Maxim Integrated MAX9485
The MAX9485 programmable multiple-output clock generator provides a cost-efficient solution for MPEG-2 audio systems such as DVD players, DVD drives for multimedia PCs, digital HDTV systems, home entertainment centers, and set-top boxes. The MAX9485 accepts an input reference frequency of 27MHz from a crystal or system reference clock. The device provides two buffered clock outputs of 256, 384, or 768 times the chosen sampling frequency (fS) selected through an I 2 C™ interface or hardwired inputs.
| Part No. |
MAX9485 |
| Datasheet |
MAX9485
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| Manufacturer |
 Maxim Integrated |
| Description |
Programmable Audio Clock Generator |
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FEATURES
♦ 27MHz Crystal with ±30ppm Frequency Reference ♦ Two Buffered Output Ports with Multiple Audio Clocks: 256, 384, or 768 Times fS ♦ Supports Standard and Double Sampling Rates (12kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2 kHz, and 96kHz) ♦ I2C Interface or Hardwired Output Clock Selection ♦ Separate Output Clock Enable ♦ Low Jitter Typical 21ps (RMS at 73.728MHz) ♦ No External Components for PLL ♦ Integrated VCXO with ±200ppm Tuning Range ♦ Small Footprint, Thin QFN Package, 4mm x 4mm GENERAL DESCRIPTION
Sampling frequencies of 12kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, or 96kHz are available. The MAX9485 also offers a buffered 27MHz output and an integrated voltage-controlled oscillator (VCXO) that is tuned by a DC voltage generated from the MPEG processor. The use of VCXO allows the audio system clock to lock with the overall system clock. The MAX9485 features the lowest jitter in its class, guaranteeing excellent dynamic performance with audio ADCs and DACs in an MPEG-2 audio system.
