DS1862A Rev 0 10/08 XFP Laser Control and Digital Diagnostic IC General Description Features The DS1862A is a closed-loop laser-driver control IC Implements XFP MSA Requirements for Digital with built-in digital diagnostics designed for XFP MSA. Diagnostics, Serial ID, and User Memory The laser control function incorporates automatic power 2 I C-Compatible Serial Interface control (APC) and allows extinction ratio control though Automatic Power Control (APC) a temperature-indexed lookup table (LUT). The DS1862A monitors up to seven analog inputs, including Extinction Ratio Control with Lookup Table temperature and monitor diode (MD) current, which are Seven Monitored Channels for Digital Diagnostics used to regulate the laser bias current and extinction (Five Basic Plus Two Auxiliary) ratio. Warning and alarm thresholds can be pro- Internal Calibration of Monitored Channels grammed to generate an interrupt if monitored signals (Temp, V , Bias Current, Transmitted, and CC2/3 exceed tolerance. Calibration is also provided internally Received Power) using independent gain and offset scaling registers for each of the monitored analog signals. Settings such as Programmable Quick-Trip Logic for Turning programmed calibration data are stored in password- Off Laser for Eye Safety protected EEPROM memory. Programming is accom- Access to Monitoring and ID Information 2 plished through an I C-compatible interface, which can Programmable Alarm and Warning Thresholds also be used to access diagnostic functionality. Operates from 3.3V or 5V Supply 25-Ball CSBGA, 5mm x 5mm Package Applications Internal or External Temperature Sensor Laser Control and Monitoring 10Gbps Optical Transceiver Modules (XFP) -40C to +100C Operating Temperature Range Laser Control and Monitoring One 8-Bit Buffered DAC Digital Diagnostics in Optical Transmission Pin Configuration Ordering Information PART TEMP RANGE PIN-PACKAGE TOP VIEW DS1862AB+ -40C to +100C 25 CSBGA 1 2 3 4 5 DS1862AB+T&R -40C to +100C 25 CSBGA + +Denotes a lead-free/RoHS-compliant package. A T&R = Tape and reel. P-DOWN/ SC-RX-LOS SC-RX-LOL THRSET V CC2 RST B RX-LOS SCL FETG RSSI MODSET C TX-D SDA EN1 EN2 BIASSET D Typical Operating Circuit appears at end of data sheet. INTERRUPT MOD-NR AUX1MON AUX2MON BMD E GND MOD-DESEL IBIASMON SC-TX-LOS V CC3 CSBGA (5mm x 5mm) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.XFP Laser Control and Digital Diagnostic IC ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Open-Drain Pin Voltage Range on SC-RX-LOS, Relative to Ground.............................................-0.5V to +6.0V SC-RX-LOL, RX-LOS, SC-TX-LOS, Voltage Range on MOD-DESEL, SDA, SCL, MOD-NR, EN1, EN2 ...........................-0.5V to (V + 0.5V)* CC2 FETG, THRSET, TX-D, AUX1MON, AUX2MON, Operating Temperature Range .........................-40C to +100C IBIASMON, RSSI, BIASSET, MODSET, EEPROM Programming Temperature Range .........0C to +70C EN1, EN2............................................-0.5V to (V + 0.5V)* Storage Temperature Range .............................-55C to +125C CC3 Soldering Temperature...........................Refer to the IPC JEDEC J-STD-020 Specification. *Not to exceed +6.0V. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS (V = +2.9V to +5.5V, T = -40C to +100C, unless otherwise noted.) CC3 A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Main Supply Voltage V (Note 1) +2.9 +5.5 V CC3 Secondary Supply Voltage V V not to exceed V (Note 2) +1.6 +3.6 V CC2 CC2 CC3 High-Level Input Voltage 0.7 x V + CC3 V I (max) = 10A V IH IH (SDA, SCL) V 0.5 CC3 Low-Level Input Voltage GND - 0.3 x V I (max) = -10A V IL IL (SDA, SCL) 0.3 V CC3 High-Level Input Voltage V + CC3 (TX-D, MOD-DESEL, V I (max) = 10A 2 V IH IH 0.3 P-DOWN/RST) (Note 3) Low-Level Input Voltage (TX-D, MOD-DESEL, V I (max) = -10A -0.3 +0.8 V IL IL P-DOWN/RST) (Note 3) 2 DS1862A