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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3679A Datasheet

Low-Jitter Crystal to LVPECL Clock Generator

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19-4858; Rev 0; 8/09
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
+3.3V, Low-Jitter Crystal to LVPECL
Clock Generator
General Description
The MAX3679A is a low-jitter precision clock generator
with the integration of three LVPECL and one LVCMOS
outputs optimized for Ethernet applications. The device
integrates a crystal oscillator and a phase-locked loop
(PLL) clock multiplier to generate high-frequency clock
outputs for Ethernet applications.
Maxim’s proprietary PLL design features ultra-low jitter
(0.36psRMS) and excellent power-supply noise rejection,
minimizing design risk for network equipment.
Applications
Ethernet Networking Equipment
Pin Configuration appears at end of data sheet.
Features
Crystal Oscillator Interface: 25MHz
CMOS Input: 25MHz
Output Frequencies for Ethernet
62.5MHz, 125MHz, 156.25MHz, 312.5MHz
Low Jitter
0.14psRMS (1.875MHz to 20MHz)
0.36psRMS (12kHz to 20MHz)
Excellent Power-Supply Noise Rejection
No External Loop Filter Capacitor Required
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3679AETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
10.5Ω
0.1μF
0.1μF
0.1μF
0.01μF
0.1μF
+3.3V ±5%
10μF
0.1μF
VCC
VCC
VCCA
MR
REF_IN
VCCO_A
VCCO_B
IN_SEL
QAC_OE
QA_OE
QB0_OE
QB1_OE
MAX3679A
BYPASS
SELA1
SELA0
SELB1
SELB0
RES1
RES0
X_OUT
X_IN
25MHz
(CL = 18pF)
GND
VDDO_A
QA_C
125MHz
36Ω
QA Z0 = 50Ω
QA Z0 = 50Ω
125MHz
QB0 Z0 = 50Ω
QB0 Z0 = 50Ω
312.5MHz
QB1 Z0 = 50Ω
QB1 Z0 = 50Ω
312.5MHz
GNDO_A
33pF 27pF
Z0 = 50Ω
ASIC
ASIC
50Ω 50Ω
(VCC - 2V)
ASIC
50Ω 50Ω
(VCC - 2V)
ASIC
50Ω 50Ω
(VCC - 2V)
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3679A Datasheet

Low-Jitter Crystal to LVPECL Clock Generator

No Preview Available !

+3.3V, Low-Jitter Crystal to LVPECL
Clock Generator
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range VCC, VCCA,
VDDO_A, VCCO_A, VCCO_B ................................-0.3V to +4.0V
Voltage Range at REF_IN, IN_SEL,
SELA[1:0], SELB[1:0], RES[1:0],
QAC_OE, QA_OE, QB0_OE, QB1_OE,
MR, BYPASS ..........................................-0.3V to (VCC + 0.3V)
Voltage Range at X_IN Pin ...................................-0.3V to +1.2V
Voltage Range at GNDO_A...................................-0.3V to +0.3V
Voltage Range at X_OUT ............................-0.3V to (VCC - 0.6V)
Current into QA_C ...........................................................±50mA
Current into QA, QA, QB0, QB0, QB1, QB1 .....................-56mA
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) .......2759mW
Operating Junction Temperature Range ...........-55°C to +150°C
Storage Temperature Range .............................-65°C to +160°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless other-
wise noted.) (Notes 1, 2, and 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
Power-Supply Current
ICC (Note 4)
CONTROL INPUT CHARACTERISTICS
(SELA[1:0], SELB[1:0], IN_SEL, QAC_OE, QA_OE, QB1_OE, QB0_OE, MR, BYPASS Pins)
Input Capacitance
Input Pulldown Resistor
Input Logic Bias Resistor
CIN
RPULLDOWN Pin MR
RBIAS Pins SELA[1:0], SELB[1:0], QB0_OE
Input Pullup Resistor
RPULLUP
Pins QAC_OE, QA_OE, QB1_OE, IN_SEL,
BYPASS
LVPECL OUTPUT SPECIFICATIONS (QA, QA, QB0, QB0, QB1, QB1 Pins)
Output High Voltage
TA = 0°C to +85°C
VOH
TA = -40°C to 0°C
VCC -
1.13
VCC -
1.18
Output Low Voltage
TA = 0°C to +85°C
VOL
TA = -40°C to 0°C
VCC -
1.85
VCC -
1.90
Peak-to-Peak Output-Voltage
Swing (Single-Ended)
(Note 2)
0.6
Clock Output Rise/Fall Time
Output Duty-Cycle Distortion
20% to 80% (Note 2)
PLL enabled
PLL bypassed (Note 5)
200
48
40
LVCMOS/LVTTL INPUT SPECIFICATIONS
(SELA[1:0], SELB[1:0], IN_SEL, QAC_OE, QA_OE, QB1_OE, QB0_OE, MR, BYPASS Pins)
Input-Voltage High
Input-Voltage Low
VIH
VIL
2.0
TYP
77
2
75
50
75
VCC -
0.98
VCC -
1.7
0.72
350
50
50
MAX
100
VCC -
0.83
VCC -
0.83
VCC -
1.55
VCC -
1.55
0.9
600
52
60
0.8
UNITS
mA
pF
k
k
k
V
V
VP-P
ps
%
V
V
2 _______________________________________________________________________________________


Part Number MAX3679A
Description Low-Jitter Crystal to LVPECL Clock Generator
Maker Maxim Integrated Products
Total Page 11 Pages
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