MK1575-01 RENESAS | Alldatasheet

Document overview

  • Manufacturer or author: mamiller
  • PDF pages: 15

Technical content

Features

  • Long-term output jitter <2 nsec over 10 μsec period
  • External PLL clock feedback path enable “zero delay” I/O clock skew configuration
  • Selectable internal feedback divider provides popular t elecom and video clock frequencies (see tables below)
  • Can optionally use external feedback divider to generate other output frequencies.
  • Single 3.3 V supply, low-power CMOS
  • Power-down mode and output tri-state (pin OE)
  • Packaged in 16-pin TSSOP
  • Pb (lead) free package
  • Industrial temperature range available Pre-Configured Input/Output Frequency Combinations: Telecom T/E Clock Modes (rising edge aligned): Video Clock Modes (falling edge aligned): Block Diagram The standard external clock feedback configuration is shown. Use this configuration for the pre-configured input/output frequency combinations listed above. Addr FS2:0 Input Clock Output Clocks (MHz) Clock Type CLK1 CLK2 000 8 kHz 3.088 1.544 T1 001 8 kHz 16.384 2.048 E1 010 8 kHz 34.368 17.184 E3 011 8 kHz 44.736 22.368 T3 Addr FS2:0 Input Clock (kHz) Output Clocks (MHz) Clock Type CLK1 CLK2 100 15.625 54 27 PAL 601 101 15.734 54 27 NTSC 601 110 15.625 35.468 17.734 PAL 4xf sc 111 15.734 28.636 14.318 NTSC 4xf sc REFIN FBIN CLK1Clock Input MUX Charge Pump VCO CHGP VS Divider Phase Detector CHPR MUX CB RS CS FCLK Divider CLK2 Divider Divider LUT CLK2 FCLK FS2:0 External Feedback Clock Connection OE 300 pF

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 2 MK1575-01 REV P 051310 Pin Assignment 16 pin 4.40 mil body, 0.65 mil pitch TSSOP Pin Descriptions REFIN FBIN FS0 VDDA NC VDDD FCLK FS1 GNDA OE CLK2 FS2 GNDD CLK1 CHGP CHPR Pin Number Pin Name Pin Type Pin Description

1 REFIN Input

Reference clock input. Connect the input clock to this pin. Can be Rising or Falling edge triggered as per Detailed Mode Selection Table, page 3. 2F S 0 I n p u t Frequency Selection Input bit 0, selects internal divider values as per Detailed Mode Selection Table, page 3. 3 VDDA Power Power supply connection for internal VCO and other analog circuits. 4 VDDD Power Power supply connection for internal digital circuits and output buffers. 5F S 1 I n p u t Frequency Selection Input bit 1, selects internal divider values as per Detailed Mode Selection Table, page 3. 6 GNDA Ground Ground connection for internal VCO and other analog circuits. 7 GNDD Ground Ground connection for internal digital circuits and output buffers. 8 CHGP — Loop filter connection, active node. 9 CHPR — Loop filter connection, reference node. Do not connect to ground. 10 CLK1 Output Output clock 1.

11 FS2 Input Frequency Selection Input bit 2, selects internal divider values as per

Detailed Mode Selection Table, page 3. 12 CLK2 Output Output clock 2. 13 OE Input Output Enable, tristates CLK1, CLK2, FCLK and powers down PLL when high. Internal pull-up.

14 FCLK Output Feedback clock output, connect to FBIN for the pre-configured

frequency combinations listed in the tables on page 1. 15 NC — No internal connection, connect to ground.

16 FBIN Input

Feedback clock input. Connect to CLK1, CLK2, FCLK, or the output of an external feedback divider, depending on application. Refer to document text for more information.

