[time-nuts] Modified Extron DA [WAS: Rb video]
Charles Steinmetz
csteinmetz at yandex.com
Fri Aug 9 16:44:05 EDT 2013
Bob wrote:
>The original design with 3x75 ohm outputs would be driving a 50 ohm
>load rather than a 33 1/3 ohm load. That would put it "in spec" for
>the CLC409 as opposed to just out of spec current limit wise.
Right. Analog video generally ranges from 0 to +1 V, so as a
DC-coupled video amp the peak current into 3x75 ohm loads would be
+40/-0 mA. Very comfortably within the capability of a CLC409.
A friend recently brought me another commercial video DA, which I'm
helping him modify for use as a 1/5/10 MHz DA. It uses EL2099 video
drivers, which are specified to provide 440 mA (typical -- 360 mA
minimum) of output current. This part should be able to drive 12 or
more parallel back-terminated 50 ohm loads to +13 dBm, if
desired. (Like the CLC409, the EL2099 is obsolete/NLA.)
Best regards,
Charles
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