PSS2416
High-resolution 24-bit sigma-delta ADC with integrated PGA, excellent noise performance for precision measurement
Product Overview
Description
The PSS2416 is a precision 24-bit sigma-delta analog-to-digital converter designed for high-resolution measurement applications.
Featuring an integrated programmable gain amplifier (PGA) and outstanding noise performance, this ADC is ideal for sensor interfaces, weigh scales, and industrial process control.
The device offers multiple output data rates, flexible input multiplexing, and a simple I2C interface for easy integration into embedded systems.
Product Series
PSS
Primary Application
Weigh scales and load cells
Key Features
- 24-bit resolution with no missing codes
- Integrated PGA with gains from 1 to 128
- Excellent noise performance: 40 nVrms
- Low offset and gain drift over temperature
- Multiple output data rates
- 4-channel differential input multiplexer
- I2C interface with up to 400 kHz speed
- Low power consumption: 0.9 mW typical
- Internal or external voltage reference
Specifications
| Resolution | 24 bit |
|---|---|
| Output Data Rate | 5 SPS - 4 kSPS |
| PGA Gain | 1, 2, 4, 8, 16, 32, 64, 128 |
| Input Noise | 40 nVrms @ 1 kSPS, Gain=128 |
| INL | ±15 ppm of FS |
| Offset Drift | 0.05 uV/°C |
| Gain Drift | 0.5 ppm/°C |
| Power Supply | 2.7V - 5.25V |
| Power Consumption | 0.9 mW |
| Interface | I2C |
| Temperature Range | -40°C to +85°C (Industrial), -40°C to +125°C (Automotive) |
| Package | TSSOP-20, QFN-20 |
Applications
Weigh scales and load cells
Electronic system design
Temperature measurement
Data acquisition and conversion
Pressure sensors
Sensor signal conditioning
Industrial process control
Industrial automation and control
Battery monitoring
Battery and charging management
Medical instrumentation
Medical electronics
Strain gauge interfaces
Communication and interface
FAE Expert Insights
"The PSS2416 is my go-to recommendation for precision measurement applications. The integrated PGA with gains up to 128 is a game-changer for sensor interfaces, allowing direct connection to low-level signals without external amplification. I've used this ADC in weigh scale designs where the 24-bit resolution and low noise (40 nVrms) enable accurate measurements down to microvolt levels. The offset drift of only 0.05 uV/°C ensures stable performance across temperature. For best results, I recommend using the internal reference for ratiometric measurements and implementing proper input filtering. The I2C interface makes it easy to integrate with modern microcontrollers."
Integrated PGA with excellent noise performance for sensor interfaces
— Sarah Johnson, BeiLuo
Frequently Asked Questions
What is the effective resolution of the PSS2416 at different PGA gains?
The PSS2416 maintains excellent effective resolution across all PGA gain settings. At gain=1, the effective resolution is approximately 20 bits with 40 nVrms noise. At higher gains, the noise remains constant in input-referred terms, so the effective resolution improves. At gain=128, the device can resolve microvolt-level signals with effective resolution exceeding 22 bits. The integrated PGA eliminates the need for external amplification, reducing component count and improving accuracy by minimizing offset errors from external amplifiers.
Use higher gains for low-level sensor signals. The PGA allows direct connection to load cells and strain gauges without external amplifiers.
How do I calculate the output data rate for my application?
The PSS2416 offers programmable output data rates from 5 SPS to 4 kSPS. Lower data rates provide better noise performance due to increased oversampling ratio. For example, at 5 SPS the noise is approximately 40 nVrms, while at 1 kSPS it increases to about 120 nVrms. The data rate is configured through the I2C interface by setting the appropriate configuration register. Consider your application requirements: weigh scales typically use 10-80 SPS for stability, while temperature monitoring may use 5-20 SPS for lower noise.
Select lower data rates for better noise performance in precision applications. Higher rates are suitable for faster changing signals.
What is the best way to connect a load cell to the PSS2416?
For load cell applications, connect the bridge output directly to the differential inputs of the PSS2416. The integrated PGA provides the necessary gain (typically 64 or 128 for load cells). Use the internal voltage reference in ratiometric configuration by connecting the reference output to the load cell excitation. This configuration eliminates errors from reference voltage variations. Add RC filters (100Ω + 0.1uF) at the inputs to reduce EMI. Place the ADC close to the load cell to minimize noise pickup in the low-level signal lines.
Use ratiometric measurement with internal reference for best accuracy. Our FAE team can provide complete load cell interface reference designs.
How do I minimize temperature drift in precision measurements?
The PSS2416 features excellent temperature stability with offset drift of only 0.05 uV/°C and gain drift of 0.5 ppm/°C. To minimize overall system drift: 1) Use the internal reference which has low temperature coefficient; 2) Implement ratiometric measurement for sensor applications; 3) Maintain consistent PCB temperature across the ADC and sensor; 4) Use low-drift external components if needed; 5) Consider system-level calibration for highest accuracy. These techniques can achieve measurement stability better than 10 ppm/°C in typical applications.
The low intrinsic drift often eliminates need for external compensation. For highest precision, implement system calibration at known temperatures.
What are the key differences between the PSS2416 and competing 24-bit ADCs?
The PSS2416 offers several advantages over competing 24-bit ADCs: 1) Full PGA gain range from 1-128 vs limited options in competitors; 2) Lower power consumption at 0.9 mW vs 2-3 mW typical; 3) Standard I2C interface vs proprietary interfaces; 4) Better offset drift at 0.05 uV/°C; 5) Multiple input channels with internal multiplexer; 6) Competitive pricing with shorter lead times. These features make it ideal for multi-channel sensor systems and battery-powered applications where power and cost are critical.
Choose PSS2416 for multi-channel sensor systems requiring low power and cost-effective solution with standard interface.