Dual 8-bit ADCs provide pseudo high resolution

Posted on Feb 10, 2013    10146

By using two 8-bit ADC channels for the same signal, the technique in Figure 1 can accommodate both conditions. One channel, which the controller uses for fast motion, reads the input directly and adds four 0 LSBs for a 12-bit result. The second channel reads the signal amplified by 16 with four 0 MSBs. The amplification gives this channel the resolution necessary for small-error signals while the robot is traveling a nearly straight line.

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