OPA2192 datasheet(24/61 Pages) TI2

24 / 61 page

±100

±80

±60

±40

±20

100

Time ( s)

C040

Standard Input Diode Structure

Extends Settling Time

OPA192 Input Structure

Offers Fast Settling

0.1% Settling = ±10 mV

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

OPA192

36 V

~0.7 V

VOUT

V+

Conventional Input Protection

Limits Differential Input Range

OPA192 Provides Full 36-V

Differential Input Range

VIN+

VIN

VOUT

V+

VIN+

VIN

OPA192, OPA2192, OPA4192

SBOS620E – DECEMBER 2013 – REVISED NOVEMBER 2015

www.ti.com

8.3 Feature Description

8.3.1 Input Protection Circuitry

The OPAx192 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 54 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 55. 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, as shown in Figure 56.

Figure 54. OPA192 Input Protection Does Not Limit Differential Input Capability

Figure 55. Back-to-Back Diodes Create Settling Issues

Figure 56. OPA192 Protection Circuit Maintains Fast-Settling Transient Response

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Product Folder Links: OPA192 OPA2192 OPA4192

OPA2192 Datasheet(PDF) 24 Page - Texas Instruments

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