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INA101SG Datasheet(PDF) 5 Page - Burr-Brown (TI) |
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INA101SG Datasheet(HTML) 5 Page - Burr-Brown (TI) |
5 / 6 page ® INA101 5 INPUT NOISE VOLTAGE vs FREQUENCY (100 ≤ GAIN ≤ 1000) Frequency (Hz) 0 1000 100 10 1 10 100 1000 OUTPUT NOISE vs GAIN Gain (V/V) 0 30 20 10 0 10 100 1000 R S = 1MΩ R S = 1000kΩ R S = 10kΩ R S = 0 SETTLING TIME vs GAIN Gain (V/V) 1 100 1000 10 1000 100 10 1% R L = 2kΩ C L = 1000pF 0.01% 0.1% (1) G = 1 + TYPICAL PERFORMANCE CURVES (CONT) At +25 °C, V CC = ±15V unless otherwise noted. 40k Ω R G APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA101. (Pin numbers shown are for the TO-100 metal package.) 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 output Common terminal which is normally grounded. This must be a low-impedance con- nection to assure good common-mode rejection. A resis- tance greater than 0.1 Ω in series with the Common pin will cause common-mode rejection to fall below 106dB. SETTING THE GAIN Gain of the INA101 is set by connecting a single external resistor, RG: The 40k Ω term in equation (1) comes from the sum of the two internal feedback resistors. These are on-chip metal film resistors which are laser trimmed to accurate absolute val- ues. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifi- cations of the INA101. The stability and temperature drift of the external gain setting resistor, RG, also affects 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 can make wiring resistance important. Sockets add to the wiring resistance which will contribute additional gain error (possi- bly an unstable gain error) in gains of approximately 100 or greater. The gain sense connections on the DIP and SOL-16 packages (see Figure 2) reduce the gain error produced by wiring or socket resistance. |
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