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 3 MK1575-01 REV P 051310 Detailed Mode Selection Table Refer to this table when not using the standard external clock feedback configuration shown on page 1. Block Diagram, Showing Device Configuration Options Address FS2:0 Internal Divider Settings FBIN, REFIN Clock Edge CLK1 Output Frequency RangeVS Divider CLK2 Divider FCLK Divider 000 64 2 386 Rising 1.5 - 5 MHz 001 16 8 2048 Rising 6 - 20 MHz 010 8 2 4296 Rising 12 - 40 MHz 011 4 2 5592 Rising 24 - 80 MHz 100 4 2 3456 Falling 24 - 80 MHz 101 4 2 3432 Falling 24 - 80 MHz 110 8 2 2270 Falling 12 - 40 MHz 111 8 2 1820 Falling 12 - 40 MHz REFIN FBIN CLK1Clock Input MUX Charge Pump VCO CHGP VS Divider Phase Detector CHPR MUX CB RS CS FCLK Divider CLK2 Divider Divider LUT CLK2 FCLK FS2:0 FB Divider Optional External Feedback Divider Feedback Clock Options (only connect one output) OE 300 pF

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 4 MK1575-01 REV P 051310 Functional Description The MK1575-01 is a PLL (phase-locked loop) based clock generator that generates output clocks synchronized to an input reference clock. The device can be used in the standard configuration as described on page 1, or optionally can use an external divider in the clock feedback path to produce other frequency multiplication factors. External components are used to control the PLL loop response. The use of external loop components enables a lower PLL loop bandwidth which is needed when accepting low frequency input clocks such as those listed in the tables on page 1. PLL Clock Feedback Options FCLK to FBIN This is the standard configuration that is used for the pre-configured input / output frequency combinations listed on page 1. By including an external divider in the feedback path (“FB Divider” in the Block Diagram of page 3) the output clock frequency can be increased. Refer to the Output Frequency Calculation table below. CLK1 to FBIN When no external feedback divider is used, this option configures the device as a zero-delay buffer and the frequency of CLK1 is the same as the input reference clock. Including an external divider in the feedback path will increase the output clock frequency. Refer to the Output Frequency Calculation table below. CLK2 to FBIN Like the above configuration, this option configures the device as a zero-delay buffer when no external feedback divider is used, and the frequency of CLK2 is the same as the input reference clock. Including an external divider in the feedback path will increase the output clock frequency. Refer to the Output Frequency Calculation table below. Frequency and Bandwith Calculations Notes: 1) FB = 1 when no feedback divider is used. 2) Refer to the Detail Mode Selection Table on page 3 for possible divider combinations. 3) The VCO frequency needs to be considered in all applications (see table below). 4) The external loop filter also needs to be considered. 5) Minimum VCO frequency = 96 MHz. 6) Maximum VCO frequency = 320 MHz. 7) To minimize output jitter, use the highest possible VCO frequency allowed by the application. Feedback Path Option Output Clock Frequency CLK1 CLK2 FCLK VCO Frequency “N” Factor FCLK to FBIN fIN x FB x FCLK2 x VS CLK1 to FBIN fIN x FB x VS CLK2 to FBIN fIN FB× FCLK× fIN FB× FCLK fIN FB× fIN FB× fIN FB× CLK2× fIN FB× fIN FB× CLK2

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 5 MK1575-01 REV P 051310 Setting PLL Loop Bandwidth and Damping Factor The frequency response of the MK1575-01 PLL may be approximated by the following equation: Normalized PLL Bandwidth The associated damping factor is calculated as follows: Damping factor, Where: KO = VCO gain in Hz/Volt (use 340 MHz/V) Icp = Charge pump current, 12.5 μA N = Total feedback divide from VCO, (Refer to N Value table, below) CS = External loop filter capacitor in Farads RS = Loop filter resistor in Ohms The above bandwidth equation calculates the “normalized” loop bandwidth which is approximately equal to the - 3dB bandwidth. This approximate calculation does not take into account the effects of damping factor or the third pole imposed by C P. It does, however, provide a useful approximation of filter performance. To prevent jitter on the output clocks due to modulation of the PLL by the input reference frequency, the following general rule should be observed: In general, the loop damping factor should be 0.7 or greater to ensure output stability. For video applications, a low damping factor (0.7 to 1.0) is generally desired for fast genlocking. For telecom applications, a higher damping factor is usually desirable. A higher damping factor will create less passband gain peaking which will minimize the gain of network clock wander amplitude. A higher damping factor may also increase output clock jitter when there is excess digital noise in the system application, due to the reduced ability of the PLL to respond to, and therefore compensate for, phase noise ingress. Notes on setting the value of CP As another general rule, the following relationship should be maintained between components C1 and C2 in the external loop filter: Where: C B = External bypass capacitor in Farads Note that the MK1575-01 contains an internal 300 pF filter cap which is connected in parallel with external device CB. This helps to reduce output clock jitter. In some applications external device C B will not be required. CP establishes a second pole in the PLL loop filter. For higher damping factors (>1), calculate the value of CP based on a CS value that would be used for a damping factor of 1. This will minimize baseband peaking and loop instability that can lead to output jitter. CP also helps to damp VCO input voltage modulation caused by the charge pump correction pulses. A CP value that is too low will result in increased output phase noise at the phase detector frequency due to this. In extreme cases where input jitter is high, charge pump current is high, and C P is too small, the VCO input voltage can hit the supply or ground rail resulting in non-linear loop response. The best way to set the value of CP is to use the External Loop Filter Solver located on the IDT web site. RS KO ICP⋅⋅() ζ RS KO ICP CS⋅⋅ PLL Bandwidth fPhase Detector CP CS CP CB 300 pF+ =

