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AD8361 Fiches technique(PDF) 12 Page - Analog Devices

No de pièce AD8361
Description  LF to 2.5 GHz TruPwr Detector
Download  22 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8361 Fiches technique(HTML) 12 Page - Analog Devices

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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


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