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AD8309:  5 - 500 MHz, 100 dB Demodulating Logarithmic Amplifier with Limiter Output

The AD8309 is a 500 MHz detecting logarithmic amplifier, based on the successive detection technique. This "log amp" is useful for received signal strength indication (RSSI) and phase detection in cellular base stations, radar and other radio transceiver applications.

It provides a dynamic range of 100 dB with an accuracy of ±0.4 dB over the central 80 dB and operates up to 500 MHz. The ...More

AD8309:  5 - 500 MHz, 100 dB Demodulating Logarithmic Amplifier with Limiter Output

Product Description

The AD8309 is a 500 MHz detecting logarithmic amplifier, based on the successive detection technique. This "log amp" is useful for received signal strength indication (RSSI) and phase detection in cellular base stations, radar and other radio transceiver applications.

It provides a dynamic range of 100 dB with an accuracy of ±0.4 dB over the central 80 dB and operates up to 500 MHz. The logarithmic output is proportional to the logarithm of the input signal, providing a 0.4 V to 2.5 V DC signal over the 100 dB input range. A limiter output is also provided which amplifies the input signal by 100 dB, providing a stable limited output with a maximum of ±100 ps phase skew. This limiter output is useful for demodulating FSK and PSK modulated signals.

The AD8309 operates from a single 2.7 V to 5.5 V dc power supply, drawing 20 mA typical. It is supplied in a 16 pin plastic TSSOP package.

An evaluation board is available for this product and may be ordered using the following product number: AD8309-EVAL. Schematic and layout for this evaluation board is contained in the product datasheet.

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  • Complete Multistage Log-Limiting IF Amplifier
  • 100 dB Dynamic Range: –78 dBm to +22 dBm (Re 50 O)
  • Programmable Limiter Gain and Output Current
    Differential Outputs to 10 mA, 2.4 V p-p
    Overall Gain 100 dB, Bandwidth 500 MHz
    Constant Phase (Typical 680 ps Delay Skew)
  • 500 ns Power-Up Time, <1 mA Sleep Current
  • Stable RSSI Scaling Over Temperature
    and Supplies:
    20 mV/dB Slope, –95 dBm Intercept
    ±0.4 dB RSSI Linearity up to 200 MHz
  • Single Supply of +2.7 V to +6.5 V at
    16 mA Typical
  • Fully Differential Inputs,
    RIN = 1kΩ, CIN = 2.5 pF
  • RF Frequency (MHz): 5 to 500
  • Dynamic Range (dB): 100dB
  • Temp Stability (dB): ±1dB
  • Phase Accuracy (deg): ±3Deg
  • Response Time (ns typ): 67ns
  • Voltage Supply (V): 2.7 to 6.5
  • Supply Current : 16mA
  • Limiter Output: Yes
  • AC Linearity (± dB): 1dB
  • Power Consumption (mW): 80mW
  • Package: 16-Lead TSSOP

Functional Block Diagram for AD8309

AD8309 Diagram
Functional Block Diagram for AD8309

Similar Products

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Part# Product Description RF Frequency (MHz) Dynamic Range (dB) Temp Stability (dB) Response Time (ns typ) Voltage Supply (V) Supply Current Package Price* (1000-4999)
AD606 Limiter Output - 80 - 400 4.5 to 5.5 13 16-Lead DIP, 16-Lead SOIC $22.00
AD640 Military Specified Part Available - 50 ±1 10 +/- 4.5 to +/- 7.5 44 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC $36.48
AD641 Military Specified Part Available - 44 ±1 10 +/- 4.5 to +/- 7.5 44 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC $32.82
AD8302 Dual-Channel Gain and Phase Outputs 2,700 60 ±1 60 2.7 to 5.5 19 14-Lead TSSOP $12.14
AD8306 Military Specified Part Available 5 to 400 100 ±1 73 2.7 to 5.5 16 16-Lead SOP $14.67
AD8307 High Dynamic Range dc to 500 92 ±1 400 2.7 to 5.5 8 8-Lead SOIC/DIP $6.07
AD8309 Limiter Output 5 to 500 100 ±1 67 2.7 to 6.5 16 16-Lead TSSOP $7.84
AD8310 High Dynamic Range dc to 440 100 ±1 15 2.7 to 5.5 8 8-Lead SOIC $4.00
AD8311 Low Power for Battery Operation 100 to 2500 50 ±0.5 150 2.7 to 5.5 8.5 WLCSP $1.27
AD8312 Low Power for Battery Operation 50 to 3500 45 ±0.5 70 2.7 to 5.5 4.2 WLCSP $1.27
AD8313 Industry Standard 100 to 2500 70 ±1.25 40 2.7 to 5.5 14 8-Lead uSOIC $7.99
AD8314 Industry Standard 100 to 2700 45 ±1 70 2.7 to 5.5 4.5 8-Lead uSOIC/CSP $1.10
AD8315 Low Power for Battery Operation 100 to 2500 50 ±1 150 2.7 to 5.5 8.5 8-Lead uSOIC $4.00
AD8317 Available in Die 1 to 10000 55 ±0.5 6 3 to 5.5 22 8-Lead CSP $3.98
AD8318 Integrated Temp Sensor 1 to 8000 70 ±0.5 10 4.5 to 5.5 68 16-Lead CSP $5.05
AD8319 Pin-compatible with AD8317 1 to 10000 45 ±0.5 6 3 to 5.5 22 8-Lead CSP $1.77
ADL5513 125°C Operation, Broadband 1 to 4000 80 ±0.5 20 2.7 to 5.5 31 16-Lead CSP $5.56
ADL5519 Dual-Channel AD8317 1 to 10000 62 ±0.5 6 3.3 to 5.5 56 32-Lead LFCSP $5.04
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* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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Model
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Status
Status indicates the current lifecycle of the product. This can be one of 4 stages:
  • Pre-Release: The model has not been released to general production, but samples may be available.
  • Production: The model is currently being produced, and generally available for purchase and sampling.
  • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
  • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
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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*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.