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 6 MK1575-01 REV P 051310 Loop Filter Capacitor Type Clock Jitter and input-to-output skew performance of the MK1575-01 can be affected by loop filter capacitor type. Cost vs. performance trade-offs can be made when choosing capacitor types. Performance differences are best determined through experimentation. Recommended capacitors can be found at http://www.idt.com. Example Loop Filter Component Values for Pre-Configured Frequency Combinations Listed on Page 1. Notes: 1) This loop filter selection is optimized for cost and component size. It provides stable clock outputs and moderate input reference jitter attenuation. This configuration could be used when producing an internal system clock, one which will not be used as a data transmit clock when locked to a recovered data clock. 2) This loop filter selection is optimized for low pass-band peaking. This configuration should be used when generating data transmit clock that is locked to a recovered data clock. This will ensure that the data clock conforms with Belcore GR-1244-CORE wander transfer specifications. 3) A loop bandwidth of 700 Hz and damping factor of 0.7 is typical for video genlock applications. This combination assures minimal Hsync frequency modulation of the pixel clock yet genlocking. 4) Example vendors and part numbers for above capacitor selections: 0.15 μF Panasonic ECP-U1C154MA5 (SMT film type, 1206 size, available from DigiKey) Addr Input Frequency Output Frequency (MHz) N Factor R S CS C B Loop BW (-3dB) Loop Damp Passband Peaking Notes CLK1 CLK2 011 8 kHz 44.736 22.368 22368 12 k Ω 1 μF 1 nF 390 Hz 2.62 0.17 dB 1

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 7 MK1575-01 REV P 051310 0.68 μF Panasonic ECP-U1C684MA5 (SMT film type, 1206 size, available from DigiKey) 10 μF MuRata GRM42-2X5R106K10 10 nF Panasonic ECH-U1C103JB5 (SMT film type, 805 size, available from DigiKey) 33 nF Panasonic ECH-U1C333JB5 (SMT film type, 1206 size, available from DigiKey) Input-to-Output Skew Induced by Loop Filter Leakage Leakage across the loop filter, due to PCB contamination or poor quality loop filter capacitors, can increase input-to-output clock skew error. Concern regarding input-to-output skew error is usually limited to “zero delay” configurations, where CLK1 or CLK2 is directly connected to FBIN. In sever cases of loop filter leakage, however, output clock jitter can also be increased. The capacitors C S and CP in the external loop filter maintain the VCO frequency control voltage between charge pump pulses, which by design coincide with phase detector events. VCO frequency or phase adjustments are made by these charge pump pulses, pumping current into (or out of) the external loop filter capacitors to adjust the VCO control voltage as needed. Like the capacitors, the CHGP pin (pin is a high-impedance PLL node; the charge pump is a current source, which is high impedance by definition, and the VCO input is also high impedance. During normal (locked) operation, in the event of current leakage in the loop filter, the charge pump will need to deliver equal and opposite charge in the form of longer charge pump pulses. The increased length of the charge pump pulse will be translated directly to increased input-to-output clock skew. This can also result in higher output jitter due to higher reference clock feedthrough (where the reference clock is f REFIN), depending on the loop filter attenuation characterisitcs. The Input-to-Output skew parameters in the DC Electrical Specifications assume minimal loop filter leakage. Additional skew due to loop filter leakage may be calculated as follows: Avoiding PLL Lockup In some applications, the MK1575-01 VCO can “lock up” at it’s maximum operating frequency. To avoid this problem observe the following rules: Do not open the clock feedback path with the MK1575-01 e nabled. If the MK1575-01 is enabled and does not get a f eedback clock into pin FBIN, the output frequency will be f orced to the maximum value by the PLL. If an external divider is in the feedback path and it has a delay before becoming active, hold the OE pin high until the divider is ready to work. This could occur, for example, if the divider is implemented in a FPGA. Holding OE high powers down the MK1575-01 and dumps the charge off the loop filter. If an external divider is used in the feedback path, use a circuit that can operate well beyond the intended output cloc k frequency. Power Supply Considerations As with any integrated clock device, the MK1575-01 has a special set of power supply requirements:

