7.3.1 Input Protection Circuitry

The TLVx197-Q1 use a unique input architecture to eliminate the need for input protection diodes, but still provide robust input protection under transient conditions. Conventional input diode protection schemes shown in Figure 34 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 35. For low-gain circuits, these fast-ramping input signals forward-bias back-to-back diodes, cause an increase in input current, and result in extended settling time.

Figure 34. TLVx197-Q1 Input Protection Does Not Limit Differential Input Capability

Figure 35. Back-to-Back Diodes Create Settling Issues

The TLVx197-Q1 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, and makes the device an excellent choice for multichannel, high-switched, input applications. The TLVx197-Q1 tolerates a maximum differential swing (voltage between inverting and noninverting pins of the op amp) of up to 36 V, thus making the device great for use as a comparator or in applications with fast-ramping input signals such as multiplexed data-acquisition systems; see Figure 41.