Analog Devices Inc. AD4129-4BCPZ-RL7

Overview

AD4129-4BCPZ-RL7 from Analog Devices is an ultra-low-power, 16-bit sigma-delta ADC with integrated PGA, FIFO, and sensor biasing circuitry. It delivers 25 nV rms noise at 1.17 SPS (gain = 128), operates from 1.71 V to 3.6 V single supply, supports 4 differential or 8 pseudodifferential inputs, and targets battery-powered precision measurement in smart transmitters and wearables.

For engineers reviewing the AD4129-4BCPZ-RL7 datasheet, AD4129-4BCPZ-RL7 pinout, AD4129-4BCPZ-RL7 application, or AD4129-4BCPZ-RL7 equivalent, key selection criteria include its 32 µA continuous-conversion current, 256-deep FIFO for host offload, duty-cycling support (1/4 or 1/16 ratio), matched excitation currents for RTDs, and low-side power switch for bridge sensors.

Technical Context

The AD4129-4BCPZ-RL7 integrates a crosspoint multiplexer enabling any input pair to route to the PGA and ADC core, supporting flexible channel sequencing across up to 16 preconfigured channels. Its smart sequencer autonomously manages gain, filter type, ODR, and reference source per channel without host intervention.

It features simultaneous 50 Hz/60 Hz rejection via selectable sinc3/sinc4 + post filters, internal 2.5 V/1.25 V band gap reference with 15 ppm/°C drift, and diagnostics including burnout current-based open-wire detection, reference/AIN overvoltage monitoring, and CRC-protected SPI communication.

Key Specifications

Pinout & Package

AD4129-4BCPZ-RL7 is housed in a 32-lead, 5 mm × 5 mm LFCSP package with exposed pad. Pin functions are defined per the Analog Devices AD4129-4 datasheet Rev. A, Section "Pin Configuration and Function Descriptions" (Page 18).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision ADC applications.

Compared with AD7124-4BCPZ-RL7 and ADS1220IPWR, AD4129-4BCPZ-RL7 uniquely combines sub-35 µA operation, embedded FIFO, sequencer-driven multi-sensor management, and full sensor biasing-enabling complete autonomous analog acquisition in space- and power-constrained nodes.

Availability

AD4129-4BCPZ-RL7 is available at Aetrix Electronics and suitable for smart transmitters, wireless sensor nodes, and portable instrumentation requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.

Supply support for AD4129-4BCPZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD4129 family was designed specifically for ultra-low-power, high-accuracy sensor measurement in battery- and energy-harvesting–powered systems-integrating PGA, FIFO, diagnostics, and sensor excitation into a single compact IC.

FAQ

What is the minimum supply voltage required for AD4129-4BCPZ-RL7 to operate correctly?

The AD4129-4BCPZ-RL7 operates from a single analog supply as low as 1.71 V, enabling continued functionality even as coin-cell batteries discharge below 2.0 V. This extends usable battery life significantly compared to devices requiring ≥2.7 V, and is validated across the full −40°C to +125°C temperature range in the LFCSP package.

Does AD4129-4BCPZ-RL7 support simultaneous 50 Hz and 60 Hz line frequency rejection?

Yes, AD4129-4BCPZ-RL7 supports simultaneous 50 Hz and 60 Hz rejection using selectable filter configurations-including sinc3 + REJ60 and post-filter modes-achieving ≥115 dB rejection at both frequencies. This capability is confirmed in Table 6 of the Rev. A datasheet and eliminates need for external notch filters in AC-mains–noisy environments.

How does the FIFO in AD4129-4BCPZ-RL7 reduce system power consumption?

The 256-deep FIFO in AD4129-4BCPZ-RL7 allows the host microcontroller to remain in deep sleep until the FIFO reaches a user-defined threshold, minimizing wake-up frequency. Combined with the smart sequencer, this reduces average system current by offloading timing-critical acquisition tasks from the MCU-directly enabling multi-year battery life in wireless sensor nodes.

Can AD4129-4BCPZ-RL7 directly interface with 4-wire RTDs without external components?

Yes, AD4129-4BCPZ-RL7 integrates two matched excitation current sources (IEXC0/IEXC1) with 100 nA–200 µA programmable output and ±0.5% matching, plus dedicated return paths and open-wire detection. This enables direct 4-wire RTD connection with ratiometric accuracy-no external current sources, switches, or diagnostic circuitry required.

Is AD4129-4BCPZ-RL7 pin-compatible with any other Analog Devices ADCs?

Yes, AD4129-4BCPZ-RL7 in the 32-lead LFCSP package is pin-compatible with AD7124-4BCPZ-RL7, allowing drop-in replacement in existing layouts where higher current budget or wider supply range is acceptable. This compatibility is explicitly stated in the AD4129-4 datasheet Rev. A, page 1.