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利用HI7188 A D转换器产生一个64通道的多路复用系统
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2009-06-11
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The purpose of this application note is demonstrate the
power and flexibility of the HI7188 to create a differential 64
channel A/D system. The HI7188 will perform all multiplexer
switching control and calibration. This will enable the
designer to perform a high precision 16-bit analog to digital
conversion using one HI7188 sigma delta converter with up
to sixty-four fully differential inputs. The 64 multiplexer channels
are divided into 8 multiplexer blocks, with one block of 8
logical channels active at any given time. The conversion
rate is 240 conversions per second per logical channel for
each of the eight active channels. PGIA gain, unipolar/bipolar
operation or calibration is on a per logical channel basis.
power and flexibility of the HI7188 to create a differential 64
channel A/D system. The HI7188 will perform all multiplexer
switching control and calibration. This will enable the
designer to perform a high precision 16-bit analog to digital
conversion using one HI7188 sigma delta converter with up
to sixty-four fully differential inputs. The 64 multiplexer channels
are divided into 8 multiplexer blocks, with one block of 8
logical channels active at any given time. The conversion
rate is 240 conversions per second per logical channel for
each of the eight active channels. PGIA gain, unipolar/bipolar
operation or calibration is on a per logical channel basis.
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