AD8307

DC to 500 MHz, 92 dB Logarithmic Amplifier
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Product Details

The AD8307 is the first logarithmic amplifier made available in an 8-lead (SOIC_N) package. It is a complete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive compression (successive detection) technique, providing a dynamic range of 92 dB to ±3 dB law-conformance and 88 dB to a tight ±1 dB error bound at all frequencies up to 100 MHz. It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2.7 V to 5.5 V at 7.5 mA is needed, corresponding to an unprecedented power consumption of only 22.5 mW at 3 V. A fast acting CMOS-compatible control pin can disable the AD8307 to a standby current of less than 150 µA.

Each of the cascaded amplifier/limiter cells has a small signal gain of 14.3 dB, with a -3 dB bandwidth of 900 MHz. The input is fully differential and at a moderately high impedance (1.1 kΩ in parallel with about 1.4 pF). The AD8307 provides a basic dynamic range extending from approximately -75 dBm (where dBm refers to a 50 Ω source, that is, a sine amplitude of about ±56 µV) up to +17 dBm (a sine amplitude of ±2.2 V). A simple input matching network can lower this range to -88 dBm to +3 dBm. The logarithmic linearity is typically within ±0.3 dB up to 100 MHz over the central portion of this range, and degrades only slightly at 500 MHz. There is no minimum frequency limit. The AD8307 can be used at audio frequencies of 20 Hz or lower.

The output is a voltage scaled 25 mV/dB, generated by a current of nominally 2 μA/dB through an internal 12.5 kΩ resistor. This voltage varies from 0.25 V at an input of −74 dBm (that is, the ac intercept is at −84 dBm, a 20 μV rms sine input), up to 2.5 V for an input of +16 dBm. This slope and intercept can be trimmed using external adjustments. Using a 2.7 V supply, the output scaling can be lowered, for example to 15 mV/dB, to permit utilization of the full dynamic range.

The AD8307 exhibits excellent supply insensitivity and temperature stability of the scaling parameters. The unique combination of low cost, small size, low power consumption, high accuracy and stability, very high dynamic range, and a frequency range encompassing audio through IF to UHF makes this product useful in numerous applications requiring the reduction of a signal to its decibel equivalent.

The AD8307 operates over the industrial temperature range of -40°C to +85°C, and is available in 8-lead SOIC and PDIP packages

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD8307 Material Declaration
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Overview

22 Reviews
20 out of 20 (100%) customers recommend this product.
Quality
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Reliability
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Most Helpful Review

by Anonymous
The AD8307 provides the front end for Field strengt measurement. Its sensitivity, bandwidth and dynamic range matches our needs very well, as part of RF level supervision in business radion facilities.

Most Recent Review

by Hans_AJJ
Nice compact product with good specifications and the costs are not too high

