AD8310

Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier
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Product Details

The AD8310 is a complete, dc to 440 MHz demodulating logarithmic amplifier (log amp) with a very fast voltage mode output, capable of driving up to 25 mA into a grounded load in under 15 ns. It uses the progressive compression (successive detection) technique to provide a dynamic range of up to 95 dB to ±3 dB law conformance or 90 dB to a ±1 dB error bound 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 8 mA is needed, corresponding to a power consumption of only 24 mW at 3 V. A fast-acting CMOS-compatible enable pin is provided.

Each of the six cascaded amplifier/limiter cells has a small-signal gain of 14.3 dB, with a −3 dB bandwidth of 900 MHz. A total of nine detector cells are used to provide a dynamic range that extends from −91 dBV (where 0 dBV is defined as the amplitude of a 1 V rms sine wave), an amplitude of about ±40 μV, up to +4 dBV (or ±2.2 V). The demodulated output is accurately scaled, with a log slope of 24 mV/dB and an intercept of −108 dBV. The scaling parameters are supply- and temperature-independent.

The fully differential input offers a moderately high impedance (1 kΩ in parallel with about 1 pF). A simple network can match the input to 50 Ω and provide a power sensitivity of −78 dBm to +17 dBm. The logarithmic linearity is typically within ±0.4 dB up to 100 MHz over the central portion of the range, but it is somewhat greater at 440 MHz. There is no minimum frequency limit; the AD8310 can be used down to low audio frequencies. Special filtering features are provided to support this wide range.

The output voltage runs from a noise-limited lower boundary of 400 mV to an upper limit within 200 mV of the supply voltage for light loads. The slope and intercept can be readily altered using external resistors. The output is tolerant of a wide variety of load conditions and is stable with capacitive loads of 100 pF.

The AD8310 provides a unique combination of low cost, small size, low power consumption, high accuracy and stability, high dynamic range, a frequency range encompassing audio to UHF, fast response time, and good load-driving capabilities, making this product useful in numerous applications that require the reduction of a signal to its decibel equivalent.

The AD8310 is available in the industrial temperature range of −40°C to +85°C in an 8-lead MSOP package.

Applications

  • Conversion of signal level to decibel form
  • Transmitter antenna power measurement
  • Receiver signal strength indication (RSSI)
  • Low cost radar and sonar signal processing
  • Network and spectrum analyzers
  • Signal-level determination down to 20 Hz
  • True-decibel ac mode for multimeters

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.

Evaluation Kits

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Product Details

AD8310-EVALZ is a fully populated, 4-layer, FR4-based, full featured evaluation board designed to allow easy evaluation of all features of the AD8310. RF input and VLOG output SMA connections with single ended setups are featured. There is an option of full differential signaling on the RF input if the user desires. Access to the +5V/8 mA supply is achieved with clip leads to the VPOS and COMM testpoints; it has a range from +2.7 to +5.5V.


Documentation

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Tools & Simulations

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Design Tools

Reference Materials

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Design Resources

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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.

AD8310 Material Declaration
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Overview

7 Reviews
7 out of 7 (100%) customers recommend this product.
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Most Helpful Review

by Anonymous
I think this is an excellent product. The only thing that I would improve is temperature stability/linearity if this is possible. We do calibrate and compensate in software for this.

Most Recent Review

by Steve
Hello I used this system to measure VSWR. I recommend

All Reviews

by Steve, 10 Feb 15
Good linearity
Hello I used this system to measure VSWR. I recommend
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by Aquazono, 3 Dec 14
Quote good
Used as RF signal log amp. Quite good performance for the price, I'm very satisfied!
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by Testadapter, 5 Nov 14
TLM170
The integrated circuit amplifies residues of AC voltages. This voltage is then analyzed via the ADC. Is a clever trick.
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by aronb, 13 Nov 13
AD8310
The AD8310 is a very nice chip, was trying to use it as an envelope extractor... works well for pulses, however I needed more filtering than I could get easily due to the low number of cycles I had to work with - ultrasonic receive pulse about 5 cycles long at 10MHz. I would be very handy to have an ANALOG method of extracting or following a burst of signal (again like an ultrasonic return pulse) without having to use a Hilbert Transform i.e. having to go digital...I do miss some of the obsolete chips however... the AD639 Trig Chip is a big one... it comes in handy - Thank You Barry Gilbert ! ! ! ! ! Thanks for "Keeping it Analog" copyright 2013 Aron Bacs
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by Tak, 17 Sep 13
It's Interesting one.
I chose this device because of it was recommended by famous magazine's article. This device is very easy to use, I think. Also, performance is good. I'm going to select it when I design some electric circuit. thak you.
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by Anonymous, 14 Mar 13
excelent component
I won't use this component, because it's not fast enough for my application (beam power measurement). But if a faster version if this component will be produce, I'll bought some. My first test at lower frequency give me excellent result of power measurement, with a simple structure.
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by Anonymous, 22 Dec 12
AD8310 is GOOD but in the end Testing AD8307 for trials/production
I think this is an excellent product. The only thing that I would improve is temperature stability/linearity if this is possible. We do calibrate and compensate in software for this.
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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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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.