Audio amplifier chips are used in circuits used to process audio signals.
Class A devices feature a design in which the output stage passes current at all times, even when the input stage is idle.
Class B devices do not pass current when the output device is idle.
Class AB audio amplifier chips combine Class A and Class B operation.
Class C designs are used for radio frequency (RF) transmission.
Class D designs have output devices that are switched on and off at least twice per cycle.
Class E, Class F, Class G, and Class H audio amplifier chips are also commonly available.
Single in-line package (SIP)
Dual in-line package (DIP)
Ceramic DIP (CDIP)
Plastic DIP (PDIP)
Small outline IC (SOIC)
Shrink small outline package (SSOP)
Small outline package (SOP)
Chip scale or chip size package (DSP)
Mini small outline plastic package (MSOP)
Small outline transistor (SOT)
Power small outline package (PSOP)
Thin shrink small outline L-leaded package (TSSOP)
Quarter size outline package (QSOP)
Plastic leaded chip carrier (PLCC)
Audio amplifiers carry performance specifications such as operating temperature, output power, supply voltage, and supply current.
Total harmonic distortion (THD) is also an important consideration. With audio amplifier chips, TDH is a measure of the purity of a signal. This value is defined as the ratio of the sum of the powers of harmonic components to the power of the fundamental.
Bandwidth, another important consideration, refers to the ability of an audio amplifier chip to provide a maximum output voltage swing with increasing frequency.
Features are an important consideration when selecting audio amplifier chips. Some products have an embedded reference voltage or on-chip protection against electrostatic discharge (ESD). Others feature rail-to-rail output or rail-to-rail input. Single supply devices can operate with only one power supply. Audio amplifier chips with an embedded control circuit shut down the device when the temperature exceeds a predefined limit. Audio amplifier chips with embedded current limiters are also commonly available.
In Europe, ICs must meet the requirements of the Restriction of Hazardous Substances (RoHS) directive.
CEA-490 - This standard defines test conditions and test measurement procedures for determining various performance characteristics of single-channel and multi-channel power amplifiers, pre-amplifiers, integrated amplifiers, receivers, and tuner/pre-amplifiers that use AC mains power.
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Amplifier and Comparator Chips
Amplifier and comparator chips are board-level components for amplifying voltage, current, or power.
Analog comparators are amplifiers that compare the magnitude of voltages at two inputs. An analog comparator is an operational amplifier with negative feedback removed, and with no feedback and very high gain, the output voltage goes to one extreme to the other.
Buffer amplifiers have unity gain. They are used to match impedances between two devices, or as isolators.
Current Sense Amplifiers
Current sense amplifiers are integrated circuits with operational amplifiers and sense resistors that are used in measuring the amplitude and direction of current in circuits.
Differential Amplifier Chips
Differential amplifier chips are designed to amplify the difference between two input signals. They can amplify a small difference between two signal levels and ignore any common level shared between them.
Instrumentation Amplifier Chips
Instrumentation amplifier chips are precision amplifier circuits with both high-impedance differential inputs and high common-mode rejection.
Isolation amplifiers electrically isolate input and output signals, often by inductive couplings. Isolation amplifiers, or iso-amps as they are sometimes called, may be used to protect components from potentially dangerous voltages or to amplify low-level analog signals in applications with multiple channels.
Operational amplifiers (op amps, op-amps) are general-purpose, closed-loop devices that are used to implement linear functions.
Power Operational Amplifiers
Power operational amplifiers (POA) are used to increase the power of low-level signals in applications that drive low impedances or reactive loads. They dissipate excess energy as heat, deliver extensive current, and can sustain relatively high supply voltages.
PWM Amplifier Chips
Pulse width modulated (PWM) amplifier chips generate a current that switches between high and low output levels. PWM amplifiers have a much higher power capability for a given volume than linear amplifiers. They are also less expensive.