Digital step attenuator RFIC for receiver gain and level control
Receiver level control · monolithic attenuators · programmed states
A digital step attenuator RFIC switches a monolithic attenuation network between programmed states in an RF signal chain. Select the frequency band, attenuation coding and startup state together with the RF-port conditions and the receiver control interface.
Monolithic RF digital step attenuator chips placed in receiver signal chains for digitally programmed level control, including attenuation-state coding, startup state and multi-device serial control. RF integrated circuits, product 4255, covers the broader chip family; RF output attenuator, product 9013, covers output-level setting in test and signal-generation setups. Variable gain amplifier, product 6887, covers amplifying gain-control ICs rather than an attenuator alone.
CNFX editorial research · Sources checked October 16, 2026 · 3 sources
A small programmed step does not promise monotonicity across the full RF band
pSemi PE43711 covers 9 kHz–6 GHz with a 31.75 dB attenuation range. Its monotonicity statements differ by band: 0.25 dB through 4 GHz, 0.5 dB through 5 GHz and 1 dB through 6 GHz. Preserve those frequency conditions when specifying receiver level steps. [1]
MACOM MAAD-000523 is a GaAs MMIC attenuator with 0.5 dB steps to 31.5 dB. The sheet title gives 0.7–6.0 GHz, while its feature list describes use from 0.4–8.0 GHz. Keep the stated range and the wider usable range distinct, and request the required-band performance rather than treating the wider statement as an identical specification. [3]
02
The mode pins determine the startup attenuation before software writes a state
PE43712 supports serial-addressable and parallel interfaces. Its serial command contains an attenuation word and an address word; the address is compared with the address-input configuration before the state changes. The datasheet requires the parallel control inputs to be grounded during serial-addressable operation. [2]
In serial-addressable and latched-parallel modes, PE43712 starts at 31.75 dB until the next word is latched. Direct-parallel mode applies the pre-set pin state after a 400 µs power-up delay, during which attenuation is at maximum. If those control pins float during direct-parallel startup, the sheet says the device defaults to the insertion-loss state. Include these mode-specific conditions in the control schematic and startup test. [2]
03
DC blocking is a part-specific RF-port requirement
The PE43711 sheet says external blocking capacitors are unnecessary if its RF ports have 0 V DC. MACOM’s MAAD-000523 pin-configuration footnote requires blocking capacitors on all RF ports. These are different device requirements; apply the selected part’s RF interface rather than copying the other device’s coupling arrangement. [1][3]
For PE43711, recommended CW input power above 48 MHz through 6 GHz is limited to +23 dBm with a 50 Ω reference and continuous duty. Lower-frequency operation uses a separate limit curve. Its compression-point figure of merit is not a substitute for the recommended RF-input-power limits. [1]
04
Send the receiver band and the attenuation-control sequence
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 16 October 2026
Buyer questions
Does the smallest step remain monotonic over the whole device band?
PE43711 assigns different monotonic step sizes to different frequency limits. Select the statement covering the receiver’s actual band. [1]
Can RF coupling components be copied between the two examples?
PE43711 makes its no-blocking-capacitor statement conditional on zero DC at the RF ports. MAAD-000523 explicitly requires RF-port blocking capacitors. [1][3]
Sources and what still needs a direct check
Sources checked 2026-10-16. The pSemi documents separate RF step behaviour from addressed programming and startup. The MACOM MMIC sheet gives a different range and RF coupling requirement.
