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MAX3646ETG+ Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX3646ETG+ Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 14 page 155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control _______________________________________________________________________________________ 3 Note 1: AC characterization is performed using the circuit in Figure 2 using a PRBS 2 23 - 1 or equivalent pattern. Note 2: Specifications at -40°C are guaranteed by design and characterization. Note 3: Excluding IBIAS and IMOD. Input data is AC-coupled. TX_FAULT open, SHUTDOWN open. Note 4: Power-supply noise rejection (PSNR) = 20log10(Vnoise (on VCC) / ∆VOUT). VOUT is the voltage across the 15Ω load when IN+ is high. Note 5: The minimum required voltage at the OUT+ and OUT- pins is +0.75V. Note 6: Guaranteed by design and characterization. Note 7: Tested with 00001111 pattern at 622Mbps. Note 8: DJ includes pulse-width distortion (PWD). PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS APC Loop Time Constant CAPC_FILT = 0.01µF, ∆IMD / ∆IBIAS = 1/70 3.3 µs APC Setting Stability (Note 6) ±100 ±480 ppm/ °C APC Setting Accuracy TA = +25°C ±15 % IMOD Compensation-Setting Range by Bias KK = ∆IMOD / ∆IBIAS 0 1.5 mA/mA IMOD Compensation-Setting Range by Temperature TC TC = ∆IMOD / ∆T (Note 6) 0 1.0 mA/ °C Threshold-Setting Range for Temperature Compensation TTH (Note 6) +10 +60 °C LASER SAFETY AND CONTROL Bias and Modulation Turn-Off Delay CAPC_FILT = 0.01µF, ∆IMD / ∆IBIAS = 1/80 (Note 6) 5µs Bias and Modulation Turn-On Delay CAPC_FILT = 0.01µF, ∆IMD / ∆IBIAS = 1/80 (Note 6) 600 µs Threshold Voltage at Monitor Pins VREF Figure 5 1.14 1.3 1.39 V INTERFACE SIGNALS TX_DISABLE Input High VHI 2.0 V TX_DISABLE Input Low VLO RPULL = 45kΩ (typical) 0.8 V VHI = VCC 15 TX_DISABLE Input Current VLO = GND -70 -140 µA TX_FAULT Output Low Sinking 1mA, open collector 0.4 V Shutdown Output High Sourcing 100µA VCC - 0.4 V Shutdown Output Low Sinking 100µA 0.4 V ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.97V to +3.63V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IBIAS = 60mA, IMOD = 60mA, TA = +25°C, unless otherwise noted.) (Notes 1, 2) |
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