Sampling peak detector has shutdown feature


Posted on Oct 11, 2012

You face a serious problem in using a slow ADC with a fast peak detector. The circuit in Figure 1 allows a slow ADC to measure a fast, sampled signal peak. The 100-MHz peak detector for ultrasonic-pulse sampling uses a fast MAX4231 amplifier from Maxim (www.maxim-ic.com). This amplifier has a shutdown feature that facilitates power savings without losing the sampled information. When the circuit samples a peak with a low-TTL-control input, the output of the peak-detector amplifier shuts off, and the output amplifier switches on to measure the output signal.






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