2 layer board of 0.92 x 0.61 inches (23.4 x 15.4 mm)
Uploaded:
August 13th 2018
Shared:
September 16th 2018
Total Price:
$2.75
**A revision B that is physically smaller, but functionally identical [here](https://www.oshpark.com/shared_projects/…
A revision B that is physically smaller, but functionally identical here
Idea taken from https://nfggames.com/forum2/index.php?topic=5744.0 but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the DAC to have a proper video signal that doesn’t go black and white and so on.
Parts list:
U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
C1 1uF 0603 SMD capacitor
C2 1uF 0603 SMD capacitor
C3 1uF 0603 SMD capacitor
C4 1uF 0603 SMD capacitor
R1 10K 0603 SMD resistor
R2 10K 0603 SMD resistor
R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
Y1 27MHz crystal ((Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)
Use 0.8mm substrate for a shallow profile.
Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.
**A revision B that is physically smaller, but functionally identical [here](https://www.oshpark.com/shared_projects/…
A revision B that is physically smaller, but functionally identical here
Idea taken from https://nfggames.com/forum2/index.php?topic=5744.0 but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the DAC to have a proper video signal that doesn’t go black and white and so on.
Parts list:
U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
C1 1uF 0603 SMD capacitor
C2 1uF 0603 SMD capacitor
C3 1uF 0603 SMD capacitor
C4 1uF 0603 SMD capacitor
R1 10K 0603 SMD resistor
R2 10K 0603 SMD resistor
R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
Y1 27MHz crystal ((Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)
Use 0.8mm substrate for a shallow profile.
Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.
