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INA128 Datasheet(PDF) 9 Page - Texas Instruments |
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INA128 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 20 page  INA128 INA129 SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 www.ti.com 9 APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA128/INA129. 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 reference (Ref) terminal which is normally grounded. This must be a low-impedance connection to assure good common-mode rejection. A resistance of 8 Ω in series with the Ref pin will cause a typical device to degrade to approximately 80dB CMR (G = 1). SETTING THE GAIN Gain is set by connecting a single external resistor, RG, connected between pins 1 and 8: INA128: G + 1) 50kW R G INA129: G + 1) 49.4kW R G Commonly used gains and resistor values are shown in Figure 1. The 50k Ω term in Equation 1 (49.4kΩ in Equation 2) comes from the sum of the two internal feedback resistors of A1 and A2. These on-chip metal film resistors are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these internal resistors are included in the gain accuracy and drift specifications of the INA128/INA129. 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 (possibly an unstable gain error) in gains of approximately 100 or greater. DYNAMIC PERFORMANCE The typical performance curve Gain vs Frequency shows that, despite its low quiescent current, the INA128/INA129 achieves wide bandwidth, even at high gain. This is due to the current-feedback topology of the input stage circuitry. Settling time also remains excellent at high gain. NOISE PERFORMANCE The INA128/INA129 provides very low noise in most applications. Low frequency noise is approximately 0.2 µVPP measured from 0.1 to 10Hz (G ≥ 100). This provides dramatically improved noise when compared to state-of-the-art chopper-stabilized amplifiers. RG Also drawn in simplified form: INA128 Ref VO VIN VIN + − G + 1) 50k W R G G + 1) 49.4k W R G INA128: INA129: DESIRED RG NEAREST RG NEAREST GAIN (V/V) ( Ω) 1% RG (Ω)(Ω) 1% RG (Ω) 1 NCNC NCNC 2 50.00k 49.9k 49.4k 49.9k 5 12.50k 12.4k 12.35k 12.4k 10 5.556k 5.62k 5489 5.49k 20 2.632k 2.61k 2600 2.61k 50 1.02k 1.02k 1008 1k 100 505.1 511 499 499 200 251.3 249 248 249 500 100.2 100 99 100 1000 50.05 49.9 49.5 49.9 2000 25.01 24.9 24.7 24.9 5000 10.00 10 9.88 9.76 10000 5.001 4.99 4.94 4.87 INA128 INA129 NC: No Connection A 1 A2 A3 6 7 4 3 8 1 2 V IN VIN RG V+ INA128, INA129 + 5 Over−Voltage Protection Over−Voltage Protection Load + V O Ref NOTE: (1) INA129: 24.7k Ω − 0.1 µF 0.1 µF − V− 25k Ω(1) 25k Ω(1) 40k Ω 40k Ω 40k Ω 40k Ω V O =G (V IN − VIN + − • ) Figure 1. Basic Connections (1) (2) |
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