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OPA862 Arkusz danych(PDF) 21 Page - Texas Instruments |
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OPA862 Arkusz danych(HTML) 21 Page - Texas Instruments |
21 / 37 page 8 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. 8.1 Application Information 8.1.1 Single-Ended-to-Differential Gain of 4 V/V Figure 8-1 shows the configuration that can be used for a single-ended-to-differential gain of 4 V/V. Amplifier A1 follows all the conventional equations of a regular voltage-feedback amplifier for inverting and noninverting gains. With the fixed inverting gain of –1 V/V for the configuration of A2, the primary role of A2 is to invert the output of A1 so that a differential signal is available at the output pins, VOUT+ and VOUT–. In the configuration shown in Figure 8-1, VOUT+ is always in phase with VIN and equal to VIN times two. VOUT– has the same swing as VOUT+ but 180° out of phase. The common-mode voltage at A1 is equal to VIN and the common-mode voltage at A2 is equal to the voltage on the VREF pin, which in the case of Figure 8-1 is GND. A1 + ± A2 + ± 700 700 1 8 5 ±5 V +5 V 3 OPA862 RINT RINT 700 700 4 0.1 µF 0.1 µF 6 7 2 RF RG VIN + ± 1 k ROP 1 k RON VOUT+ VOUT± VREF VOUT+ and VOUT± voltages are with respect to GND VOD Figure 8-1. Single-Ended To Differential Gain of 4 V/V Configuration Equation 1 through Equation 4 can be derived from the configuration in Figure 8-1. The output common-mode voltage, VOCM, is the average of VOUT+ and VOUT–, and is equal to the voltage on the VREF pin as given by Equation 4. F OUT IN G R V V 1 R § · ¨ ¸ © ¹ (1) F OUT OUT REF IN REF G R V V 2 V V 1 2 V R § · u u ¨ ¸ © ¹ (2) F OD OUT OUT IN REF G R V V V 2 V 1 2 V R § · u u ¨ ¸ © ¹ (3) www.ti.com OPA862 SBOS919C – AUGUST 2019 – REVISED AUGUST 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 21 Product Folder Links: OPA862 |
Podobny numer części - OPA862_V02 |
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Podobny opis - OPA862_V02 |
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