AD8309

PRODUCTION

5 MHz TO 500 MHz, 100 dB Demodulating Logarithmic Amplifier with Limiter Output

Data Sheet (Rev. B) Product Selection Table
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Overview

  • 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

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.
AD8309
5 MHz TO 500 MHz, 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309-fbl AD8309-pc
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Documentation

Data Sheet 1

Application Note 3

Technical Articles 7

Evaluation Design File 1

Frequently Asked Question 1

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Tools & Simulations

ADIsimRF

ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

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ADIsimPLL™

ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.

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S-Parameter 1

Evaluation Kits

EVAL-AD8309

AD8309 Evaluation Board

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Product Details

AD8309-EVALZ is a full featured, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all features of the AD8309. RF input, limiter output and VLOG output SMA connections with single ended setups are featured. There is an option of full differential signaling on the RF input and limiter output at card edge if the user desires. Access to the +5V/16 mA supply is achieved with clip leads to the Vs and COM testpoints; it has a range from +2.7 to +6.5V.
EVAL-AD8309
AD8309 Evaluation Board

Latest Discussions

18 Weeks Ago
Output impedance of the Vlog Pin of AD8309
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Unable to obtain Log output at the Limiter Output pin
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