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TTL switching between 2 analog signals

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hmalissa

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I'm trying to design a circuit with 2 analog inputs (+/- 10V max. range, output impedance <1Ohm, 10mA max. current) and 1 single analog output, and I need to switch between the inputs using a TTL signal. If TTL = high, then output = input 1, and if TTL = low, then output = input 2. I was considering using 2 switches of a DG211 SPST CMOS analog switch. Would that be the most suitable approach? The frequencies of the analog input signals would be <1kHz, and I need rather high precision.
 

You didn't tell if <1 Ohm is also a specification for the intended circuit output impedance. In this case, the switched must have very low Ron, a buffer amplifier would be probably better.
 
FvM said:
You didn't tell if <1 Ohm is also a specification for the intended circuit output impedance. In this case, the switched must have very low Ron, a buffer amplifier would be probably better.
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Thanks a lot. I was thinking about putting a buffer amp at the output.
 

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