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INA125U Datasheet(PDF) 10 Page - Texas Instruments |
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INA125U Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page 10 ® INA125 APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA125. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. The output is referred to the instrumentation amplifier refer- ence (IAREF) terminal which is normally grounded. This must be a low impedance connection to assure good com- mon-mode rejection. A resistance of 12 Ω in series with the IAREF pin will cause a typical device to degrade to approxi- mately 80dB CMR (G = 4). Connecting V REFOUT (pin 4) to one of the four available reference voltage pins (VREFBG, VREF2.5, VREF5, or VREF10) provides an accurate voltage source for bridge applications. For example, in Figure 1 VREFOUT is connected to VREF10 thus supplying 10V to the bridge. It is recommended that VREFOUT be connected to one of the reference voltage pins even when the reference is not being utilized to avoid saturating the reference amplifier. Driving the SLEEP pin LOW puts the INA125 in a shutdown mode. SETTING THE GAIN Gain of the INA125 is set by connecting a single external resistor, RG, between pins 8 and 9: (1) Commonly used gains and RG resistor values are shown in Figure 1. DESIRED GAIN RG NEAREST 1% (V/V) ( Ω)R G VALUE (Ω) 4NC NC 5 60k 60.4k 10 10k 10k 20 3750 3740 50 1304 1300 100 625 619 200 306 309 500 121 121 1000 60 60.4 2000 30 30.1 10000 6 6.04 NC: No Connection. FIGURE 1. Basic Connections. G =4 + 60 k Ω R G A 1 Ref Amp 10V A 2 30k Ω 10k Ω 10k Ω 30k Ω Bandgap V REF 13 12 1 14 15 16 4 6 9 10 11 IA REF V O 5 8 7 R G Load Sense + – R(2) R 2R 4R INA125 V REFCOM V REFBG V REF2.5 V REF5 V REF10 V REFOut V IN 0.1µF V+ + V IN – 2 SLEEP(1) 3 0.1µF V– V O = (VIN – VIN) G G = 4 + 60k Ω +– R G NOTE: (1) SLEEP pin should be connected to V+ if shutdown function is not being used. (2) Nominal value of R is 21k Ω, ±25%. |
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