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AD8319:  1 MHZ TO 10 GHZ, 40 DB LOG DETECTOR/CONTROLLER

The AD8319 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8319 maintains accurate log conformance for ...More

AD8319:  1 MHZ TO 10 GHZ, 40 DB LOG DETECTOR/CONTROLLER

Product Description

The AD8319 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8319 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 40 dB (re: 50 Ω) with error less than ±1 dB. The AD8319 has 8 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 μA when the device is disabled.

The AD8319 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention was paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.

The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the amplifier’s output to a magnitude corresponding to VSET. The AD8319 provides 0 V to (VPOS − 0.1 V) output capability at the VOUT pin, suitable for controller applications. As a measurement device, VOUT is externally connected to VSET to produce an output voltage, VOUT, that is a decreasing linear-in-dB function of the RF input signal amplitude.

The logarithmic slope is −22 mV/dB, determined by the VSET interface. The intercept is 15 dBm (re: 50 Ω, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.

The AD8319 is fabricated on a SiGe bipolar IC process and is available in a 2 mm × 3 mm, 8-lead LFCSP_VD for an operating temperature range of −40°C to +85°C.

Applications

  • RF transmitter PA setpoint controls and level monitoring
  • Power monitoring in radiolink transmitters
  • RSSI measurement in base stations, WLANs, WiMAX, and radars

    • Data Sheet, Rev. A, 3/07

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    • Wide bandwidth: 1 MHz to 10 GHz
    • High accuracy: ±1.0 dB over temperature
    • >40 dB dynamic range up to 8 GHz
    • Stability over temperature ±0.5 dB
    • Low noise measurement/controller
      output VOUT
    • Pulse response time: 8 ns/10 ns (fall/rise)
    • Small footprint 2 mm × 3 mm LFCSP_VD
    • Supply operation: 3.0 V to 5.5 V @ 22 mA
    • Fabricated using high speed SiGe process
    • RF Frequency (MHz): 1 to 10000
    • Dynamic Range (dB): 45dB
    • Temp Stability (dB): ±0.5dB
    • Response Time (ns typ): 6ns
    • Voltage Supply (V): 3 to 5.5
    • Supply Current : 22mA
    • Package: 8-Lead CSP

    Functional Block Diagram for AD8319

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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.