8.3 Power Supply Recommendations

The OPAx328 are specified for operation from 2.2 V to 5.5 V (±1.1 V to ±2.75 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 6.7.

CAUTION

Supply voltages greater than 6 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

The OPA328 is a wideband amplifier. To realize the full operational performance of the device, good high-

frequency PCB layout practices are required. The bypass capacitors must be connected between each supply

pin and ground as close to the device as possible. The bypass capacitor traces should be designed for minimum

inductance.

8.4.2 Layout Example

OUT A

-IN A

+IN A

V–

OUT B

-IN B

+IN B

V+

VS–

GND

Ground (GND) plane on another layer

Keep input traces short

and run the input traces

as far away from

the supply lines

as possible.

Place components

close to device and to

each other to reduce

parasitic errors.

Use low-ESR,

ceramic bypass

capacitor. Place as

close to the device

as possible.

VIN A

GND

RF

RG

VIN B

GND

RF

RG

VS+

GND

VOUT A

VOUT B

(Schematic Representation)

+

VIN B

VOUT B

RG

RF

+

VIN A

VOUT A

RG

RF

Use low-ESR,

ceramic bypass

capacitor. Place as

close to the device

as possible.

Figure 8-6. Operational Amplifier Board Layout for Noninverting Configuration

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OPA328, OPA2328

SBOS957C – FEBRUARY 2022 – REVISED MAY 2023

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