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AD8361ART-EVAL Datasheet(PDF) 10 Page - Analog Devices |
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AD8361ART-EVAL Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD8361 –10– REV. A With the 100 pF capacitor shown in Figures 32–34, the high- pass corner frequency is about 8 MHz. AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM CC 100pF R1 75 CFLTR 1 2 3 45 6 7 8 0.01 F 100pF +VS 2.7 – 5.5V RFIN V rms Figure 32. Basic Connections for Ground Referenced Mode AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM CC 100pF R1 75 CFLTR 1 2 3 45 6 7 8 0.01 F 100pF +VS 2.7 – 5.5V RFIN V rms Figure 33. Basic Connections for Internal Reference Mode AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM CC 100pF R1 75 CFLTR 1 2 3 45 6 7 8 0.01 F 100pF +VS 2.7 – 5.5V RFIN V rms Figure 34. Basic Connections for Supply Referenced Mode The output voltage is nominally 7.5 times the input rms voltage (a conversion gain of 7.5 V/V rms). Three different modes of operation are set by the pins SREF and IREF. In addition to the ground referenced mode shown in Figure 32, where the output voltage swings from around near ground to 4.9 V on a 5.0 V supply, two additional modes allow an offset voltage to be added to the output. In the internal reference mode, (Figure 33), the output voltage swing is shifted upward by an internal reference voltage of 350 mV. In supply referenced mode (Figure 34), an offset voltage of VS/7.5 is added to the output voltage. Table I summarizes the connections, output transfer function and mini- mum output voltage (i.e., zero signal) for each mode. Output Swing Figure 35 shows the output swing of the AD8361 for a 5 V supply voltage for each of the three modes. It is clear from Figure 35, that operating the device in either internal reference mode or supply referenced mode, will reduce the effective dynamic range as the output headroom decreases. The response for lower supply voltages is similar (in the supply referenced mode, the offset is smaller), but the dynamic range will be reduced further, as head- room decreases. Figure 36 shows the response of the AD8361 to a CW input for various supply voltages. INPUT – V rms 5.0 4.5 0.0 0 0.5 0.1 0.2 0.3 0.4 3.0 1.5 1.0 0.5 4.0 3.5 2.0 2.5 SUPPLY REF INTERNAL REF GROUND REF 0.6 0.7 0.8 Figure 35. Output Swing for Ground, Internal and Supply Referenced Mode. VPOS = 5 V (micro_SOIC Only) INPUT – V rms 5.5 1.5 0 0.5 0.1 0.2 0.3 0.4 4.0 3.0 2.5 2.0 5.0 4.5 3.5 1.0 0.5 0.0 5.5V 5.0V 3.0V 2.7V 0.6 0.7 0.8 Figure 36. Output Swing for Supply Voltages of 2.7 V, 3.0 V, 5.0 V and 5.5 V (micro_SOIC Only) Dynamic Range Because the AD8361 is a linear responding device with a nomi- nal transfer function of 7.5 V/V rms, the dynamic range in dB is not clear from plots such as Figure 35. As the input level is increased in constant dB steps, the output step size (per dB) will also increase. Figure 37 shows the relationship between the output step size (i.e., mV/dB) and input voltage for a nominal transfer function of 7.5 V/V rms. Table I. Connections and Nominal Transfer Function for Ground, Internal, and Supply Reference Modes Output Reference Intercept Mode IREF SREF (No Signal) Output Ground VPOS COMM Zero 7.5 VIN Internal OPEN COMM 0.350 V 7.5 VIN + 0.350 V Supply VPOS VPOS VS/7.5 7.5 VIN + VS/7.5 |
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