100 MHz to 6 GHz

TruPwr™ Detector

ADL5500

Rev. A

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FEATURES

True rms response

Excellent temperature stability

±0.1 dB accuracy vs. temperature over top 8 dB of input range

Up to 30 dB input dynamic range at 3.9 GHz

50 Ω input impedance

1250 mV rms, +15 dBm, maximum input

Single-supply operation: 2.7 V to 5.5 V

Low power: 3 mW at 3 V supply

RoHS compliant

APPLICATIONS

Measurement of CDMA2000, W-CDMA, and QPSK-/QAM-

based OFDM, and other complex modulation waveforms

RF transmitter or receiver power measurement

5

0.03

–25

15

INPUT (dBm)

0.1

1

–20

–15

–10

–50

510

Figure 1. Output vs. Input Level, Supply 3 V, Frequency 1.9 GHz

GENERAL DESCRIPTION

The ADL5500 is a mean-responding power detector for use

in high frequency receiver and transmitter signal chains from

100 MHz to 6 GHz. It is easy to apply, requiring only a single

supply between 2.7 V and 5.5 V and a power supply decoupling

capacitor. The input is internally ac-coupled and has a nominal

input impedance of 50 Ω. The output is a linear-responding dc

voltage with a conversion gain of 6.4 V/V rms at 900 MHz. The

on-chip, 1 kΩ series resistance at the output combined with an

external shunt capacitor creates a low-pass filter response that

reduces the residual ripple in the dc output voltage.

The ADL5500 is intended for true power measurement of

simple and complex waveforms. The device is particularly

useful for measuring high crest factor (high peak-to-rms ratio)

signals, such as CDMA2000, W-CDMA, and QPSK/QAM-

based OFDM waveforms.

The ADL5500 offers excellent temperature stability with near

0 dB measurement error across temperature. The high accuracy

range, centered around +3 dBm at 900 MHz, offers ±0.1 dB

error from −40°C to +85°C over an 8.5 dB range. The ADL5500

reduces calibration requirements with low drift across a 30 dB

range over temperature and process variations.

The ADL5500 operates from −40°C to +85°C and is available in

a 4-ball, 1.0 mm × 1.0 mm wafer-level chip scale package. It is

FUNCTIONAL BLOCK DIAGRAM

RFIN

BUFFER

VPOS

VRMS

COMM

ERROR

AMP

i

i

TRANS-

CONDUCTANCE

CELLS

ADL5500

1k

Ω

INTERNAL FILTER

CAPACITOR

Figure 2.