LTC5597

1

Rev. 0

For more information www.analog.com

TYPICAL APPLICATION

FEATURES

DESCRIPTION

100MHz to 70GHz

Linear-in-dB RMS Power Detector with

35dB Dynamic Range

provides a very wide RF input bandwidth, from 100MHz

up to 70GHz. This makes the device suitable for a wide

range of RF and microwave applications, such as point-

to-point microwave links, instrumentation and power

control applications.

The DC output voltage of the detector is an accurate

representation of the average signal power applied to the

RF input. The response is linear-in-dB with 28.5mV/dB

logarithmicslopeovera35dBdynamicrangewithtypically

better than ±1dB accuracy. The detector is particularly

suited for measurement of waveforms with crest factor

(CF) as high as 12dB, and waveforms that exhibit a sig-

nificant variation of the crest factor during measurement.

To achieve higher accuracy and lower output ripple, the

averaging bandwidth can be externally adjusted by a ca-

pacitor connected between the FLTR and OUT pins.

The enable interface switches the device between active

measurement mode and a low power shutdown mode.

100MHz to 70GHz RMS Power Detector

Output Voltage vs Frequency

APPLICATIONS

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. patents, including 9330283, 9639719.

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Ultra Wide Matched Input Frequency Range:

100MHz to 70GHz

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35dB Linear Dynamic Range (< ±1dB Error)

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28.5mV/dB Logarithmic Slope

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±2dB Flat Response from 100MHz to 60GHz

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Accurate RMS Power Measurement of High Crest

Factors (Up to 12dB) Modulated Waveforms

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Low Power Shutdown Mode

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Low Supply Current: 33mA at 3.3V (Typical)

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Small 2mm × 2mm Plastic DFN8 Package

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I-Grade: −40°C to 105°C Rated

H-Grade: −40°C to 125°C Rated

with Guaranteed Log-Slope and Log-Intercept

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ESD Rating: 2500V HBM, 1500V CDM

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Point-to-Point Microwave Links

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SATCOM

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Instrumentation and Measurement Equipment

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Military Radios

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5G, LTE, WiFi, Wireless Networks

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RMS Power Measurement

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Receive and Transmit Gain Control

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RF PA Transmit Power Control

GND

GND

EN

OUT

GND

FLTR

3.3V

5597 TA01a

LTC5597

100nF

1

ENABLE

ADC

5597 TA01b

0.1

1

10

100

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

RF FREQUENCY (GHz)

0dBm

–5dBm

–10dBm

–15dBm

–20dBm

–25dBm

–30dBm

–35dBm

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