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MPC801 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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MPC801 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 8 page 8 ® MPC801 CHANNEL EXPANSION Single-Tier Expansion Up to eight MPC801s can be connected to a single node to form a 64-channel single-ended multiplexer, or up to eight MPC801s can be connected to two nodes to form a 32-channel differential multiplexer. Programming is accomplished with a 6-bit address and a 1-of-8 decoder (see Figure 5). The decoder drives the enable inputs of the MPC801 turning on only one multiplexer at a time. Two-Tier Expansion Up to nine MPC801s can be connected in a two-tier structure to form a 64-channel single-ended multiplexer (see Figure 6), or up to five MPC801s can be connected in a two-tier structure to form a 16-channel differential multiplexer. Pro- gramming is accomplished with a 6-bit address. SINGLE VS MULTITIERED CHANNEL EXPANSION In addition to reducing programming complexity, two-tier configuration offers the added advantages over single-node expansion of reduced OFF channel current leakage (reduced Offset), better CMR, and a more reliable configuration if a channel should fail in the ON condition (short). Should a channel fail ON in the single-node configuration, data can- not be taken from any channel, whereas only one-channel group is failed (4 or 8) in the multitiered configuration. Enable Out A Out B In8 In1 In2 In3 A 0 A1 A2 MPC801 Enable Out A Out B In8 In1 In2 In3 A 0 A1 A2 MPC801 6-Bit Channel Address Generator 1 of 8 Decoder Multiplexer Output To multiplexers 3 - 8 FIGURE 5. 64-channel, Single-tier, Single-ended Expansion. Enable Out A Out B In8 In1 In2 In3 A 0 A1 A2 MPC801 Enable Out A Out B In8 In1 In2 In3 A 0 A1 A2 MPC801 6-Bit Channel Address Generator To multiplexers 3 - 8 Enable Out A Out B In8 In1 In2 In3 A 1 A2 A3 MPC801 Multiplexer Output FIGURE 6. 64-channel, Two-tier, Single-ended Expansion. |
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Similar Description - MPC801 |
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