OPA196IDBVT datasheet(30/52 Pages) TI2

30 / 52 page

VCC

VEE

VOUT

VIN

Op Amp Gain Stage

Slew Rate Limiter

OPA196

VCC

VEE

OPA196

OPA196, OPA2196, OPA4196

SBOS869 – JULY 2017

www.ti.com

Product Folder Links: OPA196 OPA2196 OPA4196

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Typical Applications (continued)

This design systematically approaches each analog circuit block to achieve a 16-bit settling for a full-scale input

stage voltage and linearity for a 10-kHz sinusoidal input signal at each input channel. The first step in the design

is to understand the requirement for an extremely-low-impedance input-filter design for the mux. This

understanding helps in the decision of an appropriate input filter and selection of a mux to meet the system

settling requirements. The next important step is the design of the attenuating analog front-end (AFE) used to

level translate the high-voltage input signal to a low-voltage ADC input while maintaining the amplifier stability.

Then, the next step is to design a digital interface to switch the mux input channels with minimum delay. The final

design challenge is to design a high-precision, reference-driver circuit that provides the required REFP reference

voltage with low offset, drift, and noise contributions.

For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test

results, refer to TI Precision Design TIDU181, 16-bit, 400-kSPS, 4-Channel, Multiplexed Data Acquisition

System for High Voltage Inputs with Lowest Distortion.

8.2.3 Slew Rate Limit for Input Protection

In control systems for valves or motors, abrupt changes in voltages or currents can cause mechanical damages.

By controlling the slew rate of the command voltages into the drive circuits, the load voltages ramps up and down

at a safe rate. For symmetrical slew-rate applications (positive slew rate equals negative slew rate), one

additional op amp provides slew-rate control for a given analog gain stage. The unique input protection and high

output current and slew rate of the OPAx196 make the device an optimal amplifier to achieve slew rate control

for both dual- and single-supply systems.Figure 50 shows the OPA196 in a slew-rate limit design.

Figure 50. Slew Rate Limiter Uses One Op Amp

For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test

results, refer to TI Precision Design TIDU026, Slew Rate Limiter Uses One Op Amp.

OPA196IDBVT Datasheet(PDF) 30 Page - Texas Instruments