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OPA191_00017 Datasheet(PDF) 23 Page - Texas Instruments |
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OPA191_00017 Datasheet(HTML) 23 Page - Texas Instruments |
23 / 52 page Input Low Pass Filter Ron_mux CS CS CD Sn Sn+1 D Simplified Mux Model RFILT RFILT CFILT CFILT Vn = +10 V Vn+1 = ±10 V +10 V ±10 V Buffer Amplifier 1 2 Idiode_transient +10 V ~±9.3 V 1 Vin+ Vin± ~0.7 V Vout 2 ±10 V Ron_mux OPAx191 36 V ~0.7 V VOUT V+ V Conventional Input Protection Limits Differential Input Range OPAx191 Provides Full 36- V Differential Input Range VIN+ VIN VOUT V+ V VIN+ VIN 23 OPA191, OPA2191, OPA4191 www.ti.com SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016 Product Folder Links: OPA191 OPA2191 OPA4191 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Input Protection Circuitry The OPAx191 uses a unique input architecture to eliminate the need for input protection diodes but still provides robust input protection under transient conditions. Conventional input diode protection schemes shown in Figure 51 can be activated by fast transient step responses and can introduce signal distortion and settling time delays because of alternate current paths, as shown in Figure 52. For low-gain circuits, these fast-ramping input signals forward-bias back-to-back diodes that cause an increase in input current, resulting in extended settling time. Figure 51. OPA191 Input Protection Does Not Limit Differential Input Capability Figure 52. Back-to-Back Diodes Create Settling Issues The OPAx191 family of operational amplifiers provides a true high-impedance differential input capability for high- voltage applications. This patented input protection architecture does not introduce additional signal distortion or delayed settling time, making the device an optimal op amp for multichannel, high-switched, input applications. The OPA191 can tolerate a maximum differential swing (voltage between inverting and noninverting pins of the op amp) of up to 36 V, making the device suitable for use as a comparator or in applications with fast-ramping input signals such as multiplexed data-acquisition systems (see Figure 64. |
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