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 evaluation 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 broad compatibility (Table 6) and a full set of certifications (Table 4, Table 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 with 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 FFXTM 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
Buttons / LEDs Buttons / LEDs
STLC2416C2 Class2 module Class2 module
Line out L/R Line out L/R 11.pp V 5 Vpp
LPF+BUFFER AD4811-2
PWM
CODEC STA529
SSI
3V3 LDO
3V3 LDO +5VDC
September 2007
Rev 1
1/28
www.st.com
Contents
AN2612
Contents
1 2 Picture and port description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Board configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Design information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 3.2 3.3 3.4 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Gerber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Design information for power management . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.1 3.4.2 Recommendations for the codec layout . . . . . . . . . . . . . . . . . . . . . . . . . 14 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5 3.6
Ground planes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4
Audio performance testing of the board . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 4.2 4.3 Test set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 FFT results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Test result with STM529AD (STM analog dongle) . . . . . . . . . . . . . . . . . . 21
5
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 5.2 5.3 Overview of BT-STA2416C2 module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Cer tification of Bluetooth module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Interoperability list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6 7
Trademark and other acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 26 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2/28
AN2612
Picture and port description
1
Picture and port description
Figure 2. Ports available on the board
Antenna Line out
VolVol+ Play/pause Standby Connected 5 V DC supply Proprietary connector
Reset
Table 1.
Port name J5 J1 J3 J4 J2 S1 S2
Port description
Description 5-V DC power supply Proprietar y connector Audio line out, right channel Audio line out, left channel External antenna connector Reset button Reserved Port name S3 S4 S5 D1 D3 D4 D5 Description Volume Volume + Play / Pause BT link indicator Reserved Standby Reserved
3/28
Board configurations
AN2612
2
Board configurations
Figure 3. Configuration 1
Emb edded s yste m 1 :
Hom e AV system
B l u e t o o th a n al o g d ongl e (S T s ol uti on: AD529) AV s ys t e m L i n e in player
OR
J2 power supply= +5VDC
BT_HTS_RX_R2
J5
J3 J4 Line out
Audio Amplifier
Figure 4.
Configuration 2
Embedded system 2: Bl ue toot h a na l o g dongle (ST solution: AD 5 2 9 ) AV s ys t e m p l a ye r
OR
H o m e A V s ys t e m
J2 +5VDC BT_HTS_RX_R2 J5 J3 J4 Line out A udi o S RC S w it c h e r
Audio Amplifier
4/28
AN2612
Board configurations
2.1
Electrical specifications
(VCCin = 5.0 V and ambient temperature = 25 C unless otherwise specified) Table 2.
Symbol VCCin Iddw
Electrical characteristics
Parameter Board power supply Supply current (working mode) Bluetooth technology streaming mode, CODEC in binary mode Bluetooth technology module connected, no data streaming, CODEC in binary mode Bluetooth technology module not connected. Bluetooth technology streaming mode, IVT BlueSoleilTM, full-scale streaming 1-kHz sine wave, CODEC in binary mode Bluetooth Test with Bluetooth technology USB dongle, IVT BlueSoleilTM Version 1.4.8.1, 1-kHz sine wave full scale input, 1-Vpp line out, 20-20 kHz. Test with Bluetooth technology USB dongle, IVT BlueSoleilTM version 1.4.8.1, 1-kHz sine wave full scale input, 1-Vpp line out, 20-20 kHz.
Conditions
Mi n 4.5 -
Typ 5.0 72
Max 16 80
Unit V mA
Iddn
Supply current (working mode, no streaming) Supply current (standby mode)
-
57
65
mA
Idds
-
44
50
mA
Vlineout
Signal voltage on line out
1.4
1.5
1.6
Vpp
Rout PRFout Zout VSWR
Line-out impedance (L, R) RF output power RF output impedance(J2) Return loss
1 technology linked -6 -
3.6 <4 50 -
10 4 2.8
dBm dB
THD+N
Total harmonic distortion+noise (L, R)
-
0.089 0.1
%
SNR
Signal to noise ratio (L, R) (no weighting)
72
-
-
dB
5/28
Design information
AN2612
3
3.1
Design information
Schematics
Figure 5. Receiver stage
6/28
AN2612 Figure 6. Codec and PWM stage
Design information
7/28
Design information Figure 7. Filter and output stage
AN2612
8/28
AN2612
Design information
3.2
Bill of materials
Table 3.
