The Audio Converter & Amplifier (Back), manufactured by FREENOVE, with part ID ES7148/PAM8403, is a versatile device designed to convert audio signals from one format to another while amplifying the signal. This component is ideal for applications requiring enhanced sound quality and volume, such as driving speakers or headphones. It combines the functionality of an audio signal converter and a low-power audio amplifier, making it a compact and efficient solution for audio projects.
Parameter | Value |
---|---|
Manufacturer | FREENOVE |
Part ID | ES7148/PAM8403 |
Operating Voltage | 2.5V to 5.5V |
Output Power | 3W per channel (stereo) at 4Ω, 5V supply |
Signal-to-Noise Ratio | ≥ 90 dB |
Total Harmonic Distortion | ≤ 0.1% |
Input Signal Format | I2S (Inter-IC Sound) |
Output Signal Format | Analog audio |
Amplifier Type | Class D |
Efficiency | Up to 90% |
Operating Temperature | -40°C to +85°C |
The Audio Converter & Amplifier (Back) has the following pin configuration:
Pin Name | Pin Number | Description |
---|---|---|
VCC | 1 | Power supply input (2.5V to 5.5V) |
GND | 2 | Ground connection |
LRCK | 3 | Left/Right clock input for I2S signal |
BCK | 4 | Bit clock input for I2S signal |
DIN | 5 | Data input for I2S signal |
LOUT+ | 6 | Positive output for left audio channel |
LOUT- | 7 | Negative output for left audio channel |
ROUT+ | 8 | Positive output for right audio channel |
ROUT- | 9 | Negative output for right audio channel |
EN | 10 | Enable pin (active high) to power the device |
The Audio Converter & Amplifier (Back) can be connected to an Arduino UNO to play audio. Below is an example code snippet:
#include <Arduino.h>
// Define I2S pins for the Audio Converter & Amplifier
#define LRCK_PIN 3 // Left/Right clock pin
#define BCK_PIN 4 // Bit clock pin
#define DIN_PIN 5 // Data input pin
#define EN_PIN 6 // Enable pin
void setup() {
// Set up the I2S pins
pinMode(LRCK_PIN, OUTPUT);
pinMode(BCK_PIN, OUTPUT);
pinMode(DIN_PIN, OUTPUT);
pinMode(EN_PIN, OUTPUT);
// Enable the Audio Converter & Amplifier
digitalWrite(EN_PIN, HIGH);
// Initialize serial communication for debugging
Serial.begin(9600);
Serial.println("Audio Converter & Amplifier Initialized");
}
void loop() {
// Example: Generate a simple square wave on the DIN pin
digitalWrite(DIN_PIN, HIGH);
delayMicroseconds(500); // Adjust for desired frequency
digitalWrite(DIN_PIN, LOW);
delayMicroseconds(500);
}
No Audio Output:
Distorted Audio:
Overheating:
Low Volume:
Q1: Can this component drive headphones directly?
A1: Yes, the component can drive headphones with an impedance of 32Ω or higher.
Q2: Is it compatible with 3.3V microcontrollers?
A2: Yes, the component operates within a voltage range of 2.5V to 5.5V, making it compatible with 3.3V systems.
Q3: Can I use this with a mono speaker?
A3: Yes, you can connect only one channel (left or right) to a mono speaker.
Q4: What is the maximum cable length for I2S signals?
A4: Keep the I2S signal traces or cables as short as possible (preferably under 10 cm) to minimize signal degradation.
Q5: Does it support other audio input formats?
A5: No, this component only supports I2S as the input format.