Overview
The ADS1278-HT from Texas Instruments is a high-performance, 24-bit, delta-sigma analog-to-digital converter (ADC) designed for industrial and high-precision measurement applications. This octal-channel ADC offers simultaneous sampling of all eight channels, making it ideal for applications requiring high accuracy and reliability. The ADS1278-HT is available in various package options, including an 84-pin HFQ package and a KGD chiptray option, ensuring flexibility in design and implementation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 24 bits | |||
| Data Rate (High-Speed mode) | 128,000 | SPS | ||
| Data Rate (High-Resolution mode) | 52,734 | SPS | ||
| Data Rate (Low-Power mode) | 52,734 | SPS | ||
| Data Rate (Low-Speed mode) | 10,547 | SPS | ||
| Integral Nonlinearity (INL) | ±0.0003 | ±0.0012 | % FSR | |
| Offset Error | 0.25 | 2 | mV | |
| Offset Drift | 0.8 | μV/°C | ||
| Gain Error | 0.1 | 0.5 | % FSR | |
| Gain Drift | 1.3 | ppm/°C | ||
| Analog Supply (AVDD) | 4.75 | 5 | 5.25 | V |
| Digital Core Supply (DVDD) | 1.65 | 1.8 | 1.95 | V |
| I/O Supply (IOVDD) | 1.65 | 3.6 | V | |
| Master Clock Rate (fCLK) | 27 | 37 | MHz | |
Key Features
- Simultaneous Sampling: The ADS1278-HT allows simultaneous sampling of all eight channels, ensuring accurate and synchronized data acquisition.
- High Resolution: With a 24-bit resolution, this ADC provides high precision and accuracy in measurement applications.
- Multiple Operating Modes: Supports High-Speed, High-Resolution, Low-Power, and Low-Speed modes to cater to various application requirements.
- Linear Phase Digital Filter: Offers a linear phase digital filter, which is beneficial for applications requiring precise signal processing.
- Low Sampling Aperture Error: Minimizes errors in sampling, ensuring high fidelity in the converted digital signal.
- Modulator Output Option: Allows for digital filter bypass, providing flexibility in signal processing.
- SPI™ or Frame-Sync Serial Interface: Supports both SPI and Frame-Sync protocols for data communication.
- Power Management: Includes power-down control for individual channels, helping in power conservation.
Applications
- Industrial Automation: Suitable for high-precision measurement and control in industrial environments.
- Medical Devices: Can be used in medical equipment requiring high accuracy and reliability in signal conversion.
- Aerospace and Defense: Applicable in various aerospace and defense applications where high precision and robustness are critical.
- Test and Measurement: Ideal for test and measurement equipment that demand high resolution and accuracy.
- Audio Applications: Can be used in high-end audio equipment where large usable bandwidths and excellent ac specifications are necessary.
Q & A
- What is the resolution of the ADS1278-HT ADC?
The ADS1278-HT has a 24-bit resolution.
- What are the different operating modes of the ADS1278-HT?
The ADS1278-HT supports High-Speed, High-Resolution, Low-Power, and Low-Speed modes.
- What is the maximum data rate of the ADS1278-HT in High-Speed mode?
The maximum data rate in High-Speed mode is 128,000 samples per second (SPS).
- What is the typical power consumption of the ADS1278-HT in High-Speed mode?
The typical power consumption in High-Speed mode is around 97-145 mA for AVDD, 1-50 μA for DVDD, and 1-11 μA for IOVDD.
- Does the ADS1278-HT support simultaneous sampling of all channels?
Yes, the ADS1278-HT allows simultaneous sampling of all eight channels.
- What are the voltage ranges for the analog supply (AVDD), digital core supply (DVDD), and I/O supply (IOVDD)?
The voltage ranges are: AVDD (4.75V to 5.25V), DVDD (1.65V to 1.95V), and IOVDD (1.65V to 3.6V).
- What types of serial interfaces does the ADS1278-HT support?
The ADS1278-HT supports both SPI and Frame-Sync serial interfaces.
- How does the ADS1278-HT manage power for individual channels?
The ADS1278-HT includes power-down control for individual channels, helping in power conservation.
- What is the typical offset drift of the ADS1278-HT?
The typical offset drift is 0.8 μV/°C.
- What is the common-mode rejection ratio (CMRR) of the ADS1278-HT?
The CMRR is typically 90-108 dB at 60Hz.
