AD9547/PCBZ

Dual/Quad Input Network Clock Generator/Synchronizer AD9547 Data Sheet FEATURES APPLICATIONS Supports Stratum 2 stability in holdover mode Supports reference switchover with phase build-out Supports hitless reference switchover Automatic/manual holdover and reference switchover 2 pairs of reference input pins, with each pair configurable as a single differential input or as 2 independent singleended inputs Input reference frequencies from 1 kHz to 750 MHz Reference validation and frequency monitoring (1 ppm) Programmable input reference switchover priority 30-bit programmable input reference divider 2 pairs of clock output pins, with each pair configurable as a single differential LVDS/LVPECL output or as 2 singleended CMOS outputs Output frequencies up to 450 MHz 20-bit integer and 10-bit fractional programmable feedback divider Programmable digital loop filter covering loop bandwidths from 0.001 Hz to 100 kHz Optional low noise LC-VCO system clock multiplier Optional crystal resonator for system clock input On-chip EEPROM to store multiple power-up profiles Software controlled power-down 64-lead LFCSP package Network synchronization Cleanup of reference clock jitter SONET/SDH clocks up to OC-192, including FEC Stratum 2 holdover, jitter cleanup, and phase transient control Stratum 3E and Stratum 3 reference clocks Wireless base stations, controllers Cable infrastructure Data communications GENERAL DESCRIPTION The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronized to one of two differential or four single-ended external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The AD9547 continuously generates a clean (low jitter), valid output clock, even when all references fail, by means of digitally controlled loop and holdover circuitry. The AD9547 operates over an industrial temperature range of −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM ANALOG FILTER STABLE SOURCE AD9547 CLOCK MULTIPLIER CLOCK DISTRIBUTION CHANNEL 0 DIVIDER DIGITAL PLL CHANNEL 1 DIVIDER DAC REFERENCE INPUTS AND MONITOR MUX SYNC EEPROM STATUS AND CONTROL PINS 08300-001 SERIAL CONTROL INTERFACE (SPI or I2C) Figure 1. Rev. G Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2009–2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD9547 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Digital Phase-Locked Loop (DPLL) Core............................... 32  Applications ....................................................................................... 1  Direct Digital Synthesizer (DDS) ............................................. 34  General Description ......................................................................... 1  Tuning Word Processing ........................................................... 35  Functional Block Diagram .............................................................. 1  Loop Control State Machine ..................................................... 36  Revision History ............................................................................... 3  System Clock Inputs................................................................... 37  Specifications..................................................................................... 4  SYSCLK PLL Multiplier............................................................. 38  Supply Voltage ............................................................................... 4  Clock Distribution ..................................................................... 39  Supply Current .............................................................................. 4  Status and Control .......................................................................... 44  Power Dissipation ......................................................................... 4  Multifunction Pins (M0 to M7) ............................................... 44  Logic Inputs (M0 to M7, RESET)............................................... 5  IRQ Pin ........................................................................................ 45  Logic Outputs (M0 to M7, IRQ) ................................................ 5  Watchdog Timer ......................................................................... 45  System Clock Inputs (SYSCLKP, SYSCLKN)............................ 5  EEPROM ..................................................................................... 46  Distribution Clock Inputs (CLKINP, CLKINN) ...................... 6  Serial Control Port ......................................................................... 51  Reference Inputs (REFA/REFAA, REFB/REFBB) .................... 