Radial Lead Inductors # Technical Documentation: 17104 Precision Voltage Reference
Manufacturer : LINEAR TECHNOLOGY (now part of Analog Devices)
Component Type : Precision Voltage Reference IC
## Application Scenarios
### Typical Use Cases
The 17104 precision voltage reference is primarily employed in applications requiring stable, accurate reference voltages with minimal drift and noise. Key use cases include:
- High-Precision Data Acquisition Systems : Serving as reference for 16-24 bit analog-to-digital converters in measurement equipment
- Laboratory Instrumentation : Providing stable references for digital multimeters, oscilloscopes, and spectrum analyzers
- Medical Diagnostic Equipment : Ensuring accuracy in patient monitoring systems and diagnostic imaging devices
- Industrial Process Control : Maintaining precision in temperature controllers, pressure sensors, and flow meters
- Communication Systems : Supporting high-resolution digital-to-analog converters in base stations and RF equipment
### Industry Applications
- Aerospace & Defense : Avionics systems, radar equipment, and military communications where temperature stability is critical
- Automotive Electronics : Advanced driver assistance systems (ADAS) and engine control units requiring reliable voltage references
- Telecommunications : 5G infrastructure equipment and optical network units
- Energy Management : Smart grid systems and renewable energy monitoring
- Test & Measurement : Calibration equipment and precision laboratory instruments
### Practical Advantages and Limitations
Advantages:
- Exceptional long-term stability (typically <20 ppm/√kHr)
- Low temperature coefficient (0.5 ppm/°C maximum)
- Excellent line regulation (2 ppm/V typical)
- Low noise performance (1.5 μVp-p, 0.1-10 Hz)
- Wide operating temperature range (-40°C to +125°C)
Limitations:
- Higher power consumption compared to bandgap references
- Requires careful thermal management in high-temperature environments
- Sensitive to PCB layout and decoupling practices
- Higher cost than basic voltage references
## Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Decoupling
- Problem : Insufficient decoupling leads to noise and instability
- Solution : Use 10 μF tantalum capacitor in parallel with 0.1 μF ceramic capacitor placed close to VIN and GND pins
Pitfall 2: Thermal Management Issues
- Problem : Self-heating causes temperature drift and accuracy degradation
- Solution : Implement proper thermal vias, consider heat sinking, and maintain adequate airflow
Pitfall 3: Load Regulation Problems
- Problem : Dynamic load currents affecting reference stability
- Solution : Use buffer amplifier for high-current applications and implement proper load isolation
Pitfall 4: Ground Loop Interference
- Problem : Shared ground paths introducing noise
- Solution : Implement star grounding and separate analog/digital grounds
### Compatibility Issues with Other Components
ADC/DAC Interfaces:
- Compatible with most high-resolution converters (16-bit and above)
- Ensure reference voltage matches ADC full-scale input range
- Watch for reference input impedance compatibility with driving capability
Amplifier Circuits:
- Works well with precision op-amps having low offset voltage and drift
- Avoid using with amplifiers having high input bias currents
- Consider buffer amplifier for driving multiple loads
Power Supply Requirements:
- Requires clean, well-regulated supply voltage
- Incompatible with switching regulators without proper filtering
- Ensure supply voltage exceeds reference voltage by minimum headroom specification
### PCB Layout Recommendations
Power Supply Routing:
- Use separate power planes for analog and digital sections
- Implement star-point grounding near the reference IC
- Route power traces with adequate width (minimum 20 mil)
Component Placement:
- Place decoupling capacitors within 5 mm of VIN and GND pins
- Position the reference IC away from
