Texas Instruments MSC1210 - Manual (Page 139)

Input Multiplexer
12-3
Analog-to-Digital Converter
12.2 Input Multiplexer
The MSC1210 multiplexer is more flexible than a typical ADC in that each input
pin can be configured as either a positive or negative input for a given mea-
surement. While other ADC parts often define input pairs, the MSC1210 defi-
nes one pin as the negative input and the other as the positive input, thus pro-
viding complete design freedom in this respect. Any given input pin may serve
as the negative input in one measurement and serve as the positive input in
the next. Further, any combination of pins can be used—there are no prede-
fined input pairs that restrict.
The input multiplexer provides for any combination of differential inputs to be
selected on any of the input channels, as shown in Figure 12−2. For example,
if channel 1 is selected as the positive differential input channel, any other
channel can be selected as the negative differential input channel. With this
method, it is possible to have up to eight fully differential input channels.
Figure 12−2. Input Multiplexer Configuration