Overview
The ADS7142-Q1, produced by Texas Instruments, is a 12-bit, 140-kSPS successive-approximation register (SAR) analog-to-digital converter (ADC) designed for high-performance and low-power applications. This device is particularly suited for autonomous signal monitoring, optimizing system power, reliability, and performance. It features a dual-channel analog multiplexer in front of the SAR ADC, followed by an internal data buffer, enabling efficient conversion and capture of data from sensors. The ADS7142-Q1 is AEC-Q100 qualified for automotive applications, with a temperature range of –40°C to +125°C, and is functional safety-capable, making it ideal for critical systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits |
| Sampling Rate | 140 | kSPS | ||
| Conversion Time | 1.8 | µs | ||
| Acquisition Time | 18 | TSCL | ||
| Analog Supply Voltage | 1.65 | 3.6 | V | |
| Digital Supply Voltage | 1.65 | 3.6 | V | |
| Operating Temperature | –40 | 125 | °C | |
| Power Consumption (Autonomous Mode) | 900 | nW | ||
| Package Size | 3 mm × 2 mm |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1: –40°C to +125°C.
- Functional Safety-Capable with documentation available to aid in functional safety system design.
- Small package size: 3 mm × 2 mm.
- 12-bit noise-free resolution.
- Up to 140-kSPS sampling rate.
- Efficient host sleep and wake-up with autonomous monitoring at 900 nW and a windowed comparator for event-triggered host wake-up.
- Independent configuration and calibration with dual-channel, pseudo-differential, or ground-sense input configuration and programmable thresholds for calibration.
- Internal calibration improves offset and drift.
- False trigger prevention with programmable thresholds per channel, programmable hysteresis for noise immunity, and an event counter for transient rejection.
- I2C interface compatible from 1.65 V to 3.6 V with 8 configurable addresses and up to 3.4 MHz (high speed).
Applications
- General-purpose voltage, current, and temperature monitoring in automotive systems such as digital cockpit processing units, driver monitoring, automotive head units, and automotive camera modules.
- Preventive maintenance for elevators, escalators, HVAC, and industrial equipment.
- Wearable electronics.
- Zero cross detection for fault indicators.
- Supervisory functions.
- Sensors for deep learning and artificial intelligence applications.
Q & A
- What is the resolution of the ADS7142-Q1 ADC?
The ADS7142-Q1 has a 12-bit resolution.
- What is the maximum sampling rate of the ADS7142-Q1?
The maximum sampling rate is up to 140 kSPS.
- What is the power consumption in autonomous mode?
The power consumption in autonomous mode is 900 nW.
- What are the operating temperature ranges for the ADS7142-Q1?
The operating temperature range is from –40°C to +125°C.
- Is the ADS7142-Q1 qualified for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications.
- What types of input configurations are supported by the ADS7142-Q1?
The device supports dual-channel, pseudo-differential, or ground-sense input configurations.
- How does the ADS7142-Q1 prevent false triggers?
It uses programmable thresholds per channel, programmable hysteresis for noise immunity, and an event counter for transient rejection.
- What is the package size of the ADS7142-Q1?
The package size is 3 mm × 2 mm.
- What is the I2C interface compatibility range for the ADS7142-Q1?
The I2C interface is compatible from 1.65 V to 3.6 V with up to 3.4 MHz (high speed).
- What are some of the key applications of the ADS7142-Q1?
Key applications include general-purpose monitoring in automotive systems, preventive maintenance, wearable electronics, and supervisory functions.
