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MAX3678
Low-Jitter Frequency Synthesizer with Intelligent Dynamic Switching
Industry's Best Jitter Performance Exceeds SerDes Reference Clock Specification
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Status
Active: Data sheet on request only
Description
The MAX3678 is a low-jitter frequency synthesizer with intelligent dynamic clock switching optimized for systems where redundant clock failover switching is needed. It contains a monolithic phase-locked loop (PLL) that accepts two reference clock inputs and generates nine phase-aligned outputs. The device continuously monitors the signal status for both reference clock inputs. In the event that the primary clock fails, the PLL automatically switches to the secondary clock input without generating a phase bump at the clock outputs, using a glitchless switchover mechanism. A manual switch mode is also provided for user-controlled switching. The device features ultra-low jitter generation of 0.3psRMS (integrated 12kHz to 20MHz) and excellent power-supply noise rejection.
The MAX3678 operates from a single +3.3V supply and typically consumes 400mW. The operating temperature range is from 0°C to +85°C, and is available in a 8mm x 8mm, 56-pin TQFN package.
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Data Sheet
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An evaluation kit is available: MAX3678EVKIT
Key Features
- Two Reference Clock Inputs: LVPECL
- Nine Phase-Aligned Clock Outputs: LVPECL
- Automatic or Manual Dynamic Switching Between Two Reference Clock Inputs
- Input Frequencies: 66.67MHz, 133.33MHz, 266.67MHz, 333.33MHz
- Output Frequencies: 66.67MHz, 133.33MHz, 266.67MHz, 333.33MHz
- Low-Jitter Generation: 0.3psRMS (12kHz to 20MHz)
- Clock Failure Indicator for Both Reference Clocks
- External Feedback Provides Zero-Delay Capability
- Low Output Skew: 20ps Typical
- Typical Power Dissipation: 400mW at +3.3V
- Operating Temperature: 0°C to +85°C
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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 |
| MAX3678 |
General Purpose |
66.67 |
333.33 |
66.67 |
333.33 |
Fixed |
LVPECL |
9 |
1 |
Pin |
No |
0.28 |
3.3 |
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$15.10 @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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Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX3678UTN+
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Active: Data sheet on request only |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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0°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3678UTN+T
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Active: Data sheet on request only |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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0°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
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Information Index
Document Ref.: 19-4115
Rev 0;
2008-05-23
This page last modified: 2008-09-12
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