  • The feed from the system power supply must be filtered for noise that can cause output clock jitter. Power supp ly noise sources include the system switching power supply or other system components. The noise can interfere with device PLL components such as the VCO or phase det ector.
  • Each VDD pin must be decoupled individually to prevent power supply noise generated by one device circuit bloc k fr om interfering with another circuit block.
  • Clock noise from device VDD pins must not get onto the PCB power plane or system EMI problems may result. Leakage Induced I/O Skew (sec) ILeakage

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 8 MK1575-01 REV P 051310 This above set of requirements is served by the circuit illustrated in the Optimum Power Supply Connection, below. The main features of this circuit are as follows:

  • Only one connection is made to the PCB power plane.
  • The capacitors and ferrite chip (or ferrite bead) on the common device supply form a lowp ass ‘pi’ filter that re move noise from the power supply as well as clock n oise back toward the supply. The bulk capacitor should be a tantalum type, 1 μF minimum. The other capacitors should be ceramic type.
  • The power supply traces to the individual VDD pins shou ld fan out at the common supply filter to reduce interaction between the device circuit blocks.
  • The decoupling capacitors at the VDD pins should be ceramic type and should be as close to the VDD pin as possible. There should be no vias between th e de coupling capacitor and the supply pin. Optimum Power Supply Connection Series Termination Resistor Output clock PCB traces over 1 inch should use series termination to maintain clock signal integrity and to reduce EMI. To series terminate a 50Ω trace, which is a commonly used PCB trace impedance, place a 33Ω resistor in series with the clock line as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following printed circuit board layout recommendations should be observed. Each 0. 01µF power supply decoupling capacitor should be mounted as close to the VDD pin as possible. The PCB tr ace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. Distance of the f errite chip and bulk decoupling from the device is less cr itical. 2) T he loop filter components (RZ, CS and CB) must also be pla ced close to the CHGP and VIN pins. CB should be closest to the device. Coupling of noise from other system signal traces should be minimized by keeping traces short and away from active signal traces. Use of vias should be avoided. T o minimize EMI the 33Ω series termination resistor, if ne eded, should be placed close to the clock output. 4) Because e ach input selection pin includes an internal pull-up device, those inputs requiring a logic high state (“1”) can b e left unconnected. The pins requiring a logic low state 0”) can be grounded. Loss of Reference Clock If a loss occurs on the REFIN clock, the output frequency will decrease at a rate of where: C = C1 + C2 VS = value of VS divider (from the table on page 3) If the input is held low, the output will stop high or low, or might toggle at several Hz. Low Frequency Operation The output frequency can be extended below 1.5 MHz by adding a divider in the output path. In this configuration, it is desirable to take the feedback signal from CLK1 rather than the output of the divider. However, if zero delay operation is required, the feedback signal must come from the divider output. Connection Via to 3.3V Power Plane Ferrite Chip 0.1 F BULK 1 nF VDDA Pin 0.01 F VDDD Pin 0.01 F 10Ω df dt 4250 C x VS = Hz/s

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 9 MK1575-01 REV P 051310 MK1575-01 Typical VCO Transfer Curve 100 200 300 400 500 600 700 00 . 511 . 522 . 533 . 5 Vin MHz

