9 Power Supply Recommendations

The OPAx328 is 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 6.6.

CAUTION

Supply voltages larger 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 10.

10 Layout

10.1 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.

10.2 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 10-1. Operational Amplifier Board Layout for Noninverting Configuration

OPA2328

SBOS957 – FEBRUARY 2022

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