OPA2191ID datasheet(23/57 Pages) TI

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Input Low-Pass Filter

Ron_mux

Sn+1

Simplified Mux Model

RFILT

CFILT

Vn = 10 V

Vn+1 = ±10 V

10 V

±10 V

Buffer Amplifier

Idiode_transient

10 V

~±9.3 V

VIN+

VIN±

~0.7 V

VOUT

±10 V

Ron_mux

OPAx191

36 V

~0.7 V

VOUT

V+

Conventional Input Protection

Limits Differential Input Range

OPAx191 Provides Full 36-

V Differential Input Range

VIN+

VIN

VOUT

V+

VIN+

VIN

OPA191, OPA2191, OPA4191

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SBOS701C – DECEMEBER 2015 – REVISED OCTOBER 2019

Product Folder Links: OPA191 OPA2191 OPA4191

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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 OPAx191 tolerates a maximum differential swing (voltage between inverting and noninverting pins of the op

amp) of up to 36 V, making the device an excellent choice for use as a comparator or in applications with fast-

ramping input signals such as multiplexed data-acquisition systems (see Figure 64).

OPA2191ID Datasheet(PDF) 23 Page - Texas Instruments

OPA2191ID Datasheet(HTML) 23 Page - Texas Instruments

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