ADL5513

RECOMMENDED FOR NEW DESIGNS

1 MHz TO 4 GHz, 80 dB Logarithmic Detector / Controller

Data Sheet (Rev. B) Product Selection Table
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Overview

  • Wide bandwidth: 1 MHz to 4 GHz
  • 80 dB dynamic range (±3 dB)
  • Constant dynamic range over frequency
  • Stability over −40°C to +85°C temperature range: ±0.5 dB
  • Operating temperature range: −40°C to +125°C
  • Sensitivity: −70 dBm
  • Low noise measurement/controller output (VOUT)
  • Pulse response time: 21 ns/20 ns (fall/rise)
  • Single supply operation: 2.7 V to 5.5 V @ 31 mA
  • Power-down feature: 1 mW @ 5 V
  • Small footprint LFCSP
  • Fabricated using high speed SiGe process

The ADL5513 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 ADL5513 maintains accurate log conformance for signals up to 4 GHz. The input dynamic range is typically 80 dB (referred to 50 Ω) with error less than ±3 dB and 74 dB with error less than ±1 dB. That dynamic range is held nearly constant over the entire 4 GHz frequency range. The ADL5513 has a 20 ns response 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 voltage of 2.7 V to 5.5 V is required to power the device. Current consumption is 31 mA, and it decreases to 200 μA when the device is disabled. 

The ADL5513 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 has been 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 output to a magnitude corresponding to VSET. The ADL5513 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 increases linear-in-dB with RF input signal amplitude.

The logarithmic slope is 21 mV/dB, determined by the VSET interface. The intercept is -88 dBm (referred to 50 Ω, continuous wave input, 900 MHz) using the INHI input. These parameters are very stable against supply and temperature variations.

The ADL5513 is fabricated on a SiGe bipolar IC process and is available in a 3 mm × 3 mm, 16-lead LFCSP package for the −40°C to +125°C operating temperature range. A fully populated evaluation board is available.

Applications

  • RF transmitter power amplifier linearization and gain/power control
  • Power monitoring in radio link transmitters
  • RSSI measurement in base stations, WLAN, WiMAX, RADAR

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    ADL5513
    1 MHz TO 4 GHz, 80 dB Logarithmic Detector / Controller
    ADL5513-fbL ADL5513 Pin Configuration
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    Documentation

    Data Sheet 1

    Application Note 2

    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-ADL5513

    ADL5513 Evaluation Board

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    Product Details

    ADL5513-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/50 mA power supply. The power supply should be connected to the test loops labeled VPOS and GND. The RF input signal is applied through the SMA connector labeled RFIN. The output signal is accessible through the SMA connector labeled VOUT. The temperature adjust node is connected through a test loop mounted on the circuit board. Optionally a voltage divider powered by VPOS can be constructed using resistors, R8 and R9. The circuit board can also accommodate a 26 pin header through which the power supply, ground, temperature adjust node and output signal pins are accessible. The circuit board ships without this header installed.
    EVAL-ADL5513
    ADL5513 Evaluation Board

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