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OP285GSZ Datenblatt(PDF) 9 Page - Analog Devices |
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OP285GSZ Datenblatt(HTML) 9 Page - Analog Devices |
9 / 16 page REV. A OP285 –9– +15V + 2 3 8 1 4 VIN VOUT –15V 10pF + 10 F 0.1 F 4.99k 2k 0.1 F 10 F 2.49k 4.99k 1/2 OP285 Figure 9. Unity-Gain Inverter In inverting and noninverting applications, the feedback resis- tance forms a pole with the source resistance and capacitance (RS and CS) and the OP285’s input capacitance (CIN), as shown in Figure 10. With RS and RF in the kilohm range, this pole can create excess phase shift and even oscillation. A small capacitor, CFB, in parallel with RFB eliminates this problem. By setting RS (CS + CIN) = RFBCFB, the effect of the feedback pole is completely removed. CFB RFB CIN VOUT RS CS Figure 10. Compensating the Feedback Pole High-Speed, Low-Noise Differential Line Driver The circuit of Figure 11 is a unique line driver widely used in industrial applications. With ±18 V supplies, the line driver can deliver a differential signal of 30 V p-p into a 2.5 k Ω load. The high slew rate and wide bandwidth of the OP285 combine to yield a full power bandwidth of 130 kHz while the low noise front end produces a referred-to-input noise voltage spectral density of 10 nV/ √Hz. The design is a transformerless, balanced transmission system where output common-mode rejection of noise is of paramount importance. Like the transformer-based design, either output can be shorted to ground for unbalanced line driver applications without changing the circuit gain of 1. Other circuit gains can be set according to the equation in the diagram. This allows the design to be easily set to noninverting, inverting, or differential operation. 2 3 A2 1 3 2 A1 5 6 7 A3 VIN VO1 VO2 VO2 – VO1 = VIN R2 2k A1 = 1/2OP285 A2, A3 = 1/2 OP285 GAIN = SET R2, R4, R5 = R1 AND R, R7, R8 = R2 1 R1 2k R3 2k R9 50 R11 1k P1 10k R12 1k R4 2k R5 2k R6 2k R10 50 R8 2k R7 2k Figure 11. High-Speed, Low-Noise Differential Line Driver Low Phase Error Amplifier The simple amplifier configuration of Figure 12 uses the OP285 and resistors to reduce phase error substantially over a wide frequency range when compared to conventional amplifier designs. This technique relies on the matched frequency characteristics of the two amplifiers in the OP285. Each amplifier in the circuit has the same feedback network which produces a circuit gain of 10. Since the two amplifiers are set to the same gain and are matched due to the monolithic construction of the OP285, they will exhibit identical frequency response. Recall from feedback theory that a pole of a feedback network becomes a zero in the loop gain response. By using this technique, the dominant pole of the amplifier in the feedback loop compensates for the domi- nant pole of the main amplifier, 1 2 3 A1 7 A2 5 6 R1 549 R2 4.99k R3 499 VIN VOUT R5 549 R4 4.99 A1, A2 = 1/2 OP285 Figure 12. Cancellation of A2’s Dominant Pole by A1 |
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