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MPC509AP Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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MPC509AP Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 18 page MPC508A, MPC509A 11 SBFS019A www.ti.com Direct Multiplexer Output Buffered OPA602 1/4 OPA404 MPC508A Out Out In 1 In 2 In 3 In 8 A 0 A1 A2 2 8 A 0 A1 A2 MPC508A 8 2 6-Bit Channel Address Generator A 0 A1 A2 In 1 In 2 In 3 In 8 In 1 In 8 MPC508A En En Out En +V +V +V 4LSBs 4MSBs Settling Time to ±0.01% is 20µs with R S = 100Ω INSTALLATION AND OPERATING INSTRUCTIONS The ENABLE input, pin 2, is included for expansion of the number of channels on a single node as illustrated in Figure 5. With ENABLE line at a logic 1, the channel is selected by the 2-bit (MPC509A) or 3-bit (MPC508A) Channel Select Address (shown in the Truth Tables). If ENABLE is at logic 0, all channels are turned OFF, even if the Channel Address Lines are active. If the ENABLE line is not to be used, simply tie it to +VSUPPLY. If the +15V and/or –15V supply voltage is absent or shorted to ground, the MPC509A and MPC508A multiplexers will not be damaged; however, some signal feedthrough to the output will occur. Total package power dissipation must not be exceeded. For best settling speed, the input wiring and interconnections between multiplexer output and driven devices should be kept as short as possible. When driving the digital inputs from TTL, open collector output with pull-up resistors are recommended To preserve common-mode rejection of the MPC509A, use twisted-shielded pair wire for signal lines and inter-tier connections and/or multiplexer output lines. This will help common-mode capacitance balance and reduce stray signal pickup. If shields are used, all shields should be connected as close as possible to system analog common or to the com- mon-mode guard driver. CHANNEL EXPANSION Single-Ended Multiplexer (MPC508A) Up to 32 channels (four multiplexers) can be connected to a single node, or up to 64 channels using nine MPC508A multiplexers on a two-tiered structure as shown in Figures 5 and 6. FIGURE 5. 32-Channel, Single-Tier Expansion. FIGURE 6. Channel Expansion Up to 64 Channels Using 8 x 8 Two-Tiered Expansion. Differential Multiplexer (MPC509A) Single or multitiered configurations can be used to expand multiplexer channel capacity up to 32 channels using a 32 x 1 or 16 channels using a 4 x 4 configuration. Single-Node Expansion The 32 x 1 configuration is simply eight (MPC509A) units tied to a single node. Programming is accomplished with a 5-bit counter, using the 2LSBs of the counter to control Channel Address inputs A0 and A1 and the 3MSBs of the counter to drive a 1-of-8 decoder. The 1-of-8 decoder then is used to drive the ENABLE inputs (pin 2) of the MPC509A multiplexers. Two-Tier Expansion Using a 4 x 4 two-tier structure for expansion to 16 channels, the programming is simplified. A 4-bit counter output does not require a 1-of-8 decoder. The 2LSBs of the counter drive the A0 and A1 inputs of the four first-tier multiplexers and the 2MSBs of the counter are applied to the A0 and A1 inputs of the second-tier multiplexer. 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 cannot be taken from any channel, whereas only one channel group is failed (4 or 8) in the multitiered configuration. MPC 508A Out Group 1 Group 4 Out Enable Enable 20 21 22 23 24 Settling Time to 0.01% for R S < 100Ω —Two MPC508A units in parallels: 10µs —Four MPC509 A units in parallels: 12µs Direct Multiplexer Output Buffered OPA602 1/4 OPA404 5-Bit Binary Counter To Group 2 To Group 3 In 1 In 2 In 3 In 8 A 2 A1 A0 2 8 A 2 A1 A0 MPC 508A Group 1 Ch1-8 2 8 In 1 In 2 In 3 In 8 Group 4 Ch25-42 |
Similar Part No. - MPC509AP |
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Similar Description - MPC509AP |
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