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The PCM1727 is a complete low cost stereo audiodigital-to-analog converter (DAC) with a dual phase-locked loop (PLL) circuit included. PLL-1 derives afixed 33.8688MHz (768fS, fS = 44.1kHz) systemclock (SCKO-1), and PLL-2 derives both the 384fS (fS= 44.1k/48k/96kHz) system clock (SCKO-2), and the768fS (fS = 44.1k/48kHz)/384fS (fS = 96kHz) systemclock (SCKO-3) from an external 27MHz referencefrequency. The DAC contains a 3rd-order ∆ modula-tor, a digital interpolation filter, and an analog outputamplifier. The PCM1727 can accept 16-, 20-, or 24-bitinput data in either normal or I2S formats.
The digital filter performs an 8X interpolation func-tion and includes selectable features such as soft mute,digital attenuation and digital de-emphasis.
The PCM1727 is ideal for applications which combinecompressed audio and video data such as DVD, DVDAudio with CD-DA compatibility, karaoke DSP.
PCM1727 Maximum Ratings
Power Supply Voltage ....................................................................... +6.5V +VCC to +VDD Difference ................................................................... ±0.1V Input Logic Voltage .................................................. 0.3V to (VDD + 0.3V) Input Current (except power supply) .............................................. ±10mA Power Dissipation ............................................................................ 300mW Operating Temperature Range ........................................25°C to +85°C Storage Temperature ................................................... 55°C to +125°C Lead Temperature (soldering, 5s) .................................................. +260°C Thermal Resistance, JA ............................................................... +70°C/W
PCM1727 Features
ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA COMPLETE STEREO DAC: Includes DigitalFilter and Output Amp DYNAMIC RANGE: 92dB MULTIPLE SAMPLING FREQUENCIES:fS = 44.1kHz, 48kHz, 96kHz PROGRAMMABLE DUAL PLL CIRCUIT:27MHz Master Clock Input GENERATED SYSTEM CLOCKSCKO1: 33.8688MHzSCK02: 384fSSCK03: 768fS (44.1k/48kHz)384fS (96kHz) NORMAL OR I2S DATA INPUT FORMATS SELECTABLE FUNCTIONS:Soft Mute, Analog Output ModeDigital Attenuator (256 Steps)Digital De-emphasis +5V SINGLE POWER SUPPLY