Support software
ADS7128
Small 8-ch 12-bit analog-to-digital converter (ADC) with I2C interface, GPIOs, CRC and RMS module
Data sheet
ADS7128
- Small package size:
- 3-mm × 3-mm WQFN
- 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
- CRC for read/write operations:
- CRC on data read/write
- CRC on power-up configuration
- I2C interface:
- Up to 3.4 MHz (high-speed mode)
- 8 configurable I2C addresses
- Programmable averaging filters
- Root-mean-square module:
- 16-bit true RMS output
- Programmable RMS time window
- Zero-crossing-detect module:
- ZCD output corresponding to any analog input
- Built-in transient rejection and hysteresis
- Digitally adjustable detection threshold
The ADS7128 is an easy-to-use, 8-channel, multiplexed, 12-bit, 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 ADC conversion processes.
The ADS7128 communicates via an I2C-compatible interface and operates in either autonomous or single-shot conversion mode. The ADS7128 implements 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 ADS7128 has a built-in cyclic redundancy check (CRC) for data read/write operations and the power-up configuration. The ADS7128 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
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View all 6 | Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | ADS7128 Small, 8-Channel, 12-Bit ADC With I2C Interface, GPIOs, and CRC datasheet (Rev. A) | PDF | HTML | 20 May 2020 |
| Application note | A Simple, Java-Based CRC Calculator | PDF | HTML | 04 Mar 2026 | |
| 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.
Evaluation board
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RTE) | 16 | Ultra Librarian |
Ordering & quality
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