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LTC1289BIJ Datasheet(PDF) 10 Page - Linear Technology |
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LTC1289BIJ Datasheet(HTML) 10 Page - Linear Technology |
10 / 28 page 10 LTC1289 1289fb S APPLICATI I FOR ATIO MUX Address The first four bits of the input word assign the MUX configuration for the requested conversion. For a given channel selection, the converter will measure the voltage between the two channels indicated by the + and – signs in the selected row of Table 1. Note that in differential MUX ADDRESS DIFFERENTIAL CHANNEL SELECTION Table 1. Multiplexer Channel Selection MUX ADDRESS SGL/ DIFF SELECT 1 0 ODD SIGN 10 0 0 + – 10 0 1 + – 10 1 0 + – 10 1 1 + – 11 0 0 + – 11 0 1 + – 11 1 0 + – 11 1 1 + – SGL/ DIFF ODD SIGN SELECT 1 0 00 0 0 + – 00 0 1 + – 00 1 0 + – 00 1 1 + – 01 0 0 – + 01 0 1 – + 01 1 0 – + 01 1 1 – + 0 1 23 4 56 7 0 1 2 3 4 5 6 7 COM SINGLE-ENDED CHANNEL SELECTION mode (SGL/DIFF = 0) measurements are limited to four adjacent input pairs with either polarity. In single-ended mode, all input channels are measured with respect to COM. Figure 1. Examples of Multiplexer Options on the LTC1289 0 1 2 3 4 5 6 7 CHANNEL COM ( –) 8 Single-Ended + + + + + + + 0,1 CHANNEL 4 Differential 2,3 4,5 6,7 + (–) + + (–) + (–) + (–) – (+) – (+) – (+) – (+) 4 5 6 7 CHANNEL COM ( –) Combinations of Differential and Single-Ended + + + + + + 0,1 2,3 – – COM (UNUSED) Changing the MUX Assignment “On the Fly” COM ( –) 4,5 6,7 5,4 1ST CONVERSION 2ND CONVERSION + – + – + – + + 7 6 { { { { { { { { { { LTC1289 AIF01 |
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