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MX7705 Datasheet(PDF) 19 Page - Maxim Integrated Products

 Part # MX7705 Description 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC Download 34 Pages Scroll/Zoom 100% Manufacturer MAXIM [Maxim Integrated Products] Direct Link https://www.maximintegrated.com/en.html Logo

MX7705 Datasheet(HTML) 19 Page - Maxim Integrated Products

 19 / 34 pageIncreasing the gain increases the resolution of the ADC(LSB size decreases), but reduces the differential inputvoltage range. Calculate 1 LSB in unipolar mode usingthe following equation:where VREF = VREF+ - VREF-.For a gain of one and VREF = 2.5V, the full-scale volt-age in unipolar mode is 2.5V and 1 LSB≈ 38.1µV. For again of four, the full-scale voltage in unipolar mode is0.625V (VREF / GAIN) and 1 LSB≈ 9.5µV. The differen-tial input voltage range in this example reduces from2.5V to 0.625V, and the resolution increases, since theLSB size decreased from 38.1µV to 9.5µV.Calculate 1 LSB in bipolar mode using the followingequation:where VREF = VREF+ - VREF-.Unipolar and Bipolar ModesThe B/U bit in the setup register (Table 9) configuresthe MX7705 for unipolar or bipolar transfer functions.Figures 4 and 5 illustrate the unipolar and bipolar trans-fer functions, respectively.In unipolar mode, the digital output code is straightbinary. When AIN+ = AIN-, the outputs are at zeroscale, which is the lower endpoint of the transfer func-tion. The full-scale endpoint is given by AIN+ - AIN- =VREF / GAIN, where VREF = VREF+ - VREF-.In bipolar mode, the digital output code is in offsetbinary. Positive full scale is given by AIN+ - AIN- =+VREF / GAIN and negative full scale is given by AIN+ -AIN- = -VREF / GAIN. When AIN+ = AIN-, the outputsare at zero scale, which is the midpoint of the bipolartransfer function.When the MX7705 is in buffered mode, the absolute andcommon-mode analog input voltage ranges reduce tobetween (GND + 50mV) and (VDD - 1.5V). The differentialinput voltage range is not affected in buffered mode.165 5362(,)LSBVGAINREF=×165 536(,)LSBVGAINREF=16-Bit, Low-Power, 2-Channel,Sigma-Delta ADC______________________________________________________________________________________19Table 5. Input Sampling Capacitor vs. GainGAININPUT SAMPLING CAPACITOR (CSAMP) (pF)13.7527.54158–1283001230000 0000 0000 00000000 0000 0000 00010000 0000 0000 00100000 0000 0000 0011FULL-SCALE TRANSITION1 LSB =VREF(GAIN) (65,536)65,53565,533DIFFERENTIAL INPUT VOLTAGE (LSB)1111 1111 1111 11011111 1111 1111 11101111 1111 1111 11111111 1111 1111 1100VREF / GAINFigure 4. MX7705 Unipolar Transfer Function1 LSB =VREF(GAIN) (65,536)0+1-10000 0000 0000 00000000 0000 0000 00010000 0000 0000 0010+32,767+32,7651111 1111 1111 11011111 1111 1111 11101111 1111 1111 11111000 0000 0000 00001000 0000 0000 00010111 1111 1111 1111x 2-32,768-32,766DIFFERENTIAL INPUT VOLTAGE (LSB)VREF / GAINVREF / GAINFigure 5. MX7705 Bipolar Transfer Function

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