MAX3678 Datasheet, PDF (1/2 Pages) Maxim Integrated Products – Low-Jitter Frequency Synthesizer with Intelligent Dynamic Switching

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Maxim > Products > [Optoelectronics] [Storage Products (SAS/SATA/Enclosure Management)]
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: In Production.
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
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(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
z Two Reference Clock Inputs: LVPECL
z Nine Phase-Aligned Clock Outputs: LVPECL
z Automatic or Manual Dynamic Switching Between Two Reference Clock Inputs
z Input Frequencies: 66.67MHz, 133.33MHz, 266.67MHz, 333.33MHz
z Output Frequencies: 66.67MHz, 133.33MHz, 266.67MHz, 333.33MHz
z Low-Jitter Generation: 0.3ps_RMS (12kHz to 20MHz)
z Clock Failure Indicator for Both Reference Clocks
z External Feedback Provides Zero-Delay Capability
z Low Output Skew: 20ps Typical
z Typical Power Dissipation: 400mW at +3.3V
z Operating Temperature: 0°C to +85°C
Key Specifications: Clock Generators
Part
Number
f_IN
Applications ^(MHz)
min
f_IN
(MHz)
max
f_OUT
(MHz)
min
f_OUT
(MHz)
max
Fixed or
Continuous
Frequency
Output
Levels
Output
Out-
puts
PLLs
Program-
mability
Spread
Spectrum
Jitter
(ps)
RMS
V_{SUPPLY Package/Pins} ^Price
(V)
See
Notes
MAX3678
General
Purpose
66.67 333.33 66.67 333.33
Fixed
LVPECL 9
1
Pin
No
0.28 3.3
TQFN/56
$14.66
@1k
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Package Information
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5690
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Notes and Comments
Evaluation Kits
11/9/2009