MAX3671 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Low-Jitter Frequency Synthesizer with Selectable Input Reference

19-4437; Rev 0; 2/09
EVAALVUAAILTAIOBNLEKIT
Low-Jitter Frequency Synthesizer
with Selectable Input Reference
General Description
The MAX3671 is a low-jitter frequency synthesizer that
accepts two reference clock inputs and generates nine
phase-aligned outputs. The device features 40kHz jitter
transfer bandwidth, 0.3ps_RMS (12kHz to 20MHz) inte-
grated phase jitter, and best-in-class power-supply
noise rejection (PSNR), making it ideal for jitter clean-
up, frequency translation, and clock distribution in
Gigabit Ethernet applications.
The MAX3671 operates from a single +3.3V supply and
typically consumes 400mW. The IC is available in an
8mm x 8mm, 56-pin TQFN package, and operates from
-40°C to +85°C.
Applications
Gigabit Ethernet Routers and Switches
Frequency Translation
Jitter Cleanup
Clock Distribution
Pin Configuration and Typical Application Circuits appear at
end of data sheet.
Features
♦ Two Reference Clock Inputs: LVPECL
♦ Nine Phase-Aligned Clock Outputs: LVPECL
♦ Input Frequencies: 62.5MHz,125MHz, 250MHz,
312.5MHz
♦ Output Frequencies: 62.5MHz, 125MHz,
156.25MHz, 250MHz, 312.5MHz
♦ 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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3671ETN+
-40°C to +85°C
56 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Functional Diagram
REFCLK0
REFCLK0
REFCLK1
REFCLK1
IN0FAIL
IN1FAIL
LOCK
MR
SEL_CLK
DM
CPLL
0.1μF
0
DIV M
PFD
1
62.5MHz
CREG
0.22μF
CP
VCO
2.5GHz
DA
PLL_BYPASS OUTA_EN
1
DIV A
0
SIGNAL QUALIFIER
AND
LOCK DETECT
POWER-ON
RESET
(POR)
DIV N
1
DIV B
0
MAX3671
1
0
OUTA3
OUTA3
OUTA2
OUTA2
OUTA1
OUTA1
OUTA0
OUTA0
OUTB_EN
OUTB4
OUTB4
OUTB3
OUTB3
OUTB2
OUTB2
OUTB1
OUTB1
OUTB0
OUTB0
FB_SEL FB_IN FB_IN
DB
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.