Analog Devices ADMV8818 digitally tunable RF filter
A 2 GHz to 18 GHz digitally tunable high-pass/low-pass RF filter chip from Analog Devices, controlled over SPI. It is used in test and measurement gear, military and radar systems, satellite communications, and industrial or medical RF equipment that needs programmable band selection.
recommendation
It should stay because the ADMV8818 is current Analog Devices silicon still recommended for new designs in 2025, the evaluation board is still sold, and the kernel driver continues to receive real bug fixes (most recently in April 2025). Deployments are niche rather than mass-market, but the hardware is chip-specific so no other driver could replace it.
repository signals
sources
- git.kernel.org
Upstream file history shows the driver was added in 2021 and received multiple substantive fixes in 2023-2025, with latest substantive touches on 2025-04-22.
- analog.com
Analog Devices lists ADMV8818 as 'recommended for new designs' and describes it as a 2 GHz to 18 GHz digitally tunable high-pass/low-pass filter for test, military/radar, satellite, industrial, and medical equipment.
- analog.com
Analog Devices still advertises the EVAL-ADMV8818 evaluation board, indicating ongoing commercial availability and support ecosystem.
- cateee.net
LKDDb shows CONFIG_ADMV8818 present continuously from Linux 5.17 through current HEAD, with SPI and DT bindings for adi,admv8818.
- wiki.analog.com
Analog Devices documents this exact Linux IIO filter driver and the supported EVAL-ADMV8818 platform, indicating a maintained vendor-supported Linux use case.
codex reasoning notes (technical)
Real SPI IIO hardware driver for the Analog Devices ADMV8818 RF tunable filter. Local shell inspection of drivers/iio/filter/admv8818.c identified the device; local git log showed active maintenance, including four substantive bug-fix commits plus one cleanup on 2025-04-22, so this is not abandonment territory. I attempted lore-first checking via shell `lei q`, but `lei` was not installed; separate web searches against lore.kernel.org returned no removal/deprecation hits, so there is no visible active upstream removal discussion. URLs were obtained by web search for Analog Devices/LKDDb pages; the git.kernel.org log URL is a canonical recall URL built from the locally observed path/history. Hardware is still sold new in 2025, but deployments are niche RF/defense/test-industrial rather than mass-market, so deployments_today is low. No natural replacement driver exists because this is a chip-specific control driver.