Troubleshooting - Analog Devices LTC6952 Demo Manual

DEMO MANUAL DC2609A

TROUBLESHOOTING

If the green LEDs (D2, D3, or D4) do not illuminate:
1. Verify J30 measures between 9V and 12V (see the Typi-
cal DC2609A Requirements and Characteristics table)
2. Verify the JP3 and JP5 jumpers are installed correctly
(refer to the DC2609A schematic sheet 3)
3. Verify the output voltages at pin 10 of U7, U8, and U11
are correct
a. U7 = 3.3V
b. U8 = 8V
c. U11 = 5V
If the green LED (D5) does not illuminate:
1. Verify J32 measures between 4V and 6V (see the Typi-
cal DC2609A Requirements and Characteristics)
2. Verify JP4, JP6, and JP7 jumpers are installed correctly
(refer to the DC2609A schematic sheet 3)
3. Verify the voltages at jumper JP6 and JP7 are correct
a. JP6 = 3.3V
b. JP7 = 3.3V
If the red LED (D1) does not illuminate:
1. In LTC6952Wizard's System tab click "Read All".
LTC6952Wizard should match Figure 3. If not, see
"Verify DC2609A and LTC6952Wizard Communication"
Verify DC2609A and LTC6952Wizard Communication:
To verify communication with the DC2609A. The bottom
status line in LTC6952Wizard should read "LTC6952" and
"Comm Enabled" as shown in Figure 3. If not, then per-
form the following steps:
4
1. Ensure the DC2026 is connected to PC
2. Disconnect and Reconnect DC2026 to PC
3. Ensure DC2026 is connected to DC2609A
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 QuikEval™
b. Run QuikEval (Linduino connected to the PC)
If QuikEval does not find a DC590B, reload the DC590
Linduino sketch. To use the LTSketchbook refer to the-
Linduino Design Center
using Linduino.
If DC2609A performance is less than the LTC6952
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 LTC6952 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.
for instructions on how to start
Rev 0