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ES5106 데이터시트(PDF) 11 Page - Cyrustek corporation |
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ES5106 데이터시트(HTML) 11 Page - Cyrustek corporation |
11 / 20 page ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD 03/05/14 11 System Timing The oscillator frequency is divided by four prior to clocking the internal decade counters. The signal integrate takes a fixed 1000 counts time period which is equal to 4000 clock pulses. The back plane drive signal is derived by dividing clock frequency by 800. To make a maximum rejection of line frequency (60Hz or 50Hz) noise pickup, the signal integrate period should be a multiple of the line frequency period. For 600Hz noise rejection, oscillator frequencies of 120KHz, 80KHz, 60KHz, 48KHz, 40KHz, etc. should be selected. For 50Hz rejection, oscillator frequencies of 100KHz, 50KHz, 40KHz, etc. would be suitable. For all ranges of frequency Rosc should be 100KΩ, Cosc is selected from the approximate equation f=0.45/RC. For 48KHz clock (3readings/second), Cosc=100PF. Integrating Resistor The input buffer amplifier and integrator both have class A output stage with 100μA of quiescent current and can supply 20μA drive currents with negligible linearity errors. The integrating resistor should be chosen to remain in the output stage linear drive region. It should be noticed that the integrating resistor should not be so large such that the leakage currents of printed circuit board will induce errors. For a 200mV full-scale the recommended integrating resistor value is 47KΩ and for 2V full-scale is 470KΩ. |
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