Low Pass Filter for AD8367 set up
The SXLP-13+ Low Pass filter from mini-circuits works exceedingly well for Laserdisc and VHS RF capture (it is not sufficient for MUSE LD capture). It's a nice little box with a shield housing already on it. PIN 1 is annotated by a small triangle in one corner of the bottom PCB.
If you wish to skip this, the BLP-10.7+ also works very well. It costs more, and has a lower cut-off, but does work well (it is still < 3db attenuation @ 14mhz).
NOTE: the triangle itself is ground / shield. It is the pad adjacent to the triangle that is PIN #1. Do not solder your signal wire to the triangle (ask me how i found this out!).
Pin #1 and Pin #8 are the signal path pins, the rest are all ground (review the datasheet for clarification). I'm not going to do step by step instructions here, as it is pretty straightforward. Connect PIN #1 and PIN #8 to the center of your connectors / cables with a 47-51 ohm resistor in series. Annotate which end has the resistor, it makes a difference in the filter performance.
On the previous pages i mentioned a high gain setup achieved by not including a resistor in the filter at all (as shown below in the cable filter setup), and instead using a 220 ohm resistor for termination. This increases the gain the CX ADC sees though, and on some of my discs, it had me all the way at 0 with no room to go down. Because there are possibly discs that register higher than the ones i have, it is possible you could end up with a situation where you couldn't get the gain low enough without an attenuator.
In this first setup, i use a simple project box and BNC panel mount connectors:
An alternate way, is to cut a BNC/SMA cable in half, and solder the cut ends to the filter inside a project box or something else. Make sure you use the zip ties tight to keep the cable pulling on the filter, and pulling off the pads of the filter. NOTE: in this picture the resistor is absent, but for AD8367 operation, you need it, just like the box lpf above. This picture is just an example:
