TDA7010 quartz crystal tuned?
时间:04-06
整理:3721RD
点击:
Hello I am looking for a sincle chip minimal component FM receiver for the HF bands and I came out to the TDA7010
http://pdf1.alldatasheet.com/datashe...S/TDA7010.html
Since I interest in a single frequency reception how should I replace the tuning circuit to accept a crystal instead of a coil? (trimmimg a bit the Xtal frequency is desired)
http://pdf1.alldatasheet.com/datashe...S/TDA7010.html
Since I interest in a single frequency reception how should I replace the tuning circuit to accept a crystal instead of a coil? (trimmimg a bit the Xtal frequency is desired)
You can try to remove L1 and Cp and connect the crystal from pin 5 to the ground, and use Cv for fine tuning.
If you use an overtone crystal, the best would to use and external LO (with a JFET for example) and inject its output on pin 5 of TDA7010. Doing this, have to remove L1, Cp, Cs, and Cv, but C4 should be in place.