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MAX2308ETI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX2308ETI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer _______________________________________________________________________________________ 9 Voltage-Controlled Oscillator, Buffers, and Quadrature Generation The LO signal for downconversion is provided by a voltage-controlled oscillator (VCO) consisting of an on- chip differential oscillator, and an off-chip high-Q reso- nant network. Figure 4 shows a simplified schematic of the VCO oscillator. Multiband operation is supported by the MAX2306 with dual VCOs. VCO_H and VCO_L are selectable with the MODE pin or the VCO_SEL (VS) control bit. They oscillate at twice the desired LO fre- quency. For applications requiring an external LO, the VCOs can be bypassed with the VCO_BYP (VB) control bit. The MAX2309 buffers the output of the VCO and pro- vides this signal at the LOOUT pin. This signal is enabled by the BUFEN (BE) control bit or by the BUFEN control pin. The frequency of this signal is selected by the BUF_DIV (BD) control bit, and can be either the VCO frequency or half the VCO frequency. Quadrature downconversion is realized by providing in- phase (I) and quadrature-phase (Q) components of the LO signal to the LO ports of the demodulator described above. The quadrature LO signals are generated by dividing the VCO output frequency using two latches. Figure 1. MAX2306 Typical Operating Circuit MAX2306 BYP BYP FM- FM+ CDMA+ CDMA FM 3-WIRE DAC 0.1 µF 0.01 µF 0.068 µF 47pF 2pF 33pF 0.01 µF 10k Ω 2.4k Ω 10k Ω 33pF 47pF 33nH 0.01 µF 680 Ω CDMA- LOCK VGC VCC VCC VCC VCC DATA CLK QOUT+ QOUT- EN TANKH- IOUT- IOUT+ REF GND VCC MODE TANKH+ TANKL- GND CP_OUT BYP SHDN TANKL+ 0.01 µF VCC 47pF 10k Ω 47k Ω Q 10k Ω 2pF 33pF 10k Ω 10k Ω 33pF I 33nH |
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