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ADL5501 Datasheet(Fiches technique) 19 Page - Analog Devices

Numéro de pièce ADL5501
Description  50 MHz to 4 GHz TruPwr Detector
Télécharger  28 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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ADL5501
Rev. 0 | Page 19 of 28
Table 4. Waveform and Output Filter Effects on Residual AC
Output
Residual AC
Waveform
CFILT, COUT
V dc
mV p-p
mV rms
64QAM
1 nF,
0.5
83
11
(7.4 dB CF)
Open
1.0
175
21
2.0
394
47
Open,
0.5
49
5.5
0.1 μF
1.0
98
11
2.0
212
23
1 nF,
0.5
45
5.5
0.1 μF
1.0
93
11
2.0
200
24
W-CDMA RL
1 nF,
0.5
6.4
0.8
(3.4 dB CF)
Open
1.0
19
2.6
2.0
52
6.6
Open,
0.5
4.5
0.6
0.1 μF
1.0
16
2.2
2.0
36
4.9
1 nF,
0.5
3.1
0.5
0.1 μF
1.0
9.6
1.4
2.0
27
3.9
CDMA2000 DL
1 nF,
0.5
67
8.6
(6.7 dB CF)
Open
1.0
148
19
2.0
339
43
Open,
0.5
28
3.9
0.1 μF
1.0
56
7.9
2.0
119
17
1 nF,
0.5
26
3.7
0.1 μF
1.0
52
7.7
2.0
116
17
W-CDMA UL
1 nF,
0.5
204
32
TM1-64, 1 CR
Open
1.0
396
64
2.0
840
140
Open,
0.5
60
11
0.1 μF
1.0
112
21
2.0
227
42
1 nF,
0.5
56
11
0.1 μF
1.0
114
21
2.0
243
45
POWER CONSUMPTION, ENABLE, AND POWER-
ON/-OFF RESPONSE TIME
The quiescent current consumption of the ADL5501 varies with
the size of the input signal from approximately 1.1 mA for no
signal up to 6.2 mA at an input level of 0.7 V rms (10 dBm,
re 50 Ω). If the input is driven beyond this point, the supply
current increases sharply (as shown in Figure 6). There is little
variation in quiescent current with power supply voltage.
The ADL5501 can be disabled either by pulling the ENBL (Pin 5)
to COMM (Pin 4) or by removing the supply power to the device.
Disabling the device via the ENBL function reduces the leakage
current to less than 1 μA.
If the input of the ADL5501 is driven while the device is disabled
(ENBL = COMM), the leakage current of less than 1 μA increases
as a function of input level. When the device is disabled, the
output impedance increases to approximately 33.5 kΩ.
The turn-on time and pulse response is strongly influenced by
the size of the square-domain filter and output shunt capacitor.
Figure 45 shows a plot of the output response to an RF pulse on
the RFIN pin, with a 0.1 μF output filter capacitor and no
square-domain filter capacitor. The falling edge is particularly
dependent on the output shunt capacitance, as shown in Figure 45.
2ms/DIV
400mV rms RF INPUT
250mV rms
160mV rms
70mV rms
PULSED RFIN
Figure 45. Output Response to Various RF Input Pulse Levels,
Supply 3 V, Frequency 900 MHz,
Square-Domain Filter Open, Output Filter 0.1 μF
To improve the falling edge of the enable and pulse responses,
a resistor can be placed in parallel with the output shunt capacitor.
The added resistance helps to discharge the output filter
capacitor. Although this method reduces the power-off time,
the added load resistor also attenuates the output (see the
Output Drive Capability and Buffering section).
2ms/DIV
400mV rms RF INPUT
250mV rms
160mV rms
70mV rms
PULSED RFIN
Figure 46. Output Response to Various RF Input Pulse Levels,
Supply 3 V, Frequency 900 MHz,
Square-Domain Filter Open, Output Filter 0.1 μF with Parallel 1 kΩ
The square-domain filter improves the rms accuracy for high
crest factors (see the Selecting the Square-Domain Filter and
Output Low-Pass Filter), but it can hinder the response time.
For optimum response time and low ac residual, both the
square-domain filter and the output filter should be used.




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