SM802120 ClockWorksTM 125MHz LVDS / 125 MHz HCSL Ultra-Low Jitter Frequency Synthesizer General Description Features The SM802120 is a member of the ClockWorks family of devices from Micrel and provides an extremely low-noise timing solution. It is based upon a unique patented RotaryWave® architecture that provides very low phase noise. The device operates from a 3.3V or 2.5V power supply and synthesizes eight differential 125MHz output clocks, six LVDS and two HCSL. The SM802120 accepts a 25 MHz crystal input. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Generates six LVDS 125MHz clocks and two HCSL 125MHz clocks 2.5V or 3.3V operating range Typical phase jitter @ 125 MHz (1.875MHz to 20MHz): 100fs Industrial temperature range (–40C to +85C) Green, RoHS, and PFOS compliant Available in 44-pin 7mm 7mm QFN package __________________________________________________________________________________________________________ Block Diagram Ordering Part Number Information Marking Shipping Temperature Range Package ClockWorks is a trademark of Micrel, Inc RotaryWave is a registered trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com September 2011 M9999-092111-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 SM802120UMG 802120 Tray –40°C to +85°C 44-Pin QFN SM802120UMGTR 802120 Tape and Reel –40°C to +85°C 44-Pin QFN Note: 1. Devices are Green, RoHS, and PFOS compliant. Pin Configuration 44-Pin QFN (Top View) September 2011 2 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Pin Description Pin Number Pin Name 25, 26 /Q1, Q1 Pin Type Pin Level 28, 29 /Q2, Q2 32, 33 /Q3, Q3 35, 36 /Q4, Q4 41, 42 /Q5, Q5 1, 2 /Q6, Q6 4, 5 /Q7, Q7 7, 8 /Q8, Q8 31, 37, 38 VDDO1 PWR 43, 44, 16 VDDO2 PWR Power Supply for the Outputs on Bank 2 O, (DIF) LVDS O, (DIF) LVDS Pin Function Differential Clock Outputs from Bank 1 125MHz Differential Clock Outputs from Bank 2 125MHz Differential Clock Outputs from Bank 2 O, (DIF) HCSL 125MHz Power Supply for the Outputs on Bank 1 24, 39 VSSO1 PWR Power Supply Ground for the Outputs on Bank 1 3, 6, 40 VSSO2 PWR Power Supply Ground for the Outputs on Bank 2 10, 11, 14, 17, 20, 27, 30, 34 TEST 12, 13 VDD VSS 9, 21, 23 (Exposed Pad) Factory Test Pins. Do not connect anything to these pins. PWR Core Power Supply PWR Core Power Supply Ground. The exposed pad must be connected to the VSS ground plane. 18 XTAL_IN I, (SE) Crystal 19 XTAL_OUT O, (SE) Crystal 15 OE1 I, (SE) LVCMOS 22 OE2 I, (SE) LVCMOS Crystal Reference Input, no load caps needed. See Fig. 7. Crystal Reference Output, no load caps needed. See Fig. 7. Output Enable, Q1-Q4 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up Output Enable, Q5-Q8 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up Truth Table OE1/2 OUTPUTS 0 Tri-state 1 HCSL / LVDS September 2011 3 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Application Information Crystal Layout Keep the layers under the crystal as open as possible and do not place switching signals or noisy supplies under the crystal. Crystal load capacitance is built inside the die so no external capacitance is needed. See the Selecting a Quartz crystal for the Clockworks Flex I Family of Precision Synthesizers application note for further details. Contact Micrel’s HBW applications group if you need assistance on selecting a suitable crystal for your application at: [email protected]. September 2011 LVDS Outputs LVDS outputs are to be terminated with 100Ω across Q and /Q. For best performance, load all outputs. Outputs can be DC or AC-coupled. HCSL Outputs HCSL outputs are to be terminated with 50Ω to VSS. For best performance, load all outputs. For AC-coupled or to change the termination, contact Micrel’s application group: [email protected]. 4 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VDD, VDDO1/2) ……..............................+4.6V Input Voltage (VIN)……….……...........…-0.50V to VDD+0.5V Lead Temperature (soldering, 20 sec.)……........……260°C Case Temperature………………………… .........…….115°C Storage Temperature (Ts)……… ......... …..-65°C to +150°C Supply Voltage (VDD, VDDO1/2) ............... +2.375V to +3.465V Ambient Temperature (TA).......................... –40°C to +85°C (3) Junction Thermal Resistance QFN ( JA) Still-Air ............................................................... 