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ADC08031CIWM Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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ADC08031CIWM Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 24 page Functional Description (Continued) enabled and whether this input is single-ended or differential. Differential inputs are restricted to adjacent channel pairs. For example, channel 0 and channel 1 may be selected as a differential pair but channel 0 or 1 cannot act differentially with any other channel. In addition to selecting differential mode the polarity may also be selected. Channel 0 may be selected as the positive input and channel 1 as the negative input or vice versa. This programmability is best illustrated by the MUX addressing codes shown in the following tables for the various product options. The MUX address is shifted into the converter via the DI line. Because the ADC08031 contains only one differential input channel with a fixed polarity assignment, it does not require addressing. The common input line (COM) on the ADC08038 can be used as a pseudo-differential input. In this mode the voltage on this pin is treated as the “−” input for any of the other input channels. This voltage does not have to be analog ground; it can be any reference potential which is common to all of the inputs. This feature is most useful in single-supply applica- tions where the analog circuity may be biased up to a poten- tial other than ground and the output signals are all referred to this potential. TABLE 1. Multiplexer/Package Options Part Number Number of Analog Channels Number of Package Pins Single-Ended Differential ADC08031 1 1 8 ADC08032 2 1 8 ADC08034 4 2 14 ADC08038 8 4 20 TABLE 2. MUX Addressing: ADC08038 Single-Ended MUX Mode MUX Address Analog Single-Ended Channel # START SGL/ ODD/ SELECT 01234567 COM DIF SIGN 1 0 11 0 0 0 + − 11 0 0 1 + − 11 0 1 0 + − 11 0 1 1 + − 11 1 0 0 + − 11 1 0 1 + − 11 1 1 0 + − 11 1 1 1 + − TABLE 3. MUX Addressing: ADC08038 Differential MUX Mode MUX Address Analog Differential Channel-Pair # START SGL/ ODD/ SELECT 0123 DIF SIGN 1001234567 10 0 0 0 + − 10 0 0 1 + − 10 0 1 0 + − 10 0 1 1 + − 10 1 0 0 − + 10 1 0 1 − + 10 1 1 0 − + 10 1 1 1 − + www.national.com 11 |
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