ADL5501AKSZ-R7 Analog Devices Inc, ADL5501AKSZ-R7 Datasheet - Page 21

• Manufacturer Part Number: ADL5501AKSZ-R7
• Description: IC DETECTOR RF/IF TRUPWR SC70-6
• Manufacturer: Analog Devices Inc

Specifications of ADL5501AKSZ-R7

• Frequency: 50MHz ~ 6GHz
• Rf Type: General Purpose
• Input Range: -18dBm ~ 6dBm
• Accuracy: ±1dB
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 1.1mA
• Package / Case: 6-TSSOP, SC-88, SOT-363
• Frequency Range: 50MHz To 6GHz
• Supply Current: 1.1mA
• Supply Voltage Range: 2.7V To 5.5V
• Rf Ic Case Style: SC-70
• No. Of Pins: 6
• Operating Temperature Range: -40°C To +85°C
• Ic Function: RMS Detector IC
• Digital Ic Case Style: SC-70
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADL5501AKSZ-R7TR

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 approx-
imately 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
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.
Figure 47. Output Buffering Options, Slope of 12.6 V/V rms at 900 MHz
Figure 48. Output Buffering Options, Slope of 3.2 V/V rms at 900 MHz
Figure 49. Output Buffering Options, Slope of 6.3 V/V rms at 900 MHz
0.1µF
0.1µF
ADL5501
ADL5501
0.1µF
COMM
COMM
VPOS
VPOS
ADL5501
COMM
VPOS
VRMS
VRMS
100pF
100pF
AD8031
VRMS
100pF
4kΩ
5kΩ
buffers a resistive divider to give half of
5kΩ
AD8031
5kΩ
AD8031
AD8031
0.01µF
0.01µF
0.01µF
12.6V/V rms
5V
3.2V/V rms
6.3V/V rms
5V
5V
Rev. B | Page 21 of 28
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 addi-
tion, 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.
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).
0.01
0.1
10
Figure 50. Output vs. Input Level Distribution of 50 Devices,
1
–40
–35
Frequency = 900 MHz, Supply = 5.0 V
–30
–25
–20
INPUT (dBm)
–15
–10
–5
0
5
ADL5501
10
15