Get to Know the TDA2822M Audio Amplifier
23 January 2024
Ⅱ. What are the features of TDA2822M?
Ⅳ. Structure and working principle of TDA2822M
Ⅵ. What are the applications of TDA2822M?
Ⅶ. What is the difference between TDA2822M and TDA2822?
Ⅷ. How to measure the output power and power consumption of TDA2822M?
TDA2822M is an early dual-channel monolithic power amplifier integrated circuit developed by STMicroelectronics specifically for portable recording and playback equipment. It has the characteristics of low crossover distortion and low quiescent current, and is suitable for stereo and bridge amplification (BTL) modes. This article will introduce it from the aspects of characteristics, specifications, structure, application, etc., and attach a working principle diagram.
TDA2822M is an audio power amplifier integrated circuit manufactured by STMicroelectronics. Since the early 1990s, it has been widely used in portable radio recorders by domestic and foreign home appliance manufacturers. TDA2822M is also a common component in higher-power Walkman products, especially those equipped with body speakers. Its nominal output power can reach 1W in stereo mode and 2W in bridge mode. The unique feature of TDA2822M is its wide operating voltage range, which can operate normally within the voltage range of 2V to 12V. However, except when used in headphone amplifiers, it is recommended to operate the TDA2822M at a voltage above 3V to ensure optimal performance and stability.
Alternatives and equivalents:
• NJM2073D
TDA2822M usually has the following characteristics:
• Small package: It usually comes in a small package, which facilitates use in space-constrained applications.
• Low power consumption: TDA2822M generally has low power consumption and is suitable for battery-operated equipment that requires long-term operation.
• Dual-channel design: TDA2822M is a dual-channel (stereo) audio amplifier suitable for driving two speakers, making it suitable for audio amplification applications.
• Built-in short circuit and overheating protection: TDA2822M usually has built-in short circuit and overheating protection circuitry, which can improve the reliability and durability of the chip.
• Low voltage operation: This chip is designed to operate at lower supply voltages, usually in the range of 3V to 15V. This makes it suitable for portable devices and battery-powered applications.
• Wide operating voltage range: The chip is typically capable of operating over a wide supply voltage range, making it more flexible and adaptable to different power supply conditions. This characteristic allows the chip to work normally in various electronic devices without worrying about the power supply voltage.
TDA2822M uses integrated circuit technology and is composed of multiple transistors, capacitors and resistors. Specifically, it includes two identical operational amplifier circuits, and each operational amplifier circuit includes an input stage, a differential amplifier stage, an output stage and a feedback network.
TDA2822M adopts symmetrical power supply, allowing it to work under single power supply conditions. It has excellent spurious suppression capabilities to ensure pure output of audio signals. Its working principle is to receive the two-channel signal from the audio source, amplify it and output it. Through the action of the capacitor, the output AC signal is converted into a DC signal. In addition, a protection mechanism is integrated inside the chip to prevent problems such as overheating or load imbalance, ensuring the stability and reliability of the audio output.
The ① and ③ pins of TDA2822M are directly connected to both ends of the speaker, while the ② pin is connected to the 5V voltage. In the circuit, the power amplifier circuit is connected to a BTL (bridge tied load) output. This connection method can increase the output power by 3 to 4 times, while improving the sound quality and reducing distortion. C14, C15, C8 and C9 are connected to electrolytic capacitors to allow the voice signal to pass smoothly while filtering out interference signals. C16 and C17 are frequency selective circuits used to isolate unnecessary high-frequency signals. The 104 capacitor and 47uF electrolytic capacitor we connected to pin ② are mainly used for voltage stabilization and filtering. The circuit connection method of TDA2822M is shown in the figure above.
• Car audio: In some car audio systems, the chip can act as an amplifier to amplify the audio signal to drive the speaker system in the car.
• MP3 players: In small portable audio devices, the TDA2822M can be used to amplify audio signals from MP3 players to drive headphones or small speakers.
• Portable radio: TDA2822M can be used to drive the speakers of portable radios to provide audio amplification, enabling users to better hear broadcast programs.
• Small speaker amplifiers: The TDA2822M is suitable for a variety of small speaker amplifiers. For example, in portable electronic devices such as computer stereos and mini speakers, we can obtain excellent sound effects by matching resistors and capacitors appropriately.
• TV and multimedia applications: The chip can also be used for audio amplification in TVs, multimedia players and other entertainment electronic devices. In these devices, the TDA2822M will perform audio amplification to provide consumers with clear and dynamic sound quality. By combining perfectly with TVs, multimedia players and other devices, the TDA2822M has become an integral part of modern entertainment electronics, meeting the demand for a high-quality audio experience.
• Educational experiments: Due to its ease of use and stability, the chip is also often used in educational experiments. As a practical audio amplification circuit, it is not only equipped with powerful amplification functions, but also has high stability. Therefore, many schools and educational institutions have introduced the TDA2822M circuit module into classrooms and practical teaching to help students better understand the basic principles of audio amplification circuits.
The packages of TDA2822M and TDA2822 are the same, but there are some differences between them in terms of operating voltage and output power. The TDA2822M can operate normally in a voltage range from 3V to 15V, while the maximum operating voltage of TDA2822 is only 8V. The TDA2822M exhibits a relatively high output power in dual-channel mode, as it correlates with an increase in voltage, leading to higher power output.
The TDA2822M and TDA2822 are dual-channel monolithic power amplifier integrated circuits developed by ST, which are typically used in devices such as recorders, pocket-sized cassette players and multimedia active speakers. As an audio amplifier. It has the advantages of simple circuitry, good sound quality, wide voltage range, etc. It is suitable for both stereo expansion part and bridge type expansion circuit way.
When making measurements, we need to prepare some equipment, including an ammeter, voltmeter, multimeter, and an appropriate load. First, we connect the output of TDA2822M to the load. Then use a voltmeter to measure the voltage across the load and an ammeter to measure the current flowing through the load. From the measured voltage and current values, we can calculate the output power (Pout = V * I).
Next, we use a multimeter to measure the supply voltage and supply current of the TDA2822M. Again, based on the measured voltage and current values, we can calculate the power consumption (P = V * I). Finally, we calculate the efficiency (Eff = Pout / P) based on the output power and power consumption. With these measurements and calculations, we can evaluate the performance of the TDA2822M in real applications.
It is important to note that in order to obtain accurate measurements, we need to select a suitable load and make appropriate adjustments based on the operating voltage and current of the TDA2822M. Meanwhile, in order to minimize the error, we need to make several measurements and take the average value.
Frequently Asked Questions
1. What is the operating temperature range of TDA2822M?
The operating temperature of TDA2822M ranges from -40°C to 85°C.
2. What is the use of TDA2822M?
It is intended for use as dual audio power amplifier in portable cassette players and radios. DIM. mm inch MIN.
3. What is the input voltage for TDA2822M?
The TDA2822M IC has a wide range of acceptable input voltage levels. The recommended input voltage for the TDA2822M is typically between 0.3V and VCC (supply voltage).
4. What is the difference between TDA2822 and TDA2822M?
Integrated circuit TDA2822M for the 8-pin double inline package, if you can not buy TDA2822 instead, TDA2822 package and TDA2822M the same, they differ: TDA2822M from 3V to 15V can work, while the TDA2822 maximum operating voltage of only 8V. use TDA2822 must be lowered to 8V or less.
