1. Products
  2. RF and Microwave
  3. Attenuators
  4. Digital Step Attenuators
  5. HMC1122


Features and Benefits

  • Attenuation range: 0.5 dB LSB steps to 31.5 dB
  • Low insertion loss
    • 1.1 dB at 1 GHz
    • 1.3 dB at 2 GHz
  • Typical step error: less than ±0.1 dB
  • Excellent attenuation accuracy
  • Safe state transitions
  • High linearity
    • Input 0.1dB compression (P0.1dB): 30 dBm typical
    • Input third-order intercept (IP3): 55 dBm typical
  • RF settling time (0.05 dB final RF output): 250 ns
  • Low phase shift error: 6° at 1 GHz
  • Single supply operation: 3.3 V to 5 V
  • ESD rating: Class 2 (2 kV HBM)
  • 24-lead, 4 mm × 4 mm LFCSP package: 16 mm2
  • Pin compatible to the HMC624A

Product Details

The HMC1122 is a 6-bit digital attenuator operating from 0.1 GHz to 6 GHz with a 31.5 dB attenuation control range in 0.5 dB steps.

The HMC1122 is implemented in a silicon process, offering very fast settling time, low power consumption, and high ESD robustness. The device features safe state transitions and optimized for excellent step accuracy and high linearity over frequency and temperature range. The RF input and output are internally matched to 50 Ω and do not require any external matching components. The design is bidirectional; therefore, the RF input and output are interchangeable.

The HMC1122 operates on a single supply ranging from 3.3 V to 5 V with no performance change due to an on-chip regulator.

The device incorporates a driver that provides both serial and parallel control of the attenuator. The device also features a user-selectable power-up state and a serial output port for cascading other serial controlled components.

The HMC1122 comes in a RoHS compliant, compact, 4 mm × 4 mm LFCSP package, and is pin compatible to the HMC624A.

A fully populated evaluation board is available.


  • Cellular infrastructure
  • Microwave radios and very small aperture terminals (VSATs)
  • Test equipment and sensors
  • IF and RF designs

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.

Evaluation Kits (1)

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
HMC1122LP4ME Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm w/ EP)
HMC1122LP4METR Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm w/ EP)
Wafer Fabrication Data

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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.