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# Ad9914 SYNC_CLK power problem

Category: Hardware
Software Version: ise14.7

Hi, We are using AD9914 in our board. After power up, we need to see the SYNC_CLK output at the pin 82,we use the the oscilloscope to see it ，whe the temperature is 25℃，its power is 1.8V。whe the temperature is 0℃，its power is 2.2V。Dose the  power of the  SYNC_CLK change with the temperature？I can not see the description  of   power of  SYNC_CLK description in the datasheet。

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• Hi  ,

Moving this thread to Direct Digital Synthesis (DDS).

Upon performing bench test using Tronic and oscilloscope, we’re able to simulate and apply various temperatures to the DUT (AD9914). Temperature variations were 25°C,  0°C, and -40°C. Bench test results show that at 25°C, the amplitude is 1.18V and peak to peak value of 1.374V.

At 0°C, the amplitude is 1.24V with peak to peak voltage of 1.423V. There are minimal differences between the two voltage parameters (amplitude and P-P voltage) at different temperatures. The effects of voltage  in change of temperature is minimal and can be negligible. Thus, the output waveform does not change.

In freezing condition of -40°C, the DUT were able to withstand such conditions and still able to have an output. The amplitude is 1.32V and peak to peak voltage of 1.466V. The output waveform is still the same regardless of temperature variations.

Here is a table and graph for comparison of amplitude in temperature change.

In the table, we noticed that as the temperature decreases, the voltage of the output waveform increases. They are inversely proportional with each other. The changes in voltage over varying temperature is minimal. The graph shows the amplitude and peak to peak voltage graph versus temperature. It doesn’t change that much compared to the difference in temperature.

In the data sheet of AD9914 under Absolute Maximum Rating, the operating temperature range is -40°C to 85°C. Under these conditions, the DUT should work normally and properly.

Note: Operation beyond the maximum operating conditions for extended periods may affect product reliability.

All the best,

Jules

• Hi  ,

Moving this thread to Direct Digital Synthesis (DDS).

Upon performing bench test using Tronic and oscilloscope, we’re able to simulate and apply various temperatures to the DUT (AD9914). Temperature variations were 25°C,  0°C, and -40°C. Bench test results show that at 25°C, the amplitude is 1.18V and peak to peak value of 1.374V.

At 0°C, the amplitude is 1.24V with peak to peak voltage of 1.423V. There are minimal differences between the two voltage parameters (amplitude and P-P voltage) at different temperatures. The effects of voltage  in change of temperature is minimal and can be negligible. Thus, the output waveform does not change.

In freezing condition of -40°C, the DUT were able to withstand such conditions and still able to have an output. The amplitude is 1.32V and peak to peak voltage of 1.466V. The output waveform is still the same regardless of temperature variations.

Here is a table and graph for comparison of amplitude in temperature change.

In the table, we noticed that as the temperature decreases, the voltage of the output waveform increases. They are inversely proportional with each other. The changes in voltage over varying temperature is minimal. The graph shows the amplitude and peak to peak voltage graph versus temperature. It doesn’t change that much compared to the difference in temperature.

In the data sheet of AD9914 under Absolute Maximum Rating, the operating temperature range is -40°C to 85°C. Under these conditions, the DUT should work normally and properly.

Note: Operation beyond the maximum operating conditions for extended periods may affect product reliability.

All the best,

Jules

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