PDF MK3722 Data sheet ( Hoja de datos )

Número de pieza	MK3722
Descripción	VCXO PLUS AUDIO CLOCK
Fabricantes	IDT
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No Preview Available ! VCXO PLUS AUDIO CLOCK FOR STB DATASHEET MK3722 Description The MK3722 is a low cost, low jitter, high performance VCXO and PLL clock synthesizer designed to replace expensive discrete VCXOs and multipliers. The patented on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to cause the output clocks to vary by ±115 ppm. Using IDT’s analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 27 MHz pullable crystal input to produce a reference output and a selectable audio clock. IDT manufactures the largest variety of VCXO based timing devices for all applications. Consult IDT to eliminate VCXOs, crystals, and oscillators from your board. The frequency of the on-chip VCXO is adjusted by an external control voltage connected to VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Features • Packaged in 16-pin TSSOP • Pb (lead) free package • Replaces a VCXO and oscillator • Operating voltage of 3.3V • Provides output of 27 MHz plus audio clock • Uses an inexpensive 27 MHz pullable crystal • On-chip patented VCXO with pull range of 230 ppm (minimum) • VCXO tuning voltage of 0 to 3.3 V • Advanced, low power, sub-micron CMOS process Block Diagram S2:S0 VIN 3 27 MHz Pullable Crystal X1 X2 VDD 3 PLL/Clock Synthesis Circuitry Voltage Controlled Crystal Oscillator 3 GND PDTS ACLK 27MHz IDT™ VCXO PLUS AUDIO CLOCK FOR STB 1 MK3722 REV G 051310 1 page MK3722 VCXO PLUS AUDIO CLOCK FOR STB VCXO AND SYNTHESIZER AC Electrical Characteristics VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Typ. Max. Units Crystal Pullability VCXO Gain fP 0V< VIN < 3.3 V, Note 1 VIN = VDD/2 + 1 V, Note 1 + 100 80 ppm ppm/V Output Rise Time Output Fall Time Output Clock Duty Cycle Maximum Output Jitter, short term tOR 0.8 to 2.0 V, CL=15 pF tOF 2.0 to 0.8 V, CL=15 pF tD Measured at 1.65 V, CL=15 pF tJ CL=15 pF 0.75 1.5 0.75 1.5 40 50 60 +150 ns ns % ps Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Thermal Characteristics Parameter Symbol Conditions Thermal Resistance Junction to Ambient θJA Still air θJA 1 m/s air flow θJA 3 m/s air flow Thermal Resistance Junction to Case θJC Min. Typ. 78 70 68 37 Max. Units ° C/W ° C/W ° C/W ° C/W IDT™ VCXO PLUS AUDIO CLOCK FOR STB 5 MK3722 REV G 051310 5 Page

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