PDF DS1862 Data sheet ( Hoja de datos )

Número de pieza	DS1862
Descripción	XFP Laser Control and Digital Diagnostic IC
Fabricantes	Maxim Integrated Products
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No Preview Available ! www.DataSheet4U.com Rev 0; 2/06 XFP Laser Control and Digital Diagnostic IC General Description The DS1862 is a closed-loop laser-driver control IC with built-in digital diagnostics designed for XFP MSA. The laser control function incorporates average power con- trol (APC) and allows extinction ratio control though a temperature indexed look-up table (LUT). The DS1862 monitors up to seven analog inputs, including tempera- ture and monitor diode (MD) current, which are used to regulate the laser bias current and extinction ratio. Warning and alarm thresholds can be programmed to generate an interrupt if monitored signals exceed toler- ance. Calibration is also provided internally using inde- pendent gain and offset scaling registers for each of the monitored analog signals. Settings such as pro- grammed calibration data are stored in password-pro- tected EEPROM memory. Programming is accomplished 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 Look-Up 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-Pin CSBGA, 5mm x 5mm Package ♦ Internal or External Temperature Sensor ♦ -40°C to +100°C Operating Temperature Range ♦ One 8-Bit Buffered DAC TOP VIEW A 1 B C D E Pin Configuration 2345 Ordering Information PART TEMP RANGE DS1862B -40°C to +100°C DS1862B+ -40°C to +100°C +Denotes lead-free package. PIN-PACKAGE 25 CSBGA (5mm x 5mm) 25 CSBGA (5mm x 5mm) CSBGA (5mm x 5mm) Typical Operating Circuit appears at end of data sheet. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. ______________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 page 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 CHARACTERISICS—XFP CONTROLLER (VCC3 = +2.9V to +5.5V, VCC2 = +1.6V to +3.6V, TA = -40°C to +100°C, unless otherwise noted.) PARAMETER 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 SYMBOL CONDITIONS tINIT VCC3 within ±5% of nominal tOFF tON IBIAS and IMOD below 10% of nominal IBIAS and IMOD above 90% of nominal tPDR-ON IBIAS and IMOD below 10% of nominal tPDR-OFF tMOD-DESEL IBIAS and IMOD above 90% of nominal Time until proper response to I2C communication tINT-ON tINT-OFF Time from fault to interrupt assertion 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% MIN 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 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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