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AD8271ARMZ-R7 数据表(PDF) 16 Page - Analog Devices |
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AD8271ARMZ-R7 数据表(HTML) 16 Page - Analog Devices |
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16 / 20 page  AD8271 Rev. 0 | Page 16 of 20 APPLICATIONS INFORMATION The resistors and connections provided on the AD8271 offer abundant versatility through the variety of configurations that are possible. DIFFERENCE AMPLIFIER CONFIGURATIONS The AD8271 can be placed in difference amplifier configurations with gains of ½, 1, and 2. Figure 45 through Figure 47 show sample difference amplifier configurations referenced to ground. = 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 +IN GND OUT OUT N1 N2 N3 10 9 8 2 3 4 –IN –IN +IN 5k Ω 5k Ω 10k Ω 10k Ω GND Figure 45. Gain = ½ Difference Amplifier, Referenced to Ground = –IN +IN 10k Ω 10k Ω 10k Ω 10k Ω GND 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 +IN NC NC GND OUT OUT N1 N2 N3 10 9 8 2 3 4 –IN Figure 46. Gain = 1 Difference Amplifier, Referenced to Ground = –IN +IN 10k Ω 5k Ω 5k Ω 10k Ω GND 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 OUT OUT N1 N2 N3 10 9 8 2 3 4 –IN GND +IN OUT Figure 47. Gain = 2 Difference Amplifier, Referenced to Ground The AD8271 can also be referred to a combination of reference voltages. For example, the reference can be set at 2.5 V, using just 5 V and GND. Some of the possible configurations are shown in Figure 48 through Figure 50. Note that the output is not internally tied to a feedback path, so any of the 10 kΩ resistors on the inverting input can be used in the feedback network. This flexibility allows for more efficient board lay- out options. +VS + –VS 2 –IN = +IN 5k Ω 5k Ω 10k Ω 10k Ω 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 +IN –VS +VS OUT OUT N1 N2 N3 10 9 8 2 3 4 –IN Figure 48. Gain = ½ Difference Amplifier, Referenced to Midsupply = –IN +IN 10k Ω 10k Ω 10k Ω 10k Ω +VS + –VS 2 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 +IN NC NC OUT OUT N1 N2 N3 10 9 8 2 3 4 –IN –VS +VS Figure 49. Gain = 1 Difference Amplifier, Referenced to Midsupply = –IN +IN 10k Ω 5k Ω 5k Ω 10k Ω +VS + –VS 2 1 7 10k Ω AD8271 10k Ω 10k Ω 10k Ω 20k Ω 20k Ω 10k Ω P4 P3 P2 P1 +IN –VS +VS OUT OUT N1 N2 N3 10 9 8 2 3 4 +IN Figure 50. Gain = 2 Difference Amplifier, Referenced to Midsupply Table 8. Pin Connections for Difference Amplifier Configurations Configuration Gain and Reference Pin 1 (P1) Pin 2 (P2) Pin 3 (P3) Pin 4 (P4) Pin 8 (N1) Pin 9 (N2) Pin 10 (N3) Gain of ½, Referenced to Ground +IN GND GND GND OUT OUT −IN Gain of ½, Referenced to Midsupply +IN −VS +VS +VS OUT OUT −IN Gain of 1, Referenced to Ground +IN NC GND GND OUT NC −IN Gain of 1, Referenced to Midsupply +IN NC −VS +VS OUT NC −IN Gain of 2, Referenced to Ground +IN +IN GND GND OUT −IN −IN Gain of 2, Referenced to Midsupply +IN +IN −VS +VS OUT −IN −IN |
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