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NS LMX2306TM Operating Instructions Manual

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LMX2306TM Evaluation Board Operating Instructions

General Description

The LMX2306TM Evaluation Board simplifies the evaluation of the LMX2306TM 550 MHz PLLatinum™ frequency
synthesizer. It enables all performance measurements, with no additional support circuitry. The board consists of a
LMX2306TM device, a VCO module and a loop filter built by discrete components. The SMA flange mount connectors
are provided for external reference input, RF output and the power & grounding connection. A cable assembly is
bundled with the evaluation board for connecting to PC through the parallel printer port. By means of MICROWIRE™
serial port emulation, the Codeloader software included can be run on PC to facilitate the LMX2306 internal register
programming for the evaluation and measurement.

Quick Start

Recommended Test Equipment
•
Spectrum Analyzer
•
Modulation Domain Analyzer
•
DC power supply with adjustable voltage output
•
Ultra low noise 10 MHz Signal Source
PLL Loop Filter Design
The table below summarizes the loop filter that is implemented on the LMX2306TM Evaluation Board. These results are
based on theoretical calculations, not measured results.
Phase Margin
Loop Bandwidth
Lock Time
Kφ
680 pF
L M X 2 3 0 6 T M
PLL LOOP FILTER DESIGN SUMMARY
51.3 deg
4.8 kHz
436 - 465 MHz to 1 kHz
tolerance in 625 µs
VCO
0 Ω
15 KΩ
OPEN
5600 pF
E V A L U A T I O N
B O A R D
Pole Ratio T3 /T1
Spur Gain
@ 50 kHz
Spur Gain
@ 100 kHz
Settings for Operation
KΦ
Comparison
Frequency
VCO Output
Frequency
VCO Supply

Other Information

VCO Used
VCO Gain
VCO Input
Capacitance
1
I N S T R U C T I O N S
0.0 %
47.9 dB
36.1 dB
1 mA (High Gain )
50 kHz
435 - 465 MHz
3 Volts
VARIL LVCO 4279U
20 MHz/Volt
100 pF
10-27-2003

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Summary of Contents for NS LMX2306TM

  • Page 1: General Description

    It enables all performance measurements, with no additional support circuitry. The board consists of a LMX2306TM device, a VCO module and a loop filter built by discrete components. The SMA flange mount connectors are provided for external reference input, RF output and the power & grounding connection. A cable assembly is bundled with the evaluation board for connecting to PC through the parallel printer port.
  • Page 2 L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S Connection and Setup Connect the J2 (RF_OUT) output port to the input of a spectrum analyzer for Phase Noise and Reference Spur measurement or the input of a modulation analyzer for Lock Time measurement.
  • Page 3 L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S LMX2306 Performance Measurement Result – A Typical Example The plot on the left shows the close in phase noise of –83.0 dBc/Hz at an output frequency of 435 MHz.

  • Page 4: Reference Spur Measurement Results

    L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S Reference Spur Measurement Results Measured Spur level of –74.7 dBc at an offset frequency of 50 kHz when the PLL is tuned to 435 MHz.
  • Page 5 L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S Lock Time Measurements This shows the positive frequency switching waveform.
  • Page 6 L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S Appendix A - LMX2306TM Evaluation Board Schematic Diagram 1.0uF 0.01uF Power Options 0.01uF...

  • Page 7: Bottom Layer (As Seen Through The Printed Circuit Board)

    B O A R D I N S T R U C T I O N S Appendix B - LMX2306TM Evaluation Board Layout Top Layer JP1 Pin 1 is in lower left hand corner as shown by dot. This matches red strip on Codeloader Cable.
  • Page 8 E V A L U A T I O N B O A R D I N S T R U C T I O N S Appendix C - LMX2306TM Evaluation Board - Bill of Materials Reference Item Part Number...
  • Page 9 L M X 2 3 0 6 T M E V A L U A T I O N B O A R D I N S T R U C T I O N S Appendix D – How to Setup Codeloader Software Port Setup This allows the user to control, which signals go to which pins on the board.

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