Le blog de l'entreprise Mingjiada Electronics Supply ADI HMC1122 0.5dB Step 6-Bit Silicon Digital Attenuator

Mingjiada Electronics Supply ADI HMC1122 0.5dB Step 6-Bit Silicon Digital Attenuator

Shenzhen Mingjiada Electronics is a long-term supplier of the [ADI] HMC1122 (HMC1122LP4ME) – a 6-bit silicon digital attenuator with 0.5 dB LSB. This device is designed for gain control, power conditioning and calibration in RF and microwave signal chains. It covers a frequency range of 0.1 GHz to 6 GHz, offers an attenuation range of 0 to 31.5 dB with a minimum step size of 0.5 dB, and is suitable for communications, test and measurement, radar and broadband RF systems.

Product Description Details
The HMC1122 (HMC1122LP4ME) is a 6-bit silicon digital attenuator from ADI, featuring a 0.5 dB LSB design and a total attenuation range of 31.5 dB. The device covers a wide frequency band from 0.1 GHz to 6 GHz and is suitable for RF links requiring fine-grained gain steps and fast switching. Compared to mechanical attenuators or discrete PIN diode solutions, silicon digital attenuators integrate the attenuation network and control logic onto a single chip, helping to reduce size, improve switching speed and simplify system calibration.
The HMC1122 is housed in a 24-pin, 4 mm × 4 mm LFCSP package and supports both parallel and serial (SPI-compatible) control modes. The control logic is compatible with CMOS/TTL levels, facilitating connection to FPGAs, MCUs or baseband controllers. The device operates at a typical supply voltage of 3.3 V to 5 V, making it suitable for implementing programmable attenuation control in systems such as communications equipment, instrumentation and phased array systems.
In terms of RF performance, the HMC1122 prioritises low insertion loss and high linearity. Its typical input IP3 reaches +55 dBm, whilst the input P1dB is approximately +30 dBm, helping to maintain attenuation accuracy and signal integrity in high-power signal environments.

Key specifications of the HMC1122:
Architecture: 6-bit digital attenuator, silicon process
Operating frequency: 0.1 GHz to 6 GHz
Attenuation step: 0.5 dB LSB
Total attenuation range: 0 to 31.5 dB
Insertion loss: 1.1 dB @ 1 GHz; 1.3 dB @ 2 GHz
Step error: typically <±0.1 dB
0.1 dB compression point (P0.1 dB): typically 30 dBm
Input third-order intermodulation (IP3): typically 55 dBm
RF stabilisation time (0.05 dB accuracy): 250 ns
Additional phase shift: 6° @ 1 GHz
Supply voltage: 3.3 V to 5 V single supply
Control interface: Serial SPI + parallel control, supports cascading
RF impedance: 50 Ω, bidirectional
Package: LFCSP-24, 4 mm × 4 mm
Operating temperature range: –40 °C to +85 °C

HMC1122 Product Features:
1. 0.5 dB LSB fine-step resolution; 6-bit control covering a 31.5 dB range
6-bit control provides 64 attenuation states; the 0.5 dB minimum step size meets the high-precision requirements of applications such as gain calibration, power level conditioning and temperature compensation. The total attenuation range of 31.5 dB covers the dynamic adjustment needs of most RF links.
2. Wide frequency band coverage from 0.1 to 6 GHz
The HMC1122 is suitable for common frequency bands used in cellular communications, Wi-Fi, microwave radio, satellite communications and test equipment, reducing the design burden of having to change attenuator models across different frequency bands.
3. High Linearity, Suitable for Medium-to-High Power Signal Links
Typical input IP3 of approximately +55 dBm and input P1dB of approximately +30 dBm help maintain low distortion in locations such as the receive front-end and transmit link gain control, thereby minimising the attenuator’s impact on system linearity.
4. Dual control modes: parallel and serial
The HMC1122 supports parallel control and SPI-compatible serial control. Designers can select either direct GPIO control or bus control depending on the system architecture, facilitating multi-device cascading and software calibration. The control logic is compatible with CMOS/TTL, offering flexible interface design.
5. Compact LFCSP Package for High-Density Layout
The 4 mm × 4 mm, 24-pin LFCSP package is suitable for space-constrained RF modules and array systems, helping to reduce PCB footprint and simplify the layout of multi-channel attenuator networks.

Typical applications of the HMC1122:
Cellular communications and base stations
Microwave and satellite communications
Test, measurement and ATE
Radar and phased array systems
Broadband communications and software-defined radio
Industrial and medical RF equipment

Supply Information
Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing distributor of the ADI product range — maintains a constant stock of the HMC1122 digital attenuator (HMC1122LP4ME) and supports sample requests, small-batch purchases and full-reel supply. For further information on the HMC1122 or to enquire about sample prices, please visit the Mingjiada Electronics website (https://www.integrated-ic.com/) for more supply details.
Tags: HMC1122LP4ME, HMC1122LP4M, HMC1122LP4, HMC1122LP, HMC1122L, HMC1122