- support@husseinkey.com
- livechat
Analog Devices Inc. AD4129-8 16-Bit Sigma-Delta Analog-to-Digital Converter (ADC) is an ultra-low power high-precision measurement solution for low bandwidth battery-operated applications. The fully integrated analog front end (AFE) includes a multiplexer for up to 16 single-ended or eight differential inputs, a programmable gain amplifier (PGA), and 16-bit sigma-delta (Σ-Δ) ADC, on-chip reference and oscillator. The device also includes selectable filter options, a smart sequencer, sensor biasing, excitation options, diagnostics, and a first in, first out (FIFO) buffer and duty cycling.
The AD4129-8 allows for the measurement of low-frequency signals with a current consumption of 28.5μA (gain = 1) and 32.5μA (gain = 128) while continuously converting and even lower average currents when using one of the duty cycling options. Configure the AD4129-8 to have eight differential inputs or 16 single-ended or pseudo-differential inputs, which connect to a crosspoint multiplexer, where any input pair can become a measurement channel input to the PGA and ADC.
The Analog Devices Inc. AD4129-8 is designed to operate from a single analog supply voltage from 1.71V to 3.6V. In battery applications, operation as low as 1.71V can extend the system’s lifetime as the AFE can continue its operation, even as the battery voltage dissipates. The digital supply can be separate and range from 1.65V to 3.6V. With the reduced current consumption, integrate an on-chip FIFO buffer with the smart sequencer to enable the AD4129-8 to become an autonomous measurement system, allowing the microcontroller to sleep for extended periods.
Intelligent interrupt functionality gives greater confidence in error detection and safety. Enable an interrupt signal to trigger when the samples in the FIFO reach a predefined value or when a user-programmable threshold is exceeded. High levels of integrated front-end functionality coupled with small package options allow smaller-end solutions. For example, the AD4129-8 integrates a low thermal drift band gap reference and accepts an external differential reference, which can be internally buffered.
In safety-critical applications, the AD4129-8 includes diagnostic functions such as open wire detection through burnout currents, internal temperature sensors, reference detection, and analog input overvoltage and undervoltage detection. The digital interface has added diagnostics like cyclic redundancy checks (CRC) and serial interface checks for a robust communication link.
