Overview
The ADS1278SHKP, produced by Texas Instruments, is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) designed for high-precision industrial measurements. Based on the single-channel ADS1271, the ADS1278 is part of a family that includes the quad-channel ADS1274 and the octal-channel ADS1278. These devices allow for simultaneous sampling of eight channels with data rates up to 144k samples per second (SPS). They are offered in identical packages, enabling drop-in expandability and are fully specified over the extended industrial temperature range of –40°C to +105°C.
The ADS1278 combines the benefits of industrial delta-sigma ADCs, known for their good drift performance, with the larger usable bandwidths typically found in audio applications. This makes it suitable for both DC and AC measurements with excellent accuracy and low noise.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 | Bits |
| Data Rate | Up to 144k | SPS |
| AC Performance - Bandwidth | 70kHz | |
| AC Performance - SNR (High-Resolution Mode) | 111dB | |
| AC Performance - THD | –108dB | |
| DC Accuracy - Offset Drift | 0.8µV/°C | |
| DC Accuracy - Gain Drift | 1.3ppm/°C | |
| Operating Modes | High-Speed, High-Resolution, Low-Power, Low-Speed | |
| Analog Supply | 5V | |
| Digital Core Supply | 1.8V | |
| I/O Supply | 1.8V to 3.3V | |
| Package | HTQFP-64 PowerPAD™ | |
| Operating Temperature Range | –40°C to +105°C |
Key Features
- Simultaneously measures eight channels.
- Data rates up to 144k samples per second (SPS).
- High-order, chopper-stabilized modulator for low drift and noise.
- Onboard decimation filter to suppress out-of-band noise.
- Usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple.
- Four operating modes: High-Speed, High-Resolution, Low-Power, and Low-Speed.
- Linear phase digital filter.
- SPI™ or Frame-Sync serial interface.
- Low sampling aperture error.
- Modulator output option (digital filter bypass).
Applications
- Vibration and modal analysis.
- Multi-channel data acquisition.
- Acoustics and dynamic strain gauges.
- Pressure sensors.
Q & A
- What is the resolution of the ADS1278?
The ADS1278 has a resolution of 24 bits.
- What are the data rates supported by the ADS1278?
The ADS1278 supports data rates up to 144k samples per second (SPS).
- What is the AC performance bandwidth of the ADS1278?
The AC performance bandwidth of the ADS1278 is 70kHz.
- What are the different operating modes of the ADS1278?
The ADS1278 has four operating modes: High-Speed, High-Resolution, Low-Power, and Low-Speed.
- What is the analog supply voltage for the ADS1278?
The analog supply voltage for the ADS1278 is 5V.
- What is the operating temperature range of the ADS1278?
The operating temperature range of the ADS1278 is –40°C to +105°C.
- What types of interfaces does the ADS1278 support?
The ADS1278 supports SPI™ or Frame-Sync serial interfaces.
- What is the purpose of the onboard decimation filter in the ADS1278?
The onboard decimation filter suppresses modulator and signal out-of-band noise.
- What are some common applications of the ADS1278?
Common applications include vibration and modal analysis, multi-channel data acquisition, acoustics, dynamic strain gauges, and pressure sensors.
- What package type is the ADS1278 available in?
The ADS1278 is available in an HTQFP-64 PowerPAD™ package.
