PCM1704U-K/2K

Series:	SoundPlus™
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	DAC, Audio
Number of Channels:	2
Resolution (Bits):	24 b
Sampling Rate (Per Second):	96k
Data Interface:	Serial
Voltage Supply Source:	Dual ±
Voltage - Supply:	±5V
Operating Temperature:	-25°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	20-SO
Base Part Number:	PCM1704

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PCM1704U-K/2K Application Field and Working Principle

The PCM1704U-K/2K is an integrated circuit (IC) combined Analog-to-Digital Converter (ADC) and a Digital-to-Analog Converter (DAC). It is developed by Texas Instruments and has been proven to be one of the most advanced audio ADCs/DACs for reference quality audio applications. The PCM1704U-K/2K is suitable for applications such as digital audio playback from compact discs, digital audio broadcast receivers and digital audio recorders.

Application Field

The PCM1704U-K/2K has been designed with advanced features to meet the requirements of high quality audio applications. It features a high-performance sigma-delta modulator and a low-noise onboard reference. The signal-to-noise ratio is greater than 113dB and the THD+N is better than 0.00013%. The low power consumption and complete system solution offers a high signal-to-noise ratio and wide dynamic range even when operating on a single 3V supply.This IC is suitable for applications such as recording and playback systems and high-end multi-channel audio systems. It can be used in conjunction with a variety of digital audio formats. It is also suitable for use in other audio applications such as playback of high resolution audio or for adding analog audio components to a digital environment.

Working Principle

The PCM1704U-K/2K ADC is based on a dual-mode sigma-delta architecture. The first stage is an oversampling sigma-delta modulator which performs the analog-to-digital conversion with a high signal-to-noise ratio and wide dynamic range. The second stage is a digital filtering stage which performs the decimation and post-correction.The DAC of the PCM1704U-K/2K uses a high-precision interpolation filter to interpolate the digital input signals and then converts them into analog signals with a low noise floor. The DAC can convert up to 192kHz and 24-bit digital input signals.The PCM1704U-K/2K also features a low noise onboard reference to ensure that both the ADC and DAC maintain accurate performance. This reference is based on a voltage controlled oscillator (VCO) which is kept stable by an external crystal oscillator.

Conclusion

The PCM1704U-K/2K is a combination audio ADC/DAC solution from Texas Instruments. It is suitable for a wide range of applications including digital audio playback, recorders and broadcast receivers. The IC features a dual-mode sigma-delta architecture, a low noise onboard reference and a high-precision interpolation filter. It is capable of processing up to 192kHz and 24-bit digital input signals.

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