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LMP7704MT/NOPB Datasheet(PDF) 25 Page - Texas Instruments |
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LMP7704MT/NOPB Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 44 page  I = V2 ± V1 RS V2R R + R (V0 ± IRS)R V1R V0R + = + R + R R + R R + R + RS Z LOAD V1 V2 R R R R V + V + V - V - + - - I = (V2 ± V1) RS A1 A2 LMP7701, LMP7702, LMP7704 www.ti.com SNOSAI9I – SEPTEMBER 2005 – REVISED NOVEMBER 2015 8.4 Device Functional Modes 8.4.1 Precision Current Source The LMP770x can each be used as a precision current source in many different applications. Figure 46 shows a typical precision current source. This circuit implements a precision voltage controlled current source. Amplifier A1 is a differential amplifier that uses the voltage drop across RS as the feedback signal. Amplifier A2 is a buffer that eliminates the error current from the load side of the RS resistor that would flow in the feedback resistor if it were connected to the load side of the RS resistor. In general, the circuit is stable as long as the closed loop bandwidth of amplifier A2 is greater then the closed loop bandwidth of amplifier A1. If A1 and A2 are the same type of amplifiers, then the feedback around A1 will reduce its bandwidth compared to A2. Figure 46. Precision Current Source The equation for output current can be derived as shown in Equation 4. (4) Solving for the current I results in the Equation 5. (5) 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 9.1.1 Low Input Voltage Noise The LMP770x have the very low input voltage noise of 9 nV/ √Hz. This input voltage noise can be further reduced by placing N amplifiers in parallel as shown in Figure 47. The total voltage noise on the output of this circuit is divided by the square root of the number of amplifiers used in this parallel combination. This is because each individual amplifier acts as an independent noise source, and the average noise of independent sources is the quadrature sum of the independent sources divided by the number of sources. For N identical amplifiers, this means: Copyright © 2005–2015, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: LMP7701 LMP7702 LMP7704 |
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