Project Startup Help

flux

Created the two requested Phase 2 control documents and made no schematic/layout changes.
Files:
Open items:
  • The ERS now supersedes earlier informal briefs where conflicts exist.
  • PCB placement/routing should wait until the Phase 2 engineering reviews are complete.
Suggested next steps:
  1. Produce the Engineering Review Report.
  2. Build the component comparison matrix.
  3. Create the power-state diagram and updated runtime estimates.
  4. Generate the prioritized schematic change list.
timbochu

timbochu

how do i save those specs/plans files to my device?

flux

Open each file in Flux, then use your browser’s normal save/download flow:
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RF Module Selection and Architecture Notes — Munkrofon
Current Decision Status
Updated: 2026-07-26
The RF-module selection has been re-opened per user instruction: DA14AVDDECT and RTX1090 are not mandatory, and the design must be based only on modules with reviewable public documentation.
Engineering conclusion:
  • Best professional ultra-low-latency DECT audio candidate: RTX A/S RTX1090 / RTX1090R1 MLM DECT Module with RTX Sheerlink / Sheersound.
  • Best public-datasheet integration candidate: Renesas DA14AVDDECT-SF01 Audio Voice Data Module.
  • Hard blocker for PCB layout: I did not find a fully public, official reference-design package — schematic, PCB layout/Gerbers, stackup, BOM, and antenna/reference layout files — for either RTX1090/RTX1090R1 Sheerlink or DA14AVDDECTDEVKT. Therefore I should not claim a production-ready schematic/PCB layout based on the selected RF module yet.
Recommendation
For the stated product goal — professional, ultra-low-latency, non-Bluetooth wireless microphone audio — the best 2026 RF/audio-module direction is:
RTX A/S RTX1090 or RTX1090R1 MLM DECT Module using RTX Sheerlink / Sheersound, with external low-latency audio codec/front-end and external professional balanced line-output circuitry.
This is the strongest fit because RTX explicitly positions the RTX1090/Sheerlink platform for wireless microphones, instruments, live-event/studio audio, and stage equipment, and RTX/RMED public materials cite analog-to-analog latency in the roughly 2–7 ms class depending on configuration. That is substantially stronger pro-audio latency evidence than I found for DA14AVDDECT.
However, this recommendation is conditional: the full RTX integration package appears vendor-gated rather than completely public. If we strictly require public, reviewable reference-layout files before continuing, the project is blocked until RTX/RMED provides them or until we accept a lower-confidence public-datasheet prototype around DA14AVDDECT.
Candidate Comparison

