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Sorry, i don't understand why a pull-up resistor is involved in your level translation circuit. If so, there may be a problem of the resistance value. I made a clear suggestion, but I don't know, which circuit you actually implemented. You may want to show a schematic.
Apart from level translator circuit details, there may be a problem of inadequate wiring.
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Hi, thanks again for your reply.
While waiting to the HCT, i tried another translator, it work but no up to 1MHz, it is only up to 2ooKHz for the squrewave without turning into sawtooth wave. The HCT f my order haven't reach me yet:mad:
http://rapidshare.com/files/371907323/sn7407.pdf.html May you refer to the the pdf above, page 4 the 1st circuit connection? I constructed according to this but i didn't put the capacitor as i don't need a filter.Thus, i only use the pull up resistor. The Vcc is 5V.
Then there is no problem after output of translator is fine. Problem occurred when i connected to ADC( i supply 2 control signals).The waveform distorted when i combine this translator and ADC.
Please refer to :
http://rapidshare.com/files/371894736/upload.rar.html I doubt if it is the internal structure of ADC that makes the waveform distorted when 2 signals are transferred. No distortion if only 1 connection is made between ADC and translator but there will be if more than 1 lines are connected.
One more thing, can you let me know about the Vih?
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