ST EVAL-TDA7803A User manual
Introduction
This note provides preliminary information about how to operate the boards offered to evaluate two components in FW27
package: TDA7803A and TDA7808.
This document describes how to use the evaluation board in order to check devices performance; for any other information and
deeper details please refer to the TDA7803A and TDA7808 datasheet (see Appendix A).
Evaluation board for TDA7803A and TDA7808 power amplifiers
UM2376
User manual
UM2376 - Rev 2 - August 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
1Hardware description
1.1 Board description
Figure 1. EVAL-TDA7803A board Top view
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Hardware description
UM2376 - Rev 2 page 2/14
1.2 Application circuit
The basic application diagram is shown in Figure 2. A key components description and a suggestion about how to
choose the right components, are respectively shown in Table 1.
Figure 2. EVAL-TDA7803A application circuit
WS
S CK
OUT RF / OUT3
OUT R R / OUT4
OUT LF / OUT1
OUT LR / OUT2
C4
22µF
C3
4.7µF
TAB
Vpull-up
-
+
-
+
-
+
-
+
Vcc 1 Vcc 2
13
12
11
3
27
26
2
14 17 16 25
47KΩ
21 18
19
20
24
23
22
10
9
8
4
5
6
1
DGND
15
AGND
CD/DIAG
S D2_4
S D1_3
C1
0.22µF
C2
2200µF
7
TDA7803A
TDA7808
R2
I2S INP UT
Vs
I2C BUS DATA
CLK
V ST-BY
Note: • C3 and C4 capacitors must be SMD ceramic types.
• GND separations unnecessary if a dedicated ground layer is available at PCBoard level.
Table 1. EVAL-TDA7803A components description
Component
name
Recomm.
value
Min/Max
value Purpose Lower than
recomm.
Higher than
recomm. Notes
C1 0.1 μF 0.1 μF/0.47
μF ± 20% Vbatt HF filter
Danger of high
frequency
instabilities
Lower HF
suppression
low-ESR type (e.g.
X7R). Placed very
close to the IC
C2 2200 μF 1000 μF min Vbatt LF filte Higher ripple
Audio
performance
improvment
Standard electrolytic/
25 V. Reasonably
close to the IC
C3 4.7 μF 2.2 μF/10 μF
± 20%
Supply filter of
the IC's digital
section
instability dysfunction low-ESR type (e.g.
X7R)
C4 22 μF 10 μF/47 μF
Supply filter of
the IC's analog
section
instability dysfunction low-ESR type (e.g.
X7R)
R2 47 KΩ 10 KΩ/75 KΩ CD/DIAG pull-up dysfunction dysfunction -
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Application circuit
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2Board operation
Before any operation, please insert the power amplifier in the socket provided with the board.
A heat-sink (not provided) has to be used. Please refer to Section 3 Power dissipation/Heat-sink to choose the
right heat-sink.
A supply voltage (battery voltage or equivalent) on VS-GND connectors, between 6 V and 18 V, is needed to
operate the board.
Please refer to datasheet to understand load impedance compatibility of power amplifiers, then connect resistive
loads (or speakers) to OUT1, OUT2, OUT3, OUT4 connectors.
I2S format (SDA, CLK, WS lines) has to be used for input audio signals.
I2C bus format (SDA, CLK lines) is necessary for sending any operation instructions to the IC.
HW Mute and Standby should be disabled (both are active low).
The TDA7803A power amplifier can only operate with I2C bus active.
The IC can work in high efficiency mode too (please, refer to datasheet). This operating mode can be selected
through the I2C bus.
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Board operation
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3Power dissipation/Heat-sink
The heat-sink size / characteristics largely depend on the operating conditions and consequently power
dissipation levels are implied. Dissipation can be higher if sine test tones are used instead of music or audio-
simulation signals (e.g. Pink Noise).
Considering the standard car-radio conditions (Vs = 14 V, RL = 4 Ω, 4-CH operation), the Pdiss levels implied are
as follows (STD mode / SB-I mode @ Tamb = 70 °C , Tj-max = 150 °C):
• SINE WAVE: Pdiss = 42 W / 38 Rth htsk = 1.9 °C/W / 2.1 °C/W
• PINK NOISE: Pdiss = 30 W / 18 Rth htsk = 12.7 °C/W / 4.4 °C/W
If sine-wave trials (especially with 4-CH operation / RL = 2 Ω) are to be run, then the heatsink
has to be replaced by a larger / lower-Rth one.
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Power dissipation/Heat-sink
UM2376 - Rev 2 page 5/14
4High frequency output waveforms
In SB-I mode the speaker signal (OUT-OUT) is the sum of the signals at OUT+ and OUT- pins, which are not
sinusoidal (in STD mode they are). Here below it is reported an oscilloscope snapshot, which shows the output
waveforms in SB-I mode (@ Po > 2.5 W / 4 Ω).
Figure 3. Output signals in high efficiency mode
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High frequency output waveforms
UM2376 - Rev 2 page 6/14
5Demo board schematic
Figure 4. EVAL-TDA7803A Demo board schematic
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Demo board schematic
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6Information 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.
UM2376
Information on board use
UM2376 - Rev 2 page 8/14
Appendix A Reference documents
Table 2. Reference documents
Doc Name ID Title
DS12195 030745 High efficiency digital input automotive quad power amplifier with built-in diagnostics features, 'start stop'
compatible
DS12230 030826 High efficiency digital input automotive quad power amplifier, 'start stop' compatible
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Reference documents
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Revision history
Table 3. Document revision history
Date Version Changes
05-Apr-2018 1 Initial release.
05-Aug-2020 2 Removed PSO package.
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UM2376 - Rev 2 page 10/14
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