AD8361ART-REEL Analog Devices Inc, AD8361ART-REEL Datasheet - Page 12
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AD8361ART-REEL
Manufacturer Part Number
AD8361ART-REEL
Description
IC PWR DETECTOR 2.5GHZ SOT-23
Manufacturer
Analog Devices Inc
Datasheet
1.AD8361-EVAL.pdf
(24 pages)
Specifications of AD8361ART-REEL
Rohs Status
RoHS non-compliant
Frequency
100MHz ~ 2.5GHz
Rf Type
Cellular, CDMA, W-CDMA
Input Range
0 ~ 700mV
Accuracy
±0.25dB
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
1.1mA
Package / Case
SOT-23-6
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AD8361
APPLICATIONS
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
With the 100 pF capacitor shown in Figure 36 through Figure 38,
the high-pass corner frequency is about 8 MHz.
f
3
RFIN
RFIN
dB
Figure 37. Basic Connections for Internal Reference Mode
Figure 36. Basic Connections for Ground Reference Mode
=
0.01µF
75Ω
0.01µF
75Ω
2
R1
R1
π
×
100pF
100pF
C
C
C
1
C
C
C
×
100pF
100pF
R
1
2
3
4
1
2
3
4
IN
VPOS
IREF
RFIN
PWDN
VPOS
IREF
RFIN
PWDN
+V
+V
AD8361
AD8361
S
S
2.7V – 5.5V
2.7V – 5.5V
COMM
COMM
VRMS
VRMS
SREF
SREF
FLTR
FLTR
8
7
6
5
8
7
6
5
CFLTR
CFLTR
V rms
V rms
Rev. C | Page 12 of 24
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 V
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.
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
RFIN
Figure 38. Basic Connections for Supply Referenced Mode
0
Supply Referenced Mode, VPOS = 5 V (MSOP Only)
Figure 39. Output Swing for Ground, Internal, and
0.01µF
75Ω
S
/7.5 is added to the output voltage. Table 4
R1
0.1
100pF
INTERNAL REF
C
C
0.2
100pF
1
2
3
4
VPOS
IREF
RFIN
PWDN
0.3
+V
INPUT (V rms)
S
AD8361
2.7V – 5.5V
SUPPLY REF
0.4
COMM
VRMS
SREF
FLTR
GROUND REF
0.5
8
7
6
5
CFLTR
0.6
0.7
V rms
0.8