Analog Devices Inc. ADRF57xx Digital Attenuators
Analog Devices ADRF57xx Digital Attenuators are silicon 4-bit/6-bit step attenuators with 30dB/31.5dB attenuation control range in 0.5dB/2dB steps. These attenuators operate in the ultrawideband frequency range of 9kHz to 40GHz with low insertion loss and excellent attenuation accuracy. The ADI ADRF57xx attenuators require a dual supply voltage of +3.3V and -3.3V. These devices feature Serial Peripheral Interface (SPI), parallel mode control, and Complementary Metal-oxide Semiconductor (CMOS)-/Low Voltage Transistor to Transistor Logic (LVTTL)-compatible controls. The RF ports of ADRF57xx attenuators are designed to match the characteristic impedance of 50Ω.
The ADRF5720/30 Digital Attenuators are mutual pin-compatible and are available in a 4mm × 4mm 24-terminal RoHS compliant LGA package. In contrast, the ADRF5721/31 attenuators are mutual pin-compatible and are available in a 2.5mm × 2.5mm 16-terminal RoHS compliant LGA package. Typical applications include test and instrumentation, industrial scanners, 5G millimeter wave cellular infrastructure, radars, Electronic Counter Measures (ECMs), microwave radios, and Very Small Aperture Terminals (VSATs).
Features
- Bandwidth up to 40GHz and beyond:
- Covers a wide range of frequency plans and applications
- Low insertion loss and up to 31.5dB attenuation range:
- Excellent accuracy and step error
- Flat characteristics in the full frequency band
- Tight distribution in relative phase
- Manufactured in advanced silicon technology:
- Fast glitch-free switching and settling time (ADRF5730 and ADRF5731)
- Low-frequency cut-off 9KHz (ADRF5720 and ADRF5721)
- Symmetric supply and no need for DC-blocks
- Robust ESD protection
- Repeatable performance and limited process variation
- Compact RoHS package in STM form
- Standard assembly with the reflow process
- Reduce PCB size and no external components
Specifications
- Frequency range:
- 9kHz/100MHz to 40GHz (ADRF5721 and ADRF5731)
- 9kHz/100MHz to 40GHz (ADRF5720 and ADRF5730)
- Attenuation step-range:
- 2dB to 30dB (ADRF5721 and ADRF5731)
- 0.5dB to 31.5dB (ADRF5720 and ADRF5730)
- Switching Time (Ton-off):
- 110ns/3.5µs (ADRF5721 and ADRF5731)
- 125ns/4µs (ADRF5720 and ADRF5730)
- Accuracy- step error at 30GHz:
- ±(0.5+7%) att.state to ±0.6dB (ADRF5721 and ADRF5731)
- ±(0.3+2%) att.state to ±0.6dB (ADRF5720 and ADRF5730)
- Package type:
- 16-terminal 2.5mm × 2.5mm LGA (ADRF5721 and ADRF5731)
- 24-terminal 4mm × 4mm LGA (ADRF5720 and ADRF5730)
- −40°C to 105°C operating temperature range
Applications
- RF&MW test and measurement equipment:
- Fast settling time reduce measurement time and increase accuracy
- Low insertion loss and high accuracy improves performance
- High power handling covers most of the design needs
- 5G cellular infrastructure:
- Both 28GHz and 39GHz mmW bands well covered
- SMT package reduces assembly cost
- Military radios, radars, and ECMs:
- Single component covers multiple bands
- Fast switching characteristics ideal for pulsed operation
- Non-reflective architecture ensures proper termination on the RF path
- Space applications:
- Process technology is immune to latch-up
Videos
Block Diagrams
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Associated Boards
Analog Devices Inc. ADRF57xx Eval Boards for Digital Attenuators
Evaluate ADRF57xx line (ADRF5720, ADRF5721, ADRF5730, and ADRF5731) of digital step attenuators.