ADL5501AKSZ-R7 Analog Devices Inc, ADL5501AKSZ-R7 Datasheet - Page 23

• 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

DRIFT OVER A REDUCED TEMPERATURE RANGE
Figure 53 shows the error over temperature for a 1.9 GHz input
signal. Error due to drift over temperature consistently remains
within ±0.25 dB and begins to exceed this limit only when the
ambient temperature goes above +25°C and below −10°C. For
all frequencies using a reduced temperature range, higher
measurement accuracy is achievable.
OPERATION BELOW 100 MHz
The ADL5501 works at frequencies below 100 MHz but exhibits a
slightly higher linearity error. Figure 54 shows the error distribution
of 12 devices at 50 MHz over temperature. When compared to
an ideal linear transfer function at ambient, the error of the
ADL5501 over temperature remains within ±0.5 dB for the
central 20 dB of the dynamic range. At the higher input power
levels, the error grows as the response becomes nonlinear. The
typical slope and intercept at 50 MHz are 4.5 V/V rms and
0.04 V, respectively.
and +85°C vs. +25°C Linear Reference, Frequency = 50 MHz, Supply = 5.0 V
Figure 54. Temperature Drift Distributions for 12 Devices at −40°C, +25°C,
–0.25
–0.50
–0.75
–1.00
1.00
0.75
0.50
0.25
Figure 53. Typical Drift at 1.9 GHz for Various Temperatures
–1
–2
–3
0
3
2
1
0
–25
–25
–20
–20
–15
–15
–10
–10
INPUT (dBm rms)
INPUT (dBm)
–5
–5
0
0
+85°C
+70°C
+50°C
+35°C
+25°C
5
5
10
10
+15°C
0°C
–10°C
–25°C
–40°C
15
15
Rev. B | Page 23 of 28
Due to the repeatability of the performance from part to part,
compensation can be applied to reduce the effects of temperature
drift and linearity error. To detect larger dynamic ranges at
lower frequencies, the transfer function at ambient can be
calibrated, thus eliminating the linearity error. This technique
is discussed in detail in the Calibration for Improved Accuracy
section. Figure 55 shows that the dynamic range within ±0.5 dB
error improves to 30 dB by using this method.
EVALUATION BOARD
Figure 56 shows the schematic of the ADL5501 evaluation
board. The layout and silkscreen of the evaluation board layers
are shown in Figure 57 and Figure 58. The board is powered by
a single supply in the 2.7 V to 5.5 V range. The power supply is
decoupled by 100 pF and 0.1 μF capacitors. Table 5 details the
various configuration options of the evaluation board.
Problems caused by impedance mismatch can arise when the
evaluation board is used to examine ADL5501 performance.
One way to reduce these problems is to put a coaxial 3 dB atten-
uator on the RFIN SMA connector. Mismatches at the source,
cable, and cable interconnection, as well as those occurring on
the evaluation board, can cause these problems.
A simple (and common) example of such a problem is triple
travel due to mismatch at both the source and the evaluation
board. Here the signal from the source reaches the evaluation
board, and mismatch causes a reflection. When that reflection
reaches the source mismatch, it causes a new reflection, which
travels back to the evaluation board, adding to the original signal
incident at the board. The resulting voltage varies with both
cable length and frequency dependence on the relative phase of
the initial and reflected signals. Placing the 3 dB pad at the input of
the board improves the match at the board and, thus, reduces
the sensitivity to mismatches at the source. When such precau-
tions are taken, measurements are less sensitive to cable length and
other fixture issues. In an actual application when the distance
between the ADL5501 and the source is short and well defined,
this 3 dB attenuator is not needed.
12 Devices at −40°C and +85°C, Frequency = 50 MHz, Supply = 5.0 V
–1
–2
–3
3
2
1
0
–25
Figure 55. Output Delta from +25°C Output Voltage for
–20
–15
–10
INPUT (dBm)
–5
0
5
ADL5501
10
15