Table

CandidateExact manufacturer / partPublic evidence foundStrengthsWeaknesses / blockerDecision
RTX1090 / RTX1090R1 + SheerlinkRTX A/S RTX1090 / RTX1090R1 MLM DECT Module, with RTX Sheerlink / Sheersound audio solutionRTX product page/product sheet; Sheerlink public pages/product sheet; RMED Sheerlink reference-design page; public RTX1090 datasheet mirrors / DigiKey PDF; FCC antenna exhibitBest pro-audio positioning; compact 15.4 × 21.6 mm; DECT 1.9 GHz; public materials cite <2 ms, ~2.5 ms, under 3 ms, or <7 ms depending configuration; designed for high-end microphones/stage equipmentFull schematic/layout/reference-design package not publicly found; likely requires RTX/RMED customer engagement; external codec/audio hardware requiredBest technical/pro-audio candidate, but documentation-gated
DA14AVDDECT-SF01Renesas Electronics DA14AVDDECT-SF01 Audio Voice Data ModuleOfficial Renesas product page; official Renesas DA14AVDDECT-SF01 datasheet; DA14AVDDECTDEVKT quick-start guideActive module; official public datasheet; integrated DECT radio, DA14495, DA7218 codec, flash, battery-management features, integrated printed antenna; public pinout, BGA geometry, antenna keepout, layout guidelinesNo public numeric end-to-end latency found; current public datasheet notes current software implementations support mono audio; full EVK schematic/Gerber/layout files not found publicly; 17 × 26.65 mm module complicates 25 mm-wide PCBBest public-datasheet integration fallback; not proven best latency
SC14WAMDECTRenesas/Dialog SC14WAMDECT SF Wireless Audio ModuleOfficial Renesas product page and datasheetPublic datasheet includes microphone/tour-guide use, latency table, RF/audio/PCB guidelines; known 14.2 ms PA-mode latencyNot Recommended for New Designs; older 12 kHz-class audio; 14.2–18.3 ms is not ultra-low-latency by current pro-audio expectationsReject for new 2026 professional design
DECT NR+ platformsNordic/Renesas/industry DECT NR+ silicon/platforms, not a turnkey wireless-mic moduleDECT Forum / ETSI material; industry articlesFuture-looking professional-audio direction; deterministic low-latency promiseNo obvious public, production-ready wireless microphone module/reference layout foundMonitor; not selected now
RTX1290 / 2.4 GHz proprietaryRTX1290 with Sheerlink in 2.4 GHz variantRTX/RMED public materialSimilar low-latency Sheerlink audio path; footprint-compatible conceptNot DECT; 2.4 GHz band is crowded and violates the preferred DECT requirementBackup only if DECT is relaxed
Why RTX1090 / RTX1090R1 Wins Technically
Public RTX/RMED materials connect the RTX1090/Sheerlink platform directly to professional wireless-microphone and stage-equipment use. Reported public latency claims vary by source/configuration, but are consistently in the low single-digit to sub-7 ms class:
  • RTX Sheerlink public page: extreme low latency less than 2 ms, depending on configuration.
  • RMED Sheerlink wireless microphone reference-design page: under 3 ms analog-in to analog-out, 48 kHz / 24-bit audio, 10 Hz–22 kHz frequency response.
  • RTX RTX1090 product-sheet summaries: Sheersound codec latency around 20 µs, complete-system latency less than 7 ms.
That makes RTX1090/Sheerlink the strongest fit for the phrase professional ultra-low-latency DECT audio link.
Why DA14AVDDECT Is Not Automatically Best
DA14AVDDECT-SF01 is much easier to document from public official Renesas material than RTX1090. It has a public datasheet with pinout, BGA dimensions, layout guidelines, antenna keepout, analog microphone pins, headphone outputs, PCM/USB, battery/charger pins, and an integrated DA7218 codec.
But for this project, the decisive missing proof is latency. I found Renesas marketing language for low-latency microphone applications, but I did not find a public numeric end-to-end audio-latency guarantee for the current audio stack. The datasheet also indicates that current software implementations support mono audio despite stereo-capable hardware.
Therefore DA14AVDDECT is a reasonable prototype fallback only if we accept that latency must be validated experimentally or confirmed by Renesas before freezing the product.
Documentation Required Before Continuing With RTX1090 / RTX1090R1
If we choose the best technical candidate, request this exact package from RTX A/S or RMED before schematic/PCB layout:
  1. Current official datasheet for RTX1090 or RTX1090R1, not only mirrored copies.
  2. Exact ordering variant and lifecycle/commercial availability confirmation.
  3. Recommended land pattern and CAD footprint for the 88-pad LGA module.
  4. Hardware integration guide including all required supplies, boot/config pins, programming/debug, and production-test signals.
  5. Sheerlink / Sheersound reference schematic for transmitter and receiver.
  6. EVK carrier-board schematic, PCB layout/Gerbers, stackup, and BOM.
  7. Antenna/reference RF layout package, including integrated/inverted-F or external antenna options, matching network, diversity requirements, keepouts, stackup, and modular-approval conditions.
  8. Audio interface guide: I2S/PCM/TDM/PDM support, codec recommendations, master/slave clocking, sample rate, bit depth, MCLK/BCLK/LRCLK requirements, jitter tolerance, and muting/AGC/limiter behavior.
  9. Latency document: one-way and analog-to-analog latency, typical/worst-case values, test configuration, codec, sample rate, buffering, RF mode, channel count, and interference behavior.
  10. Firmware/SDK/license package for Sheerlink/Sheersound, including production programming and pairing/provisioning.
  11. Regulatory package: FCC/IC/CE/UKCA/MIC modular-approval status, labels, test modes, and integration conditions.
Documentation Required Before Continuing With DA14AVDDECT-SF01
If we choose the more public-documented fallback, request from Renesas:
  1. Current official DA14AVDDECT-SF01 datasheet and lifecycle/distributor status.
  2. DA14AVDDECTDEVKT schematic, PCB layout/Gerbers, stackup, and BOM; the public page appears to expose the quick-start guide but not full design files.
  3. Written end-to-end wireless microphone latency spec for the relevant audio stack and configuration.
  4. Audio-stack documentation for microphone transmitter and receiver operation, including mono/stereo limitations.
  5. Confirmation that the integrated charger/battery path should be used, or guidance for safely using an external charger/power path.
  6. Antenna integration and modular-approval guide, including exact keepout and whether an external diversity antenna is recommended.
Public Citations / Review Links
RTX / Sheerlink
Renesas DA14AVDDECT
Renesas SC14WAMDECT
Build Implication
I should not proceed to a production RF schematic/PCB layout until one of these is true:
  1. RTX/RMED provides the official RTX1090/RTX1090R1 + Sheerlink design package listed above; or
  2. Renesas provides the DA14AVDDECTDEVKT schematic/layout files plus written latency confirmation; or
  3. The project intentionally relaxes the “official reference layout” requirement and proceeds with a clearly marked exploratory prototype using only public datasheet/layout-guideline data.
Until then, it is safe to continue architecture, power budgeting, audio front-end selection, and connector/support-circuit planning, but not safe to freeze RF-module footprint, antenna layout, or production PCB routing.

  • Current Decision Status

  • Recommendation

  • Candidate Comparison

  • Why RTX1090 / RTX1090R1 Wins Technically

  • Why DA14AVDDECT Is Not Automatically Best

  • Documentation Required Before Continuing With RTX1090 / RTX1090R1

  • Documentation Required Before Continuing With DA14AVDDECT-SF01

  • Public Citations / Review Links

  • RTX / Sheerlink

  • Renesas DA14AVDDECT

  • Renesas SC14WAMDECT

  • Build Implication

Munkrofon

Munkrofon thumbnail
wireless

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$25.19–$34.44

Digi-Key

$16.75

HQonline

$8.65–$8.85

LCSC

$43.78–$44.14

Mouser

$50.90

TME

$17.30

Verical

$23.68–$45.06

Controls