DATASHEET PLL AUDIO CLOCK SYNTHESIZER MK2703B Description Features The MK2703B is a low-cost, low-jitter, high performance Packaged in 8-pin SOIC PLL clock synthesizer designed to replace oscillators and Available in RoHS compliant package PLL circuits in set-top box and multimedia systems. Using Uses an inexpensive, fundamental mode crystal or clock ICS patented analog Phase Locked Loop (PLL) techniques, the device uses a 27 MHz crystal or clock input Patented zero ppm synthesis error in all clocks to produce a buffered reference clock and a selectable All frequencies are frequency locked audio clock. Advanced, low power, sub-micron CMOS process ICS manufactures the largest variety of Set-Top Box and Operating voltage of 3.3 V or 5 V multimedia clock synthesizers for all applications. Consult Industrial temperature version available ICS to eliminate VCXOs, crystals and oscillators from your board. Block Diagram VDD PLL Clock 2 S1:0 Synthesis Audio Clock and Control Circuitry X1 Crystal 27 MHz 27M Oscillator crystal or clock input X2 Capacitors are required for crystal tuning GND IDT / ICS PLL AUDIO CLOCK SYNTHESIZER 1 MK2703B REV D 042606MK2703B PLL AUDIO CLOCK SYNTHESIZER CLOCK SYNTHESIZER Pin Assignment AUDIO CLOCK OUTPUT SELECT TABLE S1 S0 CLK (MHz) X1 1 8 X2 0 0 8.192 VDD 2 7 S0 0 1 11.2896 GND 3 6 S1 1 0 12.288 27M 4 5 CLK 1 1 24.576 Key: 0 = Connect pin directly to ground 8-pin (150 mil) SOIC 1 = Connect pin directly to VDD Pin Descriptions Pin Pin Pin Pin Description Number Name Type 1 X1 XI Crystal Connection. Connect to a 27 MHz fundamental crystal or clock. 2 VDD Power Connect to +3.3 V or +5 V. 3 GND Power Connect to ground. 4 27M Output 27 MHz buffered reference clock output. 5 CLK Output Audio clock output per table above. 6 S1 Input Audio clock frequency select input 1. Determines CLK output per table above. Internal pull-up resistor. 7 S0 Input Audio clock frequency select input 0. Determines CLK output per table above. Internal pull-up resistor. 8 X2 XO Crystal connection to a 27 MHz crystal, or leave unconnected for clock output. External Components Decoupling Capacitor Series Termination Resistor As with any high-performance mixed-signal IC, the A 33 terminating resistor can be used next to the clock MK2703B must be isolated from system power supply noise outputs for trace lengths over one inch. to perform optimally. Crystal Load Capacitors A decoupling capacitor of 0.01F must be connected The total on-chip capacitance is approximately 16 pF. A between VDD and GND on pins 2 and 3. It must be parallel resonant, fundamental mode, AT cut 27 MHz crystal connected close to the MK2703B to minimize lead should be used. The device crystal connections should inductance. No external power supply filtering is required for include pads for small capacitors from X1 to ground and the MK2703B. from X2 to ground. These capacitors are used to adjust the IDT / ICS PLL AUDIO CLOCK SYNTHESIZER 2 MK2703B REV D 042606