AD8309 5 MHz TO 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 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.

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.

Features and Benefits
  • 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 & Microwave
    Data Sheets
    Documentnote
    AD8309: 5 MHz-500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output Data Sheet (Rev. B)PDF 311 kB
    Application Notes
    Documentnote
    AN-1040: RF Power Calibration Improves Performance of Wireless Transmitters (Rev. 0)PDF 152 kB
    AN-691: Operation of RF Detector Products at Low Frequency (Rev. 0)PDF 778 kB
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD8309ARU Production16 ld TSSOPOTH 96-40 to 85C11.49.06N
    AD8309ARU-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C09.06N
    AD8309ARUZ Production16 ld TSSOPOTH 96-40 to 85C9.877.84Y
    AD8309ARUZ-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C07.84Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD8309-EVALZEvaluation Board100.19Y
    Reference Materials
    AD8309: 5 MHz-500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output Data Sheet (Rev. B) ad8309
    AD8309: 5 MHz-500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output Data Sheet (Rev. B) ad8309
    AD8309: 5至500 MHz、100 dB解调对数放大器，提供限幅器输出数据手册 (Rev. B) ad8309
    AD8309: 5至500 MHz、100 dB解调对数放大器，提供限幅器输出数据手册 (Rev. B) ad8309
    AN-1040: RF Power Calibration Improves Performance of Wireless Transmitters (Rev. 0) ad8307
    AN-691: RF检波器的低频工作特性 (Rev. 0) ad8307
    AN-1040: RF功率校准提高无线发射机的性能 (Rev. 0) ad8307
    AN-691: Operation of RF Detector Products at Low Frequency (Rev. 0) ad8307
    Design and Operation of Automatic Gain Control Loops for Receivers in Modern... ad8369
    RF Source Booklet adf9010
    Measurement and Control of RF Power, Part I ad640
    Measurement and Control of RF Power, Part II ad640
    Measurement and Control of RF Power, Part III ad640
    Log Amps and Directional Couplers Enable VSWR Detection ad640
    Measuring VSWR and Gain in Wireless Systems ad640
    Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs) ad640
    Detecting Fast RF Bursts using Log Amps ad640
    Make Precise Base-Station Power Measurements ad640
    Design a Logamp RF Pulse Detector ad640
    Products 产品服务
    Manufacturers 生产厂家
    Sales 联系购买
    ©1993 - 2024 BDTIC