Overview
The ADS1242IPWT from Texas Instruments is a high-precision, 24-bit delta-sigma (ΔΣ) analog-to-digital converter (ADC). This device is designed for applications requiring high resolution and low noise, operating from a supply voltage range of 2.7V to 5.25V. The ADS1242 features up to eight multiplexed input channels, a programmable gain amplifier (PGA) with gains from 1 to 128, and an on-chip calibration system. It is particularly suited for industrial process control, smart transmitters, weight scales, liquid/gas chromatography, and portable instrumentation.
Key Specifications
| Parameter | Min | Max | Units | |
|---|---|---|---|---|
| Resolution | 24 bits | - | - | - |
| Integral Nonlinearity (INL) | - | ±0.0015% | - | % of FS |
| Offset Error | - | 7.5 ppm | - | of FS |
| Gain Error | - | - | - | - |
| Programmable Gain Amplifier (PGA) Gains | 1 | - | 128 | - |
| Supply Voltage (VDD) | 2.7V | - | 5.25V | V |
| Power Consumption (PGA=1, Buffer OFF) | 240 µA | - | 375 µA | µA |
| Operating Temperature Range | -40°C | - | 85°C | °C |
| Storage Temperature Range | -60°C | - | 100°C | °C |
Key Features
- 24-bit resolution with no missing codes
- Simultaneous 50Hz and 60Hz rejection (–90dB minimum)
- Programmable gain amplifier (PGA) with gains from 1 to 128
- On-chip calibration and offset correction using an 8-bit DAC
- External differential reference input (0.1V to 5V)
- SPI™ compatible serial interface
- Single-cycle settling digital filter
- Burnout current sources for sensor detection
- Low power consumption (up to 600µW)
Applications
- Industrial process control
- Liquid/gas chromatography
- Blood analysis
- Smart transmitters
- Portable instrumentation
- Weight scales
Q & A
- What is the resolution of the ADS1242?
The ADS1242 has a 24-bit resolution with no missing codes.
- What are the gain ranges of the PGA in the ADS1242?
The PGA in the ADS1242 has user-selectable gain ranges from 1 to 128.
- What is the supply voltage range for the ADS1242?
The supply voltage range for the ADS1242 is from 2.7V to 5.25V.
- Does the ADS1242 support simultaneous 50Hz and 60Hz rejection?
- What is the operating temperature range of the ADS1242?
The operating temperature range of the ADS1242 is from –40°C to +85°C.
- How many input channels does the ADS1242 have?
The ADS1242 has up to eight multiplexed input channels.
- What type of serial interface does the ADS1242 use?
The ADS1242 uses an SPI™ compatible serial interface.
- Does the ADS1242 have on-chip calibration?
- What is the power consumption of the ADS1242?
The power consumption of the ADS1242 can be as low as 600µW.
- What are some typical applications of the ADS1242?
Typical applications include industrial process control, liquid/gas chromatography, smart transmitters, portable instrumentation, and weight scales.
