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AD8361 Fiches technique(PDF) 12 Page - Analog Devices |
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AD8361 Fiches technique(HTML) 12 Page - Analog Devices |
12 / 22 page AD8361 Data Sheet Rev. F | Page 12 of 22 APPLICATION INFORMATION Basic Connections Figure 36 through Figure 38 show the basic connections for the AD8361’s MSOP version in its three operating modes. In all modes, the device is powered by a single supply of between 2.7 V and 5.5 V. The VPOS pin is decoupled using 100 pF and 0.01 μF capacitors. The quiescent current of 1.1 mA in operating mode can be reduced to 1 μA by pulling the PWDN pin up to VPOS. A 75 Ω external shunt resistance combines with the ac-coupled input to give an overall broadband input impedance near 50 Ω. Note that the coupling capacitor must be placed between the input and the shunt impedance. Input impedance and input coupling are discussed in more detail below. The input coupling capacitor combines with the internal input resistance (Figure 37) to provide a high-pass corner frequency given by the equation IN C R C f π 2 1 dB 3 With the 100 pF capacitor shown in Figure 36 through Figure 38, the high-pass corner frequency is about 8 MHz. Figure 36. Basic Connections for Ground Reference Mode Figure 37. Basic Connections for Internal Reference Mode Figure 38. 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 modes of operation are set by the SREF and IREF pins. In addition to the ground reference mode shown in Figure 36, 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 37), the output voltage swing is shifted upward by an internal reference voltage of 350 mV. In supply referenced mode (Figure 38), an offset voltage of VS/7.5 is added to the output voltage. Table 4 summarizes the connections, output transfer function, and minimum output voltage (i.e., zero signal) for each mode. Output Swing Figure 39 shows the output swing of the AD8361 for a 5 V supply voltage for each of the three modes. It is clear from Figure 39 that operating the device in either internal reference mode or supply referenced mode reduces 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 reduces further as headroom decreases. Figure 40 shows the response of the AD8361 to a CW input for various supply voltages. Figure 39. Output Swing for Ground, Internal, and Supply Referenced Mode, VPOS = 5 V (MSOP Only) 1 2 3 4 8 7 6 5 AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM R1 75 0.01 F CC 100pF CFLTR 100pF +VS 2.7V – 5.5V RFIN V rms 1 2 3 4 8 7 6 5 AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM R1 75 0.01 F CC 100pF CFLTR 100pF +VS 2.7V – 5.5V RFIN V rms 1 2 3 4 8 7 6 5 AD8361 VPOS IREF RFIN PWDN SREF VRMS FLTR COMM R1 75 0.01 F CC 100pF CFLTR 100pF +VS 2.7V – 5.5V RFIN V rms 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 |
Numéro de pièce similaire - AD8361 |
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Description similaire - AD8361 |
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