MK3720DLF

DATASHEET 27 MHZ AND 54 MHZ 3.3 VOLT VCXO MK3720 CONFIDENTIAL Description Features The MK3720D is a drop-in replacement for the MK3720S and MK3720A devices. Compared to these earlier devices the MK3720D offers a wider operating frequency range and improved power supply noise rejection. • MK3720D is a drop-in upgrade to the earlier MK3720S and MK3720A devices • • • • • • The MK3720 is a low-cost, low-jitter, high-performance 3.3 Volt VCXO designed to replace expensive 13.5, 27, or 54 MHz 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 ICS’ patented VCXO and analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external pullable crystal input to produce output clocks of 13.5 MHz, 27 MHz, and 54 MHz. Packaged in 8-pin SOIC Available in Pb (lead) free package Operating voltage of 3.3 V (±5%) Output clocks of 54, 27, and 13.5 MHz Uses an inexpensive 13.500 MHz external crystal On-chip VCXO (patented) with pull range of 200 ppm (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 MK3720D exhibits a moderate VCXO gain of 120 ppm/V typical, when used with a high-quality external pullable quartz crystal. MK3720D 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. Block Diagram VDD V IN 54 M H z 1 3 .5 M H z P u lla b le C ry s ta l P L L /C lo c k S y n th e s is C irc u itry X1 X2 V o lta g e C o n tro lle d C ry sta l O s cilla to r 27 M Hz 1 3 .5 M H z GND IDT™ / ICS™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO 1 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) MK3720 27 MHZ AND 54 MHZ 3.3 VOLT VCXO VCXO Pin Assignment X1 1 8 X2 V DD 2 7 27M VI N 3 6 13.5M GND 4 5 54M 8 - Pi n ( 1 5 0 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 (0.01uf decoupling capacitor recommended). 3 VIN Input Voltage input to VCXO. Zero to 3.3 V analog input which controls the oscillation frequency of the VCXO. 4 GND Power Connect to ground. 5 54M Output 54 MHz VCXO clock output. 6 13.5 Output 13.5 MHz VCXO clock output. 7 27 8 X2 Output 27 MHz VCXO clock output. Input IDT™ / ICS™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO Crystal connection. Connect to the external pullable crystal. 2 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) MK3720 27 MHZ AND 54 MHZ 3.3 VOLT VCXO VCXO External Component Selection Crystal Tuning Load Capacitors 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. The MK3720 requires a minimum number of external components for proper operation. Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD (pin 2) and GND (pin 4), as close to these pins 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 procedure for determining the value of these capacitors can be found in application note MAN05. Series Termination Resistor When the PCB trace between the clock output (CLK, pin 5) 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. Quartz Crystal The MK3720 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 frequency of oscillation of a quartz crystal is determined by its “cut” and by the load capacitors connected to it. The MK3720 incorporates on-chip variable load capacitors that “pull” (change) the frequency of the crystal. The crystal specified for use with the MK3720 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF. Recommended Crystal Parameters: See application note MAN05 for crystal information. MAN05 is available on the internet at www.icst.com/pdf/man05.pdf. The external crystal must be connected as close to the chip as possible and should be on the same side of the PCB as the MK3720. 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. IDT™ / ICS™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO 3 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) MK3720 27 MHZ AND 54 MHZ 3.3 VOLT VCXO VCXO Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK3720. 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 Min. Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Max. Units 0 +70 °C +3.15 +3.45 V Reference crystal parameters Typ. Refer to page 3 Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ / ICS™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO Symbol Conditions Min. Typ. Max. Units θJA Still air 150 °C/W θJA 1 m/s air flow 140 °C/W θJA 3 m/s air flow 120 °C/W 40 °C/W θJC 4 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) MK3720 27 MHZ AND 54 MHZ 3.3 VOLT VCXO VCXO DC Electrical Characteristics VDD=3.3 V ±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 13 mA ±50 mA 0 3.3 V AC Electrical Characteristics VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Crystal Pullability FP VCXO Gain Conditions 0V< VIN < 3.3V, Note 1 Min. Typ. Max. Units + 115 VIN = VDD/2 +1 V, Note 1 ppm 120 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 1.4 V, CL=15 pF 55 % Maximum Output Jitter, short term tJ CL=15 pF, 13.5M CLK 80 ps CL=15 pF, 27M and 54M CLK 150 ps 45 50 Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Note 2: Original MK3720S and MK3720A provided +100 ppm crystal pullability. Note 3: Original MK3720S and MK3720A provided 100 and 170 ppm/V respectively. IDT™ / ICS™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO 5 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) MK3720 27 MHZ AND 54 MHZ 3.3 VOLT VCXO VCXO Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body) 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 MK3720D MK3720DTR MK3720DLF MK3720DLFTR MK3720D MK3720D MK3720DL MK3720DL Tubes Tape and Reel Tubes Tape and Reel 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 Note 1: MK3720D is recommended for new designs. Call factory for information on MK3720A and MK3720S. Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. 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™ 27 MHZ AND 54 MHZ 3.3 VOLT VCXO 6 MK3720 REV I 061705 CONFIDENTIAL (DELETE IF NOT NEEDED) IMPORTANT NOTICE AND DISCLAIMER RENESAS ELECTRONICS CORPORATION AND ITS SUBSIDIARIES (“RENESAS”) PROVIDES TECHNICAL SPECIFICATIONS AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. These resources are intended for developers skilled in the art designing with Renesas products. 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