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MAX9485
Programmable Audio Clock Generator
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
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Status
Active: In Production.
Description
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 I²C interface or hardwired inputs. 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. The device operates with a 3.3V supply and is specified over the -40°C to +85°C extended temperature range. The MAX9485 is offered in 6.5mm x 4.4mm 20-pin TSSOP and 4mm x 4mm 20-pin thin QFN packages.
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Data Sheet
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An evaluation kit is available: MAX9485EVKIT
Key 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, 88.2kHz, 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
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Applications/Uses
- Digital TVs
- DVD Players
- Home Entertainment Centers
- Set-Top Boxes HDTVs
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Key Specifications:
| Clock Generators |
| Part Number |
Applications |
fIN
(MHz) |
fIN
(MHz) |
fOUT
(MHz) |
fOUT
(MHz) |
Fixed or Continuous Frequency |
Output Levels |
Out-
puts |
PLLs |
Program-
mability |
Spread Spectrum |
Output Jitter
(ps) |
VSUPPLY
(V) |
Package/Pins |
Budgetary Price |
| min |
max |
min |
max |
RMS |
See Notes |
| MAX9485 |
General Purpose |
5 |
30 |
27 |
27 |
Fixed |
LVCMOS |
3 |
1 |
|
No |
28 |
3.3 |
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$0.88 @1k |
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See All Clock Generators (34)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Application Circuit
More Information
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Information Index
Document Ref.: 19-3315
Rev 0;
2004-08-20
This page last modified: 2010-05-21
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