Analog Audio Amplifier Front-end Reference Design with Improved Noise and Distortion
Description
The Analog Audio Amplifier Front-end Reference Design demonstrates how to build an audio front end for the TPA32xx class-D amplifier. The AUDIO-OPA1632EVM is the board that was designed to test the results of this design. Design files for the board are available in the reference design product folder. This design utilizes a standard Audio Interface Board (AIB) connector to drive two differential audio inputs of a TPA32xx EVM. The audio front end has selectable gains of 0: 6: and 12 dB and converts two single-ended audio signals into two fully differential signals driving the inputs of the TPA32xx. The distortion and noise performance (THD+N ratio) of the audio front end is significantly better than the THD+N ratio of the TPA32xx: which ensures that the audio front end does not degrade the performance of the overall system.
Features
- Single-ended-to-differential conversion with single fully-differential amplifier optimizes THD+N ratioFour parallel connectors for analog inputs: XLR: ¼”-stereo phone: RCA: and SMA jacksGain is adjustable to 0 dB: 6 dB: and 12 dBThe front end accepts differential inputs in addition to single-ended inputs100-kHz bandwidth matching bandwidth of TPA32xx
Applications
- AV receiver
- Oscilloscopes & digitizers
- Wireless speaker
- Aircraft cockpit display
- Interconnect/distribution box
- Battery cell formation & test equipment
- Turntable
- Circuit breaker (ACB
- MCCB
- VCB)
Product Categories
- Amplifiers