DATASHEET PLL AUDIO CLOCK SYNTHESIZER MK2703 Description Features The MK2703 is a low-cost, low-jitter, high-performance PLL Packaged in 8-pin SOIC clock synthesizer designed to replace oscillators and PLL Pb (lead) free package circuits in set-top box and multimedia systems. Using IDTs Uses an inexpensive, fundamental mode crystal or clock patented analog Phase Locked Loop (PLL) techniques, the device uses a 27 MHz crystal or clock input to produce a Supports MPEG sampling rates of 32 kHz, 44.1 kHz, 48 buffered reference clock and a selectable audio clock. kHz, and 96 kHz Patented zero ppm synthesis error in all clocks IDT manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. Consult All frequencies are frequency locked IDT to eliminate VCXOs, crystals and oscillators from your Advanced, low power, sub-micron CMOS process board. Operating voltage of 3.3 V or 5 V Industrial temperature version available The MK2703B is recommended for new designs 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 PLL AUDIO CLOCK SYNTHESIZER 1 MK2703 REV K 051310MK2703 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 MK2703 A 33 terminating resistor can be used next to the clock must be isolated from system power supply noise to perform outputs for trace lengths over one inch. 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 MK2703 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 MK2703. from X2 to ground. These capacitors are used to adjust the IDT PLL AUDIO CLOCK SYNTHESIZER 2 MK2703 REV K 051310