ST EVAL-7803APSO-SA User manual

Introduction
Scope of this document is to describe the EVAL-7803APSO-SA standalone demo module.
It contains the module description, the schematic, the bill of materials and the board layout of the following modules:
6038-469.18 v1.0
In the following chapters it will be referred as 469 module.
Evaluation board for TDA7803A and TDA7808 power amplifiers in PSO package
UM2758
User manual
UM2758 - Rev 1 - August 2020
For further information contact your local STMicroelectronics sales office.
www.st.com

1Hardware description
1.1 Board description
This board is based for TDA7803A and TDA7808 in PSO36 package. It is designed to provide 4 x 27 W on 4 Ω
load.
Figure 1. EVAL-7803APSO-SA board Top view
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Hardware description
UM2758 - Rev 1 page 2/13

Figure 2. EVAL-7803APSO-SA board Bottom view
Note: • Demo board are designed with scope to show typical device performance in standard application.
Furthermore, some components mounted on PCB could result downsized for satisfy a full performance
operation. Adequate heat dissipation must be provided for optimal performance: heatsink provided with
demo board ensures optimal dissipation when device is supplied with 14 V supply and a 4 Ω load is
connected to its outputs. For further information about high power measurements please contact ST
application team.
• The Figure 2 is taken without heatsink which is listed in the BOM reported in the Table 1.
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Board description
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1.2 Connector and connections
Power supply
The power supply, ranging from 4.5 V to 18.5 V, can be connected on J4 screw terminal following the labels.
Outputs
The amplifier outputs are present on J1, J2, J3, J8 screw terminal. The output assigned to each connection is
written nearby the connector
Input control signal
On J5 terminal is possible to find the I2C and I2S inputs. Additional control/monitor signals are available on this
connector: please refer to Section 1.3 Board option.
Board cascading
To test multiple device systems, is possible to connect more than one 469 modules together by means of J6 and
J7. Plugging J6 of one board to J7 of another, the I2C and I2S bus will be shared allowing to control the system by
means of one I2C interface and feed the same audio.
In order to command each device independently from each other, different addresses must be used on each 469
board. The number of 469 modules is limited by the maximum number of address that can be set.
1.3 Board option
Address selection
Proper I2C address for 469 module could be set by shorting with a 0 Ω resistor (or tin drop) one resistor from J9 to
J12. Please refer to TDA7901 datasheet for list of available addresses.
3.3 V voltage reference
On board 3.3 V reference (made by R1 and D1) is used for pull-up resistor of digital lines. When accurate current
measurement is needed (i.e. efficiency measurements) voltage reference should be disabled: in this case an
external 3.3v reference must be provided for 3V3 line.
STBY function
Stand by function can be hardware controlled by jumper P1 (3V3 →Device ON or GND → Device standby).
UNMUTE
Hardware unmute function is controlled by P3 (GND → device mute). By default these jumpers are left open
(device internal pull-up). P3 jumper allows also to remote control UNMUTE function through J10 connector (PIN
31, MUTE).
CD/DIAG
CD/DIAG function can be monitored through J10 connector, pin 19.
I2S data line pairing
If only one I2S data line is needed, SDA1 and SDA2 could be shorted through R9 with a 0 Ω (or tin drop).
1.4 Parallelized channels
TDA7803 provides the possibility to parallelize the channels to increase the output current capability. During this
operation one of the two channels in the parallel configuration will become the “Master” channel, the other one will
be the “Slave” channel.
The possible configurations are:
• CH1 and CH2 in parallel: CH1 is the master, CH2 is the slave
• CH3 and CH4 in parallel: CH3 is the master, CH4 is the slave
To use parallel configuration connect the two channels outputs close to the load, respecting output polarities.
Important:
When channels are parallelized, pay attention to the device’s configuration. Play signal with parallelized channels when the
device is configured for single output channels can lead to improper functioning
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Connector and connections
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1.5 Board schematic
Figure 3. EVAL-7803APSO-SA board schematic
F1
P&P Fiducial
F2
P&P Fiducial
F3
P&P Fiducial
F4
P&P Fiducial
SH
1
HS1
SK1 SK2
BUSES EXP CONNECT ORS
SCL
SDA
SCK
SDA2
SDA1
WS
SCK
WS
SDA1
SDA2
SCL
SDA
3V3
STD DONGLE CONNECT OR
TP3
TP2
SCL
SDA
SCK
SDA2
SDA1
WS
DGND
DGND
SDA2SDA1
DGND
CD/DIAG TP4
DGND
DGND
SCK
WS
SDA1
SDA2
SCL
SDA
MUTE
OUT4-
OUT4+
OUT1-
OUT1+
OUT2+
OUT2-
OUT3+
OUT3-
OUTPUT CONNECT ORS
OUT1+
OUT1-
OUT2+
OUT2-
OUT3-
OUT3+
OUT4-
OUT4+
TAB 1
OUT4- 2
VCC34 3
PWGND4 4
OUT4+ 5
NC 6
CD/DIAG 7
SDA 8
SCL 9
ADD 10
STDBY 11
WS 12
UNM UTEhw 13
OUT2+ 14
PWGND2 15
VCC12 16
OUT2- 17
TAB 18 TAB
19
OUT1-
20
VCC12
21
PWGND1
22
OUT1+
23
SCK
24
SD24
25
SD13
26
DGND
27
AGND
28
D3V3
29
A3V3
30
NC
31
OUT3+
32
PWGND3+
33
VCC34
34
OUT3-
35
TAB
36
TDA
7803
U1
TDA7803
GND GND
GND GND
VCC34 VCC34
VCC12 VCC12
SCK
SDA
SCL
WS
OUT2+
OUT2-
GND
GND
OUT1-
OUT1+
GND
OUT3+
OUT3-
GND
SDA2
SDA1
CD/DIAG
OUT4-
OUT4+
DGND
3V3
1
122
3
344
P1
2x2 p2.54mm M
1
122
3
344
P3
2x2 p2.54mm M
DGND
DGND
DGND
GND
GND
ADD
MUTE
ADDR2 ADDR1 RES
0 0 R6
0 1 R5
1 0 R4
1 1 R3
R3 91K
R4 56K
R6 10K
R5 36K
J9 0R NM
J10 0R NM
J11 0R NM
J12 0R NM
DGND
ADD
C3
100nF
VCC12Vbatt
+C1
2200uF
R1 1K
C4
100nF
VCC12
C5
100nF
VCC34
C6
100nF
VCC34
GND
3V3
GND AGND DGND
TP1
ADDRESS SELECTION NETWORK
D1
MMSZ5228BT1G
P4
Jumpe r
P2
Jumpe r
J1
J2
J3
J8
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
J6
8x2 p2.54mm M Horiz.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
J7
8x2 p2.54mm F Horiz.
2
4
6
8
10
1
3
5
7
9
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
J5
20x2 p2.54mm M Horiz.
J4
C1 1
4.7nF NM
C12
4.7nF NM
C31
4.7nF NM
C32
4.7nF NM
C41
4.7nF NM
C42
4.7nF NM
C22
4.7nF NM
C21
4.7nF NM
C7
22uF
C8
4.7uF
R1 1 0R
C10
1uF
R2 47K
R9 0R NM
R8 4K7 NM
R7 4K7 NM
R10 47K
C9
100pF
POWER STAGE
C2
220nF
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Board schematic
UM2758 - Rev 1 page 5/13

