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INA331AIDGKR Datasheet(PDF) 9 Page - Texas Instruments |
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INA331AIDGKR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page INA331, INA2331 SBOS215C 9 www.ti.com APPLICATIONS INFORMATION The INA331 is a modified version of the classic “two op amp” instrumentation amplifier, with an additional gain amplifier. Figure 1 shows the basic connections for the operation of the INA331 and INA2331. The power supply should be capaci- tively decoupled with 0.1 µF capacitors as close to the INA331 as possible for noisy or high-impedance applications. The output is referred to the reference terminal, which must be at least 1.2V below the positive supply rail. OPERATING VOLTAGE The INA331 family is fully specified over a supply range of +2.7V to +5.5V, with key parameters tested over the tempera- ture range of –55 °C to +125°C. Parameters that vary signifi- cantly with operating conditions, such as load conditions or temperature, are shown in the Typical Characteristics. The INA331 may be operated on a single supply. Figure 2 shows a bridge amplifier circuit operated from a single +5V supply. The bridge provides a small differential voltage riding on an input common-mode voltage. FIGURE 2. Single-Supply Bridge Amplifier. FIGURE 1. Basic Connections. 40k Ω 10k Ω 10k Ω 40k Ω 3 2 5 1 7 8 4 Also drawn in simplified form: 6 REF 0.1 µF 0.1 µF RG V IN– V IN+ V– V+ A1 A3 A2 V O = ((VIN+) – (VIN –)) • G Short V OUT to RG for G = 5 5 10 50 100 SHORT 100k Ω 90k Ω 190k Ω OPEN 100k Ω 10k Ω 10k Ω R 2 R 1 Shutdown (For Single Supply) DESIRED GAIN (V/V) R 1 R 2 G = 5 + 5 (R 2 / R1 ) INA331 5 3 2 V OUT 8 7 6 4 1 V+ Shutdown RG V IN– V– V IN+ REF Bridge Sensor +5V NOTE: (1) REF should be adjusted for the desired output level, keeping in mind that the value of REF affects the common-mode input range. See Typical Characteristics. INA331 5 3 2 V OUT 8 7 6 4 1 V+ Shutdown RG V IN– V– V IN+ REF(1) |
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