Version 3 (modified by 9 years ago) (diff) | ,
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This gizmo accepts a 10 or 20MHz reference clock and provides two sets of (4) ECL-level differential programmable outputs. The output frequency is set according to the table below.
JP1/JP3 | JP2/JP4 | Mult | Out/10MHz | Out/20MHz |
L | L | 4X | 40MHz | 80MHz |
L | - | 5.3125X | 53.125MHz | N/A |
L | H | 5X | 50MHz | N/A |
- | L | 6.25X | 62.5MHz | N/A |
- | - | 2X | 20MHz | 40MHz |
- | J | 3.125X | 31.25MHz | 62.5MHz |
H | L | 6X | 60MHz | N/A |
H | - | 3X | 30MHz | 60MHz |
H | H | 8X | 80MHz | N/A |
Notes:
The jumper set JP1/JP2 controls the outputs J1-J4. The jumper set JP3/JP4 controls the outputs J5-J8.
"L" or "H" means install a jumper between the middle pin and the upper or lower pin. "-" means do not install any jumper (or "park" the jumper so it doesn't connect any pins).
Both sets of outputs are fed by the common BNC input, which requires a 1-3V peak-to-peak square or sine wave input with approximately 50% duty cycle.
PCB Documentation
The PCB layout was done with ExpressPCB
Here is the specification we were given:
We have the following CAEn units that need either 40 or 50 MHz: WFD (all need 50 MHz driver frequency, I think ECL of some form) DT5730, 500 MHz, desk top 3-102203-4 connector, LVDS/ECL/PECL/LVPECL (100 ohms ac-coupled) DT5720, 250 MHz, desk top (same) V1724, 16 MHz, VME (same) V1720, VME, not sure of frequency (same) TDC (needs 50 MHz driver frequency, I think ECL of some form) V1290N two 3M 3408-5202 Not clear if Ac- or Dc- coupled