Greetings,
My planned circuit may use a 4066 analog switch to select feedback resistors in a current follower circuit. The 4066 is powered with +5V, -5V, but the control signals are TTL, referenced to 0 V. I need to translate these control signals into the L = -5V, H > -2.5V signals needed to drive the 4066 inputs.
Funny thing, I designed a ckt to do this very thing back in 1983, but those notes are long gone, as are the manuals I searched for the solution.
I''ve thought of using the big-hammer solution, a quad comparator, to convert the control signals, but there must be elegant way to do it with resistors or something.
Thanks in advance for any assistance, or for a reference to a workable solution.
For what it's worth, I found a bilateral switch that has TTL/CMOS inputs, the Analog Devices ADG1421, but it only comes in pkgs with .025" lead spacing. I'm not ready to risk a whole PCB on hand soldering this sucker, and I can't find prototyping boards for .025" spaced leads either.
Dangerous Bill
My planned circuit may use a 4066 analog switch to select feedback resistors in a current follower circuit. The 4066 is powered with +5V, -5V, but the control signals are TTL, referenced to 0 V. I need to translate these control signals into the L = -5V, H > -2.5V signals needed to drive the 4066 inputs.
Funny thing, I designed a ckt to do this very thing back in 1983, but those notes are long gone, as are the manuals I searched for the solution.
I''ve thought of using the big-hammer solution, a quad comparator, to convert the control signals, but there must be elegant way to do it with resistors or something.
Thanks in advance for any assistance, or for a reference to a workable solution.
For what it's worth, I found a bilateral switch that has TTL/CMOS inputs, the Analog Devices ADG1421, but it only comes in pkgs with .025" lead spacing. I'm not ready to risk a whole PCB on hand soldering this sucker, and I can't find prototyping boards for .025" spaced leads either.
Dangerous Bill