Overview
The ADS1251U/2K5G4, produced by Texas Instruments, is a precision, wide dynamic range, delta-sigma Analog-to-Digital (A/D) converter. It features 24-bit resolution and operates from a single +5V supply. This converter is designed for high-resolution measurement applications, offering a high effective resolution of 19 bits up to a data rate of 20kHz. The ADS1251U/2K5G4 is particularly suited for applications requiring low noise and high accuracy, such as cardiac diagnostics, industrial process control, and portable instrumentation.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Data Rate | - | 20.8 | - | kHz |
| Resolution | - | 24 Bits | - | - |
| Effective Resolution | - | 19 Bits | - | - |
| Noise | 1.5 | - | 2.5 | ppm of FSR, rms |
| Integral Nonlinearity (INL) | - | - | 15 | ppm of FSR |
| Differential Input Impedance | 210kΩ | - | - | at CLK = 8MHz |
| Operating Temperature | -40 | - | 85 | °C |
| Power Supply Voltage | 4.75 | 5 | 5.25 | VDC |
| Operating Power | 7.5 | 10 | - | mW |
| Power-Down Current | 0.4 | - | 1 | µA |
Key Features
- 24-bit resolution with no missing codes
- 19-bit effective resolution up to 20kHz data rate
- Low noise: 1.5ppm of FSR, rms
- Differential inputs
- Integral Nonlinearity (INL): 15ppm (max)
- External reference input (0.5V to 5V)
- Power-down mode and sync mode
- Low power consumption: 8mW at 20kHz, 5mW at 10kHz
Applications
- Cardiac diagnostics
- Direct thermocouple interfaces
- Blood analysis
- Infrared pyrometers
- Liquid/gas chromatography
- Precision process control
- Smart transmitters
- Weight scales
- Portable instrumentation
Q & A
- What is the resolution of the ADS1251U/2K5G4?
The ADS1251U/2K5G4 has a 24-bit resolution with no missing codes. - What is the effective resolution at 20kHz data rate?
The effective resolution is 19 bits at a data rate of up to 20kHz. - What is the noise level of the ADS1251U/2K5G4?
The noise level is 1.5ppm of full-scale range (FSR), rms. - What type of input does the ADS1251U/2K5G4 have?
The ADS1251U/2K5G4 has differential inputs. - What is the operating temperature range of the ADS1251U/2K5G4?
The operating temperature range is from -40°C to 85°C. - How much power does the ADS1251U/2K5G4 consume at 20kHz?
The power consumption is 8mW at a data rate of 20kHz. - Does the ADS1251U/2K5G4 have a power-down mode?
Yes, the ADS1251U/2K5G4 has a power-down mode. - What is the package type of the ADS1251U/2K5G4?
The package type is SO-8 (8-pin SOIC). - What are some typical applications of the ADS1251U/2K5G4?
Typical applications include cardiac diagnostics, industrial process control, weight scales, chromatography, and portable instrumentation. - How does the serial interface of the ADS1251U/2K5G4 work?
The serial interface is a 2-wire synchronous serial interface where data is clocked out using the SCLK pin in Offset Binary Twos Complement format.
