概览

优势和特点

  • Dual, Matched VGAs
  • Maximum gain: 18 dB
  • Continuous gain control range: 20 dB
  • Bandwidth: ±1 dB gain flatness: >2.9GHz
  • IMD2/3 (1.5 V p-p composite output):
    • @ 1 GHz: <−55 dBc
    • @ 2.9 GHz: <−35 dBc
  • HD2/3 (1.5 V p-p CW output):
    • 330 MHz Fundamental Tone: <−55 dBc
    • 950 MHz Fundamental Tone: <−35 dBc
  • Noise figure:
    • 10 dB at maximum gain @ 500 MHz
    • 14 dB at max gain @ 2GHz
    • NF decreases dB-for-dB with gain backoff
  • 100 Ω differential input impedance
  • 16 Ω differential output impedance
  • Programmable
    • DC output offset control: > ± 400 mV
    • Output common-mode control: > ± 200 mV
  • Dual supply operation with power-down feature
    • ±2.5V (nominal)

产品详情

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 20 dB of continuous analog gain control with a maximum gain of +18 dB. The differential input impedance is 100 Ω, while the differential output impedance is 16 Ω. The −1 dB bandwidth is 2.9 GHz. The output buffers are capable of driving 1.5 V p-p into 100 Ω loads at better than 55 dBc nominal for the third-order intermodulation distortion (IMD3) though 1GHz. Variable output dc offset control is accomplished with the OFS1 & OFS2 pins, while the output common-mode can be controlled with the VOCM pin.

The ADRF6521 flexibly operates on a single 5V supply or from a dual supply of ± 2.5 and consumes a maximum supply current of 180 mA. When fully disabled, it consumes ≤10 mA. The ADRF6521 is fabricated in an advanced silicon-germanium BiCMOS process and is available in a 20-lead, exposed pad 3 mm x 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

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