AD9542 (Rev. 0) - Analog Devices

1 Quad Input, Five-Output, Dual DPLL. Synchronizer and Adaptive Clock Translator Data Sheet AD9542 . FEATURES APPLICATIONS. Dual DPLL synchronizes 2 kHz to 750 MHz physical layer SyncE jitter cleanup and synchronization clocks providing frequency translation with jitter cleaning Optical transport networks (OTN), SDH, and macro and small of noisy references cell base stations Complies with ITU-T and Telcordia GR-253 OTN mapping/demapping with jitter cleaning Supports Telcordia GR-1244, ITU-T , , , Small base station clocking, including baseband and radio , and Stratum 2, Stratum 3e, and Stratum 3 holdover, jitter Continuous frequency monitoring and reference validation cleanup, and phase transient control for frequency deviation as low as 50 ppb JESD204B support for Analog -to-digital converter (ADC)

2 And Both DPLLs feature a 24-bit fractional divider with 24-bit digital-to- Analog converter (DAC) clocking programmable modulus Cable infrastructures Programmable digital loop filter bandwidth: 10 4 Hz to 1850 Hz Carrier Ethernet Automatic and manual holdover and reference switchover, GENERAL DESCRIPTION. providing zero delay, hitless, or phase buildout operation Programmable priority-based reference switching with The 10 clock outputs of the AD9542 are synchronized to any manual, automatic revertive, and automatic nonrevertive one of up to four input references.

3 The digital phase-locked modes supported loops (DPLLs) reduce timing jitter associated with the external 5 pairs of clock output pins with each pair useable as references. The digitally controlled loop and holdover circuitry differential LVDS/HCSL/CML or as 2 single-ended outputs continuously generate a low jitter output signal, even when all (1 Hz to 500 MHz) reference inputs fail. 2 differential or 4 single-ended input references The AD9542 is available in a 48-lead LFCSP (7 mm 7 mm). Crosspoint mux interconnects reference inputs to PLLs package and operates over the 40 C to +85 C temperature Supports embedded (modulated) input/output clock signals range.

4 Fast DPLL locking modes Note that throughout this data sheet, multifunction pins, such Provides internal capability to combine the low phase noise as SDO/M5, are referred to either by the entire pin name or by a of a crystal resonator or crystal oscillator with the frequency stability and accuracy of a TCXO or OCXO. single function of the pin, for example, M5, when only that External EEPROM support for autonomous initialization function is relevant. Single V power supply operation with internal regulation Built in temperature monitor/alarm and temperature compensation for enhanced zero delay performance Rev.

5 0 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 One Technology Way, Box 9106, Norwood, MA 02062-9106, license is granted by implication or otherwise under any patent or patent rights of Analog Devices . Tel: 2017 Analog Devices , Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

6 Technical Support AD9542 Data Sheet TABLE OF CONTENTS. Features .. 1 System Clock PLL .. 29. Applications .. 1 System Clock Input Frequency Declaration .. 29. General Description .. 1 System Clock Source .. 29. Revision History .. 3 2 Frequency Multiplier .. 29. Functional Block Diagram .. 4 Prescale Divider .. 29. 5 Feedback 30. Supply Voltage .. 5 System Clock PLL Output Frequency .. 30. Supply Current .. 5 System Clock PLL Lock 30. Power Dissipation .. 5 System Clock Stability 30. System Clock Inputs, XOA and 6 System Clock Input Termination Recommendations.

7 30. Reference Inputs .. 7 Digital PLL (DPLL) .. 31. Reference Monitors .. 8 Overview .. 31. DPLL Phase Characteristics .. 8 DPLL Phase/Frequency Lock Detectors .. 31. Distribution Clock Outputs .. 9 DPLL Loop 31. Time Duration of Digital Functions .. 10 Applications Information .. 32. Digital PLL (DPLL0, DPLL1) Specifications .. 10 Optical Networking Line Card .. 32. Digital PLL Lock Detection Specifications .. 11 Small Cell Base Station .. 33. Holdover Specifications .. 11 Initialization 34. Analog PLL (APLL0, APLL1) Specifications .. 11 Status and Control Pins.

8 37. Output Channel Divider Specifications .. 11 Multifunction Pins at Reset/Power-Up .. 37. System Clock Compensation Specifications .. 12 Status 38. Temperature Sensor Specifications .. 12 Control Functionality .. 38. Serial Port Specifications .. 12 Interrupt Request (IRQ) .. 43. Logic Input Specifications (RESETB, M0 to M6) .. 14 IRQ Monitor .. 43. Logic Output Specifications (M0 to M6) .. 14 IRQ 43. Jitter Generation (Random Jitter) .. 14 IRQ 43. Phase Noise .. 15 Watchdog Timer .. 45. Absolute Maximum Ratings .. 18 Lock Detectors .. 46.

9 Thermal Resistance .. 18 DPLL Lock Detectors .. 46. ESD Caution .. 18 Phase Step 48. Pin Configuration and Function Descriptions .. 19 Phase Step Limit .. 48. Typical Performance Characteristics .. 21 Skew Adjustment .. 49. Terminology .. 25 EEPROM Usage .. 50. Theory of Operation .. 26 Overview .. 50. 26 EEPROM Controller General Operation .. 50. Reference Input Physical Connections .. 26 EEPROM Instruction Set .. 51. Input/Output Termination Recommendations .. 27 Multidevice 53. System Clock Inputs .. 27 Serial Control Port .. 55. Reference Clock Inputs.

10 27 SPI/I C Port 55. Clock Outputs .. 28 SPI Serial Port Operation .. 55. Rev. 0 | Page 2 of 61. Data Sheet AD9542 . I2C Serial Port Operation ..58 Ordering Guide .. 61. Outline Dimensions ..61. REVISION HISTORY. 9/2017 Revision 0: Initial Version Rev. 0 | Page 3 of 61. AD9542 Data Sheet FUNCTIONAL BLOCK DIAGRAM. AD9542 Q0A. REF OUT0AP. REFA RA TDC. DEMOD. Q0AA OUT0AN. REFAA DPLL0 APLL0. REF RAA. DEMOD TDC. TO Q0B OUT0BP. REFB REF RB TDC DIGITAL DEMOD CROSSPOINT Q0BB OUT0BN. REFBB MUX. REF RBB. DEMOD TDC. TO Q0C. OUT0CP. REFERENCE REFERENCE DPLL1 APLL1 Q0CC.