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Digital pressure signal disposal device MAX1458 bridge excit

2016-05-17 16:12  
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Digital pressure signal disposal device MAX1458 bridge excitation circuit
Digital pressure signal disposal device MAX1458 bridge excitation circuit is shown in figure. Using DAC3's outputcan change sensor incentive current IBR's value, then itwillrealize full range fine calibration. IISRC is benchmark current, and it is set by the voltage of RISRC and pin 9. V1 and V2form mirror current sourcem, current gain is 14 times, and it can make incentive current IBR=14IISRC. IBR's programming rangeis 0.1~2mA. Analog switches S1, S2's hige state is controlled by configuration register. Obviously, when full range output voltage changes, DAC3 will compensate bridge road output voltage by changing BR, and correct full range error. DAC4 is used tocorrect full range temperature coefficient error.