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OP275GSZ データシート(PDF) 10 Page - Analog Devices |
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OP275GSZ データシート(HTML) 10 Page - Analog Devices |
10 / 12 page OP275 –10– OP275 –11– and dc offset errors. If the parallel combination of RF and RG is larger than 2 k, then an additional resistor, RS, should be used in series with the noninverting input.The value of RS is deter- mined by the parallel combination of RF and RG to maintain the low distortion performance of the OP275. Driving Capacitive Loads The OP275 was designed to drive both resistive loads to 600 and capacitive loads of over 1000 pF and maintain stability.While there is a degradation in bandwidth when driving capacitive loads, the designer need not worry about device stability.The graph in Figure 16 shows the 0 dB bandwidth of the OP275 with capaci- tive loads from 10 pF to 1000 pF. 10 9 8 7 6 5 4 3 2 1 0 0 200 400 600 800 1000 C LOAD – pF Figure 16. Bandwidth vs. CLOAD High Speed, Low Noise Differential Line Driver The circuit in Figure 17 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 load. The high slew rate and wide bandwidth of the OP275 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. 1 2 3 A2 1 3 2 A1 5 6 7 A3 VIN VO1 VO2 R3 2k R9 50 R11 1k P1 10k R12 1k R10 50 R8 2k R2 2k R5 2k R4 2k R1 2k R7 2k VO2 – VO1 = VIN A1 = 1/2 OP275 A2, A3 = 1/2 OP275 GAIN = SET R2, R4, R5 = R1 AND R6, R7, R8 = R3 R3 R1 R6 2k – + – + Figure 17. High Speed, Low Noise Differential Line Driver 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. A 3-Pole, 40 kHz Low-Pass Filter The closely matched and uniform ac characteristics of the OP275 make it ideal for use in GIC (Generalized Impedance Converter) and FDNR (Frequency-Dependent Negative Resistor) filter applications. The circuit in Figure 18 illustrates a linear-phase, 3-pole, 40 kHz low-pass filter using an OP275 as an inductance simulator (gyrator). The circuit uses one OP275 (A2 and A3) for the FDNR and one OP275 (A1 and A4) as an input buffer and bias current source for A3. Amplifier A4 is configured in a gain of 2 to set the pass band magnitude response to 0 dB. The ben- efits of this filter topology over classical approaches are that the op amp used in the FDNR is not in the signal path and that the filter’s performance is relatively insensitive to component varia- tions. Also, the configuration is such that large signal levels can be handled without overloading any of the filter’s internal nodes. As shown in Figure 19, the OP275’s symmetric slew rate and low distortion produce a clean, well behaved transient response. VIN 3 2 1 A1 R1 95.3k R2 787 C1 2200pF C2 2200pF R3 1.82k C3 2200pF R4 1.87k R5 1.82k A2 1 2 3 5 6 7 A3 R6 4.12k C4 2200pF R7 100k 5 6 7 A4 R8 1k R9 1k VOUT A1, A4 = 1/2 OP275 A2, A3 = 1/2 OP275 – + – + Figure 18. A 3-Pole, 40 kHz Low-Pass Filter VOUT 10V p-p 10kHz SCALE: VERTICAL–2V/ DIV HORIZONTAL–10s/ DIV 10 0% 100 90 Figure 19. Low-Pass FilterTransient Response REV. C REV. C |
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同様の説明 - OP275GSZ |
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