Data Sheet

ADL5506

30 MHz to 4.5 GHz, 45 dB RF Detector

Rev. C

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FEATURES

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Complete RF detector function

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Typical dynamic range: 45 dB (±1.0 dB)

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Frequency range from 30 MHz to 4.5 GHz

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Excellent temperature stability

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Stable linear in decibel response

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Power on/off response time: 65 ns/145 ns (rise/fall)

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−5 dBm input power applied

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Operates from −40°C to +85°C

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Low power: 3.8 mA at 3.0 V

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Power supply voltage range from 2.5 V to 5.5 V

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Disable current <1 µA

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AEC-Q100 qualified for automotive applications

APPLICATIONS

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RSSI and TSSI for wireless terminal devices

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RF transmitter or receiver power measurement

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Automotive RF bidirectional amplifiers

GENERAL DESCRIPTION

The ADL5506 is a complete, low cost subsystem for the measure-

ment 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.

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.

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.

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 +400 mV rms (+5 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

Figure 1.