MK3722G

DATASHEET MK3722 VCXO PLUS AUDIO CLOCK FOR STB Description Features The MK3722 is a low cost, low jitter, high performance VCXO and PLL clock synthesizer designed to replace expensive discrete VCXOs and multipliers. 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 ±115 ppm. Using IDT’s analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 27 MHz pullable crystal input to produce a reference output and a selectable audio clock. • • • • • • • IDT manufactures the largest variety of VCXO based timing devices for all applications. Consult IDT to eliminate VCXOs, crystals, and oscillators from your board. • VCXO tuning voltage of 0 to 3.3 V • Advanced, low power, sub-micron CMOS process The frequency of the on-chip VCXO is adjusted by an external control voltage connected to VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 Packaged in 16-pin TSSOP Available in Pb (lead) free package Replaces a VCXO and oscillator Operating voltage of 3.3V Provides output of 27 MHz plus audio clock Uses an inexpensive 27 MHz pullable crystal On-chip patented VCXO with pull range of 230 ppm (minimum) Block Diagram VDD 3 PLL/Clock Synthesis Circuitry 3 S2:S0 VIN X1 27 MHz Pullable Crystal X2 Voltage Controlled Crystal Oscillator ACLK 27MHz 3 GND IDT™ VCXO PLUS AUDIO CLOCK FOR STB 1 PDTS MK3722 REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER Pin Assignment Audio Clock Select Table X2 1 16 S1 S2 S1 S0 ACLK (MHz) X1 2 15 NC 0 0 0 8.192 VD D 3 14 VD D 0 0 1 11.2896 VD D 4 13 S0 0 1 0 12.288 VIN 5 12 27M 0 1 1 16.9344 GND 6 11 GND GND 7 10 AC LK 1 0 0 18.432 PD TS 8 9 1 0 1 16.384 1 1 0 22.5792 1 1 1 24.576 S2 16 Pin 4.40m m body, 0.65m m pitch TSSO P Pin Descriptions Pin Number Pin Name Pin Type 1 X2 Output Crystal connection. Connect to a 27MHz fundamental mode pullable crystal. 2 X1 Input Crystal connection. Connect to a 27MHz fundamental mode pullable crystal. 3 VDD Power Connect to +3.3 V. 4 VDD Power Connect to +3.3 V. 5 VIN Input Voltage input to VCXO. Zero to 3.3V signal which controls the VCXO frequency. 6 GND Power Connect to ground. 7 GND Power Connect to ground. 8 PDTS Power Power Down Tri-state. This pin powers down entire chip and tri-states the outputs when low. Internal pull-up. 9 S2 Input Select input S2. Selects ACLK per table above. Internal pull-up. 10 ACLK Output Audio clock output per table above. 11 GND Power Connect to ground. 12 27M Output 27MHz reference clock output. 13 S0 Input Select input S0. Selects ACLK per table above. Internal pull-up. 14 VDD Power Connect to +3.3V. 15 NC -- 16 S1 Input IDT™ VCXO PLUS AUDIO CLOCK FOR STB Pin Description No connect. Do not connect anything to this pin. Select input S1. Selects ACLK per table above. Internal pull-up. 2 MK3722 REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER External Component Selection 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 MK3722 requires a minimum number of external components for proper operation. Decoupling Capacitors Decoupling capacitors of 0.01µF should be connected between VDD and GND on pins 3 and 4, pins 6 and 7, and pins 11 and 14 as close to the MK3722 as possible. For optimum device performance, the decoupling capacitors 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 traces between the clock outputs and the loads are 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 MK3722 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 meeting IDT’ recommended parameters must be used, and the layout guidelines discussed in the following section must be followed. See Application Note MAN05 for a full list of crystal parameters. The frequency of oscillation of a quartz crystal is determined by its “cut” and by the load capacitors connected to it. The MK3722 incorporates on-chip variable load capacitors that “pull” (change) the frequency of the crystal. The crystal specified for use with the MK3722 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14pF. 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 MK3722. 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. Crystal Tuning Load Capacitors The crystal traces should include pads for small fixed IDT™ VCXO PLUS AUDIO CLOCK FOR STB 3 MK3722 REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK3722. These ratings, which are standard values for IDT 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. Max. Units 0 +70 °C +3.15 +3.45 V Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Reference crystal parameters Typ. Refer to page 3 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 Input High Voltage (S1:S0) Min. Typ. 3.15 Max. Units 3.45 V 2.4 V 0.4 V VDD-0.4 V VIH 2.0 V Input High Voltage (S2) VIH 2.5 V Input Low Voltage (S1:S0) VIL 0.8 V Input Low Voltage (S2) VIL 0.5 V Operating Supply Current IDD Short Circuit Current IOS VIN, VCXO Control Voltage VIA On Chip Pull-up Resistor, inputs RPU S0, S1, S2 150 kΩ Input Capacitance CIN S0, S1, S2 5 pF 20 Ω Nominal Output Impedance IDT™ VCXO PLUS AUDIO CLOCK FOR STB No load, 2 outputs 11 mA ±50 mA 0 ZOUT 4 3.3 MK3722 V REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER 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 Min. 0V< VIN < 3.3 V, Note 1 + 100 Typ. Max. Units ppm VIN = VDD/2 + 1 V, Note 1 80 ppm/V Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 0.75 1.5 ns Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 0.75 1.5 ns Output Clock Duty Cycle tD Measured at 1.65 V, CL=15 pF 50 60 % Maximum Output Jitter, short term tJ CL=15 pF 40 +150 ps Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ VCXO PLUS AUDIO CLOCK FOR STB Symbol Conditions Min. Typ. Max. Units θJA Still air 78 ° C/W θJA 1 m/s air flow 70 ° C/W θJA 3 m/s air flow 68 ° C/W 37 ° C/W θJC 5 MK3722 REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER Package Outline and Package Dimensions (16-pin TSSOP, 4.40 mm Body, 0.65 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 16 Symbol E1 A A1 A2 b C D E E1 e L α E INDEX AREA 1 2 D A 2 Min Inches Max -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 4.90 5.1 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0° 8° Min Max -0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.193 0.201 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0° 8° A A 1 c -Ce b SEATING PLANE L .10 (.004) C Ordering Information Part / Order Number Marking Shipping Packaging Package MK3722G* MK3722GTR* MK3722GLF MK3722GLFTR MK3722G MK3722G MK3722GL MK3722GL Tubes Tape and Reel Tubes Tape and Reel 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP Temperature 0 to +70° 0 to +70° 0 to +70° 0 to +70° C C C C *NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 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 Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT™ VCXO PLUS AUDIO CLOCK FOR STB 6 MK3722 REV F 122109 MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER 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 www.idt.com/go/clockhelp Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 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. Printed in USA