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september 2007 rev 1 1/28 AN2612 applications note how to use the bt_hts_rx_r2 evaluation board features ! support a2dp/avrcp (sink side) profile. ! class 2 (max +4 dbm rf power output), bqb qualified module. ! single 5-v dc power supply. ! 1.5-vpp line-out (stereo) with full scale input. hardware/software version ! hardware version: r2a. ! software version: e1.0.3. overview the demo-board bt_hts_rx_ r2 facilitates the evalua tion of the bt-sta2416c2 bluetooth ? technology wireless module in an a2dp environment. it is based on the soundabout ? and bluemagic ? software of open interface north america, inc and it guarantees a bro ad compatibility ( ta bl e 6 ) and a full set of certifications ( ta bl e 4 , ta bl e 5 ). figure 1. shows a block diagram of the bt_hts_rx_r2 board. the bluetooth ? technology stream received by the rf antenna is sent to the bt-sta2416c2. this highly-integrated module is able to communicate wirelessly wit h bta2dp sources such as cellular phones, bt dongles and notebook pcs. audio data is then fed into the sta529. this device provides the codec and a high-efficiency class-d output stage based on ffx? technology. the pwm output signal is then reconverted to an analog audio signal by a ts462 (or an ada4841-2) op-amp configured to filter the pwm and supply a standard 1.5-vpp line output. figure 1. block diagram s s t t l l c c 2 2 4 4 1 1 6 6 c c 2 2 c c l l a a s s s s 2 2 m m o o d d u u l l e e c c o o d d e e c c s s t t a a 5 5 2 2 9 9 l l p p f f + + b b u u f f f f e e r r a a d d 4 4 8 8 1 1 1 1 - - 2 2 l l i i n n e e o o u u t t l l / / r r 1 1 v v p p p p 3 3 v v 3 3 l l d d o o + + 5 5 v v d d c c 3 3 v v 3 3 l l d d o o s s s s i i p p w w m m b b u u t t t t o o n n s s / / l l e e d d s s 1.5 vpp www.st.com
contents AN2612 2/28 contents 1 picture and port description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 board configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 design information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 gerber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.4 design information for power management . . . . . . . . . . . . . . . . . . . . . . . 14 3.4.1 recommendations for the codec layout . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.4.2 power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.5 ground planes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.6 emi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4 audio performance testing of t he board . . . . . . . . . . . . . . . . . . . . . . . . 19 4.1 test set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.2 fft results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3 test result with stm529ad (stm analog dongle) . . . . . . . . . . . . . . . . . . 21 5 appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.1 overview of bt-sta2416c2 module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.2 certification of bluetooth? module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.3 interoperability list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6 trademark and other acknowledg ements . . . . . . . . . . . . . . . . . . . . . . . 26 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
AN2612 picture and port description 3/28 1 picture and port description figure 2. ports available on the board table 1. port description port name description port name description j5 5-v dc power supply s3 volume - j1 proprietary connector s4 volume + j3 audio line out, right channel s5 play / pause j4 audio line out, left channel d1 bt link indicator j2 external antenna connector d3 reserved s1 reset button d4 standby s2 reserved d5 reserved antenna line out vol- vol+ play/pause standby connected reset proprietary connector 5 v dc supply
