The PT8211 is a 16-bit dual-channel Digital to Analog converter chip. It is typically a dual-channel DAC designed specifically for digital audio applications. This DAC chip employs CMOS technology. As the name implies, it is 16-bit dependent, and the internal engineering is based on an R-2R resistor ladder network. The R-2R ladder is simply a resistor configuration that converts binary signals to analogue signals.

PT8211 DAC Introduction

PT8211 improved the execution of timing obligations in a digital serial bus as a result. It is made up of a fast switching R-2R network that can handle an audio signal with an 8X oversampling.

It is functionally equivalent to TDA1311 and has a wide range of test frequencies. In the design of the PT8211’s digital timing input format, the Least Significant Bit Justified or Right Justified Input Data Format is used. PT8211’s computerized code architecture prioritizes 2’s complement and the MSB (most significant bit).

Pinout Diagram

PT8211 DAC is available in 8-pin DIP or SOP. The following figure shows pin configuration diagram.

NoNameFunction
1BCKSerial Bit clock input
2WSWord select clock input pin
3DINData input pin
4GNDGround 
5VDDPositive power supply 
6LCHLeft Channel input
7NCNo connection
8RCHRight Channel Output 

Features and Specifications of PT8211

  • A single chip produces two audio channels.
  • CMOS technology is used.
  • Vital range of 16 bits
  • Although suitable for 3.3V, the input level
  • Power consumption is minimal.
  • Total harmonic contortion is low.
  • There is no phase shift in either output channel.
  • Available in 8-pin DIP or SOP.

Alternative options for PT8211 are enumerated below,

  • PCM5252
  • PCM1789
  • PCM1690

Block Diagram of PT8211

Block Diagram of PT8211

PT8211 DAC Working

The schematic for the PT8211, which depicts the level interconnection of the DAC, is shown in the image below. It must be built from fundamental components. There are only a few RC circuits connected to the output of the low pass filter, a few op-amps, and few GND.

PT8211 DAC Working

To further extinguish the remaining noise, a supplementary low pass filter is placed after the analogue output of the PT8211. If low noise output is required for the circuit format, the adjustable power supply can be used.

Timing and Input Signal Format Diagram

The waveforms in the following figures depict the function description of the PT8211. The sequential bus input information architecture of the PT8211 is LSBJ. Each significant DIN information will be transferred to the BCK’s rising edge information register. If the information contains more than 16 bits, only the first 16 bits from the MSB are valid, and the remaining bits are reduced. BCK could exceed 20MHz while maintaining an 8x improvement over testing at a WS clock rate of 48KHz.

The MSB should come first, followed by the DIN data, which should be arranged using the 2’s complement. When the WS clock is low, DIN data is transferred to the appropriate input register. If the WS clock is set to a high level, DIN data will be shifted to the left. A 16-bit R-2R resistor ladder network is used to generate DAC output. The signal is received by the RCH/LCH via the cradle operational amplifier.

Applications of PT8211

  • Recorders
  • MPEG decoder card
  • Multimedia sound card
  • Extensive range of audio-related consumer products
  • Digital audio equipment
  • CD/DVD/MP3 player

2D Model

The 2D model of PT8211 is shown below which displays the top and side view.

Side view:

In summary, PT8211 DAC is appropriate to use in different sound-related applications where DAC is needed for sound generation or transformation-related work. Subsequently, noise issues are limited as PT8211 provides low total harmonic distortion.

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