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MAX2750_V1 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX2750_V1 Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 7 page  2.4GHz Monolithic Voltage-Controlled Oscillators Detailed Description Oscillator The MAX2750/MAX2751/MAX2752 VCOs are imple- mented as an LC oscillator topology, integrating all of the tank components on-chip. This fully monolithic approach provides an extremely easy-to-use VCO, equivalent to a VCO module. The frequency is con- trolled by a voltage applied to the TUNE pin, which is internally connected to the varactor. The VCO core uses a differential topology to provide a stable frequen- cy versus supply voltage and improve the immunity to load variations. In addition, there is a buffer amplifier following the oscillator core to provide added isolation from load variations and to boost the output power. Output Buffer The oscillator signal from the core drives an output buffer amplifier. The amplifier is internally matched to 50 Ω including an on-chip DC blocking capacitor. No external DC blocking capacitor is required, eliminating the need for any external components. The output amplifier has its own VCC and GND pins to minimize load-pulling effects. The amplifier boosts the oscillator signal to a level suitable for driving most RF mixers. Applications Information Tune Input The tuning input is typically connected to the output of the PLL loop filter. The loop filter provides an appropri- ately low-impedance source. The input may incorporate an extra RC filter stage to reduce high-frequency noise and spurious signals. Any excess noise on the tuning input is directly translated into FM noise, which can degrade the phase-noise performance of the oscillator. Therefore, it is important to minimize the noise intro- duced on the tuning input. A simple RC filter with low corner frequency is needed during testing in order to filter the noise present on the voltage source driving the tuning line. Layout Issues Always use controlled impedance lines (microstrip, coplanar waveguide, etc.) for high-frequency signals. Always place decoupling capacitors as close to the VCC pins as possible; for long VCC lines, it may be nec- essary to add additional decoupling capacitors located further from the device. Always provide a low-induc- tance path to ground, and keep GND vias as close to the device as possible. Thermal reliefs on GND pads are not recommended. OSCILLATOR CORE BIAS TUNE LOOP FILTER BYP 0.1 μF SHDN GND OUT VCC1 VCC VCC2 GND SHDN 220pF 220pF MAX2750 MAX2751 MAX2752 OUT TO MIXER/ SYNTHESIZER FROM SYNTHESIZER Figure 1. Typical Application Circuit 5 |
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Similar Description - MAX2750_V1 |
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