COST VCXO MK2727 ICS's lowest cost, low-jitter, high-performance

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COST VCXO MK2727 ICS's lowest cost, low-jitter, high-performance

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MK2727
COST VCXO
MK2727 ICS's lowest cost, low-jitter, high-performance VCXO clock synthesizer designed replace expensive 27MHz VCXOs. on-chip Voltage Controlled Crystal Oscillator accepts input voltage cause output clocks vary ±100 ppm. Using ICS's patented VCXO analog Phase-Locked Loop (PLL) techniques, device uses inexpensive external 13.5 pullable crystal input produce output clock. manufactures largest variety Set-Top multimedia clock synthesizers applications. more clock outputs needed, MK2731 MK277x family parts. Consult eliminate VCXOs, crystals oscillators from your board.
Packaged 8-pin narrow SOIC Uses inexpensive 13.500 external crystal On-chip VCXO with pull range
(minimum)
VCXO input tuning voltage output drive capability levels Advanced, low-power, sub-micron CMOS process operating voltage
Block Diagram
13.5 Pullable Crystal
Voltage Controlled Crystal Oscillator
PLL/Clock Synthesis Circuitry
2727 egra
Race Street, Jose, 7-120
Revision 040704
MK2727 COST VCXO
Assignment
8-Pin (150 mil) SOIC
Descriptions
Number
Name
Type
Input Power Input Power Output Power Power Input Connect
Description
Crystal connection. Connect pullable 13.5 crystal. Voltage input VCXO. Zero analog input which controls frequency VCXO. Connect ground. clock output. Connect Connect ground. Crystal connection. Connect pullable 13.5 crystal.
2727 grated Circuit Systems
Race Stree Jose, 97-12
Revision 040704
MK2727 COST VCXO
External Component Selection
MK2727 requires minimum number external components proper operation.
variable load capacitors that "pull" (change) frequency crystal. crystal specified with MK2727 designed have zero frequency error when total on-chip stray capacitance Recommended Crystal Parameters: Initial Accuracy 25°C Temperature Stability Aging Load Capacitance Shunt Capacitance, C0/C1 Ratio Equivalent Series Resistance
Decoupling Capacitor
decoupling capacitor 0.01µF must connected between (pin (pin close these pins possible. optimum device performance, decoupling capacitor should mounted component side PCB. Avoid vias decoupling circuit.
Series Termination Resistor
When trace between clock output (CLK, load over inch, series termination should used. series terminate trace commonly used trace impedance), place resistor series with clock line, close clock output possible. nominal impedance clock output
external crystal must connected close chip possible should same side MK2727. There should vias between crystal pins device pins. There should signal traces underneath close crystal.
Quartz Crystal
MK2727 VCXO function consists external crystal integrated VCXO oscillator circuit. assure best system performance (frequency pull range) reliability, crystal device with recommended parameters (shown below) must used, layout guidelines discussed following section shown must followed. frequency oscillation quartz crystal determined "cut" load capacitors connected MK2727 incorporates on-chip
Crystal Tuning Load Capacitors
crystal traces should include pads small fixed capacitors, between ground, another between ground. need these capacitors determined system prototype evaluation, influenced particular crystal used (manufacture frequency) layout. typical required capacitor value procedure determining value these capacitors found application note MAN05.
2727 grated Circuit Systems
Race Stree Jose, 97-12
Revision 040704
MK2727 COST VCXO
Absolute Maximum Ratings
Stresses above ratings listed below cause permanent damage MK2727. These ratings, which standard values commercially rated parts, stress ratings only. Functional operation device these other conditions above those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect product reliability. Electrical parameters guaranteed only over recommended operating temperature range.
Item
Supply Voltage, Inputs Outputs Ambient Operating Temperature Storage Temperature Soldering Temperature
Rating
-0.5 VDD+0.5 +70°C +150°C 260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured respect GND) Reference crystal parameters
Min.
+4.75
Typ.
Max.
+5.25
Units
Refer page
Electrical Characteristics
VDD=5 Ambient temperature +70°C, unless stated otherwise
Parameter
Operating Voltage Output High Voltage Output Voltage Output High Voltage (CMOS Level) Operating Supply Current Short Circuit Current VIN, VCXO Control Voltage
Symbol
Conditions
load
Min.
4.75
Typ.
Max.
5.25
Units
VDD-0.4 ±100
2727 grated Circuit Systems
Race Stree Jose, 97-12
Revision 040704
MK2727 COST VCXO
Electrical Characteristics
±5%, Ambient Temperature +70° unless stated otherwise
Parameter
Input Crystal Frequncy Input Crystal Accuracy Output Clock Rise Time Output Clock Fall Time Outpu Clock Duty Cycle Maximum Absolute Jitter, short term Output Pullability
Symbol
Conditions
Min.
Typ.
13.500
Max.
Units
Measured Note +100
Note External crystal device must conform with Pullable Crystal Specifications listed page
Thermal Characteristics
Parameter
Thermal Resistance Junction Ambient
Symbol
Conditions
Still flow flow
Min.
Typ.
Max. Units
°C/W °C/W °C/W °C/W
Thermal Resistance Junction Case
2727 grated Circuit Systems
Race Stree Jose, 97-12
Revision 040704
MK2727 COST VCXO
Package Outline Package Dimensions (8-pin SOIC, Mil. Narrow Body)
Package dimensions kept current with JEDEC Publication
Millimeters Symbol Inches
INDEX AREA
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050
SEATING PLANE
(.004)
Ordering Information
Part Order Number
MK2727S MK2727STR MK2727SLF MK2727SLFTR
Marking
MK2727S MK2727S 2727SL 2727SL
Shipping Packaging
Tubes Tape Reel Tubes Tape Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
+70° +70° +70° +70°
"LF" denotes (lead) free package.
While information presented herein been checked both accuracy reliability, Integrated Circuit Systems (ICS) assumes responsibility either infringement patents other rights third parties, which would result from use. other circuits, patents, licenses implied. This product intended normal commercial applications. other applications such those requiring extended temperature range, high reliability, other extraordinary environmental requirements recommended without additional processing ICS. reserves right change circuitry specifications without notice. does authorize warrant product life support devices critical medical instruments.
2727 grated Circuit Systems
Race Stree Jose, 97-12
Revision 040704

COST VCXO MK2727 ICS's lowest cost, low-jitter, high-performance

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