1.6 Bill of materials
Table 1. Bill of materials
Quantity Designator Description Value Rated V Package
1 C1 SMD Electrolityc Capacitor 2200 uF 25 V 19x19 d18 mm
1 C2 SMD MLCC X7R Capacitor 220 nF 25 V 0603
4 C3, C4, C5, C6 SMD MLCC X7R Capacitor 100 nF 25 V 0603
1 C7 SMD MLCC X7R Capacitor 22 uF 6.3 V 1206
1 C8 SMD MLCC X7R Capacitor 4.7 μF 10 V 0805
1 C9 SMD MLCC X7R Capacitor 100 pF 16 V 0603
1 C10 SMD MLCC X7R Capacitor 1 μF 25 V 0805
8C11, C12, C21, C22, C31,
C32, C41, C42 SMD MLCC X7R Capacitor 4 n7 25 V 0603
1 D1 3.9V Zener DIODE - 3.9 V SOD-123
1 HS1 HEATSINK - - -
5 J1, J2, J3, J4, J8 Terminal Block 2position p5.08mm - - p5.08 mm
1 J5 Header, 40-Pin, Dual row, TH, Right Angle, Male - - p2.54 mm
1 J6 Header, 8-Pin, Dual row, TH, Right Angle, Male - - p2.54 mm
1 J7 Header, 8-Pin, Dual row, TH, Right Angle, Female - - p2.54 mm
4 J9, J10, J11, J12 Solder Jumper 0805 - - 0805
2 P1, P3 Header, 2-Pin, Dual row, TH, Straight, Male - - p2.54 mm
2 P2, P4 Jumper shunt p2.54mm - - p2.54 mm
1 R1 Surface mount chip resistor 1 KΩ 75 V 0603
1 R2 Surface mount chip resistor 47 KΩ 75 V 0603
1 R3 Surface mount chip resistor 91 KΩ 75 V 0603
1 R4 Surface mount chip resistor 56 KΩ 75 V 0603
1 R5 Surface mount chip resistor 36 KΩ 75 V 0603
1 R6 Surface mount chip resistor 10 KΩ 75 V 0603
2 R7, R8 Surface mount chip resistor 4.7 KΩ 75 V 0603
1 R9 Surface mount chip resistor 0 Ω 75 V 0603
1 R10 Surface mount chip resistor 47 KΩ 75 V 0603
1 R11 Surface mount chip resistor 0 Ω 200 V 1206
2 SK1, SK2 M3 Fastener - - -
1 U1 4 Channel Class AB Amplifier - - PSO36
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Bill of materials
UM2758 - Rev 1 page 6/13

1.7 Board layout
Figure 4. Assembly top
Figure 5. Inner 1
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Board layout
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Figure 6. inner 2
Figure 7. Assembly bottom
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Board layout
UM2758 - Rev 1 page 8/13

2Information on board use
This evaluation board/kit is intended to be used for ENGINEERING DEVELOPMENT, DEMONSTRATION OR
EVALUATION PURPOSES ONLY and it is not considered by ST Microelectronics (ST) a finished end product fit
for general consumer use. People handling the product(s) must have electronics training and observe good
engineering practice standards. As such, the goods being provided are not intended to be complete in terms of
required design-, marketing- and/or manufacturing-related protective considerations, including product safety and
environmental measures typically found in end products that incorporate such semiconductor components or
circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore
they may not meet the technical requirements of these directives or other related directives.
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Information on board use
UM2758 - Rev 1 page 9/13

Revision history
Table 2. Document revision history
Date Version Changes
05-Aug-2020 1 Initial release.
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UM2758 - Rev 1 page 10/13