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MK3720 27 MHz and 54 MHz 3.3 Volt VCXO
Description
The MK3720 is a low cost, low jitter, high performance 3.3 Volt VCXO and PLL clock synthesizer designed to replace expensive 13.5, 27, or 54MHz VCXOs. The patented on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to cause the output clocks to vary by 100 ppm. Using our patented VCXO and analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce output clocks of 13.5 MHz, 27 MHz, and 54 MHz . The MK3720A is a drop-in replacement to the earlier MK3720S.
Features
* Packaged in 8 pin SOIC * 3.3 V only operating voltage * Output clocks of 54, 27, and 13.5MHz * Uses an inexpensive 13.500 MHz external crystal * On-chip patented VCXO with pull range of 200ppm (minimum) * VCXO tuning voltage of 0 to 3.3 V * 12 mA output drive capability at TTL levels * Advanced, low power, sub-micron CMOS process * The A version is the latest, manufactured in a smaller geometry process. The MK3720A gives a wider pull range than the MK3720S, and so is recommended for all new designs, and cost reductions of existing designs.
Block Diagram
VIN 13.5 MHz pullable crystal
X1
Output Buffer Voltage Controlled Crystal Oscillator PLL/Clock Synthesis Circuitry Output Buffer Output Buffer
54 MHz Clock 27 MHz Clock 13.5 MHz Clock
X2
1 Revision 053100 Printed 11/16/00 Integrated Circuit Systems, Inc. *525 Race Street * San Jose * CA* 95126* (408)295-9800tel * www.icst.com
MDS 3720 D
MK3720 27 MHz and 54 MHz 3.3 Volt VCXO
Pin Assignment MK3720
X1 VDD VIN GND 1 2 3 4 8 7 6 5 X2 27M 13.5M 54M
8 pin (150 mil) SOIC
Pin Descriptions
Number 1 2 3 4 5 6 7 8 Name X1 VDD VIN GND 54M 13.5M 27M X2 Description Crystal connection. Connect to a pullable 13.5 MHz crystal. VDD. Connect to +3.3 V. Voltage input to VCXO. Zero to 3.3 V analog input which controls the frequency of the VCXO. Connect to ground. 54 MHz VCXO clock output. 13.5 MHz VCXO clock output. 27 MHz VCXO clock output. Crystal connection. Connect to a pullable 13.5 MHz crystal.
Pullable Crystal Specifications:
Correlation (load) Capacitance C0/C1 ESR Operating Temperature Initial Accuracy Temperature plus Aging Stability 14 pF 240 max 35 max 0 to 70 C 20 ppm 50 ppm
2 Revision 053100 Printed 11/16/00 Integrated Circuit Systems, Inc. *525 Race Street * San Jose * CA* 95126* (408)295-9800tel * www.icst.com
MDS 3720 D
MK3720 27 MHz and 54 MHz 3.3 Volt VCXO
Electrical Specifications
Parameter Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Short Circuit Current VIN, VCXO control voltage Input Crystal Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term Output pullability, note 2 Notes: Conditions Referenced to GND Referenced to GND Max of 10 seconds -65 3.15 2.4 VDD-0.4 11 50 0 13.50000 0.8 to 2.0V 2.0 to 0.8V At 1.4V 0V VIN 3.3 V 1.5 1.5 55 3.3 Minimum Typical Maximum 7 VDD+0.5 70 260 150 3.45 0.4 Units V V C C C V V V V mA mA V MHz ns ns % ps ppm
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5 0
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
IOH=-12mA IOL=12mA IOH=-4mA No Load
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
45 100
50 100
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 an ICS approved pullable crystal. The MK3720A has a typical pull range of 180 ppm.
External Components
The MK3720 requires a minimum number of external components for proper operation. A decoupling capacitor of 0.01F should be connected between VDD and GND on pins 2 and 4, as close to the MK3720 as possible. A series termination resistor of 33 may be used for the clock output. The input crystal must be connected as close to the chip as possible. The input crystal should be a parallel mode, pullable, AT cut, 13.5 MHz, with 14 pF load capacitance. Consult ICS for recommended suppliers. IMPORTANT - read application note MAN05 before laying out the PCB.
3 Revision 053100 Printed 11/16/00 Integrated Circuit Systems, Inc. *525 Race Street * San Jose * CA* 95126* (408)295-9800tel * www.icst.com
MDS 3720 D
MK3720 27 MHz and 54 MHz 3.3 Volt VCXO
Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) 8 pin SOIC
Symbol A
A1
B E INDEX AREA H
C
1 h x 45 D
D E e H h L
Inches Min Max 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.0075 0.0098 0.1890 0.1968 0.1497 0.1574 .050 BSC 0.2284 0.2440 0.0099 0.0195 0.0160 0.0500
Millimeters Min Max 1.35 1.75 0.10 0.24 0.33 0.51 0.19 0.24 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27
A1 e B
C
A L
Ordering Information
Part/Order Number MK3720A MK3720ATR MK3720S MK3720STR Marking MK3720A MK3720A MK3720S MK3720S Shipping packaging tubes Tape and reel tubes Tape and reel Package 8 pin SOIC 8 pin SOIC 8 pin SOIC 8 pin SOIC Temperature 0-70 C 0-70 C 0-70 C 0-70 C
CHANGE HISTORY Version Date first published D 5/31/00 C 12/29/99 B 5/25/99 A 4/19/99
Status Released Preliminary Preliminary
Comments Added A version Changed to JEDEC dimensions. Changed VDD to 5%. Added Crystal specs. Updated specs for crystal capacitance, IDD, jitter. Original
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (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.
4 Revision 053100 Printed 11/16/00 Integrated Circuit Systems, Inc. *525 Race Street * San Jose * CA* 95126* (408)295-9800tel * www.icst.com
MDS 3720 D

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