24°C/W QFN ( JB) Junction-to-Board ................................................ 8°C/W DC Electrical Characteristics(4) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5%; VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5%; TA = 40°C to 85°C Symbol VDD, VDDO1/2 IDD Parameter Condition Min Typ Max Units 3.3V Operating Voltage VDDO1=VDDO2 3.135 3.3 3.465 V 2.5V Operating Voltage VDDO1=VDDO2 2.375 2.5 2.625 V Total supply current Outputs loaded 185 240 mA Typ Max Units 2 VDD + 0.3 V 0.3 0.8 V 5 A LVCMOS INPUT (OE1, OE2) DC Electrical Characteristics(4) VDD = 3.3V 5%, or 2.5V 5%, TA = 40°C to 85°C. Symbol Parameter Condition Min VIH Input High Voltage VIL Input Low Voltage IIH Input High Current VDD = VIN = 3.465V IIL Input Low Current VDD = 3.465V, VIN = 0V 150 A LVCMOS OUTPUT DC Electrical Characteristics(4) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5%, VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5% TA = 40°C to 85°C. RL = 100Ω across Q and /Q. Symbol Parameter Condition Min Typ Max Units VOD Differential Output Voltage Figures 1, 5 275 350 475 mV ΔVOD VOD Magnitude Change 40 mV VOS Offset Voltage 1.50 V ΔVOS VOS Magnitude Change 50 mV September 2011 1.15 5 1.25 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 HCSL OUTPUT DC Electrical Characteristics(4) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5%, VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5% TA = 40°C to 85°C. RL = 50Ω to VSS. Symbol Parameter Condition Min Typ Max VOH Output High Voltage Figures 1, 4 660 700 850 VOL Output Low Voltage -150 0 27 VCROSS Crossing Point Voltage 250 350 550 Crystal Characteristics Parameter Condition Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level 10pF to 12pF Load Min. Typ. Max. Units Fundamental, Parallel Resonant 25 50 1 5 10 100 MHz Ω pF uW AC Electrical Characteristics(4, 5) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5%; VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5%; TA = 40°C to 85°C. Symbol Parameter Condition FOUT Output Frequency TR/TF LVDS Output Rise/Fall Time 20% – 80%, Figures 2, 5 100 160 400 ps TR/TF HCSL Output Rise/Fall Time 20% – 80%, Figures 2, 4 150 300 450 ps ODC Output Duty Cycle HCSL, LVDS outputs 48 50 52 % TLOCK PLL Lock Time 20 ms (6) Tjit() RMS Phase Jitter (Output = 125MHz LVDS) (6) RMS Phase Jitter (Output = 125MHz HCSL) Spurious Noise Components Min Typ Max 125 Units MHz Integration Range:(12KHz – 20MHz) 250 fs Integration Range:(1.875MHz – 20MHz) 100 fs Integration Range:(12KHz – 20MHz) 250 fs Integration Range:(1.875MHz – 20MHz) 100 fs 25MHz (LVDS outputs) -80 25MHz (HCSL outputs) -85 dBc 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. 4. The circuit is designed to meet the AC and DC specifications shown in the above table after thermal equilibrium has been established. 5. All phase noise measurements were taken with an Agilent 5052B phase noise system 6. Measured using 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an external reference, the phase noise will follow the input source phase noise up to about 1MHz. September 2011 6 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Phase Noise Plots 125MHz LVDS Integrated Jitter 12KHz-20MHz 252fs 125MHz LVDS Integrated Jitter 1.875MHz-20MHz 102fs September 2011 7 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Phase Noise Plots (Continued) 125MHz HCSL Integrated Jitter 12KHz-20MHz 250fs 125MHz HCSL Integrated Jitter 1.875MHz-20MHz 100fs September 2011 8 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Figure 1. Duty Cycle TIming Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase/Noise/Jitter September 2011 9 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Figure 4. HCSL Output Load Figure 5. LVDS Output Load Figure 7. Crystal Input Interface September 2011 10 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Package Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2011 Micrel, Incorporated. September 2011 11 M9999-092911-A [email protected] or (408) 955-1690 Micrel, Inc. SM802120 Revision Template History Date Change Description/Edits by: 8/4/10 Added new paragraph to disclaimer in boiler plate. Per Colin Sturt. M.Galvan September 2011 Rev. 12 14 M9999-092911-A [email protected] or (408) 955-1690