7  SPI/I2C Port Selection ................................................................ 51  Reference Monitors ...................................................................... 7  SPI Serial Port Operation .......................................................... 51  Reference Switchover Specifications .......................................... 8  I2C Serial Port Operation .......................................................... 56  Distribution Clock Outputs (OUT0, OUT1) ........................... 8  I/O Programming Registers .......................................................... 59  DAC Output Characteristics (DACOUTP, DACOUTN) ....... 9  Buffered/Active Registers .......................................................... 59  Time Duration of Digital Functions ........................................ 10  Autoclearing Registers ............................................................... 59  Digital PLL .................................................................................. 10  Register Access Restrictions...................................................... 59  Digital PLL Lock Detection ...................................................... 10  Register Map ................................................................................... 60  Holdover Specifications ............................................................. 10  Register Bit Descriptions ............................................................... 70  Serial Port Specifications—SPI Mode ...................................... 11  Serial Port Configuration and Part Identification (Register 0x0000 to Register 0x0005) ...................................... 70  Serial Port Specifications—I C Mode ...................................... 12  2 Jitter Generation ......................................................................... 13  Absolute Maximum Ratings.......................................................... 14  System Clock (SYSCLK) (Register 0x0100 to Register 0x0108).......................................................................... 71  ESD Caution ................................................................................ 14  General Configuration (Register 0x0200 to Register 0x0214).......................................................................... 72  Pin Configuration and Function Descriptions ........................... 15  DPLL Configuration (Register 0x0300 to Register 0x031B) ..... 75  Typical Performance Characteristics ........................................... 18  Input/Output Termination Recommendations .......................... 23  Getting Started ................................................................................ 24  Clock Distribution Output Configuration (Register 0x0400 to Register 0x0417) ......... ........................................................... 77  Power-On Reset .......................................................................... 24  Reference Input Configuration (Register 0x0500 to Register 0x0507) .......................................................................... 79  Initial M0 to M7 Pin Programming ......................................... 24  Profile Registers (Register 0x0600 to Register 0x07FF) ........ 81  Device Register Programming .................................................. 24  Operational Controls (Register 0x0A00 to Register 0x0A10)......................................................................... 90  Theory of Operation ...................................................................... 26  Overview...................................................................................... 26  Reference Clock Inputs .............................................................. 27  Reference Monitors .................................................................... 27  Reference Profiles ....................................................................... 28  Reference Switchover ................................................................. 30  Clock Part Serial ID (Register 0x0C00 to Register 0x0C07) ..... 94  Status Readback (Register 0x0D00 to Register 0x0D19) ...... 95  Nonvolatile Memory (EEPROM) Control (Register 0x0E00 to Register 0x0E03) .................................................................... 97  EEPROM Storage Sequence (Register 0x0E10 to Register 0x0E3F) .......................................................................... 98  Rev. G | Page 2 of 106 Data Sheet AD9547 Applications Information ............................................................ 