OPAX140 datasheet(24/56 Pages) TI2

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Available as a web based tool from the WEBENCH Design Center, the WEBENCH Filter Designer allows you to

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8.2.3 Application Curve

Frequency (Hz)

-60

-40

-20

100

10k

100k

Figure 8-2. OPAx140 Second-Order, 25-kHz, Chebyshev, Low-Pass Filter

8.3 Power Supply Recommendations

The OPAx140 is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V); many specifications apply from

–40°C to 125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature

are presented in Section 6.8.

CAUTION

Supply voltages larger than 40 V can permanently damage the device; see Section 6.1.

Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or

high-impedance power supplies. For more detailed information on bypass capacitor placement, see Section 8.4.

8.4 Layout

8.4.1 Layout Guidelines

For best operational performance of the device, use good PCB layout practices, including:

• Noise can propagate into analog circuitry through the power pins of the circuit as a whole and op amp itself.

Bypass capacitors are used to reduce the coupled noise by providing low-impedance power sources local to

the analog circuitry.

– Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as

close to the device as possible. A single bypass capacitor from V+ to ground is applicable for single-

supply applications.

• Separate grounding for analog and digital portions of circuitry is one of the simplest and most-effective

methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground planes.

A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically separate digital

and analog grounds paying attention to the flow of the ground current. For more detailed information, see

Circuit Board Layout Techniques.

OPA140, OPA2140, OPA4140

SBOS498F – JUNE 2010 – REVISED MARCH 2023

www.ti.com

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