VT83027 27MHz, 3.3V VCXO (Voltage-Controlled Crystal Oscillator) Applications •= Set-top boxes •= HDTV •= Telecom switching •= 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 •= ±12mA drive capability •= Low jitter PLL Clock Synthesizer •= On-chip oscillator with 200 ppm pull range (±100 ppm) •= 8 pin SOIC package −= •= Zero ppm synthesis error Uses inexpensive pullable crystal Figure 1. Functional Block Diagram VDD1 Figure 2. Pin Configuration VDD2 VT83027 Load Cap Control VIN X2 13.5 MHz Pullable Crystal Load Caps Low Phase osc Noise PLL Output Buffer CLK1 X1 1 8 X2 VDD1 2 7 GND1 VIN 3 6 VDD2 GND2 4 5 CLK 8 pin (150 mil) SOIC X1 GND1 GND2 Page 1 MDST-0003-03 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 2001-04-17 VT83027 Table 1. Pin Description Name Pin # Type Description X1 1 Xi Crystal connection. Connect to a 13.5 MHz pullable crystal VDD1 2 P Core VDD. Connect to 3.3V VIN 3 I Voltage input to VCXO. Zero to 3V signal controls the frequency of the VCXO. GND2 4 P Connect to ground. CLK 5 O Clock output VDD2 6 P Output driver VDD . Connect to 3.3V GND1 7 P Connect to ground. X2 8 Xi 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 Value Correlation (load) capacitance 14 pF C0/C1 240 max ESR 35 Ω max 0°C to +70°C Operating Temperature Initial Accuracy ±20 ppm Temperature + Aging Stability ±50 ppm Table 3. Absolute Maximum Ratings Parameter Conditions Supply voltage, VDD Referenced to GND Inputs and Clock Outputs Referenced to GND Soldering Temperature Max of 10 seconds Storage temperature Min -0.5 -65 Typ Max Units 5 V VDD+0.5 V 260 °C 150 °C 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. Page 2 MDST-0003-03 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 2001-04-17 VT83027 Table 4. Operating Conditions Parameter Conditions Operating Voltage, VDD Input High Voltage, VIH X1 pin only Input Low Voltage, VIL X1 pin only Min Typ Max Units 3.15 3.3 3.45 V 2.5 V 0.4 V Operating Temperature 0 70 °C VCXO control voltage, VIN 0 3 V Table 5. DC Electrical Characteristics TA = 0°C to +70°C, VDD = 3.15 V to 3.45 V Symbol Parameter Condition VOH Output High Voltage IOH=-12mA VOL Output Low Voltage IOL=12mA IIL Input Low Leakage Current VIN = 0v IIH Input High Leakage Current VIN = 3.45v IOS Short Circuit Current Each output CIN Input Capacitance IDDQ Quiescent Power Supply Current No load IDD Operating Supply Current No Load Min (1) Typ Max Units 2.4 V X1 and VIN inputs 0.4 V -60 µA 60 µA ±85 mA 7 pF 18 mA 28 mA Note: 1. Typical values are at VDD = 3.3V and 25°C Table 6. AC Electrical Characteristics TA = 0°C to +70°C, VDD = 3.15 V to 3.45 V Symbol Parameter Condition Min Typ Max 13.500 Units fosc Input Crystal Frequency tr Output Clock Rise Time 0.8 to 2.0V 1.5 ns tf Output Clock Fall Time 2.0 to 0.8V 1.5 ns tod Output Clock Duty Cycle At VDD/2 60 % tjit (pk- pk) Maximum Absolute Jitter 40 MHz ±100 ps (Peak to Peak) 0V ≤ VIN ≤ 3V Output pullability ±100 ppm Note: 1. Typical values are at VDD = 3.3V and 25°C 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 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C Page 3 MDST-0003-03 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 2001-04-17