MK3721DLF

DATASHEET MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO Description Features The MK3721 series of devices includes the original MK3721S and the new MK3721D. The MK3721D is a drop-in replacement for the MK3721S device. Compared to the earlier device, the MK3721D offers a wider operating frequency range and improved power supply noise rejection. • MK3721D is a drop-in replacement for the earlier MK3721S device The MK3721 is a low cost, low-jitter, high-performance 3.3 volt VCXO designed to replace expensive discrete VCXOs modules. The 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 ICS’ patented VCXO techniques, the device uses an inexpensive external pullable crystal in the range of 16.2 to 28 MHz to produce a VCXO output clock at that same frequency. ICS manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. If more clock outputs are needed, see the MK3732 or MK377x family of parts. Consult ICS to eliminate VCXOs, crystals, and oscillators from your board. • • • • Packaged in 8-pin SOIC • • • • • VCXO tuning voltage of 0 to 3.3 V Operational frequency range of 16.2 MHz to 28 MHz Uses an inexpensive external crystal On-chip patented VCXO with pull range of 200 ppm (minimum) Operating voltage of 3.3 V 12 mA output drive capability at TTL levels Advanced, low-power, sub-micron CMOS process For frequencies between 1 MHz and 8 MHz, use the MK3713D. For higher than 28 MHz, use the MK3732-05. • Available in a lead-free package MK3721D is recommended for new designs. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Because VIN is a high-impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3.3 V. Block Diagram VDD VIN X1 16.2 to 28 MHz Pullable Crystal X2 Voltage Controlled Crystal Oscillator 16.2 to 28 MHz Clock (REFOUT) GND IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO 1 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO Pin Assignment X1 1 8 X2 VDD 2 7 DC VIN 3 6 REFOUT GND 4 5 DC MK3721S MK3721D 8-Pi n ( 150 mi l ) SOI C Pin Descriptions Pin Number Pin Name Pin Type Pin Description 1 XI Input Crystal connection. Connect to the external pullable crystal. 2 VDD Power Connect to +3.3 V (0.01µf decoupling capacitor recommended). 3 VIN Input Voltage input to VCXO. Zero to 3.3 V signal which controls the VCXO frequency. 4 GND Power Connect to ground. 5 DC -- 6 REFOUT Output 7 DC -- 8 X2 Input Do not connect to this pin. VCXO CMOS level clock output matches the nominal frequency of the crystal. Do not connect anything to this pin. Crystal connection. Connect to a pullable 16.2 to 28 MHz crystal. IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO 2 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO External Component Selection as possible and should be on the same side of the PCB as the MK3721. There should be no via’s between the crystal pins and the X1 and X2 device pins. There should be no signal traces underneath or close to the crystal. See application note MAN05. The MK3721 requires a minimum number of external components for proper operation. Decoupling Capacitors Crystal Tuning Load Capacitors A decoupling capacitor of 0.01µF should be connected between VDD and GND on pins 2 and 4 as close to the MK3721 as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. The crystal traces should include pads for small fixed capacitors, one between X1 and ground, and another between X2 and ground. Stuffing of these capacitors on the PCB is optional. The need for these capacitors is determined at system prototype evaluation, and is influenced by the particular crystal used (manufacture and frequency) and by PCB layout. The typical required capacitor value is 1 to 4 pF. Series Termination Resistor When the PCB trace between the clock output and the load is over 1 inch, series termination should be used. To series terminate a 50Ω trace (a commonly used trace impedance), place a 33Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. The procedure for determining the value of these capacitors can be found in application note MAN05. Quartz Crystal The MK3721 VCXO function consists of the external crystal and the integrated VCXO oscillator circuit. To assure the best system performance (frequency pull range) and reliability, a crystal device with the recommended parameters (shown below) must be used, and the layout guidelines discussed in the following section shown must be followed. The oscillation frequency of a quartz crystal is determined by its “cut” and by the load capacitors connected to it. The MK3721 incorporates on-chip variable load capacitors that “pull” (change) the frequency of the crystal. The crystal specified for use with the MK3721 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF. Recommended Crystal Parameters: Initial Accuracy at 25°C Temperature Stability Aging Load Capacitance Shunt Capacitance, C0 C0/C1 Ratio Equivalent Series Resistance ±20 ppm ±30 ppm ±20 ppm 14 pf 7 pF Max 250 Max 35 Ω Max The external crystal must be connected as close to the chip IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO 3 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK3721. 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 Rating Supply Voltage, VDD 7V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70°C Storage Temperature -65 to +150°C Soldering Temperature 260°C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Reference crystal parameters IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO Min. Typ. Max. Units 0 – +70 °C +3.45 V +3.15 Refer to page 3 4 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO DC Electrical Characteristics VDD=3.3V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise Parameter Symbol Conditions Operating Voltage VDD Output High Voltage VOH IOH = -12 mA Output Low Voltage VOL IOL = 12 mA Output High Voltage (CMOS Level) VOH IOH = -4 mA Operating Supply Current IDD No load Short Circuit Current IOS VIN, VCXO Control Voltage VIA Min. Typ. 3.15 Max. Units 3.45 V 2.4 V 0.4 V VDD-0.4 V 6 mA ±50 mA 0 3.3 V AC Electrical Characteristics VDD = 3.3V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Typ. Max. Units Output Frequency MK3721D FO MK3721S FO 24 MHz MK3721D FP 0V< VIN < 3.3 V, Note 1 + 115 ppm MK3721S FP 0V< VIN < 3.3 V, Note 1 + 100 ppm 16.2 28 MHz 24 MHz Crystal Pullability VCXO Gain MK3721D VIN = VDD/2 + 1 V, Note 1 120 ppm/V MK3721S VIN = VDD/2 + 1 V, Note 1 140 ppm/V Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 1.5 ns Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 1.5 ns Output Clock Duty Cycle tD Measured at 1.4V, CL=15 pF 60 % Maximum Output Jitter, short term tJ CL=15 pF 40 50 110 ps Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO 5 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO Package Outline and Package Dimensions (8-pin SOIC) Package dimensions are kept current with JEDEC Publication No. 95 Symbol Millimeters Min Max Inches Min Max A A1 B C D E e H h L a 1.35 1.75 1.10 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 0° 8° 0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 .1890 .1968 0.1497 0.1574 0.050 Basic 0.2284 0.2440 0.010 0.020 0.016 0.050 0° 8° Index Area E H Pin 1 h x 45 0 D A Q c e b Ordering Information Part / Order Number (Note 1) Marking Shipping packaging Package Temperature MK3721D MK3721DTR MK3721DLF MK3721DLFTR MK3721S MK3721STR MK3721D MK3721D MK3721DL MK3721DL MK3721S MK3721S Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C Note 1: MK3721D is recommended for new designs. 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. IDT™ / ICS™ LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO 6 MK3721 REV E 103003 MK3721 LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO VCXO Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Asia Pacific and Japan Europe Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) Integrated Device Technology Singapore (1997) Pte. Ltd. Reg. No. 199707558G 435 Orchard Road #20-03 Wisma Atria Singapore 238877 +65 6 887 5505 IDT Europe, Limited Prime House Barnett Wood Lane Leatherhead, Surrey United Kingdom KT22 7DE +44 1372 363 339 © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. 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