Table of Contents
Advertisement
www.ti.com
7
Using the USB Interface Connection
The on-board MSP430F5529 USB microcontroller (U4) provides an I
slave device. The device registers can be controlled via USB using the GUI platform running on a Host
PC.
8
EVM Quick Start Guide
The following guide allows the user to quickly configure the LMK61E2 to evaluate performance and device
flexibility
•
1. Set the Control Pin jumpers to the default configuration as noted in Table 1Table 3.
•
2. Confirm the EVM Default power configuration is set per Table 2 to power the LMK61E2 in USB
POWER mode using the on-board LDO regulators and power supplied over USB.
•
3. Observe any active output clock on OUTN and OUTP SMA ports.
– 3.1. Default EVM configuration is AC coupled LVPECL as noted in Table 4.
– 3.2. Use 50-ohm coax cables to connect the test equipment to the output SMA ports. If making a
single-ended measurement, terminate the unused SMA port with a 50-ohm load.
– 3.3. Power LEDs, D3 & D5 should be illuminated when the EVM is connected to power
2
– 3.4. I
C activity can be seen on LED D4 (active with activity).
•
4. Refer to Table 5 for recommended device configurations configurable via the GUI.
PARAMETER
PLL
Loop Filter
(1)
Termination schemes should match device settings. See
(2)
Device default
9
Recommended Test Instruments
For making accurate measurements on ultra-low noise/jitter, high-speed clock signals, the following
instruments are recommended:
•
Source Signal Analyzer: Keysight/Agilent E5052 for phase noise/jitter measurements
•
Oscilloscope: Agilent DSA90000A series (or equivalent) for AC measurements and time-domain jitter
analysis with jitter software package
•
Balun: M/A-COM H-183-4 (30-3000 MHz) 180° coupler, or equivalent
SNAU188 – October 2015
Submit Documentation Feedback
Table 5. Recommended Device Configurations
156.25 MHz
Reference Doubler
Enabled
N Divider
50
Fractional Numerator
Fractional Denominator
VCO frequency
5000 MHz
Output Divider
32
Charge Pump Gain
6.4 mA
Loop Filter Order
2nd Order
C1
5 pF
C2
10 nF
C3
0 pF
R2
800 Ω
R3
18 Ω
Modulator Order
Integer Mode
Dithering
Disable
Charge Pump Bleed
None
Copyright © 2015, Texas Instruments Incorporated
Using the USB Interface Connection
2
C host interface to the LMK61E2
(2)
100 MHz
48
4800 MHz
16
Table
4.
(1)
161.1328125 MHz
51
22500
40000
5162.25 MHz
32
2.8 mA
3rd Order
105 pF
35 pF
1.1 kΩ
1.3 kΩ
1st Order
Weak
8.5 kΩ 1 ns
LMK61E2EVM User's Guide
11
Advertisement
Table of Contents
