MAX3624A Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Low-Jitter, Precision Clock Generator with Four Outputs

19-5005; Rev 0; 10/09
EVAALVUAAILTAIOBNLEKIT
Low-Jitter, Precision Clock Generator
with Four Outputs
General Description
The MAX3624A is a low-jitter, precision clock generator
optimized for networking applications. The device inte-
grates a crystal oscillator and a phase-locked loop
(PLL) clock multiplier to generate high-frequency clock
outputs for Ethernet, Fibre Channel, SONET/SDH, and
other networking applications.
Maxim’s proprietary PLL design features ultra-low jitter
(0.36ps_RMS) and excellent power-supply noise rejec-
tion, minimizing design risk for network equipment.
The MAX3624A has three LVPECL outputs and one
LVCMOS output. Selectable output dividers and a
selectable feedback divider allow a range of output
frequencies.
Applications
Ethernet Networking Equipment
Fibre Channel Storage Area Network
SONET/SDH Network
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
IN_SEL
MR
Features
♦ Crystal Oscillator Interface: 19.375MHz to 27MHz
♦ CMOS Input: 19MHz to 40.5MHz
♦ Output Frequencies
Ethernet: 62.5MHz, 125MHz, 156.25MHz,
312.5MHz
Fibre Channel: 106.25MHz, 159.375MHz,
212.5MHz, 318.5MHz
SONET/SDH: 77.76MHz, 155.52MHz, 311.04MHz
♦ Low Jitter
0.14ps_RMS (1.875MHz to 20MHz)
0.36ps_RMS (12kHz to 20MHz)
♦ Excellent Power-Supply Noise Rejection
♦ No External Loop Filter Capacitor Required
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3624AETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagram
BYPASS
SELA[1:0]
REF_IN
27pF
X_IN
X_OUT
33pF
SELA[1:0]
SELB[1:0]
FB_SEL[1:0]
BYPASS
RESET LOGIC/POR
RESET
LVCMOS
0
PFD
1
CRYSTAL
OSCILLATOR
DIVIDERS:
M = 16, 24, 25, 32
NA = 1, 2, 3, 4, 5, 6, 8, 10, 12
NB = 1, 2, 3, 4, 5, 6, 8, 10, 12
0
620MHz TO 648MHz
FILTER
VCO
1
RESET
DIVIDER
M
MAX3624A
DIVIDER
NA
RESET
LVCMOS
BUFFER
LVPECL
BUFFER
RESET
DIVIDER
NB
LVPECL
BUFFER
LVPECL
BUFFER
QAC_OE
QA_C
QA_OE
QA
QA
QB1_OE
QB1
QB1
QB0_OE
QB0
QB0
FB_SEL[1:0]
SELB[1:0]
________________________________________________________________ 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.