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INA217AIDWR Datasheet(PDF) 6 Page - Texas Instruments |
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INA217AIDWR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 11 page INA217 6 SBOS247B www.ti.com FIGURE 2. Input Stabilization Network. V+ V– V O 2 1 8 3 5 4 6 7 V IN– V IN+ INA217 47 Ω 47 Ω 1.2 µH 1.2 µH APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation. Power supplies should be bypassed with 0.1 µF tantalum capacitors near the device pins. The output Reference (pin 5) should be a low-impedance connection. Resistance of a few ohms in series with this connection will degrade the com- mon-mode rejection of the INA217. GAIN-SET RESISTOR Gain is set with an external resistor, RG, as shown in Figure 1. The two internal 5k Ω feedback resistors are laser-trimmed to 5k Ω within approximately ±0.2%. The gain equation for the INA217 is: G RG =+ 1 10 000 , The temperature coefficient of the internal 5k Ω resistors is approximately ±25ppm/°C. Accuracy and TCR of the exter- nal RG will also contribute to gain error and temperature drift. These effects can be inferred from the gain equation. Make a short, direct connection to the gain set resistor, RG. Avoid running output signals near these sensitive input nodes . NOISE PERFORMANCE The INA217 provides very low noise with low-source imped- ance. Its 1.3nV/ √Hz voltage noise delivers near-theoretical noise performance with a source impedance of 200 Ω. The input stage design used to achieve this low noise results in FIGURE 1. Basic Circuit Connections. relatively high input bias current and input bias current noise. As a result, the INA217 may not provide the best noise performance with a source impedance greater than 10k Ω. For source impedance greater than 10k Ω, other instrumen- tation amplifiers may provide improved noise performance. INPUT CONSIDERATIONS Very low source impedance (less than 10 Ω) can cause the INA217 to oscillate. This depends on circuit layout, signal source, and input cable characteristics. An input network consisting of a small inductor and resistor, as shown in Figure 2, can greatly reduce any tendency to oscillate. This is especially useful if a variety of input sources are to be connected to the INA217. Although not shown in other figures, this network can be used as needed with all applica- tions shown. A1 A2 A3 6k Ω 6k Ω 6 5 4 7 2 1 8 3 6k Ω 6k Ω V IN– V IN+ R G V+ V– V+ V– INA217 G = 1 + 10000 R G 5k Ω 5k Ω V OUT V O Sometimes Shown in Simplified Form: NOTE: (1) NC = No Connection. REF 0.1 µF 0.1 µF R G INA217 GAIN R G (V/V) (dB) ( Ω) 10 NC (1) 2 6 10000 5 14 2500 10 20 1111 20 26 526 50 34 204 100 40 101 200 46 50 500 54 20 1000 60 10 2000 66 5 V IN– V IN+ |
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