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ATR2730-TLSY Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATR2730-TLSY Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 18 page 6 4903C–DAB–03/07 ATR2730 [Preliminary] 3.4 Voltage-controlled Oscillator A voltage-controlled oscillator supplies an LO signal to the mixer. An equivalent circuit of this oscillator is shown in Figure 10-2 on page 14. In the application circuits (Figure 10-3 on page 15 and Figure 11-1 on page 16), a ceramic coaxial resonator is applied to the oscillator's TANK and VREF pins. It should be noted that V ref has to be blocked carefully. Figure 11-1 shows a different application where the oscillator is overdriven by an external oscillator. In either case, a DC path at a low impedance must be established between the TANK and VREF pins. The output signal of the oscillator is fed to the LO divider block of the frequency synthesizer unit which locks the VCO’s frequency on the frequency of a reference oscillator. Figure 9-1 on page 13 shows the typical phase-noise performance of the oscillator in locked state. 3.5 Overall Properties of the Signal Path The overall gain of this circuit amounts to 24 dB, the gain-control range is about 30 dB. With a new AGC concept in the amplifier and mixer, the ATR2730 reaches better intermodulation dis- tances (DIM3) at higher IF-output power levels. 3.6 Power Save Mode For VPSM > 2V (pin 1) the power consumption in the analog part (gain-controlled amplifier and mixer and gain-controlled circuitry) is reduced by 80%. The VCO and the PLL is not influenced by the power-down mode. 3.7 Frequency Synthesizer The frequency synthesizer block consists of a reference oscillator, a reference divider, an LO divider in order to divide the frequency of the internal oscillator, a tri-state phase detector, a lock detector, a programmable charge pump, a loop filter amplifier, a control interface, and a test interface. The control interface is accessed by three control pins, CI, SI1 and SI2. The test inter- face provides test signals which represent output signals of the reference and the LO divider. The purpose of this unit is to lock the frequency f VCO of the internal VCO on the frequency fref of the reference signal applied to the input pin OSCB phase-locked loop according to the following equation: f VCO = SF × fref /SFref where: SF = 2464, SF ref is the scaling factor of the reference divider according to Table 3-1 |
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