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參數資料
型號: AD8361ARM
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調理
英文描述: LF to 2.5 GHz TruPwr⑩ Detector
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO8
封裝: MO-187-AA, MSOP-8
文件頁數: 10/16頁
文件大?。?/td> 306K
代理商: AD8361ARM
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
C
100pF
R1
75
CFLTR
1
2
3
4
5
6
7
8
0.01 F
100pF
+V
S
2.7
5.5V
RFIN
V rms
Figure 32. Basic Connections for Ground Referenced Mode
AD8361
VPOS
IREF
RFIN
PWDN
SREF
VRMS
FLTR
COMM
C
C
100pF
R1
75
CFLTR
1
2
3
4
5
6
7
8
0.01 F
100pF
+V
S
2.7
5.5V
RFIN
V rms
Figure 33. Basic Connections for Internal Reference Mode
AD8361
VPOS
IREF
RFIN
PWDN
SREF
VRMS
FLTR
COMM
C
C
100pF
R1
75
CFLTR
1
2
3
4
5
6
7
8
0.01 F
100pF
+V
S
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 V
S
/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
O
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
O
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
Intercept
(No Signal)
Reference
Mode
IREF
SREF
Output
Ground
Internal
Supply
VPOS
OPEN
VPOS
COMM
COMM
VPOS
Zero
0.350 V
V
S
/7.5
7.5 V
IN
7.5 V
IN
+ 0.350 V
7.5 V
IN
+ V
S
/7.5
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