LMX25121065EVAL/NOPB National Semiconductor, LMX25121065EVAL/NOPB Datasheet - Page 3

• Manufacturer Part Number: LMX25121065EVAL/NOPB
• Description: EVALUATION BOARD FOR LMX25121065
• Manufacturer: National Semiconductor
• Series: PLLatinum™r

Specifications of LMX25121065EVAL/NOPB

• Main Purpose: Timing, Frequency Synthesizer
• Embedded: No
• Utilized Ic / Part: LMX2512
• Primary Attributes: Single Fractional-N and Integer-N PLL with VCO
• Secondary Attributes: 1.065GHz, CodeLoader Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LMX25121065EVAL; *LMX25121065EVAL/NOPB; LMX25121065EVAL

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The LMX2512 Evaluation Board simplifies evaluation of the LMX2512 Dual PLL with integrated
RF VCO. The board allows for the evaluation of many RF and IF PLL performance parameters
with various control settings including: phase noise, lock time and spurious. The CodeLoader
software gives the user a simple means of programming the IC’s control registers. The board has
sufficient flexibility to allow the user to place an additional on-board supply regulator and TCXO.
The evaluation board circuitry consists of an LMX2512LQ1065 device, an IF VCO and a discrete
IF loop filter.
(IF_OUT) and RF lock detect (LD) outputs, the reference frequency (OSC_IN) input and the
power (VDD_5V) connection. A MICROWIRE
board for connecting to a PC through the parallel printer port. By means of serial port emulation,
the CodeLoader software facilitates the LMX2512LQ1065 internal register programming for
evaluation and measurement.
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The fully assembled LMX2512 Evaluation Board is factory tested. Follow the instructions below
to set up the hardware platform for the measurement of interest.
2.1.1
2.1.2
LMX2512LQ1065
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1. Connect the RF_OUT or IF_OUT output port to the input of the spectrum analyzer for
2. Connect an RF signal generator or TCXO to the OSC_IN port of the evaluation board.
3. Plug the DB25 connector end of the cable assembly to the parallel port of the PC.
General Description
Setup
Recommended Test Equipment
Spectrum analyzer with operating frequency range > 2 GHz
Modulation domain analyzer
Low noise signal source adjusted to desired reference frequency
DC power supply with adjustable voltage output
Connection and Setup
phase noise and reference spur measurement or to the input of the modulation domain
analyzer for lock time measurement. Connect the unused port to a suitable 50-ohm
termination.
Set the RF frequency to the desired reference frequency, 19.68 MHz for the default case.
Set the RF level to 1 dBm (~0.7 Vpp).
Connect the other end of the cable to the on-board 10 Pin Header (uWire) with the strip
on the cable at the end opposite the end with the uWire label. Refer to Appendix E for
more details. Alternatively, refer to the
Semiconductor’s Wireless Communications website: wireless.national.com.
SMA flange mount connectors provide for the RF VCO (RF_OUT), IF VCO
LMX2512LQ1065 EVALUATION BOARD OPERATING INSTRUCTIONS
February 19, 2003

CodeLoader Operating Instructions
cable assembly is bundled with the evaluation
from National
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