30 MHz to 4.5 GHz, 45 dB

RF Detector

Data Sheet

ADL5506

Rev. A

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FEATURES

Complete RF detector function

Typical dynamic range: 45 dB

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

APPLICATIONS

RSSI and TSSI for wireless terminal devices

RF transmitter or receiver power measurement

GENERAL DESCRIPTION

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.

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 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

Figure 1.

10dB

DET

10dB

DET

10dB

DET

10dB

DET

DET

+

–

CFLT

RFIN

COMM

OFFSET

COMPENSATION

V-I

BAND-GAP

REFERENCE

ENBL

VPOS

I-V

VLOG

ADL5506