Analog Devices Hittite HMC764LP6CE User manual

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Table of Contents
1.0 Applicable Products .............................................................. 2
2.0 Introduction ..................................................................... 2
3.0 Evaluation Kit .................................................................... 2
4.0 Evaluation Board Operation ....................................................... 3
4.1 Conguration with On-Board Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.2 Conguration with External Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Conguration with the Different Type of Loop Filters ................................. 6
4.3.1 Passive Loop Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3.2 PassiveDC Loop Filter (default) .................................................... 8
4.3.3 ActiveA Loop Filter .............................................................. 9
4.3.4 ActiveC Loop Filter ............................................................. 10
5.0 Operating Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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1.0 Applicable Products
HMC764LP6CE, HMC765LP6CE, HMC783LP6CE, HMC807LP6CE
2.0 Introduction
This Operating Guide covers the specied family of Hittite fractional PLL with integrated VCO. The rst
portion lists the Evaluation Kit contents. The second portion describes how to operate the evaluation
board.
3.0 Evaluation Kit
The Evaluation Kit contains the following contents:
a. (1) Evaluation Board Part #:
126791-HMC764LP6C or 127270-HMC765LP6C or
127272-HMC783LP6C or 127283-HMC807LP6C
b. (1) CD ROM Part # 121325
c. (1) USB Controller Board # 122046
d. (1) USB Cable # 690-00064-00
e. (1) Control Cable # 595-00199-00
The CD ROM should include the followings les as a minimum:
a. FTDI USB Drivers .zip le
b. VB HMC PLL with Integrated VCO Controller Software
c. PLL Design Software
d. Evaluation Board Schematic
e. Evaluation Board Operating Guide
f. PLL with Integrated VCO Data Sheets
g. PLL with Integrated VCO Operating Guide
h. Recommended PLL Register Set Text File
i. README Installation Guide

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4.0 Evaluation Board Operation
4.1 Conguration with On-Board Crystal Oscillator
The evaluation board of Hittite fractional PLL with integrated VCO should be set up as shown in the Figure
1. It should be noted that very low noise PLL with Integrated VCOs are sensitive to noisy power supplies.
The evaluation board provides on-board regulators to isolate the +5.5V supply from the PLL analog and
digital +3.3V supplies, the PLL Charge Pump +5V supply and the VCO +5V supply. The VCXO is also
regulated separately to +3.3V from the +5.5V external supply.
The very low noise of the PLL with Integrated VCO requires a high quality test instrument to observe the
phase noise or jitter. For this we recommend a signal analyzer such as the Agilent E5052B or equivalent.
A high performance spectrum analyzer can be used as an alternative to the signal analyzer.
Figure 2 highlights the major components and connectors on the PLL with Integrated VCO evaluation
Board.
Figure 1. Typical Setup of PLL with Integrated VCO Evaluation Board

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Figure 2. PLL with Integrated VCO Evaluation Board Major Components

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4.2 Conguration with External Crystal Oscillator
If it is desired to use the evaluation board with an external crystal oscillator, disable the VCXO Regulator
U6 by shorting JP4, and connect the external source to J2 as shown in Figure 3. If the external source
has sufficient drive (see the reference sensitivity plots in datasheets) it is likely not necessary to remove
C34, at the output of the on-board crystal oscillator, otherwise remove C34 from the board. The evaluation
board has been tested with an external 100 MHz sine crystal with C34 in place with no measurable effects,
however an external square wave oscillator may be more sensitive to mismatch caused by C34, hence if
in doubt, remove C34.
Figure 3. Typical Setup of the PLL with Integrated VCO Evaluation Board with External Crystal Oscillator

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4.3 Conguration with the Different Type of Loop Filters
Depending on the user requirements, different type of loop lters can be congured on the evaluation
Board. A general schematic of loop lters is shown in Figure 4. It can be congured into most lter types,
such as Passive, PassiveDC, ActiveA, ActiveC, etc. It should be noted that the default loop lter on the
evaluation board is PassiveDC, and R23 is set to zero ohm, while R27, R28, C65 and L1 are open as
they are optional. These components can be congured for a higher order lter to improve the spur
performance; however, this can lead to loop instability if not be carefully designed.
Figure 4. General Schematic of Loop Filter
Based on the general schematic above, the different type of loop lters can be congured as follows. It
should be noted that the Op-amp is powered by a separate power supply, marked +15V.

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4.3.1 Passive Loop Filter
The Passive loop lter consists of C33, R13, C37, R12 and C61. It can be congured by removing R21,
R22, R25, and leaving JP6 and +15V open.
It should be noted that the maximum VCO tuning voltage of the passive loop lter is limited by the charge
pump power supply, for example, +5V.
Figure 5. Passive Loop Filter

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4.3.2 PassiveDC Loop Filter (default)
The PassiveDC loop lter consists of C33, R13, C37, R3, R4, C64, R21, C61 and Op-amp U5. It can be
congured by removing R12, R25, R26, C63, shorting R22, C62, leaving JP6 open, and powering +15V
on.
It should be noted that when a single positive supply is applied to the Op-amp, the minimum VCO tuning
voltage of the PassiveDC loop lter is limited by the common mode input voltage characteristic and
the gain of the Op-amp. In order to avoid any problem in trying to utilize the VCO tuning voltage lower
than 2V, a small negative supply voltage, for example –1V, should be applied to the negative supply Pin
4 of the Op-amp. Since Pin 4 is grounded on the evaluation board, it is difficult to change but can be
implemented in the customer board design.
Figure 6. PassiveDC Loop Filter