How to Use AD584 - Pin Programmable Precision Voltage Reference: Examples, Pinouts, and Specs

The AD584 is a precision voltage reference manufactured by Analog Devices (Part ID: AD584JNZ). It provides stable and accurate output voltages that can be programmed using external pins. This component is ideal for applications requiring high accuracy, low temperature drift, and long-term stability. The AD584 is commonly used in analog-to-digital converters (ADCs), digital-to-analog converters (DACs), calibration systems, and precision measurement equipment.

• Analog and digital instrumentation
• Calibration and test equipment
• Precision voltage sources for ADCs and DACs
• High-accuracy measurement systems

• Input Voltage Range: 4.5V to 30V
• Output Voltage Options: 2.5V, 5V, 7.5V, and 10V (programmable via pins)
• Output Current: Up to 10mA
• Initial Accuracy: ±0.14% (typical for AD584JNZ)
• Temperature Coefficient: 25 ppm/°C (typical)
• Output Noise: 100 µV peak-to-peak (0.1 Hz to 10 Hz)
• Operating Temperature Range: 0°C to +70°C (for AD584JNZ)
• Package Type: 8-pin PDIP (Plastic Dual In-line Package)

The AD584 is an 8-pin device. The table below describes each pin:

The output voltage of the AD584 is determined by the connections to the VSET pins (Pins 3 and 8). The table below shows the configuration:

1. Power Supply: Connect a DC voltage source (4.5V to 30V) to the VIN pin (Pin 6). Ensure the input voltage is stable and within the specified range.
2. Ground Connection: Connect the GND pin (Pin 2) to the circuit ground.
3. Output Voltage Selection: Configure the VSET pins (Pins 3 and 8) according to the desired output voltage, as shown in the Voltage Programming Table.
4. Output Connection: Connect the VOUT pin (Pin 1) to the load or circuit requiring the reference voltage. Ensure the load does not exceed the maximum output current of 10mA.

• Use decoupling capacitors (e.g., 0.1µF ceramic capacitor) between VIN and GND to reduce noise and improve stability.
• Avoid exceeding the maximum input voltage (30V) to prevent damage to the device.
• Ensure proper thermal management if operating at higher input voltages or output currents.
• For best accuracy, minimize external noise and temperature variations in the operating environment.

The AD584 can be used as a precision voltage reference for ADC calibration in an Arduino UNO project. Below is an example of how to connect and use the AD584:

• Connect VIN (Pin 6) to the Arduino's 5V pin.
• Connect GND (Pin 2) to the Arduino's GND pin.
• Configure the VSET pins (Pins 3 and 8) for the desired output voltage (e.g., 5V).
• Connect VOUT (Pin 1) to an analog input pin on the Arduino (e.g., A0).

// Example: Reading the AD584 output voltage using Arduino UNO
const int referencePin = A0; // Analog pin connected to AD584 VOUT
float referenceVoltage = 5.0; // Expected output voltage of AD584 (e.g., 5V)

void setup() {
  Serial.begin(9600); // Initialize serial communication
  analogReference(DEFAULT); // Use default 5V reference for ADC
}

void loop() {
  int adcValue = analogRead(referencePin); // Read ADC value from AD584
  float voltage = (adcValue / 1023.0) * referenceVoltage; 
  // Convert ADC value to voltage
  
  Serial.print("Measured Voltage: ");
  Serial.print(voltage, 3); // Print voltage with 3 decimal places
  Serial.println(" V");
  
  delay(1000); // Wait 1 second before next reading
}

• Adjust the referenceVoltage variable in the code if using a different output voltage from the AD584.
• Ensure the Arduino's ADC reference voltage matches the AD584's output voltage for accurate readings.

1. No Output Voltage:

   • Verify the input voltage is within the specified range (4.5V to 30V).
   • Check the connections to the VSET pins to ensure proper configuration.
   • Ensure the load connected to VOUT does not exceed 10mA.

2. Inaccurate Output Voltage:

   • Confirm the input voltage is stable and free from noise.
   • Use decoupling capacitors to reduce noise and improve stability.
   • Verify the temperature of the operating environment is within the specified range (0°C to +70°C for AD584JNZ).

3. Overheating:

   • Check for excessive input voltage or output current.
   • Ensure proper thermal management and ventilation.

• Q: Can the AD584 be used with a 3.3V system?
  A: No, the minimum input voltage for the AD584 is 4.5V. It is not suitable for 3.3V systems.

• Q: What is the maximum load current the AD584 can drive?
  A: The AD584 can drive a maximum load current of 10mA.

• Q: Can I leave the unused pins unconnected?
  A: Yes, the NC (No Connection) pins can be left unconnected. The TEMP pin is also typically left unconnected unless temperature compensation is required.

• Q: How do I improve the accuracy of the AD584?
  A: Use a stable input voltage, minimize noise, and operate the device within the recommended temperature range.

This concludes the documentation for the AD584 - Pin Programmable Precision Voltage Reference.