RN4901(T5L,F,T)

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The RN4901(T5L,F,T) is an audio amplifier array designed for pre-biasing applications. Pre-biasing is a method of setting each amplifier within the array to a given operating level and then regulating it, with the goal of achieving uniform and peak performance across the array. RN4901(T5L,F,T) consists of eight independent, open-collector, bipolar junction transistors (BJTs) configured as pre-biased audio amplifiers. By using pre-biased audio amplifiers, a high level of gain uniformity and performance can be achieved.

The RN4901(T5L,F,T) is a single-ended amplifier array operating in parallel with a shared common emitter. The common emitter is connected to the power supply while each of the eight amplifiers are connected to their respective emitters. Each amplifier has its own emitter current, determined by the DC current (IDC) requirements of the amplifier. The output of the amplifiers is independently regulated by an on-chip voltage regulator and a set of external resistors. The amplifiers are capable of delivering a wide-ranging output based on the level of input signal, from high powered audio signals to low powered music signals. The amplifier has an operating temperature range of -95 °C to +105 °C and its operating voltage range is from -32 V to +32 V.

The RN4901(T5L,F,T) utilizes a current-series differential input for amplification. This input stage is designed to be driven by a variety of audio sources and allows for better matching of the amplifier\'s gain to the source impedance. The amplifier is configured as an open-collector device, which eliminates the need for complex current-sourcing circuitry. To reduce noise and increase stability, the amplifier also incorporates a Miller-Compensation stage. This stage consists of an input transistor, which is connected to the source and acts as an emitter follower, and two compensation transistors, which increase the output impedance and stability of the amplifier at high frequencies.

In addition to its wide operating range, the RN4901(T5L,F,T) is also power efficient. The amplifier can operate from a single 12-V supply, and is designed to deliver low power dissipation. The amplifier also contains an on-chip thermal shutdown circuit, which will disable the amplifier if the die temperature exceeds 125 °C. This eliminates the need for external thermal protection devices and reduces power waste.

The pre-biasing technique employed by the RN4901(T5L,F,T) is based on the concept of "forced matching." Forced matching involves connecting the emitters of all eight amplifiers to a single common emitter, and then applying a DC offset current that is equal to the desired magnitude of the output voltage of the amplifier. The DC offset current is derived from the power supply, using a controllable resistor network. This arrangement ensures that the emitter voltages of all the amplifiers remain equal throughout the operating range.

The RN4901(T5L,F,T) is ideal for use in high-fidelity audio applications, where power efficiency, excellent performance, low noise and wide frequency response are critical. The eight pre-biased amplifiers deliver uniform gain, enhanced signal-to-noise performance, excellent PSRR and dynamic range, and better THD performance than traditional amplifier designs. The amplifier is also well suited for use in high-powered speaker applications, thanks to its high gain, low power dissipation and compact size. Applications such as recording systems, microphone amplifiers and sound reproduction systems can all benefit from the features of the RN4901(T5L,F,T) pre-biased audio amplifier array.

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