Item 1 Ref CAP
BOM for BT_HTS_RX_R2 (V01)
Qty 2 Designator C1, C16 Part 10 F, 16 V Footprint CE45 Remarks Aluminium capacitor 4.5mm
2 3 4 5 6 7 8 9 10
CAP CAP CAP CAP CAP CAP CAP CAP CAP
16 1 2 1 4 1 2 2 1
C2, C3, C4, C5, C8, C10, C13, C14, C18, C19, C20, 100 nF C24, C26, C29, C32, C48 C6 C7, C9 C11 C12, C15, C17, C22 C21 C23, C25 C31, C47 C27 82 pF 22 pF 220 pF 10 nF 220 F 16 V 1 F 1 F 220 F, 16 V
0603 0603 0603 0603 0603 CE66 0805 0603 CE83 Aluminium capacitor 8.3mm Aluminium capacitor 6.6mm Aluminium capacitor 6.6mm
11 12 13 14 15
CAP CAP CAP CAP CAP
1 1 1 2 6
C28 C33 C34 C35, C44
3.3 F, 6.3 V 0.1 F 100 F, 16 V 2.2 nF
CE66 0603 CE66 0603 0603
Aluminium capacitor 6.6mm
C36, C37, C38, C41, C45, 150 pF C46 C39, C42 C40, C43 C49 47 F, 16 V 100 pF 3.3 F, 6.3 V Blue, high efficiency 1SS335 Green, high efficiency
16 17 18
CAP CAP CAP
2 2 1
CE66 0603 CE45
Aluminium capacitor 6.6mm
Aluminium capacitor 4.5mm
19 20 21
LED
1
D1 D2 D3, D4, D5
0805 0805 0805
DIODE 1 LED 3
9/28
Design information Table 3.
Item 22 23 24 25 26 27 28 29 30 31 32 33 34 Ref
AN2612 BOM for BT_HTS_RX_R2 (V01) (continued)
Qty Designator TMBYV10-60 IC1 IC2 IC3 IC4 IC5, IC6 J1 J2 J3 J4 J5 L1, L2 R1, R2, R20, R21, R52, R53 Part Diode BT-STA2416C2 STA529QFN LD2985AM18 TS462 LD2985AM33 CON8A CON5 RIGHT LEFT CON2 FERRITE 1 k QFN52 SOT23-5L MSOP8 SOT23-5L 2 x 4-pin step 2.54mm SMA RCA RCA DC jack 0805 0603 Alternative: ADA4841-2 Footprint Remarks Can take replacement
DIODE 1 IC IC IC IC IC CON CON CON CON CON BEAB RES 1 1 1 1 2 1 1 1 1 1 2 6
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
RES RES RES RES RES RES RES RES RES RES RES RES SW TP TP TP
15 3 1 1 1 1 1 2 4 12 2 2 5 1 1 1
R3, R7, R9, R10, R12, R13, R14, R15, R16, R17, 0 R18, R19, R24, R28, R51 R4, R39, R44 R6 R8 R22 R23 R25 R26, R27 R29, R33, R49, R50 10 k 100 3.3 k 1 M 12 k 470 1.1 30 k
0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 KSR221J 1 pin not soldered 1 pin not soldered 1 pin not soldered Can take replacement
R30, R31, R32, R35, R36, R37, R40, R41, R42, R46, 4.7 k R47, R48 R34, R45 R38, R43 S1, S2, S3, S4, S5 TP1 TP2 TP3 1.5 k 15 k KSR221J RST PWREN BOOT
10/28
AN2612 Table 3.
Item 51 52 53 54 55 56 57 58 59 Ref TP TP TP TP1 TP TP TP TP
Design information BOM for BT_HTS_RX_R2 (V01) (continued)
Qty 1 1 1 1 1 1 1 1 TP4 TP5 TP6 TP7 TP8 TP11 TP13 TP14 Y1 Designator Part USB VCC 3.3V UART_TXD GND UART_RXD AUDIO_L AUDIO_R BT_RESET 13 MHz Footprint 1 pin not soldered 1 pin not soldered 1 pin not soldered 1 pin not soldered 1 pin not soldered 1 pin not soldered 1 pin not soldered 1 pin not soldered 49SX Remarks
Cr ystal 1
11/28
Design information
AN2612
3.3
Gerber
Figure 8. Silkscreen - top
Figure 9.
Silkscreen - bottom (viewed from top of board)
12/28
AN2612 Figure 10. Copper layer - top
Design information
Figure 11. Copper layer - bottom (viewed from top of board)
13/28
Design information
AN2612
3.4
3.4.1
Design information for power management
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 could 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
14/28
AN2612
Design information Figure 13. Line output noise with Bluetooth module active, no streaming
Common Bluetooth / audio power supply
BT_HTS_RX_R2 two-regulator supply
15/28
Design information
AN2612
3.5
Ground planes
As usual, good grounding is very important for 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
16/28
AN2612
"
Design information 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)
17/28
Design information Figure 17. Ground arrangement on layout (top view)
AN2612
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 oscillator 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.
