AD frequency range: MHz. Square wave: MHz. AD adopts MHz Active Crystal. The module can output two sine waves and two square. IC AD is an ADI DDS chip which be common used in many DDS projects. This AD DDS module is basic on this ADI AD chip. This module provide. IC AD is an ADI DDS chip which be common used in many DDS projects. This AD DDS module is basic on this ADI AD chip.
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Some kit builders have noted poor output on 10m, which has been resolved by very very slight adjustment of the comparator potentiometer.
Some failed to produce any output at all. Powered by the ubiquitous AD, so it will be easy to find code you will be able to adapt to your own project. Shipping Shipping Methods Delivery Information. All the way clockwise: Call us toll free: For technical support, please open a ticket on Itead Support System. Sign up for price alert. To test the frequency stability, a simple 30m band direct conversion receiver is used, powered from a well-regulated linear power supply.
App Notes Discussion group Shipping information Beware imitations! Features 2 channles square wave output and 2 chanles sine wave output Sine wave: Only registered customers who has bought this product can write reviews. What we are looking for is the absence of short-term instabilities that would show up as easily visible wiggles in this line.
This is more expensive but the modules are evidently of a higher quality. In practice, seconds is sufficient to show any instabilities.
Nooelec – AD 40MHz DDS Function Generator Module
Connect your favorite gear. Turn the potentiometer anti-clockwise “left” carefully, just a little at a time! The description below may help people who need to adjust an AD module for use in an Ultimate3 kit.
Be the first to review this product. Note that for these tests, the U3 PA is actually disconnected. The important pins are broken out aad9850 0. There is therefore no squarewave output from the AD on-chip comparator.
First name is required! AD Function Generator Module. For more information regarding pin functionality please consult the modkle linked to above.
Frequency stability test To test the frequency stability, a simple 30m band direct conversion receiver is used, powered from a well-regulated linear power supply. Additional Info SKU Email to a Friend. Turn the potentiometer clockwise “right” carefully, just a little at a time! Turn the potentiometer anti-clockwise “left” carefully, until a pulse waveform is seen. Note that the adjustment of the comparator threshold described above is carried out at 10, in the 30m band.
The image to the right shows 90 seconds of testing. Please visit our wiki page for more info about this product.
DDS module testing
Guess you like Empty. The duty can be adjust by a adjustable resistor – which change the adjust voltage level of the comparer.
The adjustment is almost correct here, but still slightly too anti-clockwise. Coming Ad980 QSX all-band all-mode transceiver.
Upon switch on of a new AD module of course, there is some warm-up drift of the MHz crystal reference oscillator, which shows as drift of the ARGO line. Write Your Own Review Only registered users can write reviews.