Overview
The ADS7924IRTER from Texas Instruments is a 12-bit, four-channel, analog-to-digital converter (ADC) designed for low-power and high-precision data acquisition. This device features an I2C serial interface and is optimized for power-critical applications such as battery-powered equipment and energy harvesting systems. The ADS7924IRTER includes a four-channel input multiplexer, a successive-approximation-register (SAR) ADC, and onboard programmable digital threshold comparators for each input channel. It supports auto-sequencing of the multiplexer and has a flexible measurement sequencer that minimizes power consumption between conversions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Analog Supply Voltage (AVDD) | 2.2 | 5.5 | V | |
| Digital Supply Voltage (DVDD) | 1.65 | 5.5 | V | |
| Resolution | 12 | Bits | ||
| Integral Linearity | -1.5 | ±0.5 | 1.5 | LSBs |
| Differential Linearity | -1 | ±0.6 | 1.5 | LSBs |
| Offset Error | -5 | 5 | LSBs | |
| Gain Error | -0.2% | -0.01% | 0.2% | |
| Power-Down Current | <1 | µA | ||
| Operating Temperature Range | -40 | 85 | °C | |
| Package | 16-WQFN (3x3 mm) |
Key Features
- Low-Power Operation: MicroPOWER™ monitoring with less than 1 µA of power-down current.
- Four-Channel Multiplexer: Auto-sequencing of the multiplexer with individual alarm thresholds for each channel.
- Programmable Scan Rate: Flexible measurement sequencer to support various measurement needs.
- Programmable Interrupt Pin: Controls shutdown/wakeup of the microcontroller and generates interrupts for alarm conditions.
- Auto Power-Down Control: PWRCON pin allows shutdown of external operational amplifiers.
- Wide Supply Range: Analog supply from 2.2 V to 5.5 V and digital supply from 1.65 V to 5.5 V.
- Small Footprint: 3-mm × 3-mm WQFN package.
- Onboard Oscillator: Eliminates the need for an external master clock.
- Digital Threshold Comparators: Programmable upper and lower limits for each input channel with alarm interrupts.
Applications
- Portable and Battery-Powered Systems: Medical devices, communications equipment, remote sensor signal monitoring, and power-supply monitoring.
- Energy Harvesting Systems: Ideal for applications where power efficiency is critical.
Q & A
- What is the resolution of the ADS7924IRTER ADC?
The ADS7924IRTER has a 12-bit resolution.
- What is the operating temperature range of the ADS7924IRTER?
The operating temperature range is from -40°C to 85°C.
- How many input channels does the ADS7924IRTER have?
The ADS7924IRTER has four input channels.
- What is the power-down current of the ADS7924IRTER?
The power-down current is less than 1 µA.
- Does the ADS7924IRTER have an onboard oscillator?
Yes, the ADS7924IRTER uses an internal clock and does not require an external master clock.
- What is the purpose of the PWRCON pin?
The PWRCON pin allows the user to synchronize the shutdown/wakeup of an external operational amplifier with the ADC conversion cycle.
- Can the ADS7924IRTER generate interrupts for alarm conditions?
Yes, the ADS7924IRTER can generate interrupts when an alarm condition occurs.
- What is the package type and size of the ADS7924IRTER?
The ADS7924IRTER is offered in a 16-WQFN package with a size of 3-mm × 3-mm.
- Does the ADS7924IRTER support I2C communication?
Yes, the ADS7924IRTER supports I2C serial interface with both standard and fast mode formats.
- What are some typical applications of the ADS7924IRTER?
Typical applications include portable and battery-powered systems, medical devices, communications equipment, and energy harvesting systems.