board configurations AN2612 4/28 2 board configurations figure 3. configuration 1 figure 4. configuration 2 h h o o m m e e a a v v s s y y s s t t e e m m a a v v p p l l a a y y e e r r s s y y s s t t e e m m l l i i n n e e i i n n audio amplifier bt_hts_rx_r2 line out j3 j4 j2 j5 power supply= +5vdc b b l l u u e e t t o o o o t t h h a a n n a a l l o o g g d d o o n n g g l l e e ( ( s s t t s s o o l l u u t t i i o o n n : : a a d d 5 5 2 2 9 9 ) ) o o r r e e m m b b e e d d d d e e d d s s y y s s t t e e m m 1 1 : : h h o o m m e e a a v v s s y y s s t t e e m m a a v v p p l l a a y y e e r r s s y y s s t t e e m m audio amplifier bt_hts_rx_r2 line out j3 j4 j2 j5 +5vdc b b l l u u e e t t o o o o t t h h a a n n a a l l o o g g d d o o n n g g l l e e ( ( s s t t s s o o l l u u t t i i o o n n : : a a d d 5 5 2 2 9 9 ) ) o o r r e e m m b b e e d d d d e e d d s s y y s s t t e e m m 2 2 : : a a u u d d i i o o s s r r c c s s w w i i t t c c h h e e r r
AN2612 board configurations 5/28 2.1 electrical specifications (vccin = 5.0 v and ambient temperatur e = 25 c unless othe rwise specified) table 2. electrical characteristics symbol parameter conditions min typ max unit v ccin board power supply 4.5 5.0 16 v i ddw supply current (working mode) bluetooth ? technology streaming mode, codec in binary mode - 7280ma i ddn supply current (working mode, no streaming) bluetooth ? technology module connected, no data streaming, codec in binary mode - 5765ma i dds supply current (standby mode) bluetooth ? technology module not connected. - 4450ma v lineout signal voltage on line out bluetooth ? technology streaming mode, ivt bluesoleil?, full-scale streaming 1-khz sine wave, codec in binary mode 1.4 1.5 1.6 vpp r out line-out impedance (l, r) - 1 3.6 10 ? p rfout rf output power bluetooth ? technology linked -6 <4 4 dbm z out rf output impedance(j2) - - 50 - ? vswr return loss - - - 2.8 db thd+n total harmonic distortion+noise (l, r) test with bluetooth ? technology usb dongle, ivt bluesoleil? version 1.4.8.1, 1-khz sine wave full scale input, 1-vpp line out, 20-20 khz. -0.0890.1% snr signal to noise ratio (l, r) (no weighting) test with bluetooth ? technology usb dongle, ivt bluesoleil? version 1.4.8.1, 1-khz sine wave full scale input, 1-vpp line out, 20-20 khz. 72--db
design information AN2612 6/28 3 design information 3.1 schematics figure 5. receiver stage
AN2612 design information 7/28 figure 6. codec and pwm stage
design information AN2612 8/28 figure 7. filter and output stage
AN2612 design information 9/28 3.2 bill of materials table 3. bom for bt_hts_rx_r2 (v01) item ref qty designator part footprint remarks 1 cap 2 c1, c16 10 f, 16 v ce45 aluminium capacitor 4.5mm 2cap16 c2, c3, c4, c5, c8, c10, c13, c14, c18, c19, c20, c24, c26, c29, c32, c48 100 nf 0603 3 cap 1 c6 82 pf 0603 4 cap 2 c7, c9 22 pf 0603 5 cap 1 c11 220 pf 0603 6 cap 4 c12, c15, c17, c22 10 nf 0603 7 cap 1 c21 220 f 16 v ce66 aluminium capacitor 6.6mm 8 cap 2 c23, c25 1 f 0805 9 cap 2 c31, c47 1 f 0603 10 cap 1 c27 220 f, 16 v ce83 aluminium capacitor 8.3mm 11 cap 1 c28 3.3 f, 6.3 v ce66 aluminium capacitor 6.6mm 12 cap 1 c33 0.1 f 0603 13 cap 1 c34 100 f, 16 v ce66 aluminium capacitor 6.6mm 14 cap 2 c35, c44 2.2 nf 0603 15 cap 6 c36, c37, c38, c41, c45, c46 150 pf 0603 16 cap 2 c39, c42 47 f, 16 v ce66 aluminium capacitor 6.6mm 17 cap 2 c40, c43 100 pf 0603 18 cap 1 c49 3.3 f, 6.3 v ce45 aluminium capacitor 4.5mm 19 led 1 d1 blue, high efficiency 0805 20 diode 1 d2 1ss335 0805 21 led 3 d3, d4, d5 green, high efficiency 0805
design information AN2612 10/28 22 diode 1 tmbyv10-60 diode can take replacement 23 ic 1 ic1 bt-sta2416c2 24 ic 1 ic2 sta529qfn qfn52 25 ic 1 ic3 ld2985am18 sot23-5l 26 ic 1 ic4 ts462 msop8 alternative: ada4841-2 27 ic 2 ic5, ic6 ld2985am33 sot23-5l 28 con 1 j1 con8a 2 x 4-pin step 2.54mm 29 con 1 j2 con5 sma 30 con 1 j3 right rca 31 con 1 j4 left rca 32 con 1 j5 con2 dc jack 33 beab 2 l1, l2 ferrite 0805 34 res 6 r1, r2, r20, r21, r52, r53 1 k ? 0603 35 res 15 r3, r7, r9, r10, r12, r13, r14, r15, r16, r17, r18, r19, r24, r28, r51 0 ? 0603 36 res 3 r4, r39, r44 10 k ? 0603 37 res 1 r6 100 ? 0603 38 res 1 r8 3.3 k ? 0603 39 res 1 r22 1 m ? 0603 40 res 1 r23 12 k ? 0603 41 res 1 r25 470 ? 0603 42 res 2 r26, r27 1.1 ? 0603 43 res 4 r29, r33, r49, r50 30 k ? 0603 44 res 12 r30, r31, r32, r35, r36, r37, r40, r41, r42, r46, r47, r48 4.7 k ? 0603 45 res 2 r34, r45 1.5 k ? 0603 46 res 2 r38, r43 15 k ? 0603 47 sw 5 s1, s2, s3, s4, s5 ksr221j ksr221j can take replacement 48 tp 1 tp1 rst 1 pin not soldered 49 tp 1 tp2 pwren 1 pin not soldered 50 tp 1 tp3 boot 1 pin not soldered table 3. bom for bt_hts_rx_r2 (v01) (continued) item ref qty designator part footprint remarks
