User Guide
USB 3.0 - Ensure no other high bandwidth items such as card readers, capture cards, cameras etc are connected to the bus.
If your system does not have USB 3.0 you may want to pickup an USB 3.1 or 3.2 Gen 2 card, or a ExpressCard to USB 3.0 adapter.
There is 10 dips or 2 pairs of 5 for each ADC channel & amplifier.
1 = Up
0 = Down
This value is relative to the orientation of the label on each physical DIP switch i.e ON will always be at the top position of a DIP.
Important
To capture CVBS RF Ensure SW101 DIP's 1 & 4 are set to ON - this enables AC coupling.
| Colour Key | DIP Switch | Value | Description |
|---|---|---|---|
| Black | Amplifier | ||
| White | ADC | Analogue to Digital Converter | |
| RED | DIP 1 | AC/DC Coupling | Pre-Termination |
| Green | DIP 2 | Bias Adjust | DC Bias manual trim pot adjustment |
| Blue | DIP 1 & 2 | Input Impedance | 50 Ohm or 75 Ohm etc |
| Violate | DIP 1 | AC/DC Coupling | Post-Termination |
| Yellow | DIP 3 / 4 | Gain Control | Negative & Positive Gain Control |
| Pink | DIP 5 | Range | 1vpp or 2vpp input voltage range |
| Orange | DIP 5 | Format | Signed/Unsigned sampling mode |
This uses 2 DIPS all of one and 2 of the other
DIP 1 (4 Pin)
Value 1 Sets Pre-Termination
| Input Termination | Setting | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| AC Coupling | 0XXX | 0 | |||
| DC Coupling | 1XXX | 1 |
0 AC Coupling
1 DC Coupling
Value 2 & 3 (Mirrored 2 & 1) Sets Input Impedance
| Input Impedance Ohm | Setting | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| 50 Ohm | 10 | 1 | 1 | ||
| 75 Ohm | 00 | 0 | 0 | ||
| 37.5 Ohm | 10 | 1 | 0 | ||
| 30 Ohm | 11 | 1 | 1 |
75Ohm Is standard for Video applications.
50Ohm Is standard for RF applications
Value 4 Sets Post-Termination
| Input Termination | Setting | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| AC Coupling | XXX0 | 0 | |||
| DC Coupling | XXX1 | 1 |
0 AC Coupling
1 DC Coupling
DIP 2 (3 Pin)
| Input Impedance Ohm | Setting | 1 | 2 | 3 |
|---|---|---|---|---|
| 50 Ohm | 10 | 1 | 1 | 0 |
| 75 Ohm | 00 | 0 | 0 | 0 |
| 37.5 Ohm | 10 | 0 | 1 | 0 |
| 30 Ohm | 11 | 0 | 1 | 1 |
| Zero Adjust Static | XX0 | 0 | ||
| Zero Adjust Trim Pot | XX1 | 1 |
When value 3 of the 3 Pin DIP is in the 1 position the value can be adjusted with the trim pot marked zero adjust.
DIP 5 (2 Pin)
Value 1 Sets Format
Value 2 Sets Range
This DIP assigns input range, and to used Signed or Unsigned sampling
| Input Range Volts | Setting | 1 | 2 |
|---|---|---|---|
| 1Vpp | 0 | 1 | |
| 2Vpp | 1 | 0 | |
| Unsigned | 0 | 0 | |
| Signed | 1 | 1 |
DIP 3 & 4 (3 Pin)
There is 2 input stages and 2 operational amplifiers.
This is controlled by the DIP switches.
There is 2 Gain DIPs for Negative/Positive, you want to mirror the values on both for standard use.
Silkscreen Label Based Positions
| Gain dB | Setting | 2 | 1 | 0 |
|---|---|---|---|---|
| 20 | 0 | 0 | 0 | 0 |
| 13 | 1 | 0 | 0 | 1 |
| 9 | 2 | 0 | 1 | 0 |
| 6 | 3 | 0 | 1 | 1 |
| 3 | 4 | 1 | 0 | 0 |
| 1 | 5 | 1 | 0 | 1 |
| 0 | 6 | 1 | 1 | 0 |
| -1 | 7 | 1 | 1 | 1 |