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LMH6704MFXNOPB Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMH6704MFXNOPB Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 20 page 2 3 4 6 1 VOUT + - +5V -5V CPOS 6.8 µF .01 µF 6.8 µF CNEG .01 µF 0.1 µF CSS LMH6704 RIN VIN 2 3 4 6 1 VOUT + - VIN +5V -5V CPOS 6.8 µF .01 µF 6.8 µF CNEG .01 µF RIN 0.1 µF CSS LMH6704 2 3 4 6 1 VOUT + - VIN +5V -5V CPOS 6.8 µF .01 µF 6.8 µF CNEG .01 µF RIN 0.1 µF CSS LMH6704 NC LMH6704 SNOSAD0C – FEBRUARY 2005 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION Figure 17. Recommended Gain of +2 Circuit Figure 18. Recommended Gain of +1 Circuit Figure 19. Recommended Gain of −1 Circuit GENERAL INFORMATION The LMH6704 is a high speed current feedback Selectable Gain Buffer (SGB), optimized for very high speed and low distortion. With its internal feedback and gain-setting resistors the LMH6704 offers excellent AC performance while simplifying board layout and minimizing the affects of layout related parasitic components. The LMH6704 has no internal ground reference so single or split supply configurations are both equally useful. SETTING THE CLOSED LOOP GAIN The LMH6704 is a current feedback amplifier with on-chip RF = RG = 465Ω. As such it can be configured with an AV = +2, AV = +1, or an AV = −1 by connecting pins 3 and 4 as described in Table 1. Table 1. Input Connections GAIN AV Non-Inverting (Pin 3, SOT-23) Inverting (Pin 4, SOT-23) −1 V/V Ground Input Signal +1 V/V Input Signal NC (Open) +2 V/V Input Signal Ground The gain accuracy of the LMH6704 is accurate over temperature to within ±1%. The internal gain setting resistors, RFand RG, match very well. The LMH6704 architecture takes advantage of the fact that the internal gain setting resistors track each other well over a wide range of temperature and process variation to keep the overall gain constant, despite the fact that the individual resistors have nominal temperature drifts. Therefore, using external resistors in series with RG to change the gain will result in poor gain accuracy over temperature. 8 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LMH6704 |
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