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AD8361 Fiches technique(PDF) 16 Page - Analog Devices |
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AD8361 Fiches technique(HTML) 16 Page - Analog Devices |
16 / 16 page –16– AD8361 REV. A AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM C1 0.1 F R1 75 1 2 3 45 6 7 8 RFIN C3 C4 0.1 F C2 100pF IREF PWDN VPOS SREF VRMS Figure 49. Characterization Board AD8361 CHARACTERIZATION BOARD RFIN PRUP +VS SREF IREF VRMS DC OUTPUT RF SIGNAL SMIQ038B RF SOURCE IEEE BUS PC CONTROLLER DC MATRIX / DC SUPPLIES / DMM DC SOURCES 3dB ATTENUATOR Figure 50. Characterization Setup 8-Lead micro_SOIC Package (RM-8) 0.009 (0.23) 0.005 (0.13) 0.028 (0.70) 0.016 (0.40) 6 0 0.037 (0.95) 0.030 (0.75) 85 4 1 0.122 (3.10) 0.114 (2.90) PIN 1 0.0256 (0.65) BSC 0.122 (3.10) 0.114 (2.90) 0.193 (4.90) BSC SEATING PLANE 0.006 (0.15) 0.002 (0.05) 0.016 (0.40) 0.010 (0.25) 0.043 (1.10) MAX 6-Lead SOT-23-6L Package (RT-6) 0.122 (3.10) 0.106 (2.70) PIN 1 0.118 (3.00) 0.098 (2.50) 0.075 (1.90) BSC 0.037 (0.95) BSC 1 3 4 5 6 2 0.071 (1.80) 0.059 (1.50) 0.009 (0.23) 0.003 (0.08) 0.022 (0.55) 0.014 (0.35) 10 0 0.020 (0.50) 0.010 (0.25) 0.006 (0.15) 0.000 (0.00) 0.051 (1.30) 0.035 (0.90) SEATING PLANE 0.057 (1.45) 0.035 (0.90) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Problems caused by impedance mismatch may arise using the evaluation board to examine the AD8361 performance. One way to reduce these problems is to put a coaxial 3 dB attenuator on the RFIN SMA connector. Mismatches at the source, cable, and cable interconnection, as well as those occurring on the evaluation board can cause these problems. A simple (and common) example of such problem is triple travel due to mismatch at both the source and the evaluation board. Here the signal from the source reaches the evaluation board and mismatch causes a reflection. When that reflection reaches the source mismatch, it causes a new reflection, which travels back to the evaluation board adding to the original signal inci- dent at the board. The resultant voltage will vary with both cable length and frequency dependent upon the relative phase of the initial and reflected signals. Placing the 3 dB pad at the input of the board improves the match at the board and thus reduces the sensitivity to mismatches at the source. When such precautions are taken, measurements will be less sensitive to cable length and other fixturing issues. In an actual application when the distance between AD8361 and source is short and well defined, this 3 dB attenuator is not needed. CHARACTERIZATION SETUPS Equipment The primary characterization setup is shown in Figure 50. The signal source used was a Rohde & Schwarz SMIQ03B, version 3.90HX. The modulated waveforms used for IS95 reverse link, IS95 nine active channels forward (Forward Link 18 setting), W-CDMA 4- and 15-channel were generated using the default settings coding and filtering. Signal levels were calibrated into a 50 Ω impedance. Analysis The conversion gain and output reference are derived using the coefficients of a linear regression performed on data collected in its central operating range (35 mV rms to 250 mV rms). This range was chosen to avoid areas of operation where offset distorts the linear response. Error is stated in two forms Error from Linear Response to CW waveform and Output Delta from 25 °C performance. The Error from Linear Response to CW waveform is the difference in output from the ideal output defined by the conversion gain and output reference. This is a measure of both the linearity of the device response to both CW and modulated waveforms. The error in dB uses the conversion gain multiplied times the input as its reference. Error from Linear Response to CW waveform is not a measure of absolute accuracy, since it is calculated using the gain and output reference of each device. But it does show the linearity and effect of modulation on the device response. Error from 25 °C performance uses the performance of a given device and waveform type as the reference; it is predomi- nantly a measure of output variation with temperature. |
Numéro de pièce similaire - AD8361 |
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Description similaire - AD8361 |
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