16-Bit ADC with Integrated MUX, Oscillator, and Reference 10-X2QFN -40 to 125# ADS1113IRUGR Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The ADS1113IRUGR is a precision 16-bit analog-to-digital converter (ADC) designed for low-power measurement applications requiring high accuracy. Typical use cases include:
Sensor Interface Applications
- Temperature Monitoring : Direct interface with thermocouples, RTDs, and thermistors
- Pressure Sensing : Bridge sensor measurements for industrial pressure transducers
- Current Sensing : Shunt resistor measurements with common-mode voltage rejection
- Battery Monitoring : Voltage and current measurements in portable devices
Industrial Control Systems
- Process control instrumentation
- Factory automation sensors
- Motor control feedback systems
- Power quality monitoring
### Industry Applications
- Consumer Electronics : Smartphone battery management, wearable health monitors
- Industrial Automation : PLC analog input modules, process transmitters
- Medical Devices : Portable medical instrumentation, patient monitoring systems
- Automotive : Battery management systems, sensor interfaces
- IoT Devices : Environmental sensors, smart agriculture monitoring
### Practical Advantages and Limitations
Advantages:
- High Resolution : 16-bit ADC provides excellent measurement precision
- Low Power Consumption : Continuous conversion mode draws only 150µA, power-down mode reduces to 0.5µA
- Small Form Factor : WQFN-10 package (1.8mm × 1.5mm) saves board space
- Wide Supply Range : Operates from 2.0V to 5.5V, compatible with various system voltages
- Integrated Features : Programmable gain amplifier (PGA) and voltage reference
Limitations:
- Single-Channel : Only one differential input channel (ADS1114/ADS1115 offer more channels)
- Moderate Speed : Maximum 860 SPS may be insufficient for high-speed applications
- No Internal Temperature Sensor : Requires external components for temperature compensation
- Limited Input Range : ±6.144V maximum differential input voltage
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Power Supply Decoupling
- Pitfall : Inadequate decoupling causing noise and accuracy degradation
- Solution : Use 1µF ceramic capacitor close to AVDD pin and 0.1µF ceramic capacitor at DVDD pin
Input Signal Conditioning
- Pitfall : Unfiltered input signals leading to aliasing and measurement errors
- Solution : Implement RC low-pass filter with cutoff frequency below Nyquist rate
- Recommended : 100Ω series resistor with 0.1µF capacitor to GND
Grounding Issues
- Pitfall : Mixed analog and digital grounds causing noise coupling
- Solution : Use star grounding point, separate analog and digital ground planes
### Compatibility Issues with Other Components
Microcontroller Interface
- I²C Compatibility : Standard I²C interface (100kHz/400kHz/3.4MHz) compatible with most microcontrollers
- Voltage Level Matching : Ensure I²C pull-up voltages match the device's supply voltage
- Address Conflict : Fixed I²C address (1001000) may conflict with other devices on bus
Sensor Compatibility
- Differential Sensors : Optimized for bridge sensors, thermocouples, and other differential outputs
- Single-Ended Sensors : Can be used with proper biasing and reference configuration
- High-Impedance Sources : Input impedance >10MΩ suitable for most sensor types
### PCB Layout Recommendations
Component Placement
- Place decoupling capacitors within 2mm of power pins
- Position the ADC close to the sensor interface to minimize noise pickup
- Keep analog input traces as short as possible
Routing Guidelines
- Analog Signals : Use guarded traces for
