ADMV4821

RECOMMENDED FOR NEW DESIGNS

24 GHz to 29.5 GHz Transmitter/Receiver, Dual Polarization Beamformer

Analog Devices ADMV4821 Product Info

10 February 2026 5

Features

RF frequency range: 24 GHz to 29.5 GHz
16 configurable transmit channels
16 configurable receive channels
Dual polarization: 8 horizontal and 8 vertical channels
Fast TDD switching time using external pins
Matched, 50 Ω, single-ended RF inputs and outputs
Integrated transmitter power detectors and temperature sensor
High resolution, 6-bit vector modulators for phase control

High resolution, 6-bit and 5-bit DVGAs for amplitude control
Gain compensation over temperature
Memory for 256 beam positions
Single power supply required: 3.3 V with on-chip LDO regulator for 1.8 V
Adjustable power modes for power consumption reduction
3-wire or 4-wire SPI supporting up to a 61.44 MHz SPI clock speed
72-terminal, 10 mm × 10 mm, LGA package

Part details & applications

The ADMV4821 is a silicon germanium (SiGe), 24 GHz millimeterwave (mmW) to 29.5 GHz mmW 5G beamformer. The RF IC is highly integrated and contains 16 independent channels with both transmit and receive functionality. The ADMV4821 supports eight horizontal and eight vertical polarized antennas via the independent RFV and RFH inputs/outputs common pins.

In transmit mode, both the RFV and RFH input signals are split via two independent 1:8 power splitters and pass through the eight, independent, corresponding transmit channels. In this mode, each channel includes a vector modulator (VM) to control the phase and two digital variable gain amplifiers (DVGAs) to control the amplitude.

In receive mode, input signals pass through two sets of eight receive channels (either vertical or horizontal) and are combined via one independent 8:1 combiner connected to the RFV pin and one independent 8:1 combiner connected to the RFH pin. In this mode, each channel includes a VM to control the phase and a DVGA to control the amplitude.

The VM provides a full 360° phase adjustment range in either transmit or receive mode. The VM provides six bits of resolution for 5.625° phase steps.

In transmit mode, the total DVGA dynamic range adjustment range is 32.4 dB. The DVGAs provide five bits or six bits of resolution, resulting in 1.0 dB or 0.5 dB amplitude steps, respectively.

In receive mode, the DVGA allows for 17.1 dB of dynamic range adjustment. The DVGA also provides six bits of resolution, resulting in 0.5 dB amplitude steps. The DVGAs provide a flat phase response across the full gain range.

The transmitter channels contain individual power detectors to detect and calibrate the gain for each channel as well as the channel to channel gain mismatch. Directly connect the ADMV4821 RF ports to a patch antenna to create a dual polarization mmW 5G subarray.

Users can program the ADMV4821 by

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