Hi A more ideal solution for the 5680 might be a little board with a 5V regulator on it, and the 1 pps buffering. Hang it on the existing 9 pin connector and have another (properly configured) 9 pin on the board for RS-232 com.
Pretty small board, pretty cheap parts. If you wanted the full blown version, drop an LED on the lock output. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Sent: Tuesday, January 10, 2012 10:19 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A? On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths <[email protected]> wrote: >Hal Murray wrote: >> >> The TADD-3 uses 3 AC drivers in parallel, each going through a 51 ohm resistor. Changing those resistors to 150 ohms should work. Maybe a bit lower to account for the impedance in the drivers. I'd probably check it with a scope. >> >That approach doesn't do anything for the Vcc and GND bounce exhibited >by the driver chip. >GND and Vcc bounce is the cause of the high frequency ringing exhibited >by the TADD-3 outputs. >This ringing can even be observed at the outputs of inverters whose >inputs are tied low or high in the same package > >Damping the crossover current induced transient in the supply leads >(bondwire and lead frame) inductance is one way to minimise this. >A small resistor in series with the Vcc pin often works well, the >resistor value being chosen for near critical damping. > >Another problem with the TADD-3 is the sharing of a driver chip by >different input frequencies which leads to intermodulation between the 2 >outputs. I have never seen that much ground bounce before so assumed it was a termination problem. Was the driver chip decoupling inadequate? That at least would be easy enough to fix. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
