MAX3670 19-2166 Rev 2 9/09 E V A L U A T I O N K I T A V A I L A B L E Low-Jitter 155MHz/622MHz Clock Generator General Description Features The MAX3670 is a low-jitter 155MHz/622MHz reference Single +3.3V or +5.0V Supply clock generator IC designed for system clock distribution Power Dissipation: 150mW at +3.3V Supply and frequency synchronization in OC-48 and OC-192 SONET/SDH and WDM transmission systems. The External VCO Center Frequencies (f ): 155MHz VCO MAX3670 integrates a phase/frequency detector, an to 670MHz operational amplifier (op amp), prescaler dividers and Reference Clock Frequencies: f , f /2, f /8 VCO VCO VCO input/output buffers. Using an external VCO, the MAX3670 can be configured easily as a phase-lock loop Main Clock Output Frequency: f VCO with bandwidth programmable from 15Hz to 20kHz. Optional Output Clock Frequencies: f , f /2, VCO VCO The MAX3670 operates from a single +3.3V or +5.0V f /4, f /8 VCO VCO supply, and dissipates 150mW (typ) at 3.3V. The operat- ing temperature range is from -40C to +85C. The chip Low Intrinsic Jitter: < 0.4ps RMS is available in a 5mm 5mm, 32-pin QFN package. Loss-of-Lock Indicator PECL Clock Output Interface Applications Ordering Information OC-12 to OC-192 SONET/WDM Transport Systems PART TEMP RANGE PIN-PACKAGE Clock Jitter Clean-Up and Frequency MAX3670EGJ -40C to +85C 32 QFN-EP* Synchronization MAX3670ETJ+ -40C to +85C 32 Thin QFN-EP* Frequency Conversion +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. System Clock Distribution Pin Configuration appears at end of data sheet. Typical Application Circuit 3.3V 142 155MHz MAX3892 VCCD REFCLK+ MOUT+ 16:1 SERIALIZER MOUT- REFCLK- 142 3.3V 142 VCOIN+ VCO N.C. RSEL K = 25kHz/V VCO 100 N.C. 155MHz VSEL VCOIN- MAX3670 142 GSEL1 N.C. 332 GSEL2 VC 4700pF GSEL3 0.01F 500k OPAMP- OPAMP+ POLAR GND 3.3V 4700pF 500k SETUP FOR 10kHz LOOP BANDWIDTH REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE. 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.Low-Jitter 155MHz/622MHz Clock Generator ABSOLUTE MAXIMUM RATINGS Supply Voltage Range..............................................-0.5V to +7V PECL Output Current (MOUT+, Voltage Range at C2+, C2-, THADJ, CTH, GSEL1, GSEL2, MOUT-, POUT+, POUT-).................................................56mA GSEL3, LOL, RSEL, REFCLK-, REFCLK+, VSEL, VCOIN+, Operating Temperature Range ...........................-40C to +85C VCOIN-, VC, POLAR, PSEL1, PSEL2, COMP, Storage Temperature Range...........................-65C to +160C OPAMP+, OPAMP- ..................................-0.5V to (V + 0.5V) Lead Temperature (soldering, 10s) .................................+300C CC Continuous Power Dissipation (T = +70C) A 32 QFN (derate 33.3mW/C above +70C) .....................2.7W 32 Thin QFN (derate 34.5mW/C above +70C)..............2.8W 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. DC ELECTRICAL CHARACTERISTICS (V = +3.3V 10% or V = +5.0V 10%, T = -40C to +85C. Typical values are at V = +3.3V and T = +25C, unless other- CC CC A CC A wise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 2) 48 72 mA CC INPUT SPECIFICATIONS (REFCLK, VCOIN) V - V - CC CC Input High Voltage V V IH 1.16 0.88 V - V - CC CC Input Low Voltage V V IL 1.81 1.48 V - CC Input Bias Voltage V 1.3 Common-Mode Input Resistance 7.5 11.5 17.5 k Differential Input Resistance 12.8 21.0 32.5 k Differential Input Voltage Swing AC-coupled 300 1900 mVp-p PECL OUTPUT SPECIFICATIONS V - V - CC CC 0C to +85C 1.025 0.88 Output High Voltage V V OH V - V - CC CC -40C to 0C 1.085 0.88 V - V - CC CC 0C to +85C 1.81 1.62 Output Low Voltage V V OL V - V - CC CC -40C to 0C 1.83 1.556 TTL SPECIFICATIONS Output High Voltage V Sourcing 20A 2.4 V V OH CC Output Low Voltage V Sinking 2mA 0.4 V OL 2 MAX3670