Datasheet LTC1283 (Analog Devices) - 9

LTC1283
O U U W U APPLICATI S I FOR ATIO Multiplexer (MUX) Address
The first four bits of the input word assign the MUX (SGL/DIFF = 0) measurements are limited to four adjacent configuration for the requested conversion. For a given input pairs with either polarity. In single-ended mode, all channel selection, the converter will measure the voltage input channels are measured with respect to COM. Figure between the two channels indicted by the + and – signs in 1 shows some examples of multiplexer assignments. the selected row of Table 1. Note that in differential mode
Table 1. Multiplexer Channel Selection MUX ADDRESS DIFFERENTIAL CHANNEL SELECTION MUX ADDRESS SINGLE-ENDED CHANNEL SELECTION SGL/ 0DD/ SELECT SGL/ 0DD/ SELECT DIFF SIGN 1 0 0 1 2 3 4 5 6 7 DIFF SIGN 1 0 0 1 2 3 4 5 6 7 COM
0 0 0 0 + – 1 0 0 0 + – 0 0 0 1 + – 1 0 0 1 + – 0 0 1 0 + – 1 0 1 0 + – 0 0 1 1 + – 1 0 1 1 + – 0 1 0 0 – + 1 1 0 0 + – 0 1 0 1 – + 1 1 0 1 + – 0 1 1 0 – + 1 1 1 0 + – 0 1 1 1 – + 1 1 1 1 + –
4 Differential 8 Single-Ended Combinations of Differential and Single-Ended
CHANNEL CHANNEL CHANNEL + (–) 0 + + 0,1 { – 0,1 { (+) 1 + – 2 + + (–) 3 – 2,3 + { – 2,3 { (+) + 4 + 5 + + 4 + (–) 4,5 { 6 + – (+) 5 + 7 + 6 + + (–) 7 + 6,7 { – (+) COM (–) COM (–)
Changing the MUX Assignment “On the Fly”
+ – 4,5 5,4 { – { + + 6 + 6,7 { – { 7 + COM (UNUSED) COM (–) LTC1283 • F01 1ST CONVERSION 2ND CONVERSION
Figure 1. Examples of Multiplexer Options on the LTC1283
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