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ADS1192IRSMR Datasheet(PDF) 17 Page - Texas Instruments |
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ADS1192IRSMR Datasheet(HTML) 17 Page - Texas Instruments |
17 / 67 page CM+1/2V REF +1/2V REF - V REF 1/2 Single-EndedInputs t INP CMVoltage CM V - REF 1/2 CM+1/2V REF DifferentialInputs t INP INN CMVoltage CM 1/2V REF - +V REF -VREF Common-ModeVoltage(DifferentialMode)= (INP)+(INN) 2 ,Common-ModeVoltage(Single-EndedMode)= INN. INN=CMVoltage InputRange(DifferentialMode)=(AINP AINN)=2V . - REF Device - V to +1/2 V 1/2 REF REF Common Voltage Single-Ended Input Device V Peak-to-Peak REF V Peak-to-Peak REF Common Voltage Differential Input ADS1191 ADS1192 www.ti.com SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012 ANALOG INPUT The analog input to the ADS1191/2 is fully differential. Assuming PGA = 1, the differential input (INP – INN) can span between –VREF to +VREF. Refer to Table 4 for an explanation of the correlation between the analog input and the digital codes. There are two general methods of driving the analog input of the ADS1191/2: single-ended or differential, as shown in Figure 16 and Figure 17. Note that INP and INN are 180°C out-of-phase in the differential input method. When the input is single-ended, the INN input is held at the common-mode voltage, preferably at mid-supply. The INP input swings around the same common voltage and the peak-to-peak amplitude is the (common-mode + 1/2 VREF) and the (common-mode – 1/2 VREF). When the input is differential, the common-mode is given by (INP + INN)/2. Both the INP and INN inputs swing from (common-mode + 1/2 VREF to common-mode – 1/2 VREF). For optimal performance, it is recommended that the ADS1191/2 be used in a differential configuration. Figure 16. Methods of Driving the ADS1191/2: Single-Ended or Differential Figure 17. Using the ADS1191/2 in the Single-Ended and Differential Input Modes Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: ADS1191 ADS1192 |
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