How to Use TS3A5018 analog switch: Examples, Pinouts, and Specs

The TS3A5018 is a low-voltage, dual-channel analog switch designed for routing analog signals in a variety of applications. It features low on-resistance (RON) and low power consumption, making it an ideal choice for battery-operated devices. The switch is controlled by a digital signal, allowing seamless integration into digital circuits. Its compact design and high performance make it suitable for applications such as audio signal routing, data acquisition systems, and portable electronics.

• Audio signal switching and routing
• Portable and battery-powered devices
• Data acquisition systems
• Test and measurement equipment
• Multiplexing analog signals in embedded systems

The TS3A5018 is a versatile component with the following key specifications:

The TS3A5018 is available in a 10-pin package. Below is the pinout and description:

1. Power Supply: Connect the VDD pin to a supply voltage between 1.65V and 3.6V. Connect the GND pin to the ground of the circuit.
2. Control Signals: Apply a digital control signal (0V or VDD) to the IN1 and IN2 pins to control the state of the switches:
   • Logic HIGH (VDD): The corresponding switch is closed, connecting COMx to NOx.
   • Logic LOW (0V): The corresponding switch is open, isolating COMx from NOx.
3. Signal Routing: Connect the analog signals to the COMx and NOx pins. Ensure the signal voltage stays within the range of 0V to VDD.
4. Bypass Capacitors: Place a 0.1 µF decoupling capacitor close to the VDD pin to reduce noise and improve stability.

• Signal Voltage Range: Ensure the input signal voltage does not exceed the supply voltage (VDD) to avoid damage.
• Load Impedance: Use a high-impedance load to minimize signal distortion caused by the switch's on-resistance.
• PCB Layout: Keep traces short and minimize parasitic capacitance to maintain signal integrity, especially for high-frequency signals.

The TS3A5018 can be controlled by an Arduino UNO to switch analog signals. Below is an example circuit and code:

• Connect VDD to the Arduino's 3.3V pin and GND to the Arduino's GND.
• Connect IN1 and IN2 to digital pins 7 and 8 of the Arduino, respectively.
• Connect the analog signal to COM1 and NO1 for the first switch.

// Example code to control TS3A5018 analog switch with Arduino UNO

#define SWITCH1_CONTROL 7  // Pin connected to IN1
#define SWITCH2_CONTROL 8  // Pin connected to IN2

void setup() {
  pinMode(SWITCH1_CONTROL, OUTPUT); // Set pin 7 as output
  pinMode(SWITCH2_CONTROL, OUTPUT); // Set pin 8 as output

  // Initialize both switches to OFF state
  digitalWrite(SWITCH1_CONTROL, LOW);
  digitalWrite(SWITCH2_CONTROL, LOW);
}

void loop() {
  // Turn ON switch 1
  digitalWrite(SWITCH1_CONTROL, HIGH);
  delay(1000); // Keep switch 1 ON for 1 second

  // Turn OFF switch 1 and turn ON switch 2
  digitalWrite(SWITCH1_CONTROL, LOW);
  digitalWrite(SWITCH2_CONTROL, HIGH);
  delay(1000); // Keep switch 2 ON for 1 second

  // Turn OFF both switches
  digitalWrite(SWITCH2_CONTROL, LOW);
  delay(1000); // Wait for 1 second before repeating
}

1. Switch Not Responding to Control Signal

   • Cause: Incorrect voltage levels on INx pins.
   • Solution: Ensure the control signal is either 0V (LOW) or VDD (HIGH).

2. Signal Distortion

   • Cause: High load current or long PCB traces.
   • Solution: Use a high-impedance load and minimize trace lengths.

3. Excessive Power Consumption

   • Cause: Floating control pins.
   • Solution: Pull unused control pins to GND or VDD using a resistor.

4. Signal Voltage Exceeds VDD

   • Cause: Input signal is outside the allowable range.
   • Solution: Ensure the signal voltage is within 0V to VDD.

Q1: Can the TS3A5018 handle digital signals?
A1: Yes, the TS3A5018 can route digital signals as long as the voltage levels are within the 0V to VDD range.

Q2: What is the maximum frequency the TS3A5018 can handle?
A2: The TS3A5018 has a bandwidth of 300 MHz, making it suitable for high-frequency signals.

Q3: Can I use the TS3A5018 with a 5V supply?
A3: No, the maximum supply voltage for the TS3A5018 is 3.6V. Using a 5V supply may damage the component.

Q4: How do I reduce noise in my circuit?
A4: Use a 0.1 µF decoupling capacitor near the VDD pin and keep traces short to minimize noise.