General Description
The DS4625 is a dual-output, low-jitter clock oscillator
capable of producing frequency output pair combina-
tions ranging from 100MHz to 625MHz. The device
combines an AT-cut crystal, an oscillator, and a low-
noise phase-locked loop (PLL) in a 5.0mm x 3.2mm
surface-mount LCCC package. Standard frequency
options are listed in the
Ordering Information/Selector
Guide
table. For custom frequency options, contact the
factory at: Custom.Oscillators@maxim-ic.com.
The DS4625 provides dual, low-voltage, positive emit-
ter-coupled logic (LVPECL) clock output drivers. The
output drivers can be enabled and disabled through
the OE pin, which is an active-high CMOS input that
has an internal pullup resistor. When high, both output
pairs are enabled.
The device operates from a single +3.3V ±10% supply.
The operating temperature range is -40°C to +85°C.
Applications
XGMII Clock Oscillator
InfiniBandTM/SM
SAS/SATA
PCIe®
1GbE/10GbE
Features
♦Standard Clock Output Frequencies: 100MHz,
125MHz, 150MHz, 156.25MHz, and 200MHz
♦Phase Jitter < 0.7ps RMS (typical) from 12kHz to
20MHz
♦LVPECL Output
♦+3.3V ±10% Operating Voltage
♦-40°C to +85°C Temperature Range
♦Excellent Power-Supply Noise Rejection
♦5.0mm x 3.2mm Ceramic LCCC Package
♦Output Enable/Disable
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
19-4558; Rev 1; 3/10
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package. The lead finish is JESD97 category e4 (Au over Ni) and is compatible with both
lead-based and lead-free soldering processes.
*
Standard frequency options. Contact the factory at Custom.Oscillators@maxim-ic.com for custom frequencies.
PART TEMP RANGE
FREQUENCY (OP1:ON1)
(MHz) (fC)*
FREQUENCY (OP2:ON2)
(MHz) (fC)* PIN-PACKAGE TOP
MARK
DS4625P+100/100 -40°C to +85°C 100.000 100.000 10 LCCC 6AA
DS4625P+100/150 -40°C to +85°C 100.000 150.000 10 LCCC 6AC
DS4625P+125/125 -40°C to +85°C 125.000 125.000 10 LCCC 6BB
DS4625P+125/156 -40°C to +85°C 125.000 156.250 10 LCCC 6BD
DS4625P+150/150 -40°C to +85°C 150.000 150.000 10 LCCC 6CC
DS4625P+150/200 -40°C to +85°C 150.000 200.000 10 LCCC 6CE
Pin Configuration and Typical Application Circuit appear at end of data sheet.
InfiniBand is a trademark and service mark of the InfiniBand Trade Association.
PCIe is a registered trademark of PCI-SIG Corp.
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
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.
(All voltages referenced to ground unless otherwise noted.)
Voltage Range on Any Pin Relative to Ground......-0.3V to +4.0V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
θJA ...................................................................+90°C/W (Note 1)
Storage Temperature Range ...............................-55°C to +85°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range VCC 2.97 3.3 3.63 V
Input-Voltage High (OE) VIH 0.7 x
VCC V
CC V
Input-Voltage Low (OE) VIL 0 0.3 x
VCC V
ELECTRICAL CHARACTERISTICS
(VCC = +2.97V to +3.63V, TA= -40°C to +85°C, typical values are at VCC = +3.3V and TA= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ICC_PU LVPECL, output unloaded 65 90 mA
ICC_PL LVPECL, output loaded 120 140 mA
Operating Current
ICC_OEZ V
OE = VIL 80 115 mA
fOUT1
Output Frequency fOUT2
VOE = VIH f
C MHz
Startup Time tSTART (Note 4) 1.0 ms
Frequency Stability fTOTAL/fCTemperature, aging, load, supply, and
initial tolerance (Note 5) -50 +50 ppm
Frequency Stability Over
Temperature with Initial
Tolerance
fTEMP/fC V
CC = +3.3V -35 +35 ppm
Initial Tolerance fINITIAL/fCVCC = +3.3V, TA= +25°C ±20 ppm
Frequency Change Due to VCC fVCC V
CC = +3.3V ±10%, TA= +25°C -3 +3 ppm/V
Frequency Change Due to Load
Variation fLOAD/fC ±10% variation in termination resistance ±1 ppm
Aging (15 Years) fAGING/fC -7 +7 ppm
OE Pullup Resistance RPU T
A= +25°C 70 100 130 k
Note 1: Package thermal resistances were obtained using a two-layer board. For detailed information on package thermal consider-
ations, refer to www.maxim-ic.com/thermal-tutorial.
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
_______________________________________________________________________________________ 3
Note 2: Limits at -40°C are guaranteed by design and are not production tested.
Note 3: AC parameters are guaranteed by design and not production tested.
Note 4: Startup time is from VCC = VCCMIN until PLL locks to the crystal oscillator output.
Note 5: Frequency stability is calculated as: ΔfTOTAL = ΔfTEMP + ΔfVCC x (3.3 x 10%) + ΔfLOAD + ΔfAGING.
Note 6: Supply-induced jitter is the deterministic jitter as measured on a LeCroy SDA11000 measured with a 50mVP-P sine wave
forced on VCC.
