Troubleshooting Guide - Analog Devices Linear Technology LTC6953 Demo Manual

DEMO MANUAL DC2610A

TROUBLESHOOTING GUIDE

If the red LED (D1) does not illuminate:
1. Ensure LTC6953 input signal is at the LTC6953 IN
2. In LTC6952Wizard's System tab click 'Read All'.
LTC6952Wizard should match Figure 3. If not, see 'Verify
DC2610A and LTC6952Wizard Communication'
Verify DC2610A and LTC6952Wizard Communication:
To verify communication with the DC2610A. The bottom
status line in LTC6952Wizard should read "LTC6953" and
"Comm Enabled" as shown in Figure 3. If not, then per-
form the following steps:
1. Ensure the DC2026 is connected to PC
2. Disconnect and Reconnect DC2026 to PC
3. Ensure DC2026 is connected to DC2610A
4. Close LTC6952Wizard and restart
5. Verify the DC2026 has the DC590B Emulator sketch
loaded by contacting the factory or following these
steps.
a. Download QuickEval™ at
http://www.linear.com/designtools/software/#Data
b. Run QuickEval (Linduino connected to the PC)
4
If QuickEval does not find a DC590B, reload the DC590
Linduino sketch. To use the LTSketchbook refer to the Lin-
–
pin.
duino QuickStart tab at
linduino for instructions on how to start using Linduino.
If DC2610A performance is less than the LTC6953 data
sheet specifications:
1. For unexpected spurious response, verify power sup-
plies are low noise and spurious free power supplies.
Power supplies that are based off a switching regulator
architecture are known to generate spurs on low jitter
clock outputs.
2. For poor phase noise results, verify the phase noise
specifications of the input signal and the phase noise
measurement instrument. Traditional signal sources
and spectrum analyzers have higher phase noise than
the LTC6953 and will degrade measurement results.
To measure phase noise performance it is recom-
mended to use a low jitter oscillator and a signal source
analyzer, such as Keysight's (previously Agilent/HP)
E5052.
3. Contact the factory for further troubleshooting.
http://www.linear.com/solutions/
dc2610af