102 Calculating the Digital Filter Coefficients .............................103 Power Supply Partitions .......................................................... 102 Outline Dimensions ......................................................................106 Thermal Performance.............................................................. 102 Ordering Guide .........................................................................106 REVISION HISTORY 11/14—Rev. F to Rev. G Changes to Figure 3 Caption to Figure 6 Caption ......................18 Changes to Figure 7 Caption, Figure 8 Caption, Figure 10 Caption, and Figure 11 Caption ....................................................19 5/14—Rev. E to Rev. F Changes to Table 21 ........................................................................15 Added Figure 32: Renumbered Sequentially ...............................23 Changes to Frequency Tuning Word History Section ...............36 Added Disabling Accidental Automatic EEPROM Download Section ..............................................................................................48 Changes to Buffered/Active Registers Section ............................59 Changes to Register Map Section, and Opt Column, Table 37 .............................................................................................60 Changes to Table 66 ........................................................................76 12/13—Rev. D to Rev. E Changes to Calculating Digital Filter Coefficients Section .....101 Changes to Calculation of the α Register Values Section ........102 6/13—Rev. C to Rev. D Change to Table 16 ..........................................................................10 Changes to IRQ Pin Section ..........................................................45 Changes to Programming the EEPROM to Include a Clock Part ID Section ................................................................................49 Changes to Bit 0, Table 121 ............................................................89 Changes to Status Readback (Register 0x0D00 to Register 0x0D19) Section ...............................................................93 2/13—Rev. B to Rev. C Change to Pin 38, Description Column, Table 21 ......................16 Added Figure 31, Renumbered Sequentially ...............................23 Changes to Automatic Priority-Based Reference Switchover Section; Added Table 23, Renumbered Sequentially ......................30 Changes to Low Loop Bandwidth Applications Using a TCXO/OCXO Section ....................................................................37 Changes to EEPROM Upload Section and EEPROM Download Section ...........................................................................47 Added Programming the EEPROM to Include a Clock Part ID Section ................................................................................49 Changes to Read Section ................................................................51 Added Figure 54 .............................................................................. 53 Changes to tC Parameter, Description Column, Table 34 .......... 54 Changes to Table 37 ........................................................................ 59 Added User Scratch Pad (Eight Bytes), Address 0x0C00 to Address 0x0C07, Table 37 .............................................................. 66 Changes to Table 40 ........................................................................ 68 Added Clock Part Serial ID (Register 0x0C00 to Register 0x0C07) Section and Table 133 ...................................... 92 Changes to Table 146, Description Column................................ 96 Changes to Table 147, Description Column................................ 97 Added Table 158 and Table 159..................................................... 99 11/10—Rev. A to Rev. B Changes to Pulse Width High, tHIGH Parameter, Table 17 and SCLK to Valid SDIO and SDO, tDV Parameter, Table 17 ............ 11 Changes to Addr 0x0002, Def Column, Table 36 and Addr 0x0003, Def Column, Table 36 ...................................................... 58 Changes to Addr 0x0632, Table 36 ............................................... 61 Changes to Addr 0x0680, Table 36 ............................................... 62 Changes to Addr 0x06B2, Table 36 ............................................... 63 Changes to Address 0x0002, Description, Table 39.................... 67 Changes to Bit 7 and Bit 6, Table 78 ............................................. 78 Changes to Address 0x629 and Address 0x62A, Table 87, and Bit 7 and Bit 6, Table 88 .................................................................. 