描述 Description

The PCM1723 is a complete low cost stereo audio digital-to-analog converter (DAC) with a phase-locked loop (PLL) circuit included. The PLL derives either 256fS or 384fS system clock from an external 27MHz reference frequency. The DAC contains a 3rd-order Delta-Sigma () modulator, a digital interpolation filter, and an analog output amplifier. The PCM1723 can accept 16-, 20-, or 24-bit input data in either normal or I2S formats.
The digital filter performs an 8X interpolation function and includes selectable features such as soft mute, digital attenuation and digital de-emphasis. The PLL can be programmed for sampling at standard digital audio frequencies as well as one-half and double sampling frequencies.
The PCM1723 is ideal for applications which combine compressed audio and video data such as DVD, DVD-ROM, set-top boxes and MPEG sound cards.

特性 Features

? ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA
? COMPLETE STEREO DAC: Includes Digital Filter and Output Amp
? DYNAMIC RANGE: 94dB
? MULTIPLE SAMPLING FREQUENCIES:
? 16kHz, 22.05kHz, 24kHz
? 32kHz, 44.1kHz, 48kHz
? 64kHz, 88.2kHz, 96kHz
? PROGRAMMABLE PLL CIRCUIT:
? 256fS/384fS from 27MHz Master Clock
? NORMAL OR I2? DATA INPUT FORMATS
? SELECTABLE FUNCTIONS:
? Soft Mute
? Digital Attenuator (256 Steps)
? Digital De-emphasis
? OUTPUT MODE: Left, Right, Mono, MuteSoundPLUS is a trademark of Texas Instruments. I2S is a trademark of NXP Semiconductors. All other trademarks are the property of their respective owners.