QuickView - MAX3678 Low-Jitter Frequency Synthesizer with Intelligent Dynamic Switching
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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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Active: In Production.
Description
The MAX3678 is a low-jitter frequency synthesizer with intelligent dynamic clock switching optimized for
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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 0.3ps
RMS
(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.
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: 0.3ps
RMS
(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
Key Specifications: Clock Generators
f
IN
f
OUT
f
OUT
f
IN
(MHz) (MHz) (MHz) (MHz)
min
MAX3678
General
Purpose
max
min
max
Output
Price
Jitter
Fixed or
V
SUPPLY
Output Out-
Program- Spread
(ps)
Package/Pins
Continuous
PLLs
Levels puts
mability Spectrum
(V)
Frequency
See
RMS
Notes
Fixed
LVPECL
9
1
Pin
No
0.28
3.3
Part
Applications
Number
66.67 333.33 66.67 333.33
TQFN/56
$14.66
@1k
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Notes and Comments
Evaluation Kits
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5690
11/9/2009
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