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ADC0838CCN Datasheet(PDF) 12 Page - Micro Linear Corporation |
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ADC0838CCN Datasheet(HTML) 12 Page - Micro Linear Corporation |
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12 / 26 page  ML2281, ML2282, ML2284, ML2288 12 FUNCTIONAL DESCRIPTION MULTIPLEXER ADDRESSING The design of these converters utilizes a sample data comparator structure which provides for a differential analog input to be converted by a successive approximation routine. The actual voltage converted is always the difference between an assigned “+” input terminal and a “–” input terminal. The polarity of each input terminal of the pair being converted indicates which line the converter expects to be the most positive. If the assigned “+” input is less than the “–” input, the converter responds with an all zeros output code. A unique input multiplexing scheme has been utilized to provide multiple analog channels with software configurable single ended, differential, or pseudo differential options. The pseudo differential option will convert the difference between the voltage at any analog input and a common terminal. One converter package can now accommodate ground referenced inputs and true differential inputs as well as signals with some arbitrary reference voltage. A particular input configuration is assigned during the MUX addressing sequence, prior to the start of a conversion. The MUX address selects which of the analog inputs are to be enabled and whether this input is single ended or differential. In the differential case, it also assigns the polarity of the analog channels. Differential inputs are restricted to adjacent channel pairs. For example, channel 0 and channel 1 may be selected as a different pair but channel 0 or channel 1 cannot act differentially with any other channel. In addition to selecting the differential mode, the sign 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 illustrated by the MUX addressing codes shown in Tables 1, 2, and 3. The MUX address is shifted into the converter via the DI input. Since the ML2281 contains only one differential input channel with a fixed polarity assignment, it does not require addressing. The common input line on the ML2288 can be used as a pseudo differential input. In this mode, the voltage on the COM 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 applications where the analog circuitry may be biased at a potential other than ground and the output signals are all referred to this potential. Since the input configuration is under software control, it can be modified, as required, at each conversion. A channel can be treated as a single-ended, ground referenced input for one conversion; then it can be reconfigured as part of a differential channel for another conversion. Figure 7 illustrates these different input modes. MUX ADDRESS ANALOG SINGLE-ENDED CHANNEL# SGL/ ODD/ SELECT DIF SIGN 1 001234567 COM 10 0 0 + – 10 0 1 + – 10 1 0 + – 10 1 1 + – 11 0 0 + – 11 0 1 + – 11 1 0 + – 11 1 1 + – SINGLE-ENDED MUX MODE MUX ADDRESS ANALOG DIFFERENTIAL CHANNEL-PAIR# SGL/ ODD/ SELECT 0123 DIF SIGN 1 0 0 1234567 00 0 0 + – 00 0 1 + – 00 1 0 + – 00 1 1 + – 01 0 0 – + 01 0 1 – + 01 1 0 – + 01 1 1 – + DIFFERENTIAL MUX MODE Table 1. ML2288 MUX Addressing 8 Single-Ended or 4 Differential Channels MUX ADDRESS CHANNEL# SGL/ ODD/ SELECT DIF SIGN 1 0123 10 0 + 10 1 + 11 0 + 11 1 + SINGLE-ENDED MUX MODE MUX ADDRESS CHANNEL# SGL/ ODD/ SELECT DIF SIGN 1 0123 00 0 + – 00 1 + – 01 0 – + 01 1 – + DIFFERENTIAL MUX MODE COM is internally tied to AGND Table 2. ML2284 MUX Addressing 4 Single-Ended or 2 Differential Channel |
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