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OPA37 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA37 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 22 page  OPA27, OPA37 10 SBOS135C www.ti.com COMPENSATION Although internally compensated for unity-gain stability, the OPA27 may require a small capacitor in parallel with a feedback resistor (RF) which is greater than 2kΩ. This ca- pacitor will compensate the pole generated by RF and CIN and eliminate peaking or oscillation. INPUT PROTECTION Back-to-back diodes are used for input protection on the OPA27 and OPA37. Exceeding a few hundred millivolts differ- ential input signal will cause current to flow, and without external current limiting resistors, the input will be destroyed. Accidental static discharge, as well as high current, can dam- age the amplifier’s input circuit. Although the unit may still be functional, important parameters such as input offset voltage, drift, and noise may be permanently damaged, as will any precision operational amplifier subjected to this abuse. Transient conditions can cause feedthrough due to the amplifier’s finite slew rate. When using the OPA27 as a unity-gain buffer (follower) a feedback resistor of 1k Ω is recommended, as shown in Figure 6. NOISE: BIPOLAR VERSUS FET Low-noise circuit design requires careful analysis of all noise sources. External noise sources can dominate in many cases, so consider the effect of source resistance on overall operational amplifier noise performance. At low source im- pedances, the lower voltage noise of a bipolar operational amplifier is superior, but at higher impedances the high current noise of a bipolar amplifier becomes a serious liabil- ity. Above about 15k Ω, the OPA111 low-noise FET opera- tional amplifier is recommended for lower total noise than the OPA27, as shown in Figure 5. FIGURE 3. Offset Voltage Trim. FIGURE 5. Voltage Noise Spectral Density Versus Source Resistance. FIGURE 6. Pulsed Operation. FIGURE 8. Unity-Gain Inverting Amplifier. FIGURE 7. Low-Noise RIAA Preamplifier. FIGURE 4. High Resolution Offset Voltage Trim. 1 2 3 4 6 ±4mV Typical Trim Range NOTE: (1) 10k Ω to 1MΩ Trim Potentiometer (10k Ω Recommended). +V CC –V CC OPA27/37 7 8 (1) 1 2 3 4 6 ±280µV Typical Trim Range NOTE: (1) 1k Ω Trim Potentiometer. +V CC –V CC OPA27/37 7 8 4.7k Ω 4.7k Ω (1) 100 1k 10k 100k 1M 10M 1k 100 10 1 OPA111 + Resistor OPA27 + Resistor Source Resistance, R S (Ω) E O R S E O = √en 2 + (i nRS) 2 + 4kTR S F O = 1kHz Resistor Noise Only OPA27 + Resistor OPA111 + Resistor Resistor Noise Only OPA27 Output 1.9V/ µs R F ≈ 1kΩ Input – + OPA37 Output 97.6k Ω G ≈ 40dB at 1kHz. Metal film resistors. Film capacitors. R L and CL per cartridge manufacturer’s recommendations. 100 Ω 2 3 6 0.03 µF 0.01 µF 7.87k Ω 1 µF 20k Ω R L Moving Magnet Cartridge C L OPA27 Output Input 1k Ω 1k Ω 2 3 6 |
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Similar Description - OPA37 |
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