Overview

The TDA2822 (and 8-pin mini-DIP TDA2822M) is a dual low-voltage audio power amplifier IC manufactured by STMicroelectronics. Designed for portable battery-powered cassette players, radios, intercoms, and active computer speakers, it operates over a wide supply voltage range from 1.8V to 15.0V DC with a low crossover distortion and a low quiescent current of 6mA.

The chip can be configured in two distinct modes:

  1. Stereo Mode: Drives two independent 4 Ω…32 Ω4\ \Omega \dots 32\ \Omega channels (speakers or headphones) delivering up to 1.0W1.0\text{W} per channel at 9V9\text{V} supply.
  2. Bridge-Tied Load (BTL) Mono Mode: Combines both internal amplifiers to double output voltage swing, delivering up to 2.0W2.0\text{W} into an 8 Ω8\ \Omega speaker without requiring output DC blocking capacitors.

Quick reference

Operating Supply Voltage (VCC)1.8 V to 15.0 V DC (TDA2822M) / up to 12.0 V (TDA2822)
Output Power (Stereo 4Ω)0.65W+0.65W0.65\text{W} + 0.65\text{W} at 6V6\text{V} / 1.0W+1.0W1.0\text{W} + 1.0\text{W} at 9V9\text{V}
Output Power (BTL Mono 8Ω)1.35W1.35\text{W} at 6V6\text{V} / 2.0W2.0\text{W} at 9V9\text{V}
Quiescent Current (ICC)6.0 mA6.0\text{ mA} typical (VCC=6VVCC = 6\text{V})
Total Harmonic Distortion (THD)0.2%0.2\% typical (POUT=0.5W,f=1kHzP_{OUT} = 0.5\text{W}, f = 1\text{kHz})
Package8-pin Minidip / SOIC-8 / Breakout Module

Pinout (TDA2822M DIP-8 / SOIC-8)

text
             ┌───┴───┐
       OUT1 1│ 1   8 │ OUT2
        VCC 2│       │ 7 +IN1
       OUT2 3│TDA2822│ 6 -IN1
        GND 4│   M   │ 5 -IN2
             └───────┘

Note: Pin 1 and Pin 3 are internally shorted output connections for Channel 1/Channel 2 feedback networks depending on layout.

PinNameTypeDescription
1OUT1OutputChannel 1 Amplifier Output
2VCCPowerPositive DC supply power input (+1.8V to +15.0V DC)
3OUT2OutputChannel 2 Amplifier Output
4GNDPowerSystem ground reference (0 V)
5-IN2InputChannel 2 Inverting Input
6+IN2InputChannel 2 Non-Inverting Input
7+IN1InputChannel 1 Non-Inverting Input
8-IN1InputChannel 1 Inverting Input

Specifications

ParameterSymbolMinTypMaxUnitConditions
Supply VoltageVCCV_{CC}1.86.015.0VDC
Quiescent Supply CurrentICCI_{CC}—6.012.0mAVCC=6.0V,RL=∞V_{CC} = 6.0\text{V}, R_L = \infty
Output Power (Stereo)POP_O0.40.65—WVCC=6V,RL=4Ω,d=10%V_{CC}=6\text{V}, R_L=4\Omega, d=10\%
Output Power (BTL Mono)POP_O0.91.35—WVCC=6V,RL=8Ω,d=10%V_{CC}=6\text{V}, R_L=8\Omega, d=10\%
Total Harmonic Distortiondd—0.2—%VCC=6V,RL=4Ω,PO=0.5WV_{CC}=6\text{V}, R_L=4\Omega, P_O=0.5\text{W}
Closed Loop Voltage GainGVG_V363941dBStereo mode

Application Circuits

1. Stereo Application Circuit

text
  Left In  ───[10µF]─── [Pin 7: +IN1]    [Pin 1: OUT1] ───[470µF Cap]─── (+) [ LEFT SPEAKER 4Ω ] (-) ─── GND
                                TDA2822M
  Right In ───[10µF]─── [Pin 6: +IN2]    [Pin 3: OUT2] ───[470µF Cap]─── (+) [ RIGHT SPEAKER 4Ω ] (-) ── GND
                                [Pin 2: VCC] ─── +6V .. +9V DC
                                [Pin 4: GND] ─── GND

2. Bridge-Tied Load (BTL) Mono Application Circuit

In BTL mode, the speaker is connected directly between Pin 1 (OUT1) and Pin 3 (OUT2) without output DC blocking capacitors.

text
  Audio In ───[10µF]─── [Pin 7: +IN1]    [Pin 1: OUT1] ─────── (+) [ 8Ω SPEAKER ]
                                TDA2822M                            │
                        [Pin 6: +IN2]    [Pin 3: OUT2] ─────── (-) ─┘
                                [Pin 2: VCC] ─── +6V .. +9V DC
                                [Pin 4: GND] ─── GND

Common mistakes

  • Forgetting output DC coupling capacitors in Stereo Mode: In stereo mode, OUT1 and OUT2 rest at half supply voltage (VCC/2V_{CC} / 2). Connecting speakers directly without 220 μF…470 μF220\ \mu\text{F} \dots 470\ \mu\text{F} coupling capacitors will burn out the speaker voice coils.
  • Connecting speaker to GND in BTL Mono Mode: In BTL mode, the speaker must be connected across OUT1 and OUT2. Connecting either side of the speaker to GND in BTL mode shorts out one amplifier channel.
  • High high-frequency oscillation: The TDA2822 has high gain. If wiring traces are long, add a Boucherot cell (4.7 Ω4.7\ \Omega resistor in series with a 100 nF100\text{ nF} ceramic capacitor) from OUT1 and OUT2 to GND to prevent high-frequency self-oscillation.

Notes

  • TDA2822 vs LM386 vs PAM8403: TDA2822 is a stereo/BTL Class-AB IC operating down to 1.8V (ideal for 2x AA batteries); LM386 is single-channel mono requiring ≥4V\ge 4\text{V}; PAM8403 is a 3W stereo Class-D digital amplifier with high efficiency (>90%>90\%).

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