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The new TPA6130A2 is TI's patented charge pump-based headphone amplifier family, the first product in the new DirectPath product line. Because the device provides a direct path between the amplifier and the speaker, it not only simplifies the design of the amplifier, but also reduces cost and space savings by not using DC blocking capacitors. The TPA6130A2 provides a differential input that does not create unwanted common mode noise at the amplifier input.
Nicholas Holland, TI's marketing manager for high-performance simulation, said: "The TPA6130A2 features new DirectPath technology that helps customers improve low-frequency performance and reduce overall solution size. The TPA6130A2 offers a range of features to meet the demanding requirements of the portable audio market."
Maximizing PSRR is critical to sound quality because any noise ripple on the power supply can directly cause audible beeps at the headphone speaker. For example, in the case of a cell phone, other system components, such as radio transmitters, can create noise on the battery power source. High PSRR ensures that the above problems are eliminated and the sound quality is improved.
Conventional headphone amplifiers require large output DC blocking capacitors, which typically require a large amount of board space and high form factor requirements. In order to reduce the size of the solution, manufacturers will use small and low-quality capacitors, but this will affect the low-frequency response of the headphones and limit the overall basic content.
TI's DirectPath charge pump architecture produces a negative supply rail so that the amplifier can be truly referenced, providing a direct path between the amplifier output and the headphone speaker without the need for any DC blocking capacitors. This enables developers to design smaller, smaller headphone driver solutions that improve low frequency response and reduce system cost and PCB space requirements.
The quiescent current of the TPA6130A2 is only 4 mA, which is the lowest in the industry, and the current is less than 1 uA after shutdown. This high efficiency allows developers to design headphones that have the longest battery life and listening time.
Cost is an important factor to consider in headset design. TI has integrated volume control in the TPA6130A2, eliminating the need for an additional potentiometer to control the volume. Since the 64-level volume control is implemented in software via the I2C control bus, it also provides the added benefit of maximizing the headphone signal-to-noise ratio (SNR). Because the volume control is implemented in software, developers can drive the audio source with maximum output and boost the volume inside the amplifier for maximum SNR and best sound quality.
TI is committed to maximizing the user experience as much as possible, and by using the high-performance transient noise suppression circuitry in the TPA6130A2, the instantaneous noise is reduced to an unspeakable level. Other features of the device include 138 mW per channel for standard 16 ohm headphone speakers at 5 V, 0.0055% THD+N (35 mW at 1 KHz), and 8 kV ESD protection. . The device also supports a wide voltage range of 2.5 V to 5.5 V, so developers can connect the headphone amplifier directly to the power supply without the need for a dedicated power management device such as a low-dropout regulator (LDO), simplifying the overall design.
The TPA6130A2 works with a range of high-performance analog and DSP products in TI's portable audio signal chain, including DSPs, audio data converters, clocks, Class D audio power amplifiers, and audio codecs. TI provides silicon technology, software, system technology and support to help customers accelerate their time to market.
The TPA6130A2 is available now in volume production and is available in a leadless 2 mm x 2 mm WCSP package and is priced at $1.55 per unit in 1,000-unit quantities. TI plans to introduce evaluation boards and related software in a 4 mm x 4 mm QFN package in early 2007.
