2.1 Channel Audio Processor with Subwoofer Output

This board is an Audio Processor built using PT2033 chip audio processor designed for versatile applications. It includes 3 stereo input selectors with internal gain and master volume control with low-frequency loudness compensation. It is capable of individual channel output volume adjustment and also tone control.

The PT2033 is 2.1 CH Audio Processor with I²C bus interface. The IC is also a sound processor that includes all of the functions required to process the audio signal for TV & Mini Compo, such as Tone control, Volume, Mute, Balance, Loudness, 3 Stereo inputs selector, 1 Stereo output, and 1 Subwoofer out are all built into a single chip to provide Audio system having the highest audio performance and reliability. If a system wants subwoofer signal output, a traditional solution needs a lot of discrete components and OPAMPs to consist of a low pass filter; the PT2033, only needs 2 external capacitors. The PT2033 combines the low pass filter inside the audio processor and the user may determine low pass corner frequency by the capacitance. A broader supply range emphasizes support to every application.

Features

• Wide operation range (VDD from 4V to 10V)
• Controlled by I²C interface
• 3 Stereo Inputs with gain selection.
• Screw Terminals for Easy Inputs and Outputs connections
• Header Connector for Power Supply Input
• Input gain range, from 0dB to +11.25dB, 3.75dB per step
• 2 channels master volume: from 0 dB to -78.75dB, 1.25dB per step
• Built In channel mixer and lowpass filter for subwoofer output
• Subwoofer output volume: from 0dB to -37.5dB, 1.25dB per step
• Tone control (Bass and Treble): from -14dB to +14dB, 2dB per step
• Low harmonic distortion (0.002%, Vo=200mVrms)
• Low noise and DC offset
• On Board Power LED
• 4 x 3MM Mounting Holes
• PCB Dimensions 65.41 x 43.18 mm

Connections

• CN1: Pin 1 = Audio Input Left 1, Pin 2 = Audio Input Left 2, Pin 3 = Audio Input Left 3, Pin 4 = GND
• CN2: Pin 1 = Audio Input Right 1, Pin 2 = Audio Input Right 2, Pin 3 = Audio Input Right 3, Pin 4 = GND
• CN3: Pin 1 = Audio Output Left Channel, Pin 2 = GND
• CN4: Pin 1 = Audio Output Right Channel, Pin 2 = GND
• CN5: Pin 1 = Audio Output Subwoofer, Pin 2 = GND
• CN6: Pin 1 NC, Pin 2 = SCL-I2C, Pin 3 = SDA-I2C, Pin 4 = GND
• CN7: Pin 1,2 = VDD , Pin 3,4 = GND
• D1: Power LED

Application Diagram

Block Diagram

Schematic

Parts List

Connections

Gerber View

Photos

PT2033 Datasheet

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