Overview
The ADS1251UG4, produced by Texas Instruments, is a precision, wide dynamic range, delta-sigma Analog-to-Digital (A/D) converter. It operates with 24-bit resolution from a single +5V supply, making it suitable for high-resolution measurement applications. The delta-sigma architecture ensures 24 bits of no missing codes performance and achieves an effective resolution of 19 bits with 1.5ppm of rms noise at conversion rates up to 20kHz. This converter is designed for various high-precision applications, including cardiac diagnostics, industrial process control, and portable instrumentation.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits (no missing codes) |
| Effective Resolution | 19 bits up to 20kHz data rate |
| RMS Noise | 1.5ppm |
| Analog Input Type | Differential |
| Input Voltage Range | –4.096V to +4.096V (with respect to –VIN, VREF = +4.096V) |
| Reference Voltage Input | 0.5V to 5V |
| Integral Non-Linearity (INL) | 15ppm (max) |
| Power Consumption | 8mW at 20kHz, 5mW at 10kHz |
| Operating Temperature Range | –40°C to 85°C |
| Package Type | SO-8 |
Key Features
- 24-bit resolution with no missing codes
- 19-bit effective resolution up to 20kHz data rate
- Low noise: 1.5ppm of rms noise
- Differential analog inputs
- External reference input (0.5V to 5V)
- Power-down mode and sync mode
- Low power consumption: 8mW at 20kHz, 5mW at 10kHz
- Flexible 2-wire synchronous serial interface
Applications
- Cardiac diagnostics
- Direct thermocouple interfaces
- Blood analysis
- Infrared pyrometers
- Liquid/gas chromatography
- Precision process control
- Smart transmitters
- Industrial process control
- Weight scales
- Portable instrumentation
Q & A
- What is the resolution of the ADS1251UG4?
The ADS1251UG4 has a 24-bit resolution with no missing codes.
- What is the effective resolution of the ADS1251UG4 at 20kHz data rate?
The effective resolution is 19 bits at 20kHz data rate.
- What is the RMS noise of the ADS1251UG4?
The RMS noise is 1.5ppm.
- What type of analog inputs does the ADS1251UG4 have?
The ADS1251UG4 has differential analog inputs.
- What is the input voltage range of the ADS1251UG4?
The input voltage range is –4.096V to +4.096V with respect to –VIN when VREF = +4.096V.
- What is the power consumption of the ADS1251UG4 at 20kHz and 10kHz data rates?
The power consumption is 8mW at 20kHz and 5mW at 10kHz.
- What are the operating temperature ranges for the ADS1251UG4?
The operating temperature range is –40°C to 85°C.
- In what package type is the ADS1251UG4 available?
The ADS1251UG4 is available in an SO-8 package.
- What are some common applications of the ADS1251UG4?
Common applications include cardiac diagnostics, direct thermocouple interfaces, blood analysis, infrared pyrometers, liquid/gas chromatography, and precision process control.
- Does the ADS1251UG4 support power-down and sync modes?
