How to Use TA6568: Examples, Pinouts, and Specs

The TA6568 is a dual operational amplifier (op-amp) designed for audio amplification and signal conditioning applications. It is characterized by its high input impedance and low output impedance, which makes it an excellent choice for interfacing with high-impedance sources and driving low-impedance loads, such as headphones or speakers. The TA6568 is commonly used in pre-amplifiers, active filters, and audio mixers.

• Supply Voltage (V_CC): ±3V to ±15V
• Input Offset Voltage: 3mV (max)
• Input Bias Current: 500nA (max)
• Slew Rate: 1V/µs (typ)
• Gain Bandwidth Product: 10MHz (typ)

To use the TA6568 in a circuit, connect the power supply to pins 4 (V_EE) and 8 (V_CC), ensuring that the supply voltage does not exceed the specified limits. Connect the input signal to the non-inverting input (IN1+ or IN2+) for a non-inverted output, or to the inverting input (IN1- or IN2-) for an inverted output. The output can be taken from OUT1 or OUT2.

• Use bypass capacitors close to the power supply pins to minimize noise.
• Keep signal paths short to reduce interference.
• Ensure proper grounding to avoid ground loops.
• Use feedback resistors to set the desired gain for the amplifier.

// Code to control volume of audio signal using Arduino UNO and TA6568

const int analogInPin = A0; // Analog input pin for potentiometer
const int analogOutPin = 9; // PWM output pin connected to TA6568 volume control

int sensorValue = 0;        // Value read from the potentiometer
int outputValue = 0;        // Value output to the PWM (analog out)

void setup() {
  // Initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

void loop() {
  // Read the potentiometer value
  sensorValue = analogRead(analogInPin);
  // Map it to the range of the analog out (PWM):
  outputValue = map(sensorValue, 0, 1023, 0, 255);
  // Change the analog out value:
  analogWrite(analogOutPin, outputValue);

  // Print the results to the serial monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
  Serial.print("\t output = ");
  Serial.println(outputValue);

  // Wait 2 milliseconds before the next loop
  // for the analog-to-digital converter to settle
  // after the last reading:
  delay(2);
}

• No Output: Ensure that the power supply is connected correctly and within the specified voltage range. Check for proper input signal connection.
• Distorted Sound: This could be due to overdriving the input or output. Check the input signal level and ensure the output is not exceeding the amplifier's capabilities.
• Hum or Noise: Ensure that the power supply is clean and that bypass capacitors are used. Check for proper grounding and avoid long signal paths.

Q: Can the TA6568 be used with a single supply voltage? A: Yes, the TA6568 can be configured to operate with a single supply voltage, but a virtual ground at mid-supply level is typically needed.

Q: What is the maximum supply voltage for the TA6568? A: The maximum supply voltage is ±15V. Exceeding this voltage can damage the component.

Q: Can the TA6568 drive a speaker directly? A: While the TA6568 can drive low-impedance loads, it may not be powerful enough for all speakers. An additional power amplifier stage may be required for larger speakers.

Q: Is the TA6568 suitable for DC signal amplification? A: Yes, the TA6568 can be used for DC signal amplification, but care must be taken to manage offset voltages and drift.

This documentation provides a comprehensive overview of the TA6568 dual operational amplifier, ensuring users can effectively incorporate it into their audio applications.