80 Changes to Address 0x65B and Address 0x65C, Table 97, and Bit 7 and Bit 6, Table 98 .................................................................. 82 Changes to Address 0x6A9 and Address 0x6AA, Table 107 ..... 84 Changes to Bit 7 and Bit 6, Table 108 ........................................... 85 Changes to Address 0x6DB and Address 0x6DC, Table 117 .... 87 9/10—Rev. 0 to Rev. A Change to Frequency Range (CMOS), Single-Ended Operation Parameter, Table 8 ............................................................................. 7 Added Low Loop Bandwidth Applications Using a TCXO/OCXO Section and Choosing the System Clock Oscillator Frequency Section......................................................... 37 Moved System Clock Period Section ............................................ 39 7/09—Revision 0: Initial Version Rev. G | Page 3 of 106 AD9547 Data Sheet SPECIFICATIONS Minimum and maximum values apply for the full range of supply voltage and operating temperature variation. Typical values apply for AVDD3 = DVDD3 = 3.3 V, AVDD = DVDD = 1.8 V, TA = 25°C, IDAC = 20 mA (full scale), unless otherwise noted. SUPPLY VOLTAGE Table 1. Parameter DVDD3 DVDD AVDD3 3.3 V Supply (Typical) 1.8 V Supply (Alternative) AVDD Min 3.135 1.71 3.135 3.135 1.71 1.71 Typ 3.30 1.80 3.30 3.30 1.80 1.80 Max 3.465 1.89 3.465 3.465 1.89 1.89 Unit V V V V V V Test Conditions/Comments Pin 7, Pin 58 Pin 1, Pin 6, Pin 8, Pin 10, Pin 11, Pin 53, Pin 59, Pin 64 Pin 16, Pin 33, Pin 43, Pin 49 Pin 25, Pin 31 Pin 25, Pin 31 Pin 17, Pin 18, Pin 23, Pin 28, Pin 32, Pin 36, Pin 39, Pin 42, Pin 46, Pin 50 SUPPLY CURRENT The test conditions for the maximum supply current are the same as the test conditions for the All Blocks Running section of Table 3. The test conditions for the typical supply current are the same as the test conditions for the Typical Configuration section of Table 3. Table 2. Parameter IDVDD3 IDVDD IAVDD3 3.3 V Supply (Typical) 1.8 V Supply (Alternative) IAVDD Min Typ 1.5 190 52 24 24 135 Max 3 215 70 55 55 150 Unit mA mA mA mA mA mA Test Conditions/Comments Pin 7, Pin 58 Pin 1, Pin 6, Pin 8, Pin 10, Pin 11, Pin 53, Pin 59, Pin 64 Pin 16, Pin 33, Pin 43, Pin 49 Pin 25, Pin 31 Pin 25, Pin 31 Pin 17, Pin 18, Pin 23, Pin 28, Pin 32, Pin 36, Pin 39, Pin 42, Pin 46, Pin 50 Min Typ 800 Max 1100 Unit mW ALL BLOCKS RUNNING 900 1250 mW FULL POWER-DOWN 13 mW −105 mW Test Conditions/Comments fSYSCLK = 20 MHz1; fS = 1 GHz2; fDDS = 122.88 MHz3; one LVPECL clock distribution output running at 122.88 MHz (all others powered down); one input reference running at 100 MHz (all others powered down) fSYSCLK = 20 MHz1; fS = 1 GHz2; fDDS = 399 MHz3; all clock distribution outputs configured as LVPECL at 399 MHz; all input references configured as differential at 100 MHz; fractional-N active (R = 10, S = 39, U = 9, V = 10) Conditions = typical configuration; no external pull-up or pull-down resistors Conditions = typical configuration; table values show the change in power due to the indicated operation fSYSCLK = 1 GHz1; high frequency direct input mode 7 13 mW mW 70 75 65 mW mW mW POWER DISSIPATION Table 3. Parameter TYPICAL CONFIGURATION INCREMENTAL POWER DISSIPATION SYSCLK PLL Off Input Reference On Differential Single-Ended Output Distribution Driver On LVDS LVPECL CMOS 1 2 3 Single 3.3 V CMOS output with a 10 pF load fSYSCLK is the frequency at the SYSCLKP and SYSCLKN pins. fS is the sample rate of the output DAC. fDDS is the output frequency of the DDS. Rev. G | Page 4 of 106 Data Sheet AD9547 LOGIC INPUTS (M0 TO M7, RESET) Table 4. Parameter INPUT VOLTAGE Input High Voltage (VIH) Input Low Voltage (VIL) INPUT CURRENT (IINH, IINL) INPUT CAPACITANCE (CIN) Min Typ Max Unit 0.8 ±200 V V µA pF Max Unit Test Conditions/Comments 0.4 V V 1 1 µA µA IOH = 1 mA IOL = 1 mA Open-drain mode VOH = 3.3 V VOL = 0 V Max Unit 1000 MHz V/µs % V mV p-p 2.1 ±80 3 Test Conditions/Comments LOGIC OUTPUTS (M0 TO M7, IRQ) Table 5. Parameter OUTPUT VOLTAGE Output High Voltage (VOH) Output Low Voltage (VOL) IRQ LEAKAGE CURRENT Active Low Output Mode Active High Output Mode Min Typ 2.7 SYSTEM CLOCK INPUTS (SYSCLKP, SYSCLKN) Table 6. Parameter SYSTEM CLOCK PLL BYPASSED Input Frequency Range Minimum Input Slew Rate Duty Cycle Common-Mode Voltage Differential Input Voltage Sensitivity Input Capacitance Input Resistance SYSTEM CLOCK PLL ENABLED PLL Output Frequency Range Phase Frequency Detector (PFD) Rate Frequency Multiplication Range VCO Gain High Frequency Path Input Frequency Range Minimum Input Slew Rate Frequency Divider Range Common-Mode Voltage Differential