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OPA862 Datasheet(PDF) 26 Page - Texas Instruments |
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OPA862 Datasheet(HTML) 26 Page - Texas Instruments |
26 / 37 page 8.2.3 DC Level-Shifting Often, applications must level-shift a ground-referenced signal to a non-ground voltage. Configurations in Figure 8-10 and Figure 8-11 show two different ways of level-shifting a signal by using the OPA862 without having to use external resistors, saving board cost and space. These configurations leverage the fixed noninverting gain- of-2 configuration of A2 and the summing configuration of A1 to level-shift the signal at VOUT–. The internal resistors of the OPA862 are extremely well-matched to maintain the gain-of-2 accuracy of A2. Similarly matched external resistors can add significant cost to the system and often are more expensive than the amplifier itself. Apart from the polarity of the VDC-shift at the output, a key difference between the configurations of Figure 8-10 and Figure 8-11 is that in the case of Figure 8-10, VDC only must be capable of driving the IB of A1 but in the case of Figure 8-11, VDC must be capable of driving higher currents, as given by I = VDC / RG when a noninverting input of A1 is grounded. VOUT+ VOUT± A1 + ± A2 + ± 700 700 1 8 5 +7 V 3 OPA862 RINT RINT 4 0.1 µF 0.1 µF 6 7 2 VIN VDC = ±2.5 V ±2.5 V IB VIN VOUT+ and VOUT± voltages are with respect to GND VIN 0 V VOUT± 0 V 2.5 V ±VDC -1.25 V 1.25 V 5 V 2 × VIN Figure 8-10. Level-Shifting With a DC Source of Polarity Opposite to the Desired DC Shift VOUT+ VOUT± A1 + ± A2 + ± 700 700 1 8 5 +7 V 3 OPA862 RINT RINT 4 0.1 µF 0.1 µF 6 7 2 VIN VOUT+ and VOUT± voltages are with respect to GND VDC = 2.5 V VIN 0 V VOUT± 0 V 2.5 V VDC ±2.5 V RF RG = RF I = VDC RG -1.25 V 1.25 V 5 V 2 × VIN Figure 8-11. Level-Shifting With a DC Source of Polarity Same as the Desired DC Shift OPA862 SBOS919C – AUGUST 2019 – REVISED AUGUST 2020 www.ti.com 26 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: OPA862 |
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