SINGLE-SIDEBAND PHASE NOISE
SSB PHASE NOISE (dBc/Hz) (TYPICAL, +25°C, +3.3V)
OFFSET fC = 100MHz fC = 125MHz fC = 150MHz fC = 156.25MHz fC = 200MHz UNITS
100Hz -71 -85 -84 -79 -85
1kHz -116 -117 -116 -115 -113
10kHz -119 -118 -116 -117 -113
100kHz -126 -125 -122 -123 -120
1MHz -143 -142 -141 -140 -139
10MHz -151 -149 -149 -148 -149
20MHz -151 -150 -149 -149 -150
dBc/Hz
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.97V to +3.63V, TA= -40°C to +85°C, typical values are at VCC = +3.3V and TA= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output High Voltage VOH Output connected to 50 at PECL_BIAS at
VCC - 2.0V
VCC -
1.085
VCC -
0.88 V
Output Low Voltage VOL Output connected to 50 at PECL_BIAS at
VCC - 2.0V
VCC -
1.825
VCC -
1.62 V
Differential Output Voltage |VOD|Output connected to 50 at PECL_BIAS at
VCC - 2.0V 0.595 0.710 V
Output Rise Time tR 20% to 80% 200 ps
Output Fall Time tF 80% to 20% 200 ps
Duty Cycle DCYCLE 45 55 %
Propagation Delay from OE
Going Low to Output High
Impedance
tPAZ (See Figure 2) 100 ns
Propagation Delay from OE
Going High to Output Active tPZA (See Figure 2) 100 ns
Jitter JRMS Integrated phase RMS, 12kHz to 20MHz,
VCC = +3.3V, TA= +25°C 0.7 ps
Accumulated Deterministic
Jitter Due to Reference Spurs
125.00MHz output, VCC = +3.3V,
TA= +25°C 0.1 ps
10kHz 12.9 ps
100kHz 26.3 ps
200kHz 20.1 ps
Accumulated Deterministic
Jitter Due to Power-Supply Noise
(P-P) (Note 6)
1MHz 6.4 ps
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
4 _______________________________________________________________________________________
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
fC DEVIATION vs. TEMPERATURE
DS4625 toc01
TEMPERATURE (°C)
DEVIATION (ppm)
6040200-20
-40
-30
-20
-10
0
10
20
30
40
50
-50
-40
fC DEVIATION vs. VCC
DS4625 toc02
VCC (V)
DEVIATION (ppm)
3.63.53.43.33.23.1
0.5
1.0
1.5
2.0
2.5
3.0
0
3.0
ICC vs. VCC
DS4625 toc03
VCC (V)
CURRENT (mA)
3.53.43.33.23.1
60
70
80
90
100
110
120
130
140
50
3.0 3.6
ICC_PU
ICC_PL
ONE OUTPUT LOADED
Pin Description
PIN NAME FUNCTION
1 OE Active-High Output Enable. Has an internal pullup resistor (RPU).
2, 3 GND Ground
4 OP1 Positive Output 1 for LVPECL
5 ON1 Negative Output 1 for LVPECL
6 VCC Supply Voltage Input
A1, A2 N.C. No Internal Connection. Must be connected to ground.
A3 OP2 Positive Output 2 for LVPECL
A4 ON2 Negative Output 2 for LVPECL
— EP
Exposed Pad. The exposed pad must be used for thermal relief. This pad must be connected to
ground.
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
_______________________________________________________________________________________ 5
X1 X0 PLL
X2 PFD LPF
LC-VCO DIV M
DIV P
DIV N
LVPECL
VCC
GND
OE
OP1
ON1
LVPECL
OP2
ON2
DS4625
RPU
VCC
Figure 1. Block Diagram
OE
OP_
tPZA
0.7 x VCC
0.3 x VCC
PECL_BIAS PECL_BIAS
PECL_BIAS PECL_BIAS
ON_
tPAZ
Figure 2. LVPECL Output Timing Diagram When OE is Enabled and Disabled
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
6 _______________________________________________________________________________________
Detailed Description
The DS4625 is a dual-output, low-jitter clock oscillator
that produces frequency output pair combinations as
shown in the
Ordering Information/Selector Guide
table.
The phase relationship between the outputs is not guar-
anteed. The device combines an AT-cut, fundamental-
mode crystal, an oscillator, and a low-noise PLL in a
5.0mm x 3.2mm surface-mount LCCC package.
The DS4625 provides dual LVPECL clock output dri-
vers. The output drivers can be enabled and disabled
through the OE pin. The OE pin is an active-high CMOS
input that has an internal pullup resistor. When OE is
high, both output pairs are enabled.
Chip Information
PROCESS: Bipolar SiGe
Package Information
For the latest package outline information and land patterns,
go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
1
2
3
6
5
4
TOP VIEW
OE
GND
N.C. N.C.
A1 A2
A3 A4
OP2 ON2
GND
VCC
ON1
OP1
+
(5.00mm
×
3.20mm
×
1.49mm)
DS4625
*EP
*EXPOSED PAD
Pin Configuration
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
10 LCCC L1053+H2 21-0389
VCC OP1
ON1
OE
GND
0.01μF
0.1μF
50Ω
50Ω
PECL_BIAS AT VCC - 2.0V
OP2
ON2
50Ω
50Ω
PECL_BIAS AT VCC - 2.0V
DS4625
Typical Application Circuit
DS4625
3.3V Dual-Output LVPECL Clock Oscillator
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
7
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/09 Initial release. —
1 3/10
Changed the operating temperature range limit from +70°C to +85°C, and added a new
part number to the Ordering Information table. 1, 2, 3
