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Description
The MK2772-01 is a low cost, low jitter, high performance VCXO and clock synthesizer for settop boxes. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3V input voltage to cause the output clocks to vary by 100 ppm. Using MicroClock's patented VCXO and analog Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 13.5 MHz crystal input to produce multiple output clocks. All clocks are frequency locked to the 27.00MHz output (and to each other) with zero ppm error. The MK2772 includes a glitch-free multiplexer to switch input sources during operation. MicroClock manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. Consult MicroClock to eliminate VCXOs, crystals and oscillators from your board.
MK2772-01 VCXO and Set-Top Clock Source
Features
* Packaged in 20 pin SOIC * Uses an inexpensive 13.5 MHz crystal * On-chip VCXO (patented) with pull range of 200ppm (minimum) * Ability to switch input sources "on-the-fly" * VCXO tuning voltage of 0 to 3V * Zero ppm synthesis error (patented) in all clocks. All exactly track 27MHz VCXO * All clocks are frequency locked. All will vary the same amount (in ppm) as the VCXO * Selectable Audio clock for 256x, 384x, and 512x. * 25mA output drive capability at TTL levels * Advanced, low power, sub-micron CMOS process * 5V operating voltage
Block Diagram
VDD GND 3 3 2 Clock Synthesis Circuitry Output Buffer Output Buffer Output Buffer Output Buffer
Voltage Controlled Crystal Oscillator and x2 PLL
ACS1:0
Audio Clock 16.6667 MHz 11.0592 MHz
INMUXSEL EXTCLKIN VIN 13.5 MHz pullable crystal
X1
3.6864 MHz 3
X2
deglitched mux
Output Buffers
27.000 MHz
1 Revision 012098 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
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Pin Assignment
ACS1 X2 X1 VDD VIN VDD GND 16.67M 3.68M ACLK 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ACS0 EXTCLKIN 27M GND 27M VDD GND 27M 11.06M INMUXSEL
MK2772-01 VCXO and Set-Top Clock Source
Audio Clock Select
ACS1 ACS0 ACLK (MHz) 0 0 8.192 0 M 16.384 0 1 11.2896 M 0 16.9344 M M 22.5792 M 1 18.432 1 0 12.288 1 M 24.576 1 1 5.6448
Input Source Select
INMUXSEL 0 1 27 MHz Input EXTCLKIN Internal VCXO
Pin Descriptions
Number Name 1 ACS1 2 X2 3 X1 4 VDD 5 VIN 6 VDD 7 GND 8 16.67M 9 3.68M 10 ACLK 11 INMUXSEL 12 11.06M 13 27M 14 GND 15 VDD 16 27M 17 GND 18 27M 19 EXTCLKIN 20 ACS0 Type TI X X P VI P P O O O I O O P P O P O I TI Description Audio Clock Select 1. Determines ACLK frequency, as per table above. Crystal connection. Connect to a pullable 13.5 MHz crystal. Crystal connection. Connect to a pullable 13.5 MHz crystal. Connect to +5V, and other VDDs. Voltage Input to VCXO. Zero to 3V signal which controls the frequency of the VCXO. Connect to +5V. Connect to ground. 16.6667 MHz processor clock output. 3.6864 MHz clock output. Audio Clock Output determined by ACS1,0. Per table above. Input Multiplexer Select. Selects either the internal VCXO/PLL output, or the clock on pin 19. 11.0592 MHz clock output. 27.00 MHz clock output. Connect to ground. Connect to +5V. 27.00 MHz clock output. Connect to ground. 27.00 MHz clock output. External Clock Input. Connect an external 27 MHz clock to this pin for glitch free switching. Audio Clock Select 0. Determines ACLK frequency, as per table above.
Key: I = Input, TI = tri-level input, VI = VCXO input, O = output, P = power supply connection, X = crystal connection
2 Revision 012098 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MDS 2772-01 B
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Electrical Specifications
Parameter Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Input High Voltage, VIH, X1 pin only Input Low Voltage, VIL, X1 pin only Input High Voltage, VIH Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Pull-up Resistor value Input Capacitance Frequency synthesis error VIN, VCXO control voltage Conditions
MK2772-01 VCXO and Set-Top Clock Source
Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.25 2.5 2.5 1.5 Units V V C C C V V V V V V V V V mA pF ppm V
ABSOLUTE MAXIMUM RATINGS (note 1)
Referenced to GND Referenced to GND Max of 10 seconds -65 4.75 3.5 ACS1, ACS0 INMUXSEL IOH=-25mA IOL=25mA IOH=-8mA No Load, note 2 pin 11 only All clocks as shown 0 VDD-0.5 2 0.8 2.4 0.4 VDD-0.4 45 250k 7 0 -0.5 0
DC CHARACTERISTICS (VDD = 5.0V unless noted)
1 3
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal Frequency 13.50000 MHz Input Crystal Accuracy 30 ppm Output Clock Rise Time 0.8 to 2.0V 1.5 ns Output Clock Fall Time 2.0 to 0.8V 1.5 ns Output Clock Duty Cycle At 1.4V 40 60 % Maximum Absolute Jitter, short term 300 ps 27 MHz output pullability, note 3 0V VIN 3V 100 ppm Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability. 2. With ACLK at 12.288 MHz. 3. With a recommended crystal.
External Components/Crystal Selection
The MK2772-01 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1F should be connected between VDD (pin 15) and GND (14), and between VDD (4) and GND (7), as close to the MK2772-01 as possible. A series termination resistor of 33 may be used for each clock output. The input crystal must be connected as close to the chip as possible. The 13.5 MHz input crystal should be a parallel mode, pullable, AT cut with 14.0pF load capacitance. See Application Note MAN05 for more details on crystal selection and layout. Recommended crystal is from Ecliptek Corporation, P/N ECX-4665-13.500M. Contact Ecliptek at 714 433 1200tel, 714 433 1234fax.
3 Revision 012098 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MDS 2772-01 B
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Package Outline and Package Dimensions
MK2772-01 VCXO and Set-Top Clock Source
20 pin SOIC
Symbol A b c D E H e h Q Inches Min Max 0.092 0.104 0.014 0.019 0.009 0.012 0.490 0.512 0.290 0.300 0.394 0.419 .050 BSC 0.016 0.003 0.011 Millimeters Min Max 2.3368 2.6416 0.356 0.483 0.229 0.305 12.446 13.005 7.366 7.620 10.008 10.643 1.27 BSC 0.406 0.076 0.279
E
H
D Q e b c
h x 45 A
Ordering Information
Part/Order Number MK2772-01S MK2772-01STR Marking MK2772-01S MK2772-01S Shipping packaging tubes tape and reel Package 20 pin SOIC 20 pin SOIC Temperature 0-70C 0-70C
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated 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 MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
4 Revision 012098 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MDS 2772-01 B

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