Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Class D
Output Type:	4-Channel (Quad)
Max Output Power x Channels @ Load:	150W x 4 @ 2 Ohm
Voltage - Supply:	4.5 V ~ 26.4 V
Features:	Depop, Short-Circuit and Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TA)
Supplier Device Package:	56-HSSOP
Package / Case:	56-PowerBSSOP (0.295", 7.50mm Width)

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TAS6424QDKQQ1 Application Field and Working Principle

Introduction

The TAS6424QDKQQ1 is a high-performance audio amplifier from Texas Instruments, broadly used in audiophile and professional applications. This application note provides an overview of its audio capabilities, as well as its application field and basic working principle.

Application Field

The TAS6424QDKQQ1 variable gain amplifier (VGA) is specifically designed for audio applications. It is used in audio and sound-processing systems such as surround sound receivers, audiophile systems, speakers, audio amplifiers, studio and broadcast systems. The TAS6424QDKQQ1 supports both single-ended and differential inputs, provide an adjustable gain and can even drive low impedance headphones directly. Thanks to its two fully-differential signal paths and stereo Cascode input structure, its performance is excellent in terms of audio signal paths.In terms of power supply, the TAS6424QDKQQ1 provides its own reverse voltage protection and can accept a wide supply range from 7V to 18V.

Working Principle

At the heart of the TAS6424QDKQQ1 is an amplifier with differential inputs and outputs, based on Texas Instruments’ proprietary VIPower (Very Low-Power Intense) technology. This technology enables very low power consumption of the amplifier and also helps reduce unwanted noise.The amplifier has three basic parts: the input stage, the output stage, and the gain/attenuation control. The input section contains dual differential input stages and a single-ended input stage with programmable gain. The output stage consists of two transistors with a common current source, and it is capable of driving low impedance headphones directly or buffered outputs. The gain and attenuation in the amplifier are programmed via two registers (0 and 1) inside the TAS6424QDKQQ1. The gain is adjustable in 64 steps of 0.0625 dB increments over the span of 0 dB to 24 dB. And the attenuation is adjustable in 64 steps of 0.125 dB increments over the span of 0 dB to -16 dB.

Conclusion

The TAS6424QDKQQ1 is a high-performance amplifier suitable for use in professional audio applications or audiophile systems. It is based on Texas Instruments’ VIPower Technology, providing excellent audio performance in terms of both low power consumption and noise reduction. It supports a wide range of input formats, including single-ended and differential, as well as buffered and low-impedance headphones. Additionally, its attenuation and gain can be adjusted using the registers inside the amplifier, with the span covering 0 dB to 24 dB for gain and 0 dB to -16 dB for attenuation.

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