PDF DS1862A Data sheet ( Hoja de datos )

Número de pieza	DS1862A
Descripción	XFP Laser Control and Digital Diagnostic IC
Fabricantes	Maxim Integrated Products
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No Preview Available ! Rev 0; 10/08 www.DataSheet4U.com XFP Laser Control and Digital Diagnostic IC General Description The DS1862A is a closed-loop laser-driver control IC with built-in digital diagnostics designed for XFP MSA. The laser control function incorporates automatic power control (APC) and allows extinction ratio control though a temperature-indexed lookup table (LUT). The DS1862A monitors up to seven analog inputs, including temperature and monitor diode (MD) current, which are used to regulate the laser bias current and extinction ratio. Warning and alarm thresholds can be pro- grammed to generate an interrupt if monitored signals exceed tolerance. Calibration is also provided internally using independent gain and offset scaling registers for each of the monitored analog signals. Settings such as programmed calibration data are stored in password- protected EEPROM memory. Programming is accom- plished through an I2C-compatible interface, which can also be used to access diagnostic functionality. Applications Laser Control and Monitoring 10Gbps Optical Transceiver Modules (XFP) Laser Control and Monitoring Digital Diagnostics in Optical Transmission Features ♦ Implements XFP MSA Requirements for Digital Diagnostics, Serial ID, and User Memory ♦ I2C-Compatible Serial Interface ♦ Automatic Power Control (APC) ♦ Extinction Ratio Control with Lookup Table ♦ Seven Monitored Channels for Digital Diagnostics (Five Basic Plus Two Auxiliary) ♦ Internal Calibration of Monitored Channels (Temp, VCC2/3, Bias Current, Transmitted, and Received Power) ♦ Programmable Quick-Trip Logic for Turning Off Laser for Eye Safety ♦ Access to Monitoring and ID Information ♦ Programmable Alarm and Warning Thresholds ♦ Operates from 3.3V or 5V Supply ♦ 25-Ball CSBGA, 5mm x 5mm Package ♦ Internal or External Temperature Sensor ♦ -40°C to +100°C Operating Temperature Range ♦ One 8-Bit Buffered DAC Pin Configuration TOP VIEW 123 + A P-DOWN/ SC-RX-LOS SC-RX-LOL RST B RX-LOS SCL FETG 4 THRSET RSSI 5 VCC2 MODSET C TX-D SDA EN1 EN2 BIASSET D INTERRUPT MOD-NR AUX1MON AUX2MON BMD E GND MOD-DESEL IBIASMON SC-TX-LOS VCC3 CSBGA (5mm x 5mm) Ordering Information PART TEMP RANGE PIN-PACKAGE DS1862AB+ -40°C to +100°C 25 CSBGA DS1862AB+T&R -40°C to +100°C 25 CSBGA +Denotes a lead-free/RoHS-compliant package. T&R = Tape and reel. Typical Operating Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 page www.DataSheet4U.com XFP Laser Control and Digital Diagnostic IC ANALOG OUTPUT CHARACTERISTICS (continued) (VCC3 = +2.9V to +5.5V, VCC2 = +1.6V to +3.6V, TA = -40°C to +100°C, unless otherwise noted.) PARAMETER IMODSET Accuracy IMODSET DNL IMODSET INL IMODSET Temp Drift IMODSET Voltage Drift IMODSET FS Accuracy APC Bandwidth SYMBOL CONDITIONS +25°C, IMODSET = 0.04mA to 1.2mA 75μA range 150μA range 300μA range 600μA range 1200μA range 75μA range 150μA range 300μA range 600μA range 1200μA range IMD / IAPC = 1 (Note 4) MIN TYP MAX UNITS -1.5 +1.5 % -0.9 +0.9 -0.9 +0.9 -0.9 +0.9 LSB -0.9 +0.9 -0.9 +0.9 -1.5 +1.5 -1.5 +1.5 -1.0 +1.0 LSB -1.0 +1.0 -1.0 +1.0 5% 1.2 %/V 1.5 % 6 10 30 kHz AC ELECTRICAL CHARACTERISTICS—XFP CONTROLLER (VCC3 = +2.9V to +5.5V, VCC2 = +1.6V to +3.6V, TA = -40°C to +100°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN Time to Initialize TX-D Assert Time TX-D Deassert Time P-DOWN/RST Assert Time P-DOWN/RST Deassert Time MOD-DESEL Deassert Time INTERRUPT Assert Delay INTERRUPT Deassert Delay MOD-NR Assert Delay MOD-NR Deassert Delay RX-LOS Assert Time RX-LOS Deassert Time P-DOWN/RST Reset Time Shutdown Time tINIT VCC3 within ±5% of nominal tOFF IBIAS and IMOD below 10% of nominal tON IBIAS and IMOD above 90% of nominal tPDR-ON IBIAS and IMOD below 10% of nominal tPDR-OFF IBIAS and IMOD above 90% of nominal tMOD-DESEL Time until proper response to I2C communication tINIT_ON Time from fault to interrupt assertion tINIT_OFF Time from read (clear flags) to interrupt deassertion tMOD-NR-ON Time from fault to MOD-NR assertion tMOD-NR-OFF Time from read (clear flags) to MOD-NR deassertion tLOS-ON Time from SC-RX-LOS assertion to RX-LOS assertion tLOS-OFF Time from SC-RX-LOS deassertion to RX-LOS deassertion tRESET Time from P-DOWN/RST assertion to initial reset tFAULT Time from fault to IBIASSET, IMODSET, and IBMD below 10% 30 10 TYP MAX 200 5 1 100 200 2 100 500 0.5 0.5 UNITS ms μs ms μs ms ms ms μs ms ms 100 ns 100 ns μs 30 μs _______________________________________________________________________________________ 5 5 Page www.DataSheet4U.com XFP Laser Control and Digital Diagnostic IC Timing Diagrams (continued) OCCURRENCE OF MONITOR CHANNEL FAULT INTERRUPT READ FLAGS tINIT_ON tINIT_OFF Figure 7. Monitor Channel Fault Timing ______________________________________________________________________________________ 11 11 Page

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