Input Voltage Sensitivity Input Capacitance Input Resistance Min Typ 500 1000 40 60 1.2 100 2 2.5 900 pF kΩ 1000 150 255 6 70 100.1 200 1 Minimum limit imposed for jitter performance Internally generated Minimum voltage across pins is required to ensure switching between logic states; the instantaneous voltage on either pin must not exceed the supply rails; ac ground the unused input to accommodate single-ended operation Single-ended, each pin MHz MHz Assumes valid system clock and PFD rates MHz/V 500 MHz V/µs 8 1 V mV p-p 3 2.5 pF kΩ 100 Test Conditions/Comments Rev. G | Page 5 of 106 Minimum limit imposed for jitter performance Binary steps (M = 1, 2, 4, 8) Internally generated This is the minimum voltage required across the pins to ensure switching between logic states; the instantaneous voltage on either pin must not exceed the supply rails; ac ground the unused input to accommodate single-ended operation Single-ended, each pin AD9547 Parameter Low Frequency Path Input Frequency Range Minimum Input Slew Rate Common-Mode Voltage Differential Input Voltage Sensitivity Input Capacitance Input Resistance Crystal Resonator Path Crystal Resonator Frequency Range Maximum Crystal Motional Resistance Data Sheet Min Typ 3.5 50 Max Unit 100 MHz V/µs V mV p-p 1.2 100 3 4 pF kΩ 10 Test Conditions/Comments Minimum limit imposed for jitter performance Internally generated This is the minimum voltage required across the pins to ensure switching between logic states; the instantaneous voltage on either pin must not exceed the supply rails; ac ground the unused input to accommodate single-ended operation Single-ended, each pin 50 100 MHz Ω Fundamental mode, AT cut See the System Clock Inputs section for recommendations Max 500 Test Conditions/Comments DISTRIBUTION CLOCK INPUTS (CLKINP, CLKINN) Table 7. Parameter INPUT FREQUENCY RANGE MINIMUM SLEW RATE COMMON-MODE VOLTAGE DIFFERENTIAL INPUT VOLTAGE SENSITIVITY Min 62.5 75 100 Unit MHz V/µs mV mV p-p DIFFERENTIAL INPUT POWER SENSITIVITY −15 dBm INPUT CAPACITANCE INPUT RESISTANCE Typ 700 3 5 pF kΩ Rev. G | Page 6 of 106 Minimum limit imposed for jitter performance Internally generated Capacitive coupling required; ac ground the unused input to accommodate single-ended operation; the instantaneous voltage on either pin must not exceed the supply rails Same as voltage sensitivity but specified as power into a 50 Ω load Each pin has a 2.5 kΩ internal dc bias resistance Data Sheet AD9547 REFERENCE INPUTS (REFA/REFAA, REFB/REFBB) Table 8. Parameter DIFFERENTIAL OPERATION Frequency Range Sinusoidal Input LVPECL Input LVDS Input Minimum Input Slew Rate Common-Mode Input Voltage Differential Input Voltage Sensitivity Input Resistance Input Capacitance Minimum Pulse Width High Minimum Pulse Width Low SINGLE-ENDED OPERATION Frequency Range (CMOS) Minimum Input Slew Rate Input Voltage High (VIH) 1.2 V to 1.5 V Threshold Setting 1.8 V to 2.5 V Threshold Setting 3.0 V to 3.3 V Threshold Setting Input Voltage Low (VIL) 1.2 V to 1.5 V Threshold Setting 1.8 V to 2.5 V Threshold Setting 3.0 V to 3.3 V Threshold Setting Input Resistance Input Capacitance Minimum Pulse Width High Minimum Pulse Width Low Min Typ 10 0.001 0.001 40 Max Unit 750 750 750 MHz MHz MHz V/µs V mV 2 ±65 25 3 Minimum limit imposed for jitter performance Internally generated This is the minimum voltage required across the pins to ensure switching between logic states; the instantaneous voltage on either pin must not exceed the supply rails kΩ pF ps ps 620 620 0.001 40 Test Conditions/Comments 250 0.9 1.2 1.9 MHz V/µs Minimum limit imposed for jitter performance V V V 0.27 0.5 1.0 V V V kΩ pF ns ns Max Unit Test Conditions/Comments 9.54 × 10 1.2 0.1 NPDP Δf/fREF NPDP = nominal phase detector period (NPDP = fREF/R)1 Programmable (lower bound subject to quality of SYSCLK) 0.001 0.001 65.535 65.535 sec sec Programmable in 1 ms increments Programmable in 1 ms increments 45 3 1.5 1.5 REFERENCE MONITORS Table 9. Parameter REFERENCE MONITOR Loss of Reference Detection Time Frequency Out-of-Range Limits TIMERS Validation Timer Redetect Timer 1 Min Typ −7 fREF is the frequency of the active reference; R is the frequency division factor determined by the R divider. Rev. G | Page 7 of 106 AD9547 Data Sheet REFERENCE SWITCHOVER SPECIFICATIONS Table 10. Parameter MAXIMUM OUTPUT PHASE PERTURBATION (PHASE BUILD-OUT SWITCHOVER) MAXIMUM TIME/TIME SLOPE (HITLESS SWITCHOVER) Min Max 200 Unit ps Test Conditions/Comments Assumes a jitter-free reference; satisfies Telcordia GR-1244-CORE requirements 65,535 ns/sec Minimum/maximum values are programmable upper bounds; a minimum value ensures