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Analog Devices Inc. ADRF6521 Dual Variable Gain Amplifier

Analog Devices Inc. ADRF6521 Dual Variable Gain Amplifier (VGA) provides full differential, low noise, and low distortion. The high spurious-free dynamic range over the gain range makes the ADRF6521 VGAs ideal for communication systems with dense constellations, multiple carriers, and nearby interferers.

The ADI ADRF6521 Dual VGA features a 21dB attenuation range with a typical voltage gain of 18dB, differential input impedance of 100Ω, differential output impedance of 16Ω, and ±1dB gain flatness bandwidth (2.5GHz). The ADRF6521 offers flexibility by operating from a single +5V supply or a range of dual supplies and consumes a total supply current of 200mA. When fully disabled, the ADRF6521 consumes a typical 25mA.

The ADRF6521 VGA is fabricated in an advanced silicon-germanium BiCMOS process and is available in a 20-lead, exposed pad, 3mm × 3mm LFCSP package. Performance is specified over a -40°C to +85°C temperature range.

Features

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

Applications

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

Block Diagram

Block Diagram - Analog Devices Inc. ADRF6521 Dual Variable Gain Amplifier

Associated Eval Board

Analog Devices Inc. EVAL-ADRF6521 Evaluation Board

Designed to demonstrate the ADRF6521 dual-ch VGA in a single-ended and differential configuration.

Learn Moreabout Analog Devices Inc. EVAL-ADRF6521 Evaluation Board View Productsrelated to Analog Devices Inc. EVAL-ADRF6521 Evaluation Board
Published: 2020-12-21 | Updated: 2024-12-13