NE5534, NE5534A, SA5534, SA5534A

SLOS070D – JULY 1979 – REVISED NOVEMBER 2014

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8.3 Feature Description

8.3.1 Offset-Voltage Null Capability

The input offset voltage of operational amplifiers (op amps) arises from unavoidable mismatches in the

differential input stage of the op-amp circuit caused by mismatched transistor pairs, collector currents, current-

gain betas (

β), collector or emitter resistors, and so on. The input offset pins allow the designer to adjust for

these mismatches by external circuitry. See the Application and Implementation section for more details on

design techniques.

8.3.2 Slew Rate

The slew rate is the rate at which an operational amplifier can change its output when there is a change on the

input. The NE5534 and SA5534 devices have a 13-V/

μs slew rate.

8.3.3 Common-Mode Rejection Ratio

The common-mode rejection ratio (CMRR) of an amplifier is a measure of how well the device rejects unwanted

input signals common to both input leads. It is found by taking the ratio of the change in input offset voltage to

the change in the input voltage and converting to decibels. Ideally the CMRR is infinite, but in practice, amplifiers

are designed to have it as high as possible. The CMRR of the NE5534 and SA5534 devices is 100 dB.

8.3.4 Unity-Gain Bandwidth

The unity-gain bandwidth is the frequency up to which an amplifier with a unity gain may be operated without

greatly distorting the signal. The NE5534 and SA5534 devices have a 10-MHz unity-gain bandwidth.

8.3.5 External Compensation Capability

Frequency compensation with a capacitor may be used to increase the gain-bandwidth product (GBW) of the

amplifier. See the Application and Implementation section for more details on design techniques.

8.4 Device Functional Modes

The NE5534 and SA5534 devices are powered on when the supply is connected. Each of these devices can be

operated as a single supply operational amplifier or dual supply amplifier depending on the application.

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Product Folder Links: NE5534 NE5534A SA5534 SA5534A