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ADL5501 Datasheet(Fiches technique) 20 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 20 of 28
The square-domain filter at FLTR can be reduced to improve
response time, and the remaining ac residual can be decreased
by using the output filter, which has a smaller time constant.
OUTPUT DRIVE CAPABILITY AND BUFFERING
The ADL5501 is capable of sourcing an output current of
approximately 3 mA. The output current is sourced through the
on-chip, 100 Ω series resistor; therefore, any load resistor forms
a voltage divider with this on-chip resistance.
It is recommended that the ADL5501 drive high resistive loads
to preserve output swing. If an application requires driving a low
resistance load, a simple buffering circuit can be used, as shown
in Figure 49. Similar circuits can be used to increase or decrease
the nominal conversion gain (see Figure 47 and Figure 48). In
Figure 48, the AD8031 buffers a resistive divider to give half of
the slope. In Figure 47, the op amp gain of two doubles the slope.
Using other resistor values, the slope can be changed to an arbitrary
value. The AD8031 rail-to-rail op amp, used in these examples,
can swing from 50 mV to 4.95 V on a single 5 V supply and
operates at supply voltages down to 2.7 V. If high output current
is required (>10 mA), the AD8051, which also has rail-to-rail
capability, can be used down to a supply voltage of 3 V. It can
deliver up to 45 mA of output current.
100pF
0.1µF
0.01µF
ADL5501
VRMS
VPOS
COMM
5kΩ
5kΩ
5V
12.6V/V rms
AD8031
Figure 47. Output Buffering Options, Slope of 12.6 V/V rms at 900 MHz
100pF
0.1µF
0.01µF
ADL5501
VRMS
VPOS
COMM
5V
3.2V/V rms
AD8031
4kΩ
5kΩ
Figure 48. Output Buffering Options, Slope of 3.2 V/V rms at 900 MHz
100pF
0.1µF
0.01µF
ADL5501
VRMS
VPOS
COMM
5V
6.3V/V rms
AD8031
Figure 49. Output Buffering Options, Slope of 6.3 V/V rms at 900 MHz
VRMS OUTPUT OFFSET
The ADL5501 has a ±1 dB error detection range of about 30 dB,
as shown in Figure 10 to Figure 12 and Figure 16 to Figure 18.
The error is referred to the best-fit line defined in the linear region
of the output response. Below an input power of −20 dBm, the
response is no longer linear and begins to lose accuracy. In
addition, depending on the supply voltage, saturation of the
output limits the detection accuracy above 10 dBm. Calibration
points should be chosen in the linear region, avoiding the
nonlinear ranges at the high and low extremes.
10
0.01
0.1
1
–40 –35 –30 –25 –20 –15 –10
–5
0
5
10
15
INPUT (dBm)
Figure 50. Output vs. Input Level Distribution of 50 Devices,
Frequency 900 MHz, Supply 5.0 V
Figure 50 shows the distribution of the output response vs. the
input power for multiple devices. The ADL5501 loses accuracy at
low input powers as the output response begins to fan out. As the
input power is reduced, the spread of the output response increases
along with the error. Although some devices follow the ideal linear
response at very low input powers, not all devices continue the
ideal linear regression to a near 0 V y-intercept. Some devices
exhibit output responses that rapidly decrease, and some flatten
out. With no RF signal applied, the ADL5501 has a typical output
offset of 50 mV (with a maximum of 150 mV).




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Datasheet Download



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