ADS7028
Small 8-channel 12-bit analog-to-digital converter (ADC) with SPI, GPIOs and CRC
ADS7028
- Small package size:
- WQFN 3 mm × 3 mm
- 8 channels configurable as any combination of:
- Up to 8 analog inputs, digital inputs, or digital outputs
- GPIOs for I/O expansion:
- Open-drain, push-pull digital outputs
- Analog watchdog:
- Programmable thresholds per channel
- Event counter for transient rejection
- Wide operating ranges:
- AVDD: 2.35 V to 5.5 V
- DVDD: 1.65 V to 5.5 V
- –40°C to +85°C temperature range
- Enhanced-SPI digital interface:
- High-speed, 60-MHz interface
- Achieve full throughput with >13.5-MHz SPI
- CRC for read/write operation:
- CRC on data read/write
- CRC on power-up configuration
- Programmable averaging filters
- Root-mean-square module:
- 16-bit true RMS output
- Programmable RMS time window
- Zero-crossing-detect module:
- ZCD output corresponding to analog input
- Built-in transient rejection and hysteresis
- Digitally adjustable detection threshold
The ADS7028 is an easy-to-use, 8-channel, multiplexed, 12-bit, 1-MSPS, successive approximation register analog-to-digital converter (SAR ADC). The eight channels can be independently configured as either analog inputs, digital inputs, or digital outputs. The device has an internal oscillator for the ADC conversion process.
The ADS7028 communicates through an SPI-compatible interface and operates in either autonomous or single-shot conversion mode. The ADS7028 implements the analog watchdog function by event-triggered interrupts per channel using a digital window comparator with programmable high and low thresholds, hysteresis, and an event counter. The ADS7028 has a built-in cyclic redundancy check (CRC) for data read/write operations and the power-up configuration. The ADS7028 features a root-mean-square (RMS) module that computes a 16-bit true RMS result for any analog input channel. The integrated zero-crossing-detect (ZCD) module allows for transient rejection and hysteresis near the configurable threshold crossings.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | ADS7028 Small, 8-Channel, 12-Bit ADC with SPI Interface, GPIOs, and CRC datasheet (Rev. A) | PDF | HTML | 30 Apr 2020 |
Application brief | ADS7x28 True Root-Mean-Square Module | PDF | HTML | 06 Feb 2023 | |
Application brief | Resolution-Boosting ADS7138 Using Programmable Averaging Filter | 01 Dec 2019 | ||
User guide | BP-ADS7128 BoosterPack™ Plug-In Module User's Guide | 21 May 2019 | ||
Application brief | Zero-Crossing Detection with False Trigger Avoidance | 09 Jan 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
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Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
WQFN (RTE) | 16 | Ultra Librarian |
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