Audio Clock Source MK2705 provides synchronous clock generation a
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MK2705
Audio Clock Source
MK2705 provides synchronous clock generation audio sampling clock rates derived from MPEG stream, used standalone clock source with crystal. device uses latest technology provide good phase noise long term jitter characteristics small package. Please contact have requirement input output frequency included here rapidly modify this product meet special requirements.
Features
Packaged (150 wide) SOIC Clock crystal input phase noise jitter Exact ppm) multiplication ratios Independent output voltage Support times sampling rate
Block Diagram
VDDO
X1/REFIN crystal clock input
Crystal Oscillator
Clock Synthesis Control Circuitry
Optional crystal load capacitors
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
MK2705 Audio Clock Source
Assignment
X1/REFIN VDDO
Output Clock Selection Table
Input Frequency (MHz)
Output Frequency (MHz)
8.192 11.2896 12.288 24.576
SOIC
Descriptions
Number
Name
X1/REFIN VDDO
Type
Input Power Input Power Output Input Power Input
Connect this crystal clock input Power supply crystal oscillator PLL. Output frequency selection. Determines output frequency table above. chip pull Connect ground. Clock output. Output frequency selection. Determines output frequency table above. chip pull Power supply output stage. Connect this crystal. Leave open using clock input.
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
MK2705 Audio Clock Source
Application Information
Series Termination Resistor
Clock output traces should series termination. series terminate trace commonly used trace impedance), place resistor series with clock line, close clock output possible. nominal impedance clock output 20W. possible noise pickup, very short traces (and vias) been crystal device. value load capacitors roughly determined formula 2(CL where load capacitor connected specified value load capacitance crystal. typical crystal 18pF, 2(18 24pF. Because these capacitors adjust stray capacitance PCB, check output frequency using your final layout value should changed.
Decoupling Capacitors
with high performance mixed-signal MK2705 must isolated from system power supply noise perform optimally. Decoupling capacitors 0.01µF must connected between each ground plane. further guard against interfering system supply noise, MK2705 should common connection power plane shown diagram next page. ferrite bead bulk capacitor help reduce lower frequency noise supply that lead output clock phase modulation.
Layout Recommendations
optimum device performance lowest output phase noise, following guidelines should observed. Each 0.01µF decoupling capacitor should mounted component side board close possible. vias should used between decoupling capacitor pin. trace should kept short possible, should trace ground via. Distance ferrite bead bulk decoupling from device less critical. external crystal should mounted next device with short traces. traces should routed next each other with minimum spaces, instead they should separated away from other traces. minimize obtain best signal integrity, series termination resistor should placed close clock output. optimum layout with components same side board, minimizing vias through other signal layers (the ferrite bead bulk decoupling capacitor mounted back). Other signal traces should routed away from MK2705. This includes signal traces just underneath device, layers adjacent ground plane layer used device.
Recommended Power Supply Connection Optimal Device Performance
Connection 3.3V Power Plane Ferrite Bead
Bulk Decoupling Capacitor (such Tantalum) 0.01 Decoupling Capacitors Both pins must connected same voltage.
Crystal Load Capacitors
crystal used, device crystal connections should include pads capacitors from ground from ground. These capacitors used adjust stray capacitance board match nominally required crystal load capacitance. reduce
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
MK2705 Audio Clock Source
Absolute Maximum Ratings
Stresses above ratings listed below cause permanent damage MK2705. 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 Junction Temperature Soldering Temperature 4.5V
Rating
-0.5V VDD+0.5V +70°C +150°C 175°C 260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured respect GND)
Min.
+3.0
Typ.
Max.
+3.6
Units
Electrical Characteristics
Unless stated otherwise, 3.3V ±10%, Ambient Temperature +70°C
Parameter
Operating Voltage Input High Voltage Input Voltage Output High Voltage Output High Voltage Output Voltage Supply Current Standby Supply Current Short Circuit Current Nominal Output Impedance Input Capacitance Actual mean frequency error versus target Internal pull-up resistor value
Symbol
IDDPD ZOUT
Conditions
Min.
Typ.
Max.
Units
25mA Load
VDD-0.4
Each output input pins Note
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
MK2705 Audio Clock Source
Electrical Characteristics
Unless stated otherwise, 3.3V ±10%, Ambient Temperature +70°
Parameter
Crystal Frequency Output Duty Cycle Output Clock Rise Time Output Clock Fall Time Jitter, short term Jitter, long term Single sideband phase noise
Symbol
Conditions
Measured VDD/2
Min.
Typ.
Max.
Units
delay offset -110
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
MK2705 Audio Clock Source
Package Outline Package Dimensions SOIC, Body)
Package dimensions kept current with JEDEC Publication
Millimeters
Inches
Symbol
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
MK2705S MK2705STR
Marking
MK2705S MK2705S
Shipping packaging
Tubes Tape Reel
Package
SOIC SOIC
Temperature
+70° +70°
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.
2705
Revision 070103
Integrated Circuit Systems, Inc. Race Street, Jose, 95126 (408) 295-9800 www.icst.com
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