NAU7802KGI

Product Summary

The Nuvoton nau7802kgi is a precision low-power 24-bit analog-to-digital converter (ADC), with an onboard low-noise programmable gain amplifier (PGA), onboard RC or Crystal oscillator, and a precision 24-bit sigma-delta (Σ-Δ) analog to digital converter (ADC). The nau7802kgi device is capable of up to 23-bit ENOB (Effective Number Of Bits) performance. This device provides a complete frontend solution for bridge/sensor measurement such as in weigh scales, strain gauges, and many other high resolution, low sample rate applications. The many built-in features enable high performance applications with very low external parts count. Additionally, both operating current and standby current are very low, and many power management features are included. These enable powering only those elements of the chip that are needed, and also, to operate at greatly reduced power if the full 23-bit ENOB performance is not required. The Programmable Gain Amplifier (PGA) provides selectable gains from 1 to 128. The A/D conversion is performed with a Sigma-Delta modulator and programmable FIR filter that provides a simultaneous 50Hz and 60Hz notch filter to effectively improve interference immunity. Also, this device provides a standard 2-wire interface compatible with I2C protocol for simple and straightforward connection to and interoperation with a wide range of possible host processors.The nau7802kgi can be used in weigh scales, strain gauge, industrial process control, liquid/gas flow control, pressure sensors, and voltage monitors.

Parametrics

nau7802kgi absolute maximum ratings: (1)DC power supply: -0.3 +6.0V; (2)analog input voltage: -0.3 to AVDD + 0.3 V; (3)digital input voltage: -0.3 to DVDD + 0.3 V; (4)operating temperature: -40 to +85°C; (5)storage temperature: -55 to +150°C.

Features

nau7802kgi features: (1)Supply power: 2.7V~5.5V; (2)On-chip VDDA regulator for internal analog circuit or external load cell; (3)23 bits effective precision analog-to-digital converter; (4)Simultaneous 50Hz and 60Hz rejection (reaching －90dB）; (5)RMS Noise; (6)Programmable PGA gains from 1 to 128; (7)Programmable ADC data output rates; (8)External differential reference voltage range from 0.1V to 5V; (9)System clock: External crystal oscillator or on-chip RC oscillator (4.9152Mhz); (10)On-chip calibration; (11)On-chip power-on reset circuit; (12)On-chip temperature sensor; (13)Low Power Consumption and Programmable Power Management Options; (14)External 4.9152MHz Crystal oscillator; (15)System clock; (16)MCU control interface: 2-wire interface compatible with I2C protocol; (17)Operating Temperature: -40~85°C.

Diagrams