Rainbow Electronics MAX3673 - Manual

MAX3673
Low-Jitter Frequency Synthesizer
with Selectable Input Reference
________________________________________________________________ Maxim Integrated Products 1
19-4442; Rev 0; 2/09
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.
EVALUATION KIT
AVAILABLE
General Description
The MAX3673 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 wire-
less base-station applications.
The MAX3673 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
3G Wireless Base Stations
Frequency Translation
Jitter Cleanup
Clock Distribution
Features
♦ Two Reference Clock Inputs: LVPECL
♦ Nine Phase-Aligned Clock Outputs: LVPECL
♦ Input Frequencies: 61.44MHz,122.88MHz,
245.76MHz, 307.2MHz
♦ Output Frequencies: 61.44MHz, 122.88MHz,
153.6MHz, 245.76MHz, 307.2MHz
♦ 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
MAX3673ETN+ -40
°C to +85°C 56
TQFN-EP*
SIGNAL QUALIFIER
AND
LOCK DETECT
POWER-ON
RESET
(POR)
IN0FAIL
IN1FAIL
LOCK
REFCLK0
REFCLK0
FB_IN FB_SEL FB_IN
REFCLK1
REFCLK1
MR
0
1
1
0 DIV M
DM SEL_CLK DA
DB
PFD CP
DIV N
DIV A
DIV B
VCO
2.457GHz 61.44MHz
OUTA2
OUTA2
OUTA1
OUTA1
OUTA3
OUTA3
OUTA0
OUTB_EN
OUTA0
OUTA_EN PLL_BYPASS
1
0
1 0
OUTB3
OUTB3
OUTB2
OUTB2
OUTB4
OUTB4
OUTB1
OUTB1
OUTB0
OUTB0
C PLL
0.1 μF
C REG
0.22 μF
MAX3673
Functional Diagram
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configuration and Typical Application Circuits appear at
end of data sheet.