6 Detailed Description

6.1 Overview

The RC4580 device is a dual operational amplifier that has been designed optimally for audio applications, such

as improving tone control. The device offers low noise, high gain bandwidth, low harmonic distortion, and high

output current. When high output current is required, the RC4580 device can be used as a headphone amplifier.

Due to the wide operating supply voltage of the device, the RC4580 device can also be used in low-voltage

applications.

6.2 Functional Block Diagram

6.3 Feature Description

6.3.1 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 RC4580 device has a 12MHz unity-gain bandwidth.

6.3.2 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. The CMRR is found by taking the ratio of the change in input offset

voltage to the change in the input voltage, then converting to decibels. Ideally the CMRR is infinite, but in

practice, amplifiers are designed to have the CMRR as high as possible. The CMRR of the RC4580 device is

110dB.

6.3.3 Slew Rate

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

on the input. The RC4580 device has a 5V/µs slew rate.

6.4 Device Functional Mode

The RC4580 device is powered on when the supply is connected. Each device can operate as a single-supply

operational amplifier or dual-supply amplifier depending on the application.

RC4580

SLOS412E – APRIL 2003 – REVISED NOVEMBER 2024

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