AN2612 design information 11/28 51 tp 1 tp4 usb vcc 1 pin not soldered 52 tp 1 tp5 3.3v 1 pin not soldered 53 tp 1 tp6 uart_txd 1 pin not soldered 54 tp1 1 tp7 gnd 1 pin not soldered 55 tp 1 tp8 uart_rxd 1 pin not soldered 56 tp 1 tp11 audio_l 1 pin not soldered 57 tp 1 tp13 audio_r 1 pin not soldered 58 tp 1 tp14 bt_reset 1 pin not soldered 59 crystal 1 y1 13 mhz 49sx table 3. bom for bt_hts_rx_r2 (v01) (continued) item ref qty designator part footprint remarks
design information AN2612 12/28 3.3 gerber figure 8. silkscreen - top figure 9. silkscreen - bottom (viewed from top of board)
AN2612 design information 13/28 figure 10. copper layer - top figure 11. copper layer - bottom (viewed from top of board)
design information AN2612 14/28 3.4 design information for power management 3.4.1 recommendations for the codec layout " use an electrolytic capacitor at each branch of the vcc power track. " place decoupling capacitors as close as possible to the vcc and ground pins. " dissipate the heat with a large ground plane. " place the pll filter components as close as possible to pin filt. " for differential applications create symmetrical paths for the output stage. please refer to the sta529 datasheet/applications note for details of the above points. 3.4.2 power supply considerations the bluetooth ? technology transmitter and receiver are alternately switching on and off and there is a risk that the switching noise will appear on the power supply lines. furthermore this switching frequency is in the audio band. so, if the supply is shared with the audio stage and insufficient decoupling is employed, it co uld lead to a noisy audio line output when used in single-ended mode, as shown in figure 13 , upper photo. in order to minimize this possibility it was decided to employ separate regulators on the bt_hts_rx_r2 board for the rf part and for the analog audio part. the lower photo of figure 13 shows the resulting line output for single-ended mode. figure 12 shows how the power management is implemented on the board. ic5, ic6 are two 3.3 v low dropout (ldo) regulators (st reference ld2985am33). 3v3_bt is the supply for bluetooth ? technology module, and 3v3_reg is that for the sta529q (codec). other brands of ldo are also usable, but they should have a high psrr and a good regulation rate. switching type dc/dc power supplies are also workable for the bluetooth ? module supply. figure 12. power management
AN2612 design information 15/28 figure 13. line output noise with bl uetooth module active, no streaming common bluetooth / audio power supply bt_hts_rx_r2 two-regulator supply
design information AN2612 16/28 3.5 ground planes as usual, good grounding is very important fo r audio products. since bt_hts_rx_r2 is a mixed analog and digital signal board, the ground connections were considered very carefully. " rf grounding below the bt-sta2416c2 module is separate from the other modules, and is connected to the main ground inside the bt-sta2416c2 module. figure 14 shows the antenna and rf grounding for improved rf reception. figure 14. antenna and rf grounding
AN2612 design information 17/28 " bluetooth ? technology digital ground, codec digital ground, codec analog ground, codec pa ground and op-amp analog ground are all separate, and each of them is connected to one main grounding point as shown below in figure 15 and figure 16 . figure 15. grounding arrangement on schematics figure 16. ground arrangement on layout (bottom view)
design information AN2612 18/28 figure 17. ground arrangement on layout (top view) 3.6 emi the emi was minimized by: " following the recommendations in section 3.5 on page 16 for the ground configuration. " placing the 13-mhz crystal as close as possible to the codec (sta529). the tracks between the crystal and the sta529 oscillato r pins were made as short as possible and the ic was well grounded. " making the tracks from out1a, out1b, out2a and out2b of the sta529 to the op-amp as short as possible. for more details on this point please refer to the datasheet and applications note for the sta529.
