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LT1189MJ8 Datasheet(PDF) 9 Page - Linear Technology |
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LT1189MJ8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1189 Instrumentation Amplifier Rejects High Voltage Instrumentation amplifiers are often used to process slowly varying outputs from transducers. With the LT1189 it is easy to make an instrumentation amplifier that can respond to rapidly varying signals. Attenuation resistors in front of the LT1189 allow very large common-mode signals to be rejected while maintaining good frequency response. The input common-mode and differential-mode signals are reduced by 100:1, while the closed-loop gain is set to be 100, thereby maintaining unity-gain input to output. The unique topology allows for frequency re- sponse boost by adding 150pF to pin 8 as shown. S APPLICATI I FOR ATIO 3.5MHz Instrumentation Amplifier Rejects 120VP-P LT1189 • AI03 – + 100* 100* VCM 120VP-P VIN 10k* 10k* 100 Ω 150pF REF FB 4 7 5V –5V LT1189 6 2 1 3 8 * 0.1% RESISTORS WORST CASE CMRR = 48dB 10k Output of Instrumentation Amplifier with 1MHz Square Wave Riding on 120VP-P at the Input LT1189 • AI04 High Voltage Instrumentation Amplifier Response Operating with Low Closed-Loop Gain The LT1189 has been optimized for closed-loop gains of 10 or greater. The amplifier can be operated at much lower closed-loop gains with the aid of a capacitor CFB across the feedback resistor, (feedback zero). This capacitor lowers the closed-loop 3dB bandwidth. The bandwidth cannot be made arbitrarily low because CFB is a short at high frequency and the amplifier will appear configured unity-gain. As an approximate guideline, make BW × AVCL = 200MHz. This expression expands to: A RC MHz VCL FB FB 2 200 π ()( ) = or: C A MHz R FB VCL FB = ()( )( ) 200 2 π The effect of the feedback zero on the transient and frequency response is shown for AV = 4. FREQUENCY (Hz) 20 LT1189 • AI05 100M 10M 1M 100k 0 –20 –60 –40 COMMON-MODE RESPONSE DIFFERENTIAL-MODE RESPONSE |
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