AD8307 DC to 500 MHz, 92 dB Logarithmic Amplifier

The AD8307 is the first logarithmic amplifier made available in an 8-lead SOIC_N package. It is a complete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive compression (successive detection) technique, providing a dynamic range of 92 dB to ±3 dB law conformance and 88 dB to a tight ±1 dB error bound at all frequencies up to 100 MHz. The AD8307 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 7.5 mA is needed. A fast acting CMOS-compatible control pin can disable the AD8307 to a standby current of 150 μA.

The AD8307 operates over the industrial temperature range of −40°C to +85°C and is available in an 8-lead SOIC package and an 8-lead PDIP.

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 (to 120 dB)
  • Signal level determination down to 20 Hz
  • True decibel ac mode for multimeters

Features and Benefits
  • Complete multistage logarithmic amplifier
  • 92 dB dynamic range: –75 dBm to +17 dBm to –90 dBm using matching network
  • Single supply of 2.7 V minimum at 7.5 mA typical
  • DC to 500 MHz operation, ±1 dB linearity
  • Slope of 25 mV/dB, intercept of –84 dBm
  • Highly stable scaling over temperature
  • Fully differential dc-coupled signal path
  • 100 ns power-up time, 150 µA sleep current
    • RF & Microwave
    Data Sheets
    Documentnote
    AD8307: Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier Data Sheet (Rev. E)PDF 501 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
    AD8307ANZ Production8 ld PDIPOTH 50-40 to 85C7.196.07Y
    AD8307AR Production8 ld SOICOTH 98-40 to 85C8.37.01N
    AD8307AR-REEL Production8 ld SOICREEL 2500-40 to 85C07.01N
    AD8307AR-REEL7 Production8 ld SOICREEL 750-40 to 85C8.37.01N
    AD8307ARZ Production8 ld SOICOTH 98-40 to 85C7.196.07Y
    AD8307ARZ-REEL Production8 ld SOICREEL 2500-40 to 85C06.07Y
    AD8307ARZ-RL7 Production8 ld SOICREEL 750-40 to 85C7.196.07Y
    Reference Materials
    Datasheet
    AD8307: Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier Data Sheet (Rev. E) ad8307
    Other
    Detecting Fast RF Bursts using Log Amps ad640
    Design a Logamp RF Pulse Detector ad640
    Design and Operation of Automatic Gain Control Loops for Receivers in Modern... ad8369
    Make Precise Base-Station Power Measurements ad640
    Log Amps and Directional Couplers Enable VSWR Detection ad640
    AN-1040: RF Power Calibration Improves Performance of Wireless Transmitters (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
    AN-691: RF检波器的低频工作特性 (Rev. 0) ad8307
    Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs) ad640
    Measuring VSWR and Gain in Wireless Systems ad640
    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
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