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Many of the delta-sigma Analog-to-Digital converters inBurr-Brown’s product line come in pairs, where one is asingle channel differential input converter and the second isa four channel differential input converter. This is true forthe ADS1210 and ADS1211. The ADS1210 has one differentialinput, where the ADS1211 has four differential inputs(as shown in Figure 1). Another similar pair in the Burr-Brown product line is the ADS1212 (one differential input)and the ADS1213 (four differential inputs). In the case of theADS1211 and ADS1213, the four channel input capability isimplemented internally with a analog multiplexer inputstage followed by a single programmable gain amplifierstage and a second-order modulator. At the end of the signalpath a third-order digital filter is used to refine the accuracyto 23 bits for the ADS1210 and ADS1211 and 19 bits for theADS1212 and ADS1213.
