14 Bit A-D Converter with ICL7134B


Posted on Sep 27, 2012

The circuit ICL7134B base is a bipolar input AID converter broadband, using two AM25L03s to form a successive approximation register 14-bit. The comparator is a circuit with two stage amplifier HA2605 front, used to reduce the settling time problems in the pro summing node (see A020). Warning nu11ing offset of this amplifier is needed and if wide temperature range operation is desired, an auto-zero circuit using a lCL7650 is probably desirable (see A053). The clock, using two gates TTL Schmitt trigger operates at a slower pace for the first 8 bits, where the settlement time is more critical than for the last 6 bits.



14 Bit A-D Converter with ICL7134B - image 1
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The line is short-cycle showed little tied at 15, if fewer bits are needed, it can be moved accordingly. The circuit will free run if the HOLD / RUN input low, but stops after performing a conversion if the pin is high at this time. a low pulse will restart it. The exit status indicates whether the device is operating, and the falling edge indicates the availability of new data. Unipolar version can be built by typing the MSB (D13) on a ICL7134U to pin 14 on the first AM25L03, deleting the reference inversion amplifier A4, and attaching to VRFM VRFL. The line is short-cycle showed little tied at 15, if fewer bits are needed, it can be moved accordingly. The circuit will free run if the HOLD / RUN input low, but stops after performing a conversion if the pin is high at this time. a low pulse will restart it. The exit status indicates whether the device is operating, and the falling edge indicates the availability of new data.




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