All Reviews

by Hans_AJJ, 11 Feb 15
Test
Nice compact product with good specifications and the costs are not too high
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by Brian, 26 Jan 15
AD8307
The AD8307 exhibits exceptional dynamic range and required only a few external components for our application.
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by Clax, 14 Jan 15
really performance and easy to use
The device is very efficient and greatly simplifies the development of the project.
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by Dick, 10 Dec 14
AD8307
The AD8307 is being used in a small self contained SMD circuit board for remote RF power measurement. The prototypes perform as expected and should be incorporated into a revised design in the near future.
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by FEP, 6 Aug 14
RMS reading detector
found the unit to be in compliance with data sheet values. Easy to breadboard and test for performance.
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by Anonymous, 8 Jul 14
SWR Power meter
This is a readout RF power and SWR from any SWR bridge.
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by grog57, 1 Jul 14
AD - Performance meets Price in the AD8307
This clever device from the minds at AD is another winner. It has incredible range and specifications, most importantly it performs in the circuit better than expected in an application that has it working at the bottom of it's frequency band. AD has excellent technical support and through their app engineers or forums questions get answered.
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by Loopy, 11 Jun 14
Simple RF Power Measurement
I used the AD8307 to make a simple meter for measuring RF power levels at HF and VHF. The meter was not intended for accurate measurements but rather to give quick and simple readings in the field from a battery powered handheld device using a moving coil meter for easier visual resolution.
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by Anonymous, 14 May 14
AD8307
Perfect for portable RF power measurement gear for field
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by Alectronix, 5 Mar 14
AD8307 log amps
These single-voltage (5V) ICs are delightfully easy to use, and perform well out to an amazing 500 MHz.
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by K3KO, 5 Mar 14
Use as a poor man's spectrum analyzer
First, I;m not an expert. I needed a device what would handle signals in the AD8307 range with detection and DC output. The goal was to produce a poor mans spectrum analyzer. I hooked up a sweep generator to a device being tested and looked at the output on a digital sampling scope. Big fat line. Required a low pas filter with cutoff of about 500 Hz to clean up the trace. A separate op amp circuit was also needed to shif the output near zero for the lowest level signal. The biggest problem is interfacig with the circuit being tested. Some kind hi-Z./low C probe is needed, It would have been nice if the documentation would give such a probe design. I've had limited success iwth a JFET source follower design. This device has the potential to meet my needs
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by Garth, 5 Mar 14
Use in a field strength meter
My experience is as an amateur radio enthusiast. I have used this amplifier in a rf field strength meter at 21MHz and have achieved the dynamic range that is claimed. I am now designing a 3 channel instrument for simultaneous measurement of the three components of E field. No problems so far.
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by DJPhil, 15 Jan 14
Thank you for not abandoning DIP
As a hobbyist designing for other hobbyists who may have to assemble my design it's extremely helpful to have these useful ICs in a DIP package. I don't suppose you guys would consider doing the same with the AD9850/AD9851 synthesizers, would you? Even SSOP is a relief compared to Flat No-lead stuff. Please keep us in mind when considering packages in the future. Electronics as a hobby is taking off once again!
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by Anonymous, 12 Dec 13
Review of AD8307
Performed fawlessly in the prototype. Now doing beta testing and experimental plots.
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by RIE, 12 Aug 13
Engineer
Low cost + high performance. Would be selected for our production
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by Logarithmic Amplifeir, 2 Jul 13
AD8037
I have not completed my evaluation. I also mishandled some of samples and damaged them. I was only able to do a bread board on one sample. So far it is perfect for my application, but would probably need a few more samples to some statistical check. For most of my testing the AD8307 was easy to use and was robust. I expect to introduce this part when ever I need log amp in a design.
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by Anonymous, 15 Mar 13
One thing bothers me is the 500MHz frequency barrier, i would like to see this to approx 1GHz (DC-1GHz) to be more compatible with modern standards.
One thing bothers me is the 500MHz frequency barrier, i would like to see this to approx 1GHz (DC-1GHz) to be more compatible with modern standards.
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by Anonymous, 15 Mar 13
very simple to use, good price, very high dynamic range
I would like a device with the very same dynamic range, but with extended frequency range: i.e. upper limit to 1 GHz
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by Anonymous, 30 Jan 13
Part of my winning contest entry.
I used an AD8307 for the detector in my NimbleSig III RF Analyzer contest entry project which took first place in the Renesas 2011 RX design contest. I ensured ADI was given credit in the documentation package. I plan to try the AD8310 in the future which looks like a slightly better fit for my next application. I imagine there are good reasons for using a different pinout for it compared to the AD8307. Many thanks for your support!
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by Anonymous, 23 Dec 12
Thanks from a Ham Radio experimenter
As you know I am a ham radio experimenter and want you to thanks for this sample that gave me the opportunity to build a QRP power meter. Right now it's used with a VDM to read the levels but I am going to add an Arduino controller to build a stand alone instrument. Many many thanks to gave me such opportunity to have a device that for me is too expensive just for experiments. As we ham says "best 73's" ( my sincerly regards) and Merry Xmas!
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by Anonymous, 25 Nov 12
This product integrates required features in a minimal size
The AD8307 provides the front end for Field strengt measurement. Its sensitivity, bandwidth and dynamic range matches our needs very well, as part of RF level supervision in business radion facilities.
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by Anonymous, 12 Nov 12
This product has great features
All features are ok and I do not need more features for my project.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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