Overview

Features and Benefits

  • Dual, matched VGAs
  • Maximum voltage gain: 18 dB
  • Gain control attenuation range: 21 dB typical for TA = 25°C
  • ±1 dB gain flatness bandwidth: 2.5 GHz typical
  • IMD2 and IMD3 (1.5 V p-p output level)
    • −56.8 dBc typical and −75 dBc typical, respectively, at VGN = 1.5 V, 980 MHz and 1000 MHz tones
  • HD2 and HD3 (1.5 V p-p output level)
    • −75 dBc typical and −73.7 dBc typical, respectively, at VGN = 1.5 V, fundamental at 500 MHz
    • −55.9 dBc typical and −57.5 dBc typical, respectively, at VGN = 1.5 V, fundamental at 1 GHz
  • Noise figure:
    • 10.5 dB typical at maximum gain and at 500 MHz
    • 14.8 dB at maximum gain and at 2 GHz
    • Noise figure decreases dB for dB with gain backoff
  • 100 Ω differential input impedance
  • ≤ 16 Ω differential output impedance
  • Programmable
    • Output DC offset nominal range: ± 400 mV
    • Output common-mode control: > ± 200 mV for VOCM = ±0.2 V
  • Single- or dual-supply operation with power-down feature
    • Single supply: VPOS = 5 V, VNEG = 0 V (nominal)
    • Dual supply: VPOS = 3 V, VNEG = −2 V (nominal)

Product Details

The ADRF6521 is a dual, fully differential, low noise and low distortion variable gain amplifier (VGA). The high spurious-free dynamic range over the gain range makes the ADRF6521 ideal for communication systems with dense constellations, multiple carriers, and nearby interferers.

The VGA has a 21 dB attenuation range with a typical voltage gain of 18 dB. The differential input impedance is 100 Ω, while the differential output impedance is 16 Ω. The ±1 dB gain flatness bandwidth is 2.5 GHz. The output buffers are capable of swinging 1.5 V p-p into 100 Ω loads at >55 dBc for second-order and third-order intermodulation distortion (IMD2 and IMD3), and for second and third harmonic distortion (HD2 and HD3) from low frequency to 1 GHz. Variable output dc offset control is accomplished with the OFS1 and OFS2 pins, and the output common-mode can be controlled with the VOCM pin.

The ADRF6521 flexibly operates from a single +5 V supply or from a range of dual supplies and consumes a total supply current of 200 mA. When fully disabled, it consumes 25 mA typical. The ADRF6521 is fabricated in an advanced silicon-germanium BiCMOS process and is available in a 20-lead, exposed pad, 3 mm × 3 mm LFCSP. Performance is specified over the −40°C to +85°C temperature range.

Applications

  • Point-to-point and point-to-multipoint radios
  • Baseband IQ receivers
  • Diversity receivers
  • ADC drivers
  • Instrumentation
  • Medical

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.