TI TPA6140A2 Class G stereo headphone amplifier circuit design
TI's TPA6140A2 and TPA6141A2 are 25mW Class G stereo headphone amplifiers, and their system-level music playback time is 20% higher than that of Class AB amplifiers. These two devices use DirectPath technology and do not require large DC blocking capacitors and switch suppression circuits , Enhances the hearing effect. The small package, ultra-low power consumption and high-quality audio fidelity make them very suitable for handheld device applications such as mobile phones / smartphones and MP3 players. This article introduces the main features and indicators of TPA6140A2 and TPA6141A2, functions Block diagram and differential input, single-ended input application configuration diagram. In addition, the main characteristics of the evaluation module, detailed circuit and list of components used are introduced.
TPA6140A2: CLASS-G DIRECTPATH ​​STEREO HEADPHONE AMPLIFIER WITH I2C VOLUME CONTROL
TI's new TPA6140A2 and TPA6141A2 25-mW Class-G stereo headphone amplifiers improve system-level music playback TIme by 20 percent over Class-AB technology in the best-in-class music phones shipping today. DirectPath technology eliminates the need for large DC- blocking capacitors and pop-suppression circuitry improves the listening experience. Small package size, ultra-low power consumption and high audio fidelity makes these devices ideal for portable applications such as mobile / smart phones and MP3 players.
TPA6140A2 main indicators:
TPA6140A2 main features:
Consume 0.6-mA / channel quiescent current and deliver 5 mW / channel into a 32-Ω load, while keeping the total supply current below 5 mA
Enable energy-efficient system when coupled with TI's low-power audio converters, speaker amplifiers, OMAP 3 processors and TMS320C550x and TMS320C540x devices
Variable and fixed gain options:
TPA6140A2: –59-dB to + 4-dB variable gain range programmable via a 32-step I2C volume control
TPA6141A2: 0-dB or + 6-dB fixed gain
Separate SGND pin reduces ground loop noise when interfacing with a non-headphone accessory
Key Applications:
Mobile / smart phones
Portable media / MP3 players
TPA6140A2 Evaluation Module (EVM)
The TPA6140A2 is a DirectPath Class-G stereo headphone amplifier with a built-in I2C volume control. Class-G technology maximizes battery life by adjusting the voltage supplies of the headphone amplifier based on audio signal level. DirectPath eliminates external DC-blocking capacitors. Availability in a 0.4 mm pitch WCSP package makes TPA6140A2 an ideal choice for both cellular handsets and PDAs.
The TPA6140A2 evaluation module (EVM) is a complete, stand-alone audio board. It contains the TPA6140A2 WCSP (YFF) Class-G stereo headphone amplifier.
The TPA6140A2YFFEVM allows the engineer to evaluate the TPA6140A2, a stereo Class-G DirectPath (capacitor-free) headphone amplifier in a WCSP package. The TPA6140A2 has extremely low power consumption that enables much longer battery life in portable applications.
TPA6140A2 evaluation module features:
Highly Power-Efficient Class-G Operation
DirectPath Ground-Referenced Outputs
Power Supply Voltage Range: 2.5 V to 5.5 V
I2C Volume Control: -59 dB to +4 dB Gain Range
Separate SGND Input for Preventing Ground Loop Noise
High Power Supply Rejection Ratio
Differential Inputs for Maximum Noise Rejection
Advanced Pop and Click Suppression Circuitry
High-Impedance Output Mode
Tiny 1.6 mm x 1.6 mm 16-WCSP (0.4mm pitch)
TPA6140A2EVM component list:
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