Many of the delta-sigma Analog-to-Digital converters in
Burr-Brown’s product line come in pairs, where one is a
single channel differential input converter and the second is
a four channel differential input converter. This is true for
the ADS1210 and ADS1211. The ADS1210 has one differential
input, 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 the
ADS1211 and ADS1213, the four channel input capability is
implemented internally with a analog multiplexer input
stage followed by a single programmable gain amplifier
stage and a second-order modulator. At the end of the signal
path a third-order digital filter is used to refine the accuracy
to 23 bits for the ADS1210 and ADS1211 and 19 bits for the
ADS1212 and ADS1213.