AD4131-4

RECOMMENDED FOR NEW DESIGNS

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

Analog Devices AD4131-4 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
- 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
Flexible sequencer
Diagnostic functionality
Crosspoint multiplexed inputs
- 4 differential/8 pseudodifferential inputs
5 MHz SPI (3-wire or 4-wire)
Available in 35-ball, 2.7 mm × 3.56 mm WLCSP and 32-lead, 5 mm × 5 mm LFCSP
Temperature range: −40°C to +105°C (WLCSP), −40°C to +125°C (LFCSP)
AD4131-4 LFCSP pin compatible with AD7124-4 LFCSP

Part details & applications

The AD4131-4 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 8 single-ended or 4 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, flexible sequencer, sensor biasing and excitation options, diagnostics, and newly added features to improve the battery-operated lifetime (duty cycling).

The AD4131-4 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 AD4131-4 can be configured to have 4 differential inputs or 8 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 AD4131-4 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.

The following key analog functions are offered on the AD4131-4 to allow simple and effective connection to transducers used for measuring temperature, load, and pressure:

PGA. Due to the programmable gain (from 1 to 128) and the high input impedance with low input current, the PGA allows direct interfacing to transducers with low output amplitudes like resistive bridges, thermocouples, and resistance temperature detectors (RTDs).
The capacitive PGA allows full common-mode input range, giving designers greater margin for widely varyi

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