX3286/MAX3296 series. In the event of a fault, these outputs latch until one of three events occurs: 1) The power is switched off, then on. VCC FLTDLY FAULT FAULT SHDNDRV (FROM POR CIRCUIT) REF_FAULT MONITOR_FAULT MD_FAULT POLARITY_FAULT TC_FAULT MOD_FAULT EN EN ENABLE Q R RESET DOMINANT FAULT LATCH FAULT DETECTION tFLTDLY PULSE GENERATOR MAX3286 MAX3296 S Figure 6. Simplified Safety Circuit Schematic 0.6 0.8 0.7 1.0 0.9 1.2 1.1 1.3 020 3040 10 50 60 70 80 90 100 110 JUNCTION TEMPERATURE (°C) RTC = OPEN TEMPCO = 50ppm/°C RTC ≥ 1.9kΩ RMOD = OPEN TEMPCO = 4000ppm/°C Figure 5. Modulation Current vs. Temperature for Maximum and Minimum Temperature Coefficient |
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