CBM8564AS14 datasheet(9/15 Pages) COREBAI

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CBM8561-CBM8562-CBM8564

OPERATION INSTRUCTION

APPLICATION NOTES

The CBM8561, CBM8562, CBM8564 series op

amps are unity-gain stable and free from unexpected

output phase reversal. They use auto-zeroing

techniques to provide low offset voltage and very low

drift over time and temperature.

Good layout practice mandates use of a 0.1μF

capacitor placed closely across the supply pins.

For

lowest

offset

voltage

and

precision

performance,

circuit

layout

and

mechanical

conditions should be optimized. Avoid temperature

gradients that create thermoelectric (Seebeck) effects

in thermocouple junctions formed from connecting

dissimilar conductors. These thermally-generated

potentials can be made to cancel by assuring that

they are equal on both input terminals.



Use low thermoelectric-coefficient connections

(avoid dissimilar metals).



Thermally isolate components from power

supplies or other heat-sources.



Shield op amp and input circuitry from air

currents, such as cooling fans.

Following these guidelines will reduce the

likelihood

junctions

being

different

temperatures, which can cause thermoelectric

voltages of 0.1μV/°C or higher, depending on

materials used.

OPERATING VOLTAGE

The CBM8561, CBM8562, CBM8564 series op

amps operate over a power-supply range of +2.9V to

+5.5V (±1.45V to ±2.75V). Supply voltages higher

than 7V (absolute maximum) can permanently

damage the amplifier. Parameters that vary over

supply voltage or temperature are shown in the

Typical Characteristics section of this data sheet.

LAYOUT GUIDELINES

Attention to good layout practices is always

recommended. Keep traces short. When possible, use

a PCB ground plane with surface-mount components

placed as close to the device pins as possible. Place a

0.1μF capacitor closely across the supply pins. These

guidelines should be applied throughout the analog

circuit to improve performance and provide benefits

such

reducing

the

EMI

(electromagnetic-interference) susceptibility.

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