www.ti.com
Setup
5
SNAU217A – August 2017 – Revised November 2017
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
LMX2572EVM Evaluation Instructions
Figure 3. Default Mode
2.7
EVM Strap Options
2.7.1
MUXout_SW
There are two switches in MUXout_SW. Switch 1 is used for register readback. Switch 2 is used to
provide a visual PLL lock status through the LED D1. By default, both switches are in the Make position.
To read back register in TICS Pro, set Switch 2 to the Break position.
Figure 4. MUXout_SW Switch
3
Typical Measurement
3.1
Default Configuration
3.1.1
Loop Filter
The parameters for the loop filter are:
Table 1. Loop Filter Configuration
PARAMETER
VALUE
VCO frequency
Designed for 6 GHz, but works
over the whole frequency range
VCO gain
66 MHz/V
Effective charge pump gain
2500 µA
Phase detector frequency
100 MHz
Loop bandwidth
115 kHz
Phase margin
48 degrees
C1_LF, C3_LF
Open
C2_LF
15 nF
C4_LF
2.2 nF
R2_LF
330
Ω
R3_LF, R4_LF
0
Ω
