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INA116PA Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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INA116PA Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 9 page ® 7 INA116 APPLICATIONS INFORMATION Figure 1 shows the connections required for basic operation of the INA116. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the supply pins as shown. The output is referred to the output reference (Ref) terminal which is normally grounded. This must be a low impedance connection to assure good common-mode rejection. A resis- tance of 30 Ω in series with this connection will cause a typical device to degrade to approximately 72dB CMR at G = 1. SETTING THE GAIN Gain of the INA116 is set by connecting a single external resistor, RG, as shown. The gain is— Commonly used gains and resistor values are shown in Figure 1. The 50k Ω term in equation 1 is the sum of the two feedback resistors of A 1 and A2. These on-chip metal film resistors are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA116. The stability and temperature drift of RG also affect gain. RG’s contribution to gain accuracy and drift can be directly inferred from the gain equation (1). Low resistor values required for high gain make wiring resistance important. Sockets add to the wiring resistance that will contribute additional gain error in gains of approximately 100 or greater. OFFSET TRIMMING The INA116 is laser trimmed for low offset voltage and offset voltage drift; most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the output offset voltage. A voltage applied to the Ref terminal is summed at the output. Op amp A 1 provides a low source impedance for the Ref terminal, assuring good common-mode rejection. G = 1 + 50k Ω R G (1) FIGURE 1. Basic Connections. INA116 R G Also drawn in simplified form: V O Ref V IN – V IN + A 1 A 2 A 3 R 4 60k Ω R 3 60k Ω R 2 60k Ω R 1 60k Ω V IN V IN R G V– INA116 V O Ref G = 1 + 50k Ω R G – + R FB 25k Ω R FB 25k Ω +1 +1 Over-Voltage Protection Over-Voltage Protection 4 3 2 1 16 5 6 7 8 11 9 13 Input Guards See Text. 0.1µF V+ 0.1µF DESIRED GAIN 1 2 5 10 20 50 100 200 500 1000 2000 5000 10000 NC: No Connection. R G ( Ω) NC 50.00k 12.50k 5.556k 2.632k 1.02k 505.1 251.3 100.2 50.05 25.01 10.00 5.001 NEAREST 1% R G ( Ω) NC 49.9k 12.4k 5.62k 2.61k 1.02k 511 249 100 49.9 24.9 10 4.99 |
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