CSR8645 Bluetooth 4.0 – APT-X MP3 AAC FastStream – Breakout Board
Table of Contents
Die Erfahrung hat gezeigt, dass ein Großteil/Alle günstig am Markt erhältlichen Bluetooth-Module Probleme verschiedenster Art haben. Sei es nun, dass sie Störungen generieren, Störgeräusche empfangen, eine schlechte Reichweite haben und/oder klanglich unterirdisch sind.
Dieses Modul auf Basis des CSR8645 bietet
Spezifikation
- Eingangsspannungsbereich 5.5-40V (TPS7A6601), 5.0V (USB)
- alternativ 6.0-60V (TPS54061) mit Flybuck und isolierter Versorgung des Linedrivers
- störungsfreier Betrieb
- DSP/EQ (Kalimba DSP)
- 2Vrms Ausgangspegel unsymmetrisch über 3.5mm Klinkenbuchse oder 1×3 Pinheader per DRV602 Linedriver
- Symmetrischer Ausgang am DAC
- unsymmetrischer Eingang (AUX Line) via 3.5mm Klinkenbuchse
- AAC, MP3, APT-X, FastStream
- USB-Audio (optional)
- Programmierung über USB, ohne Programmer
- 5 Taster (optional); auch verfügbar auf 1×7 Buchsenleiste
- 3 LED (optional)
- 10 GPIO an 1×12 Buchsenleiste
- 1V8 <-> 3V3 Levelshift für SPI/Programmer
- u.FL Antennenanschluss
- und, bei Verwendung einer externen Antenne, ca. 40m Reichweite
Hardware
CSR8645 Breakout Board Hardware #1
CSR8645 Breakout Board Hardware #1
Messungen
Loopback EMU-0202 (Referenz)
Loopback Spectrum 1kHz 96kHz 3dBV EMU-0202
Loopback Modulation+Distortion 96kHz -6dBFS EMU-0202
Loopback Distortion THD 96kHz -6dBFS EMU-0202
Statisches Rauschen
Spectrum 96kHz EMU-0202 – Static Noise
1kHz Spektrum via BT-Link
Spectrum 1kHz 96kHz -6dBV BT-Link
Spectrum 1kHz 96kHz -3dBV BT-Link
Spectrum 1kHz 96kHz 6dBV BT-Link
1kHz Spektrum via AUX Line-In
Spectrum 1kHz 96kHz -3dBV AUX Line-In
Spectrum 1kHz 96kHz 3dBV AUX Line-In
Modulation + Distortion – Aux Line-In
Modulation+Distortion 96kHz -3dBV AUX Line-In
Distortion THD 96kHz -3dBV AUX Line-In
Is the flybuck converter selected to drive this board if I for example; use this in a boombox and have noise/groundloop issues? Or is the PSRR of the TPS7A6601 enough for this application?
Correct, thats what it is for. The main problem is ground loop related when looking at a fully build amp. These BT-ICs conduct some noise when grounding/layout/wiring is bad. For this there are two solutions implemented on this board. 1st the flybuck, 2nd the DRV602 Linedriver with ground-loop-breaker. See TI AN SLOA143.
GroundLoopBreakCircuitsandTheirOperation
Until now i haven’t needed the flybuck, it always worked with the DRV602 alone. Seems like the layout isn’t that bad. 🙂
Regards, Christian
Das sieht ja fantastisch aus und ist eigentlich das einzige, was dem Chip angemessen ist. Gibt es das Board irgendwo zu kaufen? Oder die Schematics + BOM?
Unbestückte Boards sind noch verfügbar.
I’d like the final schematic + BOM if available? Or could it be purchased?
If you have a board, then I gladly buy it. I can even buy two boards if available.
Best,
Alexander
Hi nice work.
Im currently working on a hobby project for the F3188.
Its a hard time to find documentation about this.
Is there any chance you could share the schematics or some documentation of the F3188?
Please head over to http://www.stromrichter.org
Hi, I picked this thread on diyaudio.com forum, and I would like to ask if this board will be up for sale? I would pretty much prefer this over questionable breakouts from alixpress…
I have some bare (unpopulated) boards available, you’ll need to solder them on your own. Regards, Christian
Did you actually try to program the this one?
How would you go about programming it?
You’ll need an SPI-USB programmer to do so, they’re available on i.e. Aliepxress (3rd party). Programming is done by the tools provided from CSR.
Was the APTX enabled by default or module needs to be reflashed by programmer?
Regards.
Yes, it works out of the box.