AD4129-8

RECOMMENDED FOR NEW DESIGNS

32 μA, Ultra-Low Power, 16-Bit Sigma-Delta ADC with Integrated PGA and FIFO

Analog Devices AD4129-8 Product Info

10 February 2026 4

Features

Ultra-low current consumption (typical)
- 32 μA: continuous conversion mode (gain = 128)
- 5 μA: duty cycling mode (ratio = 1/16)
- 0.5 μA: standby mode
- 0.1 μA: power-down mode
Built-in features for system level power savings
- Current saving duty cycle ratio: 1/4 or 1/16
- Smart sequencer and per channel configuration minimizes host processor load
- Deep embedded FIFO minimizes host processor load (depth of 256 samples)
- Autonomous FIFO interrupt functionality, threshold detection
- Single supply as low as 1.71 V increasing battery length
RMS noise: 25 nV rms at 1.17 SPS (gain = 128) = 48 nV/√Hz
Up to 16 noise free bits (gain = 1)
Output data rate: 1.17 SPS to 2.4 kSPS
Operates from 1.71 V to 3.6 V single supply or ±1.8 V split supplies

Band gap reference with 15 ppm/°C maximum drift
PGA with rail-to-rail analog input
Adaptable sensor interfacing functionality
- Matched programmable excitation currents for RTDs
- On-chip bias voltage generator for thermocouples
- Low-side power switch for bridge transducers
- Sensor open-wire detection
Internal temperature sensor and oscillator
Self and system calibration
Flexible filter options
Simultaneous 50 Hz/60 Hz rejection (on selected filter options)
General-purpose outputs
Diagnostic functionality
Crosspoint multiplexed inputs
- 8 differential/16 pseudodifferential inputs
5 MHz SPI (3-wire

Part details & applications

The AD4129-8 is an ultra-low power, high precision, and measurement solution for low bandwidth battery-operated applications. The fully integrated analog front end (AFE) includes a multiplexer for up to eight single-ended or four differential inputs, programmable gain amplifier (PGA), 16-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC), on-chip reference and oscillator, selectable filter options, smart sequencer, sensor biasing and excitation options, diagnostics, and newly added features to improve the battery-operated lifetime (more than five years on a coin cell), that is, a first in, first out (FIFO) buffer and duty cycling.

The AD4129-8 allows users to measure low-frequency signals with a current consumption of 28.5 μA (gain = 1) and 32.5 μA (gain = 128) while continuously converting, and even lower average currents when using one of the duty cycling options. The AD4129-8 can be configured to have four differential inputs or eight single ended or pseudodifferential inputs, which connect to a crosspoint multiplexer, where any input pair can become a measurement channel input to the PGA and ADC.

The AD4129-8 is designed to allow the user to operate from a single analog supply voltage from 1.71 V to 3.6 V. In battery applications, operation as low as 1.71 V can extend the system lifetime as the AFE can continue its operation, even as the battery voltage dissipates. The digital supply can be separate and range from 1.65 V to 3.6 V. Together with the reduced current consumption, the integration of an on-chip FIFO buffer can be used in tandem with the smart sequencer, to enable the AD4129-8 to become an autonomous measurement system, which allows the microcontroller to sleep for extended periods.

Intelligent interrupt functionality gives the user a greater confidence in both error detection and safety. The user can e an interrupt signal to trigger when the samples in the FIFO reach a predefin

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