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MK2745-21
DVD/MPEG CLOCK SOURCE
Description
The MK2745-21 is a low-cost, low-jitter, high-performance clock synthesizer for DVD and other MPEG 2-based applications. Using analog Phase-Locked Loop (PLL) techniques, the device accepts a 27 MHz fundamental mode crystal or clock input to produce multiple audio output clocks, a processor clock, the processor clock divided by two, 27 MHz, 24.576 MHz, and a selectable audio clock. The audio clocks are frequency-locked to the 27 MHz using our patented zero ppm error techniques. This allows audio and video to track exactly, thereby eliminating the need for large buffer memory. ICS manufactures a large variety of DVD, Set-top Box, and multimedia clock synthesizers for all applications. Consult ICS to eliminate crystals and oscillators from your board.
Features
* * * *
Packaged in a 16-pin narrow (150 mil) SOIC Ideal for LuxSonor's DVD solutions 3.3 V upgrade to the MK2744 Patented zero ppm audio clock error for 256x and 384x sampling rates 44.1, and 48 kHz in most DACs
* Selectable audio sampling frequencies support 32, * * * * * * * *
VDD 2
27 MHz fundamental crystal or clock input Eight selectable processor frequencies Fixed clocks of 27 and 24.576 MHz Zero ppm in all clocks 25 mA output drive capability at TTL levels Advanced, low-power, sub-micron CMOS process Operating voltage of 3.0 V to 5.5 V See also the MK2712 for NTSC/PAL clocks
Block Diagram
AS2:0
3
Audio Clock Clock Synthesis and Control Circuitry
/2
24.576 MHz Processor Clock PCLK/2
PS1:0 27 MHz crystal or clock X1
2
Clock Buffer/ Crystal Ocsillator X2 2 GND
27 MHz
MDS 2745-21 D I n t e gra te d C i r c u i t S y s t e m s
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525 Race Stre et, San Jo se, CA 9 5126
Revision 042904 te l (40 8) 2 97-12 01
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MK2745-21 DVD/MPEG CLOCK SOURCE
Pin Assignment
PS1 X2 X1/ICLK VDD GND ACLK PCLK AS2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PS0 24.576M PCLK/2 VDD AS1 GND 27M AS0
Audio Clock (MHz) DecodingTable
AS2 AS1 AS0
0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1
ACLK
12.288 11.2896 8.192 24.576 8.192 16.9344 18.432 11.2896
16-pin (150 mil) SOIC
Processor Clock (MHz)
PS1 PS0
0 0 1 1 0 1 0 1
PCLK
66.66 80 50 60
PCLK/2
33.33 40 25 30
0 = connect directly to ground 1 = connect directly to VDD
Pin Descriptions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 Pin Name PS1 X2 X1/ICLK VDD GND ACLK PCLK AS2 AS0 27M GND AS1 VDD Pin Type Input XO XI Power Power Output Output Input Input Output Power Input Power Pin Description Processor clock Select 1. Selects processor clock outputs per table above. Crystal connection. Connect to 27 MHz crystal. Leave unconnected for clock input. Crystal connection. Connect to 27 MHz crystal or to a 27 MHz input clock. Connect to +3.3 V or +5 V. Must be same as other VDD. Connect to ground. Audio Clock output. Determined by status of AS2, AS1, AS0. See table above. Processor Clock output. Determined by status of PS1, PS0. See table above. Audio clock Select 2. Selects audio clock on pin 6 per table above. Audio clock Select 0. Selects audio clock on pin 6 per table above. 27 MHz clock output. Connect to ground. Audio clock Select 1. Selects audio clock on pin 6 per table above. Connect to +3.3 V or +5 V. Must be same as other VDD.
MDS 2745-21 D In te grated Circuit Systems
2
525 Ra ce Street, San Jose, CA 9512 6
Revision 042904 tel (4 08) 297-1 201
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MK2745-21 DVD/MPEG CLOCK SOURCE
Pin Number 14 15 16
Pin Name PCLK/2 24.576M PS0
Pin Type Output Output Input
Pin Description Processor Clock divided by two output. Determined by status of PS1, PS0. See table above. 24.576 MHz clock output. Processor clock Select 0. Selects processor clock outputs per table above.
External Components
The MK2745-21 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1F should be connected between VDD and GND, as close to the MK2745-21 as possible. A series termination resistor of 33 may be used for each clock output. If a clock input is not used, the 27 MHz crystal must be connected as close to the chip as possible. The crystal should be a fundamental mode (do not use third overtone), parallel resonant, 50 ppm or better. Crystal capacitors should be connected from pins X1 to ground and X2 to ground. The value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps (pF) = (CL-6) x 2. So, for a crystal with 16 pF load capacitance, two 20 pF caps should be used.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2745-21. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70C -65 to +150C 125C 260C
MDS 2745-21 D In te grated Circuit Systems
3
525 Ra ce Street, San Jose, CA 9512 6
Revision 042904 tel (4 08) 297-1 201
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MK2745-21 DVD/MPEG CLOCK SOURCE
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
0 +3.0
Typ.
Max.
+70 +5.5
Units
C V
DC Electrical Characteristics
VDD = 5.0 V (unless noted), Temp 0 to +70C
Parameter
Operating Voltage Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Output High Voltage Operating Supply Current Short Circuit Current Input Capacitance
Symbol
VDD VIH VIL VIH VIL VOH VOL VOH IDD IOS CIN
Conditions
X1/ICLK pin only X1/ICLK pin only
Min.
3.0 (VDD/2)+1
Typ.
Max.
5.5 (VDD/2)-1
Units
V V V V V V V V mA mA pF
2 0.8 IOH = -25 mA IOL = 25 mA IOH = -8 mA No Load, Note 1 Each output VDD-0.4 37 100 7 2.4 0.4
Note 1: With processor clock at 50 MHz and ACLK at 16.93 MHz.
AC Electrical Characteristics
VDD = 5.0 V (unless noted), Temp 0 to +70C
Parameter
Input Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Frequency Error Absolute Jitter, short term
Symbol
tOR tOF
Conditions
0.8 to 2.0 V 2.0 to 0.8 V at VDD/2 Variation from mean
Min.
Typ.
27
Max. Units
MHz 1.5 1.5 ns ns % ppm ps
40 0 200
60 1
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
120 115 105 58
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 2745-21 D In te grated Circuit Systems
4
525 Ra ce Street, San Jose, CA 9512 6
Revision 042904 tel (4 08) 297-1 201
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MK2745-21 DVD/MPEG CLOCK SOURCE
Package Outline and Package Dimensions (16-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters Symbol Min Max Inches Min Max
16
E INDEX AREA
H
12 D
A A1 B C D E e H h L
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0 8
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .3859 .3937 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8
A A1
h x 45 C
-Ce
B SEATING PLANE L
.10 (.004)
C
Ordering Information
Part / Order Number
MK2745-21S MK2745-21STR MK2745-21SLF MK2745-21SLFTR
Marking
2745-21S 2745-21S 2745-21SLF 2745-21SLF
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel
Package
16-pin SOIC 16-pin SOIC 16-pin SOIC 16-pin SOIC
Temperature
0 to 70 C 0 to 70 C 0 to 70 C 0 to 70 C
"LF" denotes Pb (lead) free package
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 2745-21 D In te grated Circuit Systems
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525 Ra ce Street, San Jose, CA 9512 6
Revision 042904 tel (4 08) 297-1 201
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