PI6CX201A 25MHz Jitter Attenuator Features • • • • • • • • • • Description The PI6CX201A is composed of a phase-locked loop with integrated VCXO oscillator for use in the clock jitter attenuation applications. It is optimized for use with a SaRonix-eCera™ crystal of 25MHz, and has typical output phase jitter less than 350fs (RMS). PLL with quartz stabilized VCXO Optimized for 25MHz input/output frequency Other frequencies available Low phase jitter less than 350fs typical Free run mode ±100ppm Single ended input and outputs 3.3V single supply Lock detection Industrial Temperature: –40°C to 85°C 20-pin TSSOP package Block Diagram Pin Configuration External VCXO Divider S0 S0 S1 S2 FB_CLK Charge Pump S1 PFD CLK_OUT1 CLK_OUT2 S2 Pre Divider Free_Run REF_CLK LF Lock Detector VC LD SaRonix-eCera xtal External Connection Required 12-0150 1 X1 1 20 X2 VC 2 19 AVDD AGND 3 18 DGND LF 4 17 CLK_OUT1 S0 5 16 LD S1 6 15 CLK _OUT2 S2 7 14 DVDD FREE_RUN 8 13 DGND DGND 9 12 FB_CLK DVDD 10 11 REF_CLK PI6CX201A Rev. C 01/03/2012 PI6CX201A 25MHz Jitter Attenuator Pin Descriptions for 20-pin TSSOP Package Pin Name Type Pin No Description XI I 1 Crystal input pin VC I 2 VCXO control voltage input LF I 4 Loop filter pin for external loop filter connection AGND PWR 3 Analog ground LVCMOS selection pins for internal CLK_OUT2 divider, Pins S0, S1, S2 I 5, 6, 7 have internal pull up resistor REF_CLK I 11 LVCMOS input clock signal to phase detector FB_CLK I 12 LVCMOS feedback clock signal to phase detector DGND PWR 9, 13, 18 Digital ground DVDD PWR 10, 14 Digital power LVCMOS output clock of the internal VCXO with divider CLK_OUT2 O 15 controlled by S0 and S1 LVCMOS lock detect output, LD output is logic ‘0’ when REF_CLKx is greater than 1MHz, and phase difference beLD O 16 tween REF_CLKx and FB_CLK is more than 2ns for 8 consecutive clock pulses. The clock pulse frequency is equal to the crystal frequency. CLK_OUT1 O 17 LVCMOS output clock of the internal VCXO AVDD PWR 19 Analog power X2 O 20 Crystal output pin When FREE_RUN is logic low, chip is in "free run" mode. The output will remain fixed at a fixed frequency with up to FREE_RUN I 8 a ±100ppm offset from the nominal 25MHz. Logic HIGH is normal mode, with output locked to the input. Internal pull-up. Frequency Selection Table Input Frequency 25MHz 12.5MHz 33.33MHz 66.67MHz 12-0150 S0 1 0 0 1 S1 0 0 1 1 2 S2 1 1 1 1 Output Frequency 25MHz 25MHz 25MHz 25MHz PI6CX201A Rev. C 01/03/2012 PI6CX201A 25MHz Jitter Attenuator Application Diagram 25 MHz (SaRonix-eCera GC2500065 commercial temp) (SaRonix-eCera GC2500099 industrial temp) VDD C2 X1 VC C1 R1 AGND LF S0 S1 S2 FREE_RUN DGND .01µF VDD DVDD 1 20 X2 Ferrite bead AVDD 2 19 3 18 4 17 5 16 6 15 7 14 8 13 DGND 9 12 10 11 FB_CLK REF_CLK XGND .01µF 10µF CLK _OUT1 LD CLK _OUT2 VDD .01µF DVDD Notes: 1.A feedback clock is required for lock. Pin 15 can be connected to pin 12 as shown above. 2.The network R1, C1:C2 comprises the external loop filter. The loop bandwidth and jitter peaking profiles are set by changing these values. Please consult factory to meet your requirement. 3.The crystal and loop filter components should be placed on the same side of the board as the IC. Components should be placed as close as possible to IC (within 300 mils). 4.A ground ring should enclose the loop filterr components along with pins 2 and 4. 12-0150 3 PI6CX201A Rev. C 01/03/2012 PI6CX201A 25MHz Jitter Attenuator Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested) Note: Storage temperature ................................................ -65 to +150ºC Supply Voltage to Ground Potential (VDD).............-0.5 to +4.6V Inputs (Referenced to GND)................................ -0.5 to VDD+0.5V Clock Output (Referenced to GND).................. -0.5 to VDD+0.5V Soldering Temperature (Max of 10 seconds)...................... 260ºC Latch up ....................................................................................... 200mA ESD Protection (HBM) ............................................................... 2000V 3.3V DC Electrical Characteristics Parameter Description VDD 3.3V Supply Voltage VIL Input LOW Voltage VIH Input HIGH Voltage IIL Input LOW Current IIH Input HIGH Current VOL Output LOW Voltage VOH Output HIGH Voltage TA Ambient Operatin Temperature 3.3V AC Electrical Characteristics Parameter Description FO Output Frequency BW Control Voltage Band Width ΔFCLK Control Pull Range tIDC Input Duty Cycle tDC Output Duty Cycle tR, tF Rise and Fall Time tR, tF Rise and Fall Time Jp Ffree Phase Jitter (RMS) Free Run Accuracy 12-0150 Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Test Conditions Min. 3.135 2 –50 VIN = 0V VIN = VDD IOL = 8mA IOL = -8mA Test Conditions CL = 15pF -3 dB, VC=1.65V 0V ≤ VC ≤ VDD Measured at VDD/2 Measured at VDD/2, 15pF load CLK_OUT1 Measured from 0.5V to 2.5V, CL = 0pF CLK_OUT1 Measured from 0.5V to 2.5V, CL = 15pF 12kHz to 5Mhz 4 Max 3.465 0.8 VDD + 0.3 10 0.4 2.4 -40 Min. 85 Units V μA V V °C Max 40 Typ 25 25 ±140 50 60 Units MHz KHz ppm % 45 50 55 % 2 ns 3 ns 0.5 ±100 ps ppm 0.35 PI6CX201A Rev. C 01/03/2012 PI6CX201A 25MHz Jitter Attenuator Loop Filter Selection Table Loop Band Charge Pump VCO Gain Width Current 100Hz 32uA 2.5KHz/V Feedback Divider 1 R1 C1 C2 5.1K Ohm 1uF 0.1uF Packaging Mechanicals: 20-Pin TSSOP (L) Recommended Crystal: SaRonix-eCERA Part Number: GC2500065 Ordering Information(1-3) Notes: Ordering Code Package Code Package Description PI6CX201ALE L 20-pin TSSOP, Pb-free & Green GC2500065 N/A Commercial temperature 49S SMD Crystal GC2500099 N/A Industrial temperature 49S SMD Crystal 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ 2. E = Pb-free and Green 3. Adding an X suffix = Tape/Reel Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com 12-0150 5 PI6CX201A Rev. C 01/03/2012