"
18/28
AN2612
Audio performance testing of the board
4
4.1
Audio performance testing of the board
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
External power supply (5 V DC)
B
J5
J2
J3 J4 VT Bluesoleil 1.4.8.1 W indows
T_HTS_RX_R2
Audio
precision
Bluetooth USB dongle Analog Input Channel A Analog Input Channel B I
19/28
Audio performance testing of the board
AN2612
4.2
FFT results
Figure 19. FFT 0-dBFS input, 3.3 V, 600
+0 -10 -20 -30 -40 -50 -60 d B V -70 -80 -90 -100 -110 -120 -130 -140 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
Figure 20. FFT noise floor, 3.3 V, 600
+0 -1 0 -2 0 -3 0 -4 0 -5 0 -6 0 d B V -7 0 -8 0 -9 0 -1 0 0 -1 1 0 -1 2 0 -1 3 0 -140 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
20/28
AN2612
Audio performance testing of the board
4.3
Test result with STM529AD (STM analog dongle)
Figure 21. FFT 2.36-V, 1-kHz input from STM529AD, 1-Vpp line out
+0 -10 -20 -30 -40 -50 d B V -60 -70 -80 -90 -100 -110 -120 -130 -140 20 50 100 200 500 Hz
In p u t s i g n a l Vrm s =2 .3 6 v (m a x) L i n e out Vpp=1v S N R =7 3 d B(A weighting),(600ohm s )
1k
2k
5k
10k
20k
Minimum SNR = 73 dB (A weighting) Caution: The maximum input level for STM529AD is 2.36 V RMS.
21/28
Audio performance testing of the board Figure 22. THD + N vs frequency (2.36-V RMS input, 1-Vpp line out)
AN2612
Figure 23. Frequency response (0dBr = 1 Vpp, 2.36-V RMS input, 1-Vpp line out)
22/28
AN2612
Appendix
5
5.1
Appendix
Overview of BT-STA2416C2 module
Figure 24. BT-STA2426C2 module BT-STA2416C2
RF Frontend STLC2150 Host ctrl. STA2416
15 mm
RF link
30 mm
The BT-STA2416C2 module is based on two ICs:
"
STA2416 host controller STLC2150 RF
Information for the STMicroelectronics ICs. Suppor ted 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 Suppor t 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
23/28
Appendix
AN2612
5.2
Certification of Bluetooth module
The STMicroelectronics chipset and modules given in Table 4 are fully compliant with the following BQB certifications under PRD2.0 standard: Table 4.
Qualified designs
BQB qualified designs (chipset and modules)
Manufacturer Product ID Product type Profiles QD ID
Bluetooth ST technology BT_STA2416C2 Component RF, BB, LM, HCI Microelectronics module
B012535
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 5.
Qualified designs
Supported profiles
Manufacturer Product ID Product type Profiles QD ID
Bluetooth Open Interface technology North America, stack Inc.
BLUEmagic 3.0
SDP, GAP, A2DP, AVCTP, AVDTP, AVRCP, BIP, BNEP, BPP, CTP, DUN, Profile FAX, FTP, GAVDP, HCRP, B010293 sub-system HFP, HID, HP, ICP, OPP, PAN, RFCOMM, SAP, SDAP, SPP, SYNC, L2CAP
24/28
AN2612
Appendix
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. Table 6. Interoperability list (April 2007)
Type PDA PDA Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone MP3 Player Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone IPAQ GSM type (EU) U890 Chocolate VX8500 (USA)krzr k1 V3X 8801 (China) E788 (EU) D820 (Korea) SCH-B380 (Korea)SCH-B5050 (Korea)SCH-B560 (Korea)SCH-B630 (Korea)SCH-V740 (Korea)SGH-D600 (Korea)SPH-V9600 (Korea)SPH-V9850 YP-T9B W850i (China)P990i (EU)W810i (USA)K800i (USA)W710i (USA)W850i Model
Manufacturer Blackjack HP LG LG LG Motorola Motorola Nokia Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson
Tests will follow and the firmware of the receiver demo board will be revised, if necessary, in order to suit new commercial products. The present FW release is marked STM849_SINK_V10_E1.0.3, and updates will be available on newer demo boards as soon as they are released.
25/28
Trademark and other acknowledgements
AN2612
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.
26/28
AN2612
Revision history
7
Revision history
Table 7.
Date Sep-2007
Document revision history
Revision 1 Initial release. Changes
27/28
AN2612
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 herein 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 assumes 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. If 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 whatsoever 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 PARTICULAR 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 MILITARY, 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 whatsoever, 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 - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
28/28
|
