MK3732-08 ADSL Clock Source Description Features The MK3732-08 is a low cost, low jitter, high performance VCXO and PLL clock synthesizer designed to replace expensive discrete VCXOs and multipliers. The on-chip Voltage Controlled Crystal Oscillator (VCXO) accepts a 0 to 3.3 V input voltage to cause the output clocks to vary by ±100 ppm. Using ICS/MicroClock’s patented VCXO and analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 17.664 MHz or 24.576 MHz pullable crystal input to produce one or two output clocks. • Packaged in 20 pin SSOP (QSOP) • Replaces a VCXO and oscillator • Uses an inexpensive pullable crystal • On-chip patented VCXO with pull range of 230 ppm (±115 ppm) minimum • VCXO tuning voltage of 0 to 3.3 V • Advanced, low power, sub-micron CMOS process • 3.3V operating voltage • Available in industrial temperature range ICS manufactures the largest variety of xDSL clock synthesizers for all applications. Consult ICS to eliminate VCXOs, crystals and oscillators from your board. Block Diagram VDD 3 S2:S0 REFEN PD PLL/Clock Synthesis Circuitry VIN 17.664 MHz or 24.576 MHz pullable crystal GND X1 Voltage Controlled Crystal Oscillator Output Buffer CLK1 Output Buffer CLK2 Output Buffer REF X2 OE MDS 3732-08 C 1 Revision 091201 Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • (408) 295-9818 fax • www.icst.com MK3732-08 ADSL Clock Source Pin Assignment Clock Select Table X1 1 20 X2 NC 2 19 NC VDD 3 18 S1 VDD 4 17 REF VDD 5 16 REFEN VIN 6 15 S0 GND 7 14 OE GND 8 13 GND 9 12 S2 CLK2 10 11 CLK1 PD 20 pin (150 mil) SSOP Pin Descriptions S2 0 0 0 0 0 0 1 1 1 1 1 1 S1 0 0 0 1 1 1 0 0 0 1 1 1 S0 0 M 1 0 M 1 0 M 1 0 M 1 Input 24.576 * 17.664 17.664 17.664 17.664 17.664 17.664 17.664 17.664 17.664 17.664 17.664 CLK1 2.208 20.00 20.19 70.66 70.66 58.88 35.328 2.208 20.19 4.04 35.328 35.328 CLK2 OFF OFF 35.328 35.328 35.328 35.328 52.992 35.328 OFF 35.328 61.82 56.52 0=connect directly to GND; M=leave unconnected (floating); 1=connect directly to VDD * In this mode, 12.288 MHz is present on REF Number Name Type Description 1 X1 XI Crystal connection. Connect to a pullable crystal of 17.664 MHz or 24.576 MHz.. 2, 19 NC - No Connect. Do not connect anything to this pin. 3, 4, 5 VDD P Power Supply. Connect to +3.3V. 6 VIN VI Voltage Input to VCXO. Zero to 3.3V signal which controls the VCXO frequency. 7, 8, 9 GND P Connect to ground. 10 PD 11 CLK1 I(PU) Power Down active low. Turns entire chip off, clocks stop low. 12 CLK2 13 S2 I(PU) Select input #2. Selects outputs per table above. 14 OE I(PU) Output Enable. Tri-states outputs when low. 15 S0 16 REFEN 17 REF 18 S1 20 X2 O Clock Output #1 per table above. O Clock Output #2 per table above. TI Select input #0. Selects outputs per table above. I(PU) Reference Clock Enable. Enables REF Output when low. Connect to VDD for lowest jitter. O Reference Clock Output. This is the crystal oscillator output clock. I(PU) Select input #1. Selects outputs per table above. XO Crystal connection. Connect to a pullable crystal of 17.664 MHz or 24.576 MHz. Key: I(PU) = Input with internal pull-up resistor; TI = Tri-level Input; O = Output; P = Power Supply Connection; VI = Analog Voltage Input; XI, XO = Crystal Pins. External Components The MK3732-08 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.01µF should be connected