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 10 MK1575-01 REV P 051310 Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK1575-01. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Recommended Operation Conditions Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C Item Rating Supply Voltage, VDD 7 V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature (industrial version) -40 to +85 ° C Ambient Operating Temperature (commercial version) 0 to +70 ° C Storage Temperature -65 to +150 ° C Junction Temperature 125 ° C Soldering Temperature 260 ° C Parameter Min. Typ. Max. Units Ambient Operating Temperature (industrial version) -40 +85 ° C Ambient Operating Temperature (commercial version) 0 +70 ° C Power Supply Voltage (measured in respect to GND) +3.15 +3.3 +3.45 V Parameter Symbol Conditions Min. Typ. Max. Units Operating Voltage VDD 3.15 3.3 3.45 V Supply Current IDD Clock outputs unloaded, VDD = 3.3 V 10 mA Supply Current in Power Down I DD OE = VDD 100 μA Charge Pump Current I CP 12.5 μA Input High Voltage V IH 2V Input Low Voltage V IL 0.8 V Input High Current I IH VIH = VDD -10 +10 μA Input Low Current I IL VIL = 0 -10 +10 μA Input Capacitance, except X1 C IN 7p F Output High Voltage (CMOS Level) VOH IOH = -4 mA VDD-0.4 V

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 11 MK1575-01 REV P 051310 Unless stated otherwise, VDD = 3.3V ±5%, Ambient Temperature -40 to +85° C Output High Voltage V OH IOH = -8 mA CLK1, CLK2 2.0 V IOH = -4 mA FCLK 2.0 V Output Low Voltage V OL IOL = 8 mA CLK1, CLK2 0.4 V IOL = 4 mA FCLK 0.4 V Short Circuit Current I OS CLK1, CLK2 ±43 mA FCLK ±18 mA Nominal Output Impedance Z OUT 20 Ω Parameter Symbol Conditions Min. Typ. Max. Units Input Clock Frequency (into pins REFIN or FBIN) fREF 20 MHz Internal VCO Frequency f VCO 96 320 MHz Output Frequency f CLK 80 MHz Output Rise Time t OR 0.8 to 2.0 V .6 1.1 ns Output Fall Time t OF 2.0 to 0.8 V .6 1.1 ns Output Clock Duty Cycle t DC At VDD/2 45 50 55 % Jitter, Absolute Peak-to-peak t J Single cycle measurement; Deviation from mean 150 ps Long Term Timing Jitter, pk-pk t JLT 10 μS trigger delay 1.7 3.0 ns VCO Gain K O 340 MHz/V Parameter Symbol Conditions Min. Typ. Max. Units

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 12 MK1575-01 REV P 051310 Package Outline and Package Dimensions (16-pin TSSOP, 4.40 mm Body, 0.65 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95, MO-153 Marking Diagram (Pb free, industrial) Marking Diagram (Pb free, commercial) Notes: 2. YYWW is the last two digits of the year and the week number that the part was assembled. 3. “L ” designates Pb (lead) free package. 4. “I” designates industrial temperature grade. 5. Bo ttom marking: (origin). Origin = country of origin of not USA. INDEX AREA 1 2 D E1 E SEATING PLANE A AA e - C - b aaa C c L Millimeters Inches Symbol Min Max Min Max A- - 1 . 2 0 - - 0 . 0 4 7 A1 0.05 0.15 0.002 0.006 A2 0.80 1.05 0.032 0.041 b 0.19 0.30 0.007 0.012 C 0.09 0.20 0.0035 0.008 D 4.90 5.1 0.193 0.201 E 6.40 BASIC 0.252 BASIC E1 4.30 4.50 0.169 0.177 e 0.65 Basic 0.0256 Basic L 0.45 0.75 0.018 0.030 α 0° 8° 0° 8° 1 8 916 15751GIL YYWW 1 8 916 157501GL YYWW 1 8 916 157501GL YYWW

CLOCK RECOVERY PLL CLOCK SYNTHESIZER IDT™ CLOCK RECOVERY PLL 13 MK1575-01 REV P 051310

Ordering Information

"LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. Part / Order Number Marking Shipping Packaging Package Temperature MK1575-01GLF see Marking Diagrams above Tubes 16-pin TSSOP 0 to + 70 ° C MK1575-01GLFTR Tape and Reel 16-pin TSSOP 0 to + 70 ° C MK1575-01GILF Tubes 16-pin TSSOP -40 to + 85 ° C MK1575-01GILFTR Tape and Reel 16-pin TSSOP -40 to + 85 ° C

© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names a nd marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA Corporate Headquarters Integrated Device Technology, Inc. www.idt.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 For Tech Support www.idt.com/go/clockhelp Innovate with IDT and accelerate your future networks. Contact: www.IDT.com MK1575-01 CLOCK RECOVERY PLL CLOCK SYNTHESIZER

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