30 MHz to 4.5 GHz, 45 dB
RF Detector
Data Sheet
ADL5506
FEATURES
GENERAL DESCRIPTION
Complete RF detector function
Typical dynamic range: 45 dB
The ADL5506 is a complete, low cost subsystem for the
measurement of RF signals in the 30 MHz to 4.5 GHz frequency
range, with a typical dynamic range of 45 dB, intended for use
in a wide variety of wireless terminal devices. It provides a wider
dynamic range and better accuracy than is possible using
discrete diode detectors. In particular, its temperature stability
is excellent over −40°C to +85°C.
Frequency range from 30 MHz to 4.5 GHz
Excellent temperature stability
Stable linear in decibel response
Power on/off response time: 65 ns/145 ns (rise/fall)
−5 dBm input power applied
Operates from −40°C to +85°C
Low power: 3.8 mA at 3.0 V
Power supply voltage range from 2.5 V to 5.5 V
Disable current <1 μA
Its high sensitivity allows measurement of low power levels, thus
reducing the amount of power that needs to be coupled to the
detector. It is essentially a voltage responding device, with a
typical dynamic range of 45 dB.
APPLICATIONS
For convenience, the signal is internally ac-coupled, using a
5 pF capacitor and a broadband 50 Ω match, with an external
shunt resistor of 52 Ω. This high-pass coupling, with a corner at
approximately 19 MHz, determines the lowest operating frequency.
Therefore, the source can be dc grounded.
RSSI and TSSI for wireless terminal devices
RF transmitter or receiver power measurement
The ADL5506 output increases from approximately 0.14 V to a
little over 1 V as the input signal level increases from 1.25 mV rms
(−45 dBm) to 224 mV rms (0 dBm). The output is proportional
to the logarithm of the input power level; that is, the reading is
presented directly in decibels and is scaled about 18 mV/dB at
900 MHz. A capacitor can be connected between the VLOG pin
and the CFLT pin when it is desirable to increase the time
interval over which averaging of the input waveform occurs.
The ADL5506 is available in a 6-ball WLCSP and consumes
3.8 mA from a 3.0 V supply. When powered down, the typical
disable supply current is <1 μA.
FUNCTIONAL BLOCK DIAGRAM
CFLT
V-I
I-V
–
+
VLOG
DET
DET
DET
DET
DET
RFIN
VPOS
ENBL
BAND-GAP
REFERENCE
10dB
10dB
10dB
10dB
OFFSET
COMPENSATION
ADL5506
COMM
Figure 1.
Rev. A
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Tel: 781.329.4700 ©2013–2017 Analog Devices, Inc. All rights reserved.
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