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CN-0245 Datasheet(PDF) 4 Page - Analog Devices |
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CN-0245 Datasheet(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0245 Circuit Note Rev. 0 | Page 4 of 5 Table 1. ADF4350 RF Output Filter Component Value (DNI = Do Not Insert) Frequency Range (MHz) ZBIAS L1 (nH) L2 (nH) C1a (pF) C1c (pF) C2a (pF) C2c (pF) C3a (pF) C3c (pF) a. 500–1300 27 nH|| 50 Ω 3.9 3.9 DNI 4.7 DNI 5.6 DNI 3.3 b. 850–2450 19 nH || (100 Ω in position C1c) 2.7 2.7 3.3 100 Ω 4.7 DNI 3.3 DNI c. 1250–2800 50 Ω 0 Ω 3.6 DNI DNI 2.2 DNI 1.5 DNI d. 2800–4400 3.9 nH 0 Ω 0 Ω DNI DNI DNI DNI DNI DNI 120pF 120pF 0.1µF ZBIAS ZBIAS LOIP LOIN ADL5380 ADF4350 RFOUTA+ RFOUTA– 3.3V C1a C2a C3a C1a C2a C3a C1c C2c C3c 1nF 1nF L1 L2 L1 L2 12 13 3 4 Figure 8. ADF4350 RF Output Filter Schematic COMMON VARIATIONS The interface discussed above is applicable to any PLL with differential LO outputs and to any 1 × LO or 2 × LO-based I/Q demodulator. The ADL5382 is a 1 × LO-based I/Q demodulator that operates from 700 MHz to 2700 MHz and provides slightly higher IP3 than the ADL5380. TheAD8347 (1 × LO) and AD8348 (2 × LO) are lower power I/Q demodulators that integrate front-end variable gain amplifiers and fixed-gain baseband amplifiers. CIRCUIT EVALUATION AND TEST The circuits shown in Figure 4 and Figure 6 were implemented using the CN-0134 evaluation board (CFTL-0134EVALZ) and the ADL5387 or ADL5380 evaluation boards. The CN-0134 evaluation platform includes the ADF4350, pads for an LO filter, and differential LO outputs to SMA connectors. The ADF4350 must be programmed, and the software is contained on the CD that accompanies the evaluation board. Table 2 provides the ordering guide for the various evaluation boards. The CN-0134 evaluation board is configured by default to an 850 MHz to 2450 MHz filter design as specified in Table 1. To implement an alternative filter, the appropriate components must be swapped out. Table 2. Evaluation Board Information Evaluation Board ADL5387 ADL5387-EVALZ ADL5380 Low Band (400 MHz to 3 GHz) Mid Band (3 GHz to 4 GHz) ADL5380-30A-EVALZ ADL5380-29A-EVALZ CN-0134 CFTL-0134-EVALZ Equipment Needed • Windows XP, Windows Vista (32-bit), or Windows 7 (32-bit) PC with USB port • Evaluation boards as listed in Table 2 • RF source (Rohde & Schwarz SMT06 or equivalent) • Spectrum analyzer (Rohde & Schwarz FSEA30 or equivalent) • Power supplies: • ADL5387-EVALZ: +5 V • ADL5380-30A-EVALZ: +5 V • CFTL-0134-EVALZ: +5.5 V Test The CN-0134 evaluation platform allows easy evaluation and has an integrated crystal oscillator on board. A PC with the ADF4350 software is required to program the synthesizer to the desired LO frequency. The ADL5387/ADL5380 quadrature demodulator will downconvert the RF frequency to baseband. The differential I and Q baseband outputs are applied to the FSEA spectrum analyzer in the FFT mode, and image rejection is measured. Additional documentation can be found in the following design support packages for CN-0245, CN-0134, and CN-0144: CN-0245 Design Support Package: www.analog.com/CN0245-DesignSupport CN-0134 Design Support Package: www.analog.com/CN0134-DesignSupport CN-0144 Deign Support Package: www.analog.com/CN0144-DesignSupport |
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