These cutting-edge devices are designed to meet the stringent demands of modern sensor applications, offering exceptional accuracy and performance in analogue signal processing.
The NA2202, NA2203, and NA2204 are 5V CMOS-based AFE ICs that incorporate a high-gain Programmable Gain Amplifier (PGA) and a 16, 20, or 24-bit Delta-Sigma (ΔΣ) Analog-to-Digital Converter (ADC). This powerful combination delivers outstanding signal accuracy and resolution, making these ICs ideal for a wide range of industrial and consumer applications, including pressure sensors, flowmeters, and thermostats.
These AFE ICs utilise a Programmable Gain Amplifier (PGA) to boost analogue signals from sensors connected to multiple input terminals, enabling signal amplification of up to 512 times using a combination of PGA1 and PGA2. The amplified signals are then converted into digital data by the high-precision ΔΣ-ADC. Following offset and gain calibration, this data is transmitted to a microcontroller (MCU) via SPI communication. A built-in level shifter ensures that digital signals are output at the DVDD level, ensuring compatibility with 5V MCUs.
The devices are capable of handling negative voltage power supplies, allowing them to process signals close to 0V without interference from GND noise. They support up to 4 differential inputs or 8 single-ended inputs and feature two excitation current sources, making them particularly well-suited for applications such as temperature controllers using resistance temperature detectors. The ADC reference voltage can be set using either external or internal reference sources. Additionally, the AFE ICs offer various operating modes, including Normal Mode, Low Power Mode (which reduces conversion speed and current consumption to a quarter of that in Normal Mode), Sleep Mode (where all circuits are off except for bias and REG circuits), and Standby Mode (where all circuits are off, with current consumption reduced to 0.1 μA or less).
These AFE ICs are available in a compact QFN4040-24-NB package, measuring just 4.0 × 4.0 × 0.7 mm, making them ideal for applications where space is limited.
