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MAX2754EUA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX2754EUA Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 8 page  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. Incorporate an extra RC filter stage to reduce high-frequency noise and spuri- ous 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 to filter the noise present on the voltage source driving the tuning line. Two-Level FSK Applications The MAX2754 is designed for use in FSK applications operating in the 2.4GHz to 2.5GHz ISM band. Specifically, it is targeted for those systems which utilize a direct TX modulation architecture in which the VCO is directly modu- lated with the data signal during the transmit (TX) mode. The VCO in these systems runs at half the RF output frequency and is used in conjunction with a frequency doubler to produce the final LO signal for both RX and TX modes of operation. Figure 2 shows a typical applications circuit. To com- pute R1, R2, R3, and R4, determine the modulation voltage center point (VMODB = +1.4V). Compute the required modulation voltage deviation as follows: 1.2GHz VCO with Linear Modulation Input 6 _______________________________________________________________________________________ MODULATION VOLTAGE, VMOD (V) 1.0 fNOM fNOM + fMOD fNOM - fMOD 2.0 1.5 2.5 0.5 Figure 1. Modulation Frequency Deviations Characteristics SHDN FROM BASEBAND DIGITAL CONTROLLER GND2 OUT VCC VCC MOD GND1 R1 R2 R4 R3 TUNE FROM PLL LOOP FILTER VREG 330nF OUT TO MIXER/ SYNTHESIZER 330nF INVERTED CMOS SIGNAL MAX2754 REG AND BIAS MOD. FILTER OSCILLATOR CORE LINEAR MODULATION INTERFACE VCC Figure 2. Typical Application Circuit for Two-Level FSK |
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