Overview
The ADS7138-Q1 is an 8-channel, 12-bit, successive approximation register (SAR) analog-to-digital converter (ADC) produced by Texas Instruments. This device is designed for automotive applications and is AEC-Q100 qualified, ensuring reliability over a wide temperature range of –40°C to +125°C. The ADS7138-Q1 features an internal oscillator for ADC conversion processes and communicates via an I2C-compatible interface, supporting both autonomous and single-shot conversion modes. It also includes an analog watchdog function with event-triggered interrupts and a built-in cyclic redundancy check (CRC) for data integrity.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | - |
| Resolution | 12 bits | - |
| Sampling Rate | Up to 140 kSPS | - |
| Package Type | WQFN (16 pins) | - |
| Package Size | 3-mm × 3-mm | - |
| Analog Supply Voltage (AVDD) | 2.35 V to 5.5 V | V |
| Digital Supply Voltage (DVDD) | 1.65 V to 5.5 V | V |
| Operating Temperature Range | –40°C to +125°C | °C |
| I2C Interface Speed | Up to 3.4 MHz (high-speed mode) | - |
| CRC | CRC on data read/write and power-up configuration | - |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1: –40°C to +125°C.
- Small package size: 3-mm × 3-mm WQFN with wettable flanks for visual inspection of solder joints.
- 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.
- Wide operating ranges for AVDD and DVDD.
- CRC for read/write operations and power-up configuration.
- I2C interface with up to 3.4 MHz (high-speed mode) and 8 configurable I2C addresses.
- Programmable averaging filters and turbo comparator mode with speeds up to 3.2 MSPS.
- Analog watchdog function with event-triggered interrupts per channel using a digital window comparator.
Applications
- Automotive center information displays.
- Automotive cluster displays.
- Camera modules without processing.
- Other automotive and industrial applications requiring high reliability and precision ADCs.
Q & A
- What is the resolution of the ADS7138-Q1 ADC?
The ADS7138-Q1 has a resolution of 12 bits. - What is the maximum sampling rate of the ADS7138-Q1?
The maximum sampling rate is up to 140 kSPS. - What is the operating temperature range of the ADS7138-Q1?
The operating temperature range is –40°C to +125°C. - What type of interface does the ADS7138-Q1 use for communication?
The ADS7138-Q1 communicates via an I2C-compatible interface. - What is the package type and size of the ADS7138-Q1?
The package type is WQFN with 16 pins, and the size is 3-mm × 3-mm. - Does the ADS7138-Q1 have built-in data integrity features?
Yes, it has a built-in cyclic redundancy check (CRC) for data read/write operations and power-up configuration. - Can the channels of the ADS7138-Q1 be configured differently?
Yes, the 8 channels can be independently configured as either analog inputs, digital inputs, or digital outputs. - What is the purpose of the analog watchdog function in the ADS7138-Q1?
The analog watchdog function provides event-triggered interrupts per channel using a digital window comparator with programmable high and low thresholds, hysteresis, and an event counter. - Is the ADS7138-Q1 suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications. - What are some typical applications of the ADS7138-Q1?
Typical applications include automotive center information displays, automotive cluster displays, and camera modules without processing.
