What Is a TDA2822M Low-Voltage Power Amplifier?

What Is TDA2822M?
1. The TDA2822M is a monolithic integrated circuit, meaning all its components are fabricated together on a single chip of semiconductor material.
2. It comes in an 8 DIP package, a type of through-hole package.
3. The TDA2822M is designed primarily as a dual audio power amplifier.
4. It can drive two separate audio channels for stereo applications, such as in portable cassette players and radios.
Pinout of TDA2822M
Here's the correct pinout for the TDA2822M:
Pin 1 (OUT1): Output for the first audio channel.
Pin 2 (Vcc): Power supply voltage.
Pin 3 (OUT2): Output for the second audio channel.
Pin 4 (GND): Ground connection.
Pin 5 (IN2-): Inverting input for the second audio channel.
Pin 6 (IN2+): Non-inverting input for the second audio channel.
Pin 7 (IN1+): Non-inverting input for the first audio channel.
Pin 8 (IN1-): Inverting input for the first audio channel.
Circuit Description of TDA2822M
In a typical circuit, the supply voltage is provided to the chip through Pin 2 (Vcc), with Pin 4 (GND) connected to the ground. The audio signal is input via Pin 7 (IN1+) and Pin 8 (IN1-), and after being amplified by the internal circuitry, the amplified signal is output through Pin 1 (OUT1). For the second channel, the input signal enters through Pin 5 (IN2-) and Pin 6 (IN2+), with the output signal delivered through Pin 3 (OUT2). The current flows from Vcc to OUT, passing through the load, such as a speaker, and then returns to GND, completing the circuit loop.
Specification of TDA2822M
Operating Voltage Range: 1.8V to 15V
Max Output Power x Channels @ Load: 2W x 1 @ 16Ohm; 1W x 2 @ 8Ohm
Quiescent Current: 6mA at Vcc = 3V
Input Bias Current: 100nA
Voltage Gain: 39dB (fixed internally)
Total Harmonic Distortion (THD): 0.1% at 1kHz and 200mW output
Supply Current (No Signal): 9mA
Channel Separation:52dB
Power Supply Rejection Ratio (PSRR): 45dB
Bandwidth: 20Hz to 20kHz
Input Impedance: 100kΩ
Output Impedance: 4Ω and 8Ω loads
Operating Temperature Range: -20°C to +70°C
Features of TDA2822M
- Supply Voltage Down to 1.8V
- Low Crossover Distorsion
- Low Quiescent Current
- Bridge or Stereo Configuration
- Dual Channel
- Wide Operating Voltage Range
- High Gain
Where to Use TDA2822M?
The TDA2822M is suitable for various devices that require low-power audio amplification. It is commonly used in portable audio systems, radios, portable cassette players, and small audio devices due to its low power consumption and efficient performance, making it ideal for battery-powered applications. Additionally, it can be used in small home audio systems, electronic toys, and other devices that require compact audio amplification.
How Do You Choose and Use TDA2822M?
First, identify the application scenario and check the power requirements, ensuring that the TDA2822M operates within its voltage range of 1.8V to 15V. Next, choose the appropriate speaker impedance, typically 4Ω or 8Ω, to match the output of the TDA2822M.
Next, correctly connect the TDA2822M to the circuit board according to its pinout configuration. Connect the positive power supply to Pin 2 (Vcc) and the ground to Pin 4 (GND). Input the audio signal to Pin 7 (IN1+) and Pin 8 (IN1-), then connect the speaker or other output device to Pin 1 (OUT1). For dual-channel applications, repeat the same steps by inputting the second audio signal to Pin 5 (IN2-) and Pin 6 (IN2+), and connect the speaker to Pin 3 (OUT2).
Finally, ensure all connections are secure. Before powering the circuit, it's best to check the voltage with a multimeter. After powering on, adjust the audio signal and power voltage according to the specific application requirements.
Alternatives of TDA2822M
Alternative models to the TDA2822M include the LM386, TDA7052, KA2209, TDA7377, TEA2025B, AN7147, and NJM2073, among others. These alternatives offer similar functions and performance to the TDA2822M and can be used in comparable applications.
FAQs
How do I connect the TDA2822M to a circuit?
The power supply is connected to Pin 2 (Vcc) and Pin 4 (GND). Audio signals are input through Pins 7 (IN1+) and 8 (IN1-), with output through Pin 1 (OUT1) for one channel. The second channel follows a similar configuration.
Can the TDA2822M be used in bridge mode?
Yes, the TDA2822M can be configured in bridge mode to drive a single speaker with higher output power, although this typically involves modifying the standard application circuit.
What are the benefits of using the TDA2822M in portable devices?
The TDA2822M is highly efficient, has low power consumption, and operates over a wide voltage range
Can the TDA2822M be used in high-power applications?
The TDA2822M is best suited for low to medium power applications. For high-power applications, other amplifiers designed for higher output power would be more appropriate.