Nisshinbo Micro Devices NA2204

The NA2204 is a 5V CMOS-based AFE ICs that integrate a high-gain Programmable Gain Amplifier (PGA) and a 24-bit Delta-Sigma (ΔΣ) Analog-to-Digital Converter (ADC). This combination ensures exceptional signal accuracy and resolution, making it an ideal choice for various industrial and consumer applications, including pressure sensors, flow meters, thermostats and more. The AFE IC utilize a Programmable Gain Amplifier (PGA) to enhance analogue signals from sensors connected to multiple input terminals, allowing signal amplification up to 512 times through a combination of PGA1 and PGA2. These amplified signals are then converted to digital data by a high-precision 24-bit ΔΣ-ADC and, after processing for offset and gain calibration, transmitted to a microcontroller (MCU) via SPI communication. A built-in level shifter ensures the digital signals are output at the DVDD level, compatible with a 5V MCU. These devices can handle negative voltage power supplies, enabling the input of signals near 0V without GND noise interference. They support up to 4 differential inputs or 8 single-ended inputs and feature two excitation current sources, making them suitable for applications like temperature controllers with resistance temperature detectors. The ADC reference voltage can be configured using either external or internal reference sources. The AFE IC offer multiple operating modes: Normal Mode, Low-Power Mode (with conversion speed and current consumption reduced to a quarter of Normal Mode), Sleep Mode (where all circuits are off except bias and REG circuits), and Standby Mode (with all circuits off and current consumption of 0.1 μA or less).

Key features

• Supply voltage: Analog +2.7 to +5.5 V (unipolar) or ±2.5 V (bipolar) Digital +2.7 to +5.5 V
• Ambient operating temperature: -40 °C to 125 °C
• ADC resolution NA2204: 24-bit
• Data rate: 3.125 k to 9.6 ksps
• Input mode: Differential: 4 inputs, Single-ended: 8 inputs Pseudo-differential
• PGA: 1 V/V to 128 V/V
• System calibration for offset & gain drift
• Built-in regulator: 2.048 V ±20 mV
• Built-In oscillator: 1.2288 MHz ±3%
• 50 Hz/60 Hz rejection mode
• Current consumption: Analog 2.9 mA (Normal), Low Power Mode 0.9 mA, Digital 0.26 mA
• Conversion mode Single / Continuous
• Excitation current source: 2 systems (0.1, 0.25, 0.5, 1.0 mA)
• Communication Interface: SPI
• Package NA2202NB: QFN4040-24-NB

Applications

• Temperature controller
• Pressure sensor
• Flowmeter
• PLC
• Digital panel meter