6.3 Feature Description

6.3.1 Mux-Friendly Inputs

The OPAx596 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

6-2 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 6-3. For low-gain circuits, these fast-ramping input

signals forward-bias back-to-back diodes that cause an increase in input current and result in extended settling

time.

OPA596

85V

~0.7V

VOUT

V+

V

Conventional Input Protection Limits Differential Input Range

OPA596 Provides Full 85V Differential Input Range

VIN+

VIN

VOUT

V+

V

VIN+

VIN

Figure 6-2. OPA596 Input Protection Does Not Limit Differential Input Capability

Input Low-Pass Filter

Ron_mux

CS

CS

CD

Sn

Sn+1

D

Simplified Mux Model

RFILT

RFILT

CFILT

CFILT

Vn = 10V

Vn+1 = –10V

10V

–10V

Buffer Amplifier

1

2

Idiode_transient

10V

~–9.3V

1

VIN+

VIN–

~0.7V

VOUT

2

–10V

Ron_mux

Figure 6-3. Back-to-Back Diodes Create Settling Issues

The OPAx596 feature 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 these devices an excellent choice for multichannel, high-switched, input applications. The OPAx596

tolerate a maximum differential swing (voltage between inverting and noninverting pins of the op amp) of up

to 85V, making these devices a great choice for use as a comparator or in applications with fast-ramping or

switched input signals.

OPA596

SBOSA42 – JUNE 2024

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