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 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
Buttons / LEDs
Buttons / LEDs
STLC2416C2
STLC2416C2
Class2 module
Line out L/R
1
1.5
p
Vp
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
Certification 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
Vol-
Vol+
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
Proprietary 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
V
CCin
I
ddw
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
BlueSoleil™, full-scale
streaming 1-kHz sine wave,
CODEC in binary mode
-
Bluetooth
®
technology linked
-
-
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.
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.
Conditions
Min
4.5
-
Typ
5.0
72
Max
16
80
Unit
V
mA
I
ddn
Supply current (working
mode, no streaming)
Supply current
(standby mode)
-
57
65
mA
I
dds
-
44
50
mA
V
lineout
Signal voltage on line out
1.4
1.5
1.6
Vpp
R
out
P
RFout
Z
out
VSWR
Line-out impedance (L, R)
RF output power
RF output impedance(J2)
Return loss
1
-6
-
-
3.6
<4
50
-
10
4
-
2.8
Ω
dBm
Ω
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
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