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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

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For detailed drawings and chemical composition please consult our  Package Site

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  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
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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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*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.