between VDD and GND pins 3 and 7, pins 4 and 8, and pins 5 and 9, as close to the MK3732-08 as possible. A series termination resistor of 33 Ω may be used for each clock output. The input crystal must be connected as close to the chip as possible. The input crystal should be a fundamental mode, parallel resonant, pullable, AT cut. Consult ICS for recommended suppliers. IMPORTANT - Consult the Application Note MAN05 for layout guidelines. MDS 3732-08 C 2 Revision 091201 Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • (408) 295-9818 fax • www.icst.com MK3732-08 ADSL Clock Source Electrical Specifications Parameter Conditions Minimum Typical Maximum Units ABSOLUTE MAXIMUM RATINGS (note 1) Supply voltage, VDD Referenced to GND 7 V Inputs and Clock Outputs Referenced to GND -0.5 VDD+0.5 V Ambient Operating Temperature Commercial version 0 70 °C Industrial version -40 85 °C Soldering Temperature Max of 10 seconds 260 °C Storage temperature -65 150 °C DC CHARACTERISTICS (VDD = 3.3V unless noted) Core Operating Voltage, VDD 3.14 3.3 3.46 V Input High Voltage, VIH, binary inputs 2 V Input Low Voltage, VIL, binary inputs 0.8 V Input High Voltage, VIH, trinary input S0, pin 15 VDD-0.5 V Input Low Voltage, VIL, trinary input S0, pin 15 0.5 V Output High Voltage, VOH IOH=-12mA 2.4 V Output Low Voltage, VOL IOL=12mA 0.4 V Output High Voltage, VOH, CMOS level IOH=-4mA VDD -0.4 V Operating Supply Current, IDD No Load 19 mA Short Circuit Current Each output ±50 mA Input Capacitance S2:S0, OE 5 pF Frequency synthesis error Both clocks 0 ppm VIN, VCXO control voltage 0 3.3 V AC CHARACTERISTICS (VDD = 3.3V unless noted) Input Crystal Frequency 17.664 24.576 MHz Output Clock Frequency 2.208 70.656 MHz 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 VDD/2 40 60 % Maximum Absolute Short Term Jitter 15 pF load at output ±125 ps Phase Noise, relative to carrier 10 kHz offset, no REF -115 dBc/Hz Output pullability, note 2 0V < VIN < 3.3V ±115 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 an ICS approved pullable crystal. Pullable Crystal Specifications: Correlation (load) Capacitance C0/C1 ESR Operating Temperature Initial Accuracy Temperature plus Aging Stability 14 pF 250 max 35 Ω max 0 to 70 °C or -40 to 85 °C ±20 ppm ±50 ppm MDS 3732-08 C 3 Revision 091201 Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • (408) 295-9818 fax • www.icst.com MK3732-08 ADSL Clock Source Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) 20 pin SSOP E1 INDEX AREA 1 Symbol A A1 b c D e E E1 L E 2 D A1 Millimeters Min Max 1.35 1.75 0.10 0.25 0.20 0.30 0.19 0.25 8.56 8.74 0.635 BSC 5.79 6.20 3.81 3.99 0.41 1.27 A c e Inches Min Max 0.053 0.069 0.004 0.010 0.008 0.012 0.007 0.010 0.337 0.344 .025 BSC 0.228 0.244 0.150 0.157 0.016 0.050 b L Ordering Information Part/Order Number Marking Shipping packaging Package Temperature MK3732-08R MK3732-08R tubes 20 pin SSOP 0 to 70 °C MK3732-08RTR MK3732-08R tape and reel 20 pin SSOP 0 to 70 °C MK3732-08RI MK3732-08RI tubes 20 pin SSOP -40 to 85 °C MK3732-08RITR MK3732-08RI tape and reel 20 pin SSOP -40 to 85 °C While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (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. MDS 3732-08 C 4 Revision 091201 Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • (408) 295-9818 fax • www.icst.com