5962-9864601QEA中文资料5 MHz–400 MHz 100 dB High Precision Limiting-Logarithmic Amplifier数据手册ADI规格书

描述 Description

PRODUCT DESCRIPTION
The AD8306 is a complete IF limiting amplifier, providing both an accurate logarithmic (decibel) measure of the input signal (the RSSI function) over a dynamic range of 100 dB, and a programmable limiter output, useful from 5 MHz to 400 MHz.
It is easy to use, requiring few external components. A single supply voltage of +2.7 V to +6.5 V at 16 mA is needed, corresponding to a power consumption of under 50 mW at 3 V, plus the limiter bias current, determined by the application and typically 2 mA, providing a limiter gain of 90 dB when using 200 Ω loads. A CMOS-compatible control interface can enable the AD8306 within about 500 ns and disable it to a standby current of under 1 µA.
The six cascaded amplifier/limiter cells in the main path have a small signal gain of 12.04 dB (×4), with a –3 dB bandwidth of 850 MHz, providing a total gain of 72 dB. The programmable output stage provides a further 18 dB of gain. The input is fully differential and presents a moderately high impedance (1 kΩ in parallel with 2.5 pF). The input-referred noise-spectral-density, when driven from a terminated 50 Ω, source is 1.28 nV/√Hz, equivalent to a noise figure of 3 dB. The sensitivity of the AD8306 can be raised by using an input matching network.
Each of the main gain cells includes a full-wave detector. An additional four detectors, driven by a broadband attenuator, are used to extend the top end of the dynamic range by over 48 dB.FEATURES
   Complete, Fully Calibrated Log-Limiting IF Amplifier
   100 dB Dynamic Range: –91 dBV to +9 dBV
   Stable RSSI Scaling Over Temperature and Supplies:
      20 mV/dB Slope, –95 dBm Intercept
      60.4 dB RSSI Linearity up to 200 MHz
   Programmable Limiter Gain and Output Current
      Differential Outputs to 10 mA, 2.4 V p-p
      Overall Gain 90 dB, Bandwidth 400 MHz
      Constant Phase (Typical 656 ps Delay Skew)
   Single Supply of +2.7 V to +6.5 V at 16 mA Typical
   Fully Differential Inputs, RIN = 1 kV, CIN = 2.5 pF
   500 ns Power-Up Time, <1 mA Sleep Current
  
APPLICATIONS
   Receivers for Frequency and Phase Modulation
   Very Wide Range IF and RF Power Measurement
   Receiver Signal Strength Indication (RSSI)
   Low Cost Radar and Sonar Signal Processing
   Instrumentation: Network and Spectrum Analyzers

特性 Features

   Complete, Fully Calibrated Log-Limiting IF Amplifier
   100 dB Dynamic Range: –91 dBV to +9 dBV
   Stable RSSI Scaling Over Temperature and Supplies:
      20 mV/dB Slope, –95 dBm Intercept
      60.4 dB RSSI Linearity up to 200 MHz
   Programmable Limiter Gain and Output Current
      Differential Outputs to 10 mA, 2.4 V p-p
      Overall Gain 90 dB, Bandwidth 400 MHz
      Constant Phase (Typical 656 ps Delay Skew)
   Single Supply of +2.7 V to +6.5 V at 16 mA Typical
   Fully Differential Inputs, RIN = 1 kV, CIN = 2.5 pF
   500 ns Power-Up Time, <1 mA Sleep Current
  

应用 Application

Receivers for Frequency and Phase Modulation
   Very Wide Range IF and RF Power Measurement
   Receiver Signal Strength Indication (RSSI)
   Low Cost Radar and Sonar Signal Processing
   Instrumentation: Network and Spectrum Analyzers