Translation Loop, PLL, VCO Module Data Sheet ADF4401A FEATURES FUNCTIONAL BLOCK DIAGRAM RF8P, RF8N RF output frequency range: 62.5 MHz to 8000 MHz VCO frequency range: 4 GHz to 8 GHz 9 fs rms jitter at 8 GHz output 1, 2, 4, 8, 17 dBm IF output power at 6 GHz RF output 16, 32, 64 90 dBc LO IN to RF output MIXER 90 dBc spurious-free dynamic range VTUNE RF LO LO IN AMP Low phase noise, voltage controlled oscillator HPF Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output IF 3.3 V analog, digital, and mixer power supplies 5 V amplifier and VCO power supply VCO CPOUT CALIBRATION RF output mute function LPF 18.00 mm 18.00 mm, 80-terminal LGA CAV REFP, REFN AMP Supported in the ADIsimPLL design tool APPLICATIONS LPF ADF4401A IFOUT Instrumentation and measurement Automated test equipment Figure 1. Aerospace and defense GENERAL DESCRIPTION The ADF4401A is a fully integrated, system in package (SiP) The ADF4401A implements an integrated downconversion translation loop (also known as an offset loop) module that mixing stage in the feedback loop that sets the loop gain to 1 includes a voltage controlled oscillator (VCO) and calibration and minimizes the in band phase noise. By combining the phase-locked loop (PLL) circuit. Designed for highly jitter frequency downconversion stage and low noise, integrated, sensitive applications, this solution reduces board space and wideband, VCO technology from Analog Devices, Inc., the complexity compared to traditional discrete translation loop ADF4401A offers a wideband jitter performance of 9 fs rms at solutions designed on a printed circuit board (PCB). The time 8 GHz output. The output jitter performance is largely dependent on the performance of the external offset LO. to market is significantly reduced by taking advantage of this highly integrated solution with in package circuitry and The ADF4401A module uses an internal PFD and VCO enhanced isolation that attenuates spurious components. The calibration circuitry to select the appropriate VCO band. The ADF4401A provides a frequency synthesis solution for user can disable the calibration circuitry and close the loop engineers designing highly competitive systems. using the external PFD. All on-chip registers are controlled via The ADF4401A requires an external phase detector or phase a serial port interface (SPI). frequency detector (PFD) and an external local oscillator (LO) to form a frequency synthesis solution. Rev. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. Tel: 781.329.4700 2020 Analog Devices, Inc. All rights reserved. No license is granted by implication or otherwise under any patent or patent rights of Analog Technical Support www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. 25577-001ADF4401A Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 MUXOUT and VCO Calibration Lock Detect ...................... 15 Applications ...................................................................................... 1 Double Buffers ............................................................................ 16 Functional Block Diagram .............................................................. 1 VCO ............................................................................................. 16 General Description ......................................................................... 1 Output Stage ............................................................................... 16 Revision History ............................................................................... 2 SPI ................................................................................................ 16 Specifications .................................................................................... 3 Applications Information ............................................................. 18 Timing Characteristics ................................................................ 6 Device Setup ................................................................................ 18 Absolute Maximum Ratings ........................................................... 7 VCO Calibration, a Worked Example .................................... 19 Thermal Resistance ...................................................................... 7 VCO Calibration Time .............................................................. 20 Electrostatic Discharge (ESD) Ratings ...................................... 7 Local Oscillator (LO IN) .......................................................... 20 ESD Caution.................................................................................. 7 External Phase Detector ............................................................ 21 Pin Configuration and Function Descriptions ............................ 8 Phase Detector Reference ......................................................... 21 Typical Performance Characteristics ........................................... 10 Power Supplies ........................................................................... 21 Theory of Operation ...................................................................... 13 PCB Design Guidelines ............................................................. 21 Circuit Description ......................................................................... 14 Output Matching........................................................................ 21 RF Amplifier ............................................................................... 14 Register Summary .......................................................................... 22 Downconversion Mixer ............................................................. 14 Register Details ............................................................................... 23 IF Amplifier ................................................................................. 14 Outline Dimensions ....................................................................... 39 Calibration Reference Input ..................................................... 14 Ordering Guide .......................................................................... 39 RF N Divider ............................................................................... 14 PFD and Charge Pump.............................................................. 15 REVISION HISTORY 12/2020Revision 0: Initial Version Rev. 0 Page 2 of 39