ABB DSTC452 MODEM FIELDBUS 5751017-A

ABB DSTC452 MODEM FIELDBUS 5751017-A Description:

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ABB DSTC452  MODEM FIELDBUS 5751017-A

ABB DSTC452  MODEM FIELDBUS 5751017-A

ABB DSTC452  MODEM FIELDBUS 5751017-A

The resistor ratios of R2/R1 and R2*/R1* must be well matched to obtain an acceptable CMRRDIFF. However, the tight tolerance resistors will add more cost to this circuit. The DC CMRRDIFF is shown in Equation 1. EQUATION 1: Example 1 • If R2/R1 = 1 and TR = 0.1%, then the worst case DC CMRRDIFF will be 54 dB. • If R2/R1 = 1 and TR = 1%, then the worst case DC CMRRDIFF will be only 34 dB. Moreover, RSEN should be much less than R1 and R2 in order to minimize resistive loading effect. The Difference amplifier’s input impedances, seen from V1 and V2, are unbalanced. Note that the resistive loading effect and the unbalanced input impedances will degrade the CMRRDIFF. The reference voltage (VREF) allows the amplifier’s output to be shifted to some higher voltage, with respect to ground. VREF must be supplied by a lowimpedance source, to avoid making CMRRDIFF worse. In addition, as shown in Figure 3, the input voltages (V1, V2) can be represented by Common mode input voltage (VCM) and Difference mode input voltage (VDM): • V1 = VCM + VDM/2 and V2 = VCM + VDM/2 • VOUT = (V1 – V2)×G+VREF = VDM ×G+VREF, where G = R2/R1 In order to prevent VOUT from saturating supply rails, it must be kept within the allowed VOUT range between VOL to VOH. The VCM range of the Difference amplifier has been increased due to the resistor dividers made by R1, R2, R1* and R2*. In brief, the VDM and VCM of the Difference amplifier must meet the requirements shown in Equation 2: EQUATION 2: Example 2 Refer to Figure 3 and assume that VDD = 16V, VSS = GND, VREF = GND, R2/R1 = 1, and the voltage drop across RSEN is 200 mV. Thus, according to the MCP6H01 data sheet (DS22243), it is VCMRH = VDD– 2.3V =13.7V, VCMRL =VSS–0.3V = -0.3V. Based on Equation 2, the acceptable VCM of the Difference amplifier is from -0.5V to 27.3V. The advantages and disadvantages of Difference amplifiers include: a) Advantages: - Reasonable Common mode rejection ratio (CMRRDIFF) - Wide Common mode input voltage range - Low-power consumption, low cost and simplicity b) Disadvantages: - Resistive loading effect - Unbalanced input impedances - Adjust the Difference amplifier’s gain by changing more than one resistor value CMRRDIFF 20 1 R2 R1 + ----- K ----------------            log Where: TR = Resistor Tolerance K = Net Matching Tolerance of R2/R1 to R2*/R1* CMRRDIFF (dB) = Common Mode Rejection Ratio of Difference Amplifier 

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1771-DBMEM2 1771-ES
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