AN2612 audio performance testing of the board 19/28 4 audio performance testing of the board 4.1 test set-up testing is done with the bluetooth ? technology v1.2 class-2 usb dongle, running with ivt bluesoleil 1.4.8.1 software, streaming 1 khz sine-wave signal by windows media ? player 10 on the computer, and measuring with audio precision. the diagram for the set-up is shown below in figure 18 . figure 18. test set-up ivt bl u e s oleil 1.4. 8 .1 window s bl u etooth u s b dongle bt_ht s _rx_r2 j 3 j4 j2 j5 extern a l power su pply (5 v dc) a u dio preci s ion an a log inp u t ch a nnel a an a log inp u t ch a nnel b
audio performance testing of the board AN2612 20/28 4.2 fft results figure 19. fft 0-dbfs input, 3.3 v, 600 ? figure 20. fft noise floor, 3.3 v, 600 ? -140 +0 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz -140 +0 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz
AN2612 audio performance testing of the board 21/28 4.3 test result with stm5 29ad (stm analog dongle) figure 21. fft 2.36-v, 1-khz input from stm529ad, 1-vpp line out minimum snr = 73 db (a weighting) caution: the maximum input level fo r stm529ad is 2.36 v rms. input signal vrms=2.36v (max) line out vpp=1v snr=73db(a weighting),(600ohms) -140 +0 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz
audio performance testing of the board AN2612 22/28 figure 22. thd + n vs frequency (2.36-v rms input, 1-vpp line out) figure 23. frequency response (0dbr = 1 vpp, 2.36-v rms input, 1-vpp line out)
AN2612 appendix 23/28 5 appendix 5.1 overview of bt-sta2416c2 module figure 24. bt-sta2426c2 module the bt-sta2416c2 module is based on two ics: ? sta2416 host controller ? stlc2150 rf information for the stmicroelectronics ics. " supported interfaces: ? usb (1.1) ?uart ? pcm (pulse code modulation) " output power level: class 2 (max +4 dbm) " bluetooth ? technology protocol layer support up to hci " acl & sco links " transmission rate up to 721 kbit/s " optimized link manager and control " support wlan coexistence " integrated 4-mbit flash, 64-kbyte ram, 4-kbyte rom " single 3.3-v power supply " low power consumption " ce compliant " safety en60950-1 (2001) " emc en301 489 17v1.2.1 " radio es 300 328 v1.6 " bqb: rf - hci - lm - bb host ctrl. sta2416 rf front- end stlc2150 rf link 15 mm 30 mm bt-sta2416c2
appendix AN2612 24/28 5.2 certification of bluetooth ? module the stmicroelectronics chipset and modules given in ta bl e 4 are fully compliant with the following bqb certifications under prd2.0 standard: the stack supplied by open interface north america, inc. is bqb certified and provides full connectivity for our bluetooth ? technology wireless kit by supporting different profiles. table 4. bqb qualified designs (chipset and modules) qualified designs manufacturer product id product type profiles qd id bluetooth technology module st microelectronics bt_sta2416c2 component rf, bb, lm, hci b012535 table 5. supported profiles qualified designs manufacturer product id product type profiles qd id bluetooth technology stack open interface north america, inc. bluemagic ? 3.0 profile sub-system s d p, g a p, a 2 d p, a v c t p, a v d t p, a v r c p, b i p, bnep, bpp, ctp, dun, fax, ftp, gavdp, hcrp, hfp, hid, hp, icp, opp, pan, rfcomm, sap, sdap, spp, sync, l2cap b010293
AN2612 appendix 25/28 5.3 interoperability list the board can sink audio from a2dp compliant audio sources. the table below lists the commercial source products tested as of april 2007. some source products may require a firmware update in order to operate properly. tests will follow and the firmware of the receiver demo board will be revise d, if necessary, in order to suit new commercial products. the present fw release is marked stm849_sink_v10_e1.0.3, and u pdates will be available on ne wer demo boards as soon as they are released. table 6. interoperability list (april 2007) manufacturer type model blackjack pda hp pda ipaq lg mobile phone gsm type lg mobile phone (eu) u890 lg mobile phone chocolate vx8500 motorola mobile phone (usa)krzr k1 motorola mobile phone v3x nokia mobile phone 8801 samsung mobile phone (china) e788 samsung mobile phone (eu) d820 samsung mobile phone (korea) sch-b380 samsung mobile phone (korea)sch-b5050 samsung mobile phone (korea)sch-b560 samsung mobile phone (korea)sch-b630 samsung mobile phone (korea)sch-v740 samsung mobile phone (korea)sgh-d600 samsung mobile phone (korea)sph-v9600 samsung mobile phone (korea)sph-v9850 samsung mp3 player yp-t9b sony ericsson mobile phone w850i sony ericsson mobile phone (china)p990i sony ericsson mob ile phone (eu)w810i sony ericsson mobile phone (usa)k800i sony ericsson mob ile phone (usa)w710i sony ericsson mob ile phone (usa)w850i
trademark and other acknowledgements AN2612 26/28 6 trademark and other acknowledgements bluetooth is a registered trademark of bluetooth sig inc. soundabout and bluemagic are registered trademarks of open interface north america, inc. ffx is an stmicroelectronics proprietary digital modulation technology. bluesoleil is a trademark of ivt corporation. windows media is a registered trademark of microsoft corporation.
AN2612 revision history 27/28 7 revision history table 7. document revision history date revision changes sep-2007 1 initial release.
AN2612 28/28 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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