TDA2822 is a dual-channel monolithic power amplifier integrated circuit developed by STMicroelectronics (ST). It has the characteristics of a simple circuit, good sound quality, and a wide voltage range.

1. TDA2822 features, pin functions and
application circuits
TDA2822 is a dual-channel monolithic power amplifier
integrated circuit developed by STMicroelectronics (ST). It
has the characteristics of simple circuit, good sound
quality and wide voltage range. It can work in stereo and
bridge amplifier (BTL) circuit form. It is usually used as
an audio amplifier in pocket cassette players (WALKMAN),
radio cassette recorders and multimedia active speakers.
This article will introduce its characteristics, pin
functions, application circuits and so on.
1. Chip characteristics
Low quiescent current and low crossover distortion
Applicable to two working states of mono bridge (BTL) or
stereo line
Use dual in-line 8-pin plastic package (DIP-8) and SMD
(SOP-8) package

2. Wide power supply voltage range (1.8 ～ 15V, TDA2822M), it
can still work when the power supply voltage is as low as
1.8V
2. Structure diagram
Figure 2 TDA2822 structure diagram
3. Pin configuration

3. Figure 3 TDA2822 pin arrangement diagram
Pin function table
Pin number symbol functions
1 OUT(1) 1 Channel output
2 Vcc power supply
3 OUT(2) 2 Channel output
4 GND Ground
5 IN-(2) 2 Channel
inverting input
6 IN+(2) 2 Channel non-
inverting input

4. 7 IN+(1) 1 Channel non-
inverting input
8 IN-(1) 1 Channel
inverting input
4. Working voltage
The working voltage of tda2822 is divided into two types:
one 3-6V; the other 9-12V. In fact, his minimum working
voltage can reach 1.8V.
Storage
temperature
5. Application circuit
Stereo application circuit

5. Figure 4 Typical application of Stereo stereo amplifier
Mono BTL application circuit
Figure 5 Typical application of Bridge Mono Bridge (BTL)
amplifier
6. Example application

6. Figure 6 is the microphone amplifier circuit of this
microphone, with few external components, simple
production, but unexpectedly good sound quality. Using a
dual-channel audio amplifier integrated circuit. Its main
features are high efficiency and low power consumption. The
typical value of the quiescent operating current is only
about 6mA. The integrated circuit has strong voltage
adaptability (1.8V ~ 15VDC). Even when used at a low
voltage of 1.8V, there will still be about 100mW Power
output, as shown in the figure.
Figure 6 microphone power amplifier circuit diagram
Working principle

7. The electret microphone MIC converts the picked-up sound
signal into an electrical signal, then introduces it from
the ② pin of U1 through C2 and W, and after the audio
amplification of U1, the speaker is pushed to pronounce.
This machine is connected to a BTL output circuit, which is
good for improving sound quality and reducing distortion.
At the same time, the output power is also increased by 4
times. When 3V power is supplied, the output power is
350mW.