Adafruit TPA2016 Stereo 2.8W Class D Audio Amp with I2C AGC | thingbits

Adafruit TPA2016 Stereo 2.8W Class D Audio Amp with I2C AGC

Name: Adafruit TPA2016 Stereo 2.8W Class D Audio Amp with I2C AGC
SKU: TH1989
Price: 979.0 INR
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SKU: TH1989

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The Adafruit TPA2016 Stereo 2.8W Class D Audio Amp with I2C AGC is a compact stereo amplifier breakout designed for embedded audio projects that need efficient power delivery and software control. Built around the Texas Instruments TPA2016 Class-D amplifier, it can deliver up to 2.8W per channel into 4-ohm speakers when powered from a 5V supply, making it suitable for small speakers in portable and desktop designs.

₹1,155.22

₹979.00 (Ex. of GST)

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Overview

This board features an I2C control interface that allows you to configure output gain and automatic gain control (AGC) parameters in software. The integrated AGC helps prevent clipping and distortion when audio levels fluctuate, which is especially useful for music playback and voice output. On startup, the amplifier defaults to a 6dB gain with AGC enabled, allowing it to work without firmware configuration, although any custom gain or AGC settings must be re-applied on every power-up since they are not stored internally.

Operating from a wide 2.7V to 5.5V supply range, the TPA2016 achieves high efficiency typical of Class-D amplifiers, reaching up to around 89% efficiency under normal loads. The audio inputs are differential and include onboard coupling capacitors for improved noise immunity. The outputs are bridge-tied, meaning the speakers are driven directly without a ground reference and without the need for output coupling capacitors or filters, provided speaker leads are kept short.

The amplifier includes built-in thermal shutdown and over-current protection for reliable operation in compact enclosures and battery-powered projects. It is intended to drive 4-ohm or 8-ohm speakers directly and should not be connected to another amplifier stage. As a result, this board is a solid upgrade over basic analog audio amplifiers, offering better efficiency, cleaner sound, and fine-grained digital control from Adafruit.

Specification

Technical details for Adafruit TPA2016 Stereo 2.8W Class D Audio Amp with I2C AGC.

Specification	Details
Amplifier Type	Stereo Class D Audio Amplifier (Bridge-Tied Load)
Amplifier IC	Texas Instruments TPA2016
Supply Voltage	2.7V – 5.5V DC
Output Power (5V Supply)	2 × 2.8W @ 4Ω, 10% THD; 2 × 1.7W @ 8Ω, 10% THD
Efficiency	Up to 89% (8Ω at ~1.5W)
Control Interface	I2C (Gain + AGC configuration)
Gain Range	Selectable from −28dB to +30dB
Default Startup Settings	Starts with 6dB gain and AGC enabled (music-friendly defaults)
Automatic Gain Control (AGC)	Built-in AGC with configurable parameters
Input Type	Differential inputs with onboard 1.0µF coupling capacitors
Single-Ended Input Use	Tie L− and R− to GND for non-differential sources
Output Type	Bridge-tied speaker outputs (no output pin tied to GND)
Output Signal	~300kHz PWM (speaker coil averages the output)
Output Filter Requirement	Designed for use without an external output filter (keep speaker wires ~2"–4" or shorter)
PSRR	80 dB
Pop/Click Suppression	Excellent click-and-pop suppression
Protection	Thermal shutdown and over-current protection
Shutdown Feature	Dedicated shutdown pin for power-saving mode
Current Consumption	3.5mA quiescent; 0.2µA in shutdown
Included	Assembled & tested breakout, 3.5mm screw-terminal blocks, header pins

Pinout

Pin	Description
SPK_L+	Left channel speaker positive output (Bridge-Tied Load). Connect directly to speaker.
SPK_L−	Left channel speaker negative output (Bridge-Tied Load). Do not connect to ground.
SPK_R+	Right channel speaker positive output (Bridge-Tied Load). Connect directly to speaker.
SPK_R−	Right channel speaker negative output (Bridge-Tied Load). Do not connect to ground.
VDD	Main power supply input for the amplifier (2.7V–5.5V DC). Higher voltage provides higher output power.
GND	Ground reference for power and signals.
SHDN	Shutdown control pin. Pull LOW to disable both amplifier channels. Internally pulled up to VDD, so the amplifier is enabled by default. Per-channel shutdown is available only via I2C.
L+	Left channel audio input positive. Use for differential or single-ended input.
L−	Left channel audio input negative. Tie to ground for single-ended input.
R+	Right channel audio input positive. Use for differential or single-ended input.
R−	Right channel audio input negative. Tie to ground for single-ended input.
SCL	I2C clock line for gain and AGC configuration. Onboard 10kΩ pull-up included.
SDA	I2C data line for gain and AGC configuration. Onboard 10kΩ pull-up included.
I2C VCC	Logic-level reference for the I2C interface. Connect to the microcontroller logic voltage (3V or 5V). Allows 5V amplifier power with 3V I2C logic.