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MAX2202EWTT10 Datasheet(PDF) 6 Page - Maxim Integrated Products

No. de Pieza. MAX2202EWTT10
Descripción  RMS Power Detector
Descarga  8 Pages
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Fabricante  MAXIM [Maxim Integrated Products]
Página de inicio  http://www.maxim-ic.com
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MAX2202EWTT10 Datasheet(HTML) 6 Page - Maxim Integrated Products

   
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Applications Information
Detector RF Input
The MAX2202 generally requires a terminating resistor
and series capacitor between the directional coupler’s
output and detector RF input. As shown in the
Typical
Operating Characteristics, an S11 of less than -9dB is
possible when a terminating resistor of 50Ω and series
capacitor of 220pF are used at the input. S11 of the
MAX2202 RFIN port without input matching is shown in
Table 2 and can be downloaded from Maxim’s website.
In cases where the detector is connected to two or
more directional couplers, as shown in Figure 1, the
50Ω terminating resistor can be eliminated.
Detector Voltage Output
The output of the MAX2202 goes to an ADC for further
processing by the baseband system. Connect a series
10kΩ resistor and a shunt capacitor to the detector out-
put to reduce residual amplitude ripple. The shunt
capacitor should be 4.7nF for WCDMA and 15nF for
NCDMA.
Enable Logic Level
The device features an enable input (ENA) that allows
the device to be put into shutdown. For normal opera-
tion, drive ENA high. For device shutdown, drive ENA
low. The ENA pin is DC biased through a resistor. The
value of the resistor is recommended to be greater than
RMS Power Detector
6
_______________________________________________________________________________________
PA 1
PA 2
COUPLER 1
COUPLER 2
10
Ω
10
Ω
50
Ω
50
Ω
ENABLE
RMS
DETECT
BUFFER
BIAS
DETECTOR
OUTPUT
MAX2202
Figure 1. System Level Connection
FREQ
(MHz)
S11
(dB)
S11
(PHASE)
FREQ
(MHz)
S11
(dB)
S11
(PHASE)
300
-1.63
-34.1
1560
-1.37
-156.4
360
-1.69
-39.6
1620
-1.35
-162.4
420
-1.75
-44.9
1680
-1.35
-168.0
480
-1.77
-50.2
1740
-1.35
-173.7
540
-1.77
-55.9
1800
-1.36
-179.2
600
-1.75
-61.4
1860
-1.36
175.3
660
-1.74
-66.9
1920
-1.41
170.0
720
-1.72
-72.6
1980
-1.35
164.8
780
-1.70
-78.6
2040
-1.37
159.6
840
-1.62
-84.2
2100
-1.34
154.5
900
-1.59
-90.2
2160
-1.36
149.2
960
-1.53
-96.2
2220
-1.37
144.2
1020
-1.52
-102.2
2280
-1.37
139.2
1080
-1.45
-108.4
2340
-1.39
134.5
1140
-1.46
-114.5
2400
-1.37
129.5
1200
-1.40
-120.5
2460
-1.39
124.7
1260
-1.40
-126.5
2520
-1.38
119.9
1320
-1.39
-132.6
2580
-1.40
115.2
1380
-1.37
-138.9
2640
-1.39
110.4
1440
-1.35
-144.6
2700
-1.40
105.7
1500
-1.37
-150.6
Table 2. RF Input S11
Note: VCC = 2.8V, S11 measured at RFIN bump.


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