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ADI ADS1219IRTET 4-Channel 24-Bit Delta-Sigma ADC With I2C Interface And External Vref inputs

Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned distributor of electronic components, has been supplying ADI's high-precision ADC ADS1219IRTET for an extended period. This 4-channel 24-bit Delta-Sigma ADC, with its outstanding performance parameters, flexible I2C interface, and wide voltage range, is an ideal choice for industrial measurement, sensor interfaces, and portable devices.

【ADS1219IRTET Product Overview】

The ADS1219IRTET is a high-precision 24-bit analogue-to-digital converter (ADC) that integrates all the features required for common system monitoring functions, such as power supply voltage, current, and temperature monitoring. The device provides two differential or four single-ended inputs via a flexible input multiplexer (MUX), along with rail-to-rail input buffers, a programmable gain stage, a voltage reference, and an oscillator.

The ADS1219IRTET includes buffers that allow high-impedance sources to be directly connected to the device. The gain stage is located after the buffers and provides selectable gains of 1 and 4. The ADS1219IRTET can convert at data rates up to 1000 samples per second (SPS) within a single cycle settling time. At 20 SPS, the digital filter can simultaneously suppress 50 Hz and 60 Hz noise, making it suitable for noisy industrial applications.

The ADS1219IRTET uses a 2-wire, I2C-compatible interface, supporting I2C bus speeds of up to 1 Mbps. The device can be assigned one of 16 different I2C addresses via two address pins.

The ADS1219IRTET is housed in a lead-free 16-pin WQFN package and operates over a temperature range of –40°C to +125°C.

【ADS1219IRTET Key Features】

Resolution: 24-bit effective resolution, achieving up to 20-bit noise-free resolution at 20 SPS

Sampling Rate: Programmable data rate, up to 1 kSPS (samples per second)

Input Channels: 4 single-ended or 2 differential input configurations, supporting rail-to-rail input buffering

Interface: Standard I2C-compatible interface, supporting standard mode, fast mode, and ultra-fast mode

Power Supply Voltage Range: Wide voltage operating range (2.3V to 5.5V), extremely low power consumption (typical value 315 µA)

Integrated features: Built-in 2.048 V reference voltage (drift only 5 ppm/°C) and 2% accuracy oscillator

The ADS1219IRTET's single-cycle stable digital filter enables it to synchronously suppress 50 Hz and 60 Hz power line interference at 20 SPS, making it particularly suitable for precision measurement applications in industrial environments. The ADS1219IRTET device also offers programmable gain (1x or 4x), further enhancing its small-signal acquisition capabilities.

【Technical Features of the ADS1219IRTET】

1. High-precision Delta-Sigma architecture

The ADS1219IRTET combines Delta-Sigma modulation technology with a digital filter to achieve exceptional noise performance and linearity. Its 24-bit resolution maintains high precision even at the highest sampling rate of 1 kSPS, making it particularly suitable for applications requiring long-term stable measurements, such as temperature monitoring, pressure sensing, and weighing systems.

Key performance metrics:

Integral non-linearity (INL): ±10 ppm (maximum)

Gain error: ±0.1% (maximum when PGA=1)

Noise performance: 20-bit effective resolution at 20 SPS

Common-mode rejection ratio (CMRR): >100 dB (typical)

2. Flexible input configuration and power management

The ADC supports multiple input modes, allowing users to select based on application requirements:

4 single-ended inputs

2 fully differential inputs

Pseudo-differential input configuration

The built-in rail-to-rail input buffer provides high input impedance (>1 GΩ), enabling direct connection to sensors without additional signal conditioning circuits. In terms of power management, the ADS1219IRTET features a wide operating voltage range (2.3V–5.5V) and supports low-power mode, with typical current consumption as low as 315µA, making it an ideal choice for battery-powered portable devices.

3. Integrated Features and Peripheral Interfaces

The ADS1219IRTET integrates multiple practical features, significantly reducing the number of external components:

Internal reference voltage: 2.048 V (±5 ppm/°C drift), or an external reference voltage can be used

Precision oscillator: 2% accuracy, no external clock required

I²C interface: Supports standard mode (100kHz), fast mode (400kHz), and ultra-fast mode (1MHz)

Configurable I²C address: Supports up to 16 different addresses via pin configuration

【Applications of ADS1219IRTET】

1. Industrial Sensor Interface

In the field of industrial automation, ADS1219IRTET is perfectly suited for:

Temperature measurement systems: Connecting RTDs, thermocouples, or thermistors

Pressure/force sensors: Bridge sensor signal acquisition

Process control instruments: 4-20mA current loop reception

Weighing equipment: Strain gauge signal processing

2. Portable Medical Devices

Due to its low-power characteristics, the ADS1219IRTET is highly suitable for:

Portable vital signs monitoring: oxygen saturation, heart rate, and blood pressure measurement

Wearable health devices: continuous physiological parameter acquisition

Medical sensor interfaces: amplification and digitisation of bioelectric signals

3. Consumer Electronics and IoT

In the consumer electronics sector, this ADC can be used for:

Smart home sensors: ambient light, humidity, and gas detection

Touch panels: high-precision touch position detection

Audio equipment: professional-grade audio signal acquisition