LMX2595EVM

EVAL BOARD FOR LMX2595

This Evaluation Module is for the LMX2595, which is the first PLL with integrated VCO in industry to get fundamental VCO output up to 20 GHz. The industry leading PLL FOM is –236 dBc/Hz with 1/f of –129 dBc/Hz. This device supports the JESD204B standard (as in the LMX2595 can generate or repeat the SYSREF signal), and is designed for clock high-speed data converters. The integrated jitter from the EVM measurements is less than 50 fs at 9-GHz carrier frequency. By providing a SYNC signal, the user can synchronize the output phase across multiple LMX2595 devices. The LMX2595 can also generate a frequency ramp as demonstrated in this evaluation module. With an on-board oscillator, the setup process only requires a 3.3-V power supply and an included Reference Pro module (For SPI Programming interface). The software is simple with an intuitive and user-friendly GUI.

Trademarks

PLLATINUM is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

1 Evaluation Board Setup

1. Power:

a. Set power supply to 3.3 V with 600-mA current limit and connect to VCC SMA.

2. Input Signal:

a. Connect a clean 100-MHz clock source to the OSCinP SMA.

3. Programming Interface:

• Reference Pro will provide SPI interface to program LMX2595.

a. Connect USB cable from laptop or PC to USB port in Reference Pro. This provides power to Reference Pro Board and communication with TICS GUI.

b. b. Connect 10-pin ribbon cable from Reference Pro to LMX2595EVM as shown above.

4.Output:

a. Connect RFoutAM or RFoutAP to a phase noise analyzer. Connect a 50-Ω resistor on the unused pin if you are using a single-ended output. Use a balun if you are using a differential output.

2 EVM Description

The LMX2595 is populated on a 4-layer PCB. This brief description should help you use the EVM: