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| VT83027 27MHz, 3.3V VCXO (Voltage-Controlled Crystal Oscillator) Applications *= *= Set-top boxes Telecom switching *= *= HDTV MPEG Video clock source General Description The Vaishali VT83027 is a single-chip, integrated VCXO and Phase Locked Loop (PLL) clock synthesizer. The device uses the VCXO and an analog Phase-Locked Loop (PLL) to accept a 13.5 MHz, 14 pF (pull range of 200 ppm) crystal input, and produce a 27 MHz output. A 0 to 3V control signal is used to fine tune the output clock frequency in the 100ppm range. Features *= *= *= 3.3V supply operation Low jitter PLL Clock Synthesizer -= Zero ppm synthesis error Uses inexpensive pullable crystal *= *= *= 12mA drive capability On-chip oscillator with 200 ppm pull range (100 ppm) 8 pin SOIC package Figure 1. Functional Block Diagram Figure 2. Pin Configuration VDD1 VDD2 VT83027 VIN X2 13.5 MHz Pullable Crystal Load Cap Control Low Phase osc Noise PLL X1 VDD1 Output Buffer CLK1 1 2 3 4 8 7 6 5 X2 GND1 VDD2 CLK Load Caps VIN GND2 8 pin (150 mil) SOIC X1 GND1 GND2 2001-04-17 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDST-0003-03 Ph. 408.377.6060 Fax 408.377.6063 VT83027 Table 1. Pin Description Name X1 VDD1 VIN GND2 CLK VDD2 GND1 X2 1 2 3 4 5 6 7 8 Pin # Type Xi P I P O P P Xi Core VDD. Connect to 3.3V Description Crystal connection. Connect to a 13.5 MHz pullable crystal Voltage input to VCXO. Zero to 3V signal controls the frequency of the VCXO. Connect to ground. Clock output Output driver VDD . Connect to 3.3V Connect to ground. Crystal connection. Connect to a13.5 MHz pullable crystal. Legend: I = Input O = Output P = Power supply connection Xi = Crystal connections. Table 2. Pullable Crystal Specifications Parameter Correlation (load) capacitance C0/C1 ESR Operating Temperature Initial Accuracy Temperature + Aging Stability Value 14 pF 240 max 35 max 0C to +70C 20 ppm 50 ppm Table 3. Absolute Maximum Ratings Parameter Supply voltage, VDD Inputs and Clock Outputs Soldering Temperature Storage temperature Conditions Referenced to GND Referenced to GND Max of 10 seconds Min -0.5 Typ Max 5 VDD+0.5 260 Units V V C C -65 150 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and correct functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. 2001-04-17 Vaishali Semiconductor Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDST-0003-03 Ph. 408.377.6060 Fax 408.377.6063 VT83027 Table 4. Operating Conditions Parameter Operating Voltage, VDD Input High Voltage, VIH Input Low Voltage, VIL Operating Temperature VCXO control voltage, VIN X1 pin only X1 pin only 0 0 Conditions Min 3.15 2.5 Typ 3.3 Max 3.45 Units V V 0.4 70 3 V C V Table 5. DC Electrical Characteristics TA = 0C to +70C, VDD = 3.15 V to 3.45 V Symbol VOH VOL IIL IIH IOS CIN IDDQ IDD Parameter Output High Voltage Output Low Voltage Input Low Leakage Current Input High Leakage Current Short Circuit Current Input Capacitance Quiescent Power Supply Current Operating Supply Current Condition IOH=-12mA IOL=12mA VIN = 0v VIN = 3.45v Each output X1 and VIN inputs Min 2.4 Typ (1) Max 0.4 -60 60 Units V V A A mA pF 85 7 No load No Load 28 18 mA mA Note: 1. Typical values are at VDD = 3.3V and 25C Table 6. AC Electrical Characteristics TA = 0C to +70C, VDD = 3.15 V to 3.45 V Symbol fosc tr tf tod tjit (pk- pk) Parameter Input Crystal Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter (Peak to Peak) Output pullability Condition 0.8 to 2.0V 2.0 to 0.8V At VDD/2 Min Typ 13.500 Max 1.5 1.5 Units MHz ns ns % ps 40 100 60 0V VIN 3V 100 ppm Note: 1. Typical values are at VDD = 3.3V and 25C Ordering Information Part Number VT83027S1 VT83027S1X VT83027/D VT83027/DW Marking VT83027S1 VT83027S1 Shipping/Packaging Tubes Tape & Reel Dice in waffle-pack Dice in wafer form No. of Pins 8 8 Package SOIC SOIC Temperature 0C to +70C 0C to +70C 0C to +70C 0C to +70C 2001-04-17 Vaishali Semiconductor Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDST-0003-03 Ph. 408.377.6060 Fax 408.377.6063 |
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