TLV9352IDDFR datasheet(20/52 Pages) TI

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7.3 Feature Description

7.3.1 Input Protection Circuitry

The TLV935x uses a patented input architecture to eliminate the requirement for input protection diodes but still

provides robust input protection under transient conditions. Figure 7-1 shows conventional input diode protection

schemes that are activated by fast transient step responses and introduce signal distortion and settling time

delays because of alternate current paths, as shown in Figure 7-2. For low-gain circuits, these fast-ramping input

signals forward-bias back-to-back diodes, causing an increase in input current and resulting in extended settling

time.

TLV935x

40 V

~0.7 V

VOUT

V+

Conventional Input Protection

Limits Differential Input Range

OPAx990 Provides Full 40-V

Differential Input Range

VIN+

VIN

VOUT

V+

VIN+

VIN

Figure 7-1. TLV935x Input Protection Does Not Limit Differential Input Capability

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

Figure 7-2. Back-to-Back Diodes Create Settling Issues

The TLV935x 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 TLV935x tolerates a maximum differential swing (voltage between inverting and noninverting pins of the op

amp) of up to 40 V, making the device suitable for use as a comparator or in applications with fast-ramping input

signals.

TLV9352

SBOS994B – NOVEMBER 2019 – REVISED AUGUST 2020

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