Analog Devices Inc. HMC1122 Digital Step Attenuators

Analog Devices HMC1122 Digital Step Attenuators are 6-bit attenuators covering 0.1-6GHz with a 31.5dB attenuation control range in 0.5dB steps. Designed using an advanced silicon process, HMC1122 attenuators offer low power consumption, fast settling time, and high ESD robustness. The devices are optimized for excellent step accuracy and high linearity over frequency and temperature range. An on-chip regulator allows the HMC1122 attenuators to operate on a 3.3-5V single-supply operating range with no performance change.

HMC1122's bidirectional, interchangeable RF inputs and outputs are internally matched to 50Ω. The RF inputs and outputs do not require any external matching components.

HMC1122 attenuators incorporate a driver that provides both serial and parallel control of the attenuator. The devices also feature a user-selectable power-up state and a serial output port for cascading other serial-controlled components. Safe-state transitions ensure the safe operation of the components in the RF signal chain.


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


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

Block Diagram

Block Diagram - Analog Devices Inc. HMC1122 Digital Step Attenuators
เผยแพร่แล้ว: 2559-04-18 | อัปเดตแล้ว: 2565-03-11