Analog Devices Inc. AD7124-8BCPZ-RL

Overview

AD7124-8BCPZ-RL from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, internal reference, excitation currents, and diagnostics-designed for high-precision sensor measurement. It supports 8 differential or 15 pseudo-differential inputs, operates across −40°C to +125°C, consumes as low as 255 µA in low power mode, and delivers 24 nV rms noise at 1.17 SPS (gain = 128).

For engineers reviewing the AD7124-8BCPZ-RL datasheet, AD7124-8BCPZ-RL pinout, AD7124-8BCPZ-RL application, or AD7124-8BCPZ-RL equivalent, key selection criteria include simultaneous 50/60 Hz rejection at 25 SPS, AEC-Q100 qualification, per-channel configuration flexibility, and integrated diagnostics supporting SIL-certifiable systems.

Technical Context

The AD7124-8BCPZ-RL implements a 24-bit Σ-Δ modulator with programmable gain (1–128), selectable sinc3/sinc4/fast-settling filters, and an on-chip 2.5 V bandgap reference (10 ppm/°C drift for W grade). Its crosspoint multiplexer enables flexible analog input routing, while the automatic channel sequencer supports up to 16 configurable channels-including diagnostics-interleaved with conversions.

It integrates matched excitation current sources (0.1–1000 µA), burnout detection, bias voltage generation (AVDD/2), low-side power switch (RON = 7–10 Ω), and dual LDOs (1.8 V and 1.9 V) for analog/digital supply regulation. Communication uses SPI/QSPI/MICROWIRE-compatible 3-/4-wire serial interface with Schmitt-triggered SCLK and CRC-protected register access.

Key Specifications

Pinout & Package

AD7124-8BCPZ-RL is housed in a 32-lead, 5 mm × 5 mm × 0.75 mm LFCSP package with exposed thermal pad (EP). Pin functions are defined per Analog Devices Rev. F datasheet, with multifunction pins such as DOUT/RDY operating in time-multiplexed mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7124-4BCPZ-RL, the AD7124-8BCPZ-RL provides double the channel density without sacrificing noise performance or diagnostics; versus ADS1263IPBSR, it trades raw bit depth for comprehensive on-chip sensor interface features-reducing total system cost and validation effort in industrial and automotive sensing.

Availability

AD7124-8BCPZ-RL is available at Aetrix Electronics and suitable for temperature measurement, pressure sensing, and industrial process control applications requiring stable component supply, long-term manufacturability, and automotive-grade reliability.

Supply support for AD7124-8BCPZ-RL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD7124 family was engineered specifically for high-accuracy, low-power sensor measurement in harsh environments-targeting automotive, industrial automation, and instrumentation where integration, diagnostics, and long-term stability are mandatory.

FAQ

What power supply configurations does the AD7124-8BCPZ-RL support?

The AD7124-8BCPZ-RL supports flexible power architectures: analog supply AVDD/AVSS can be 2.7–3.6 V single-rail or ±1.8 V dual-rail; digital I/O uses independent IOVDD (1.65–3.6 V). Internal LDOs generate 1.8 V and 1.9 V supplies, enabling clean separation of analog and digital domains. This decoupling minimizes noise coupling and simplifies PCB design for mixed-signal systems.

How does the AD7124-8BCPZ-RL achieve simultaneous 50 Hz and 60 Hz rejection?

The AD7124-8BCPZ-RL achieves simultaneous 50 Hz and 60 Hz rejection through its programmable digital filter architecture-specifically the sinc4 and post-filter modes-which place deep notches at both frequencies when operated at 25 SPS with single-cycle settling. This eliminates the need for external analog filtering and ensures >80 dB rejection without firmware intervention or additional components.

Does the AD7124-8BCPZ-RL include an internal reference, and what is its accuracy?

Yes, the AD7124-8BCPZ-RL includes a precision 2.5 V bandgap reference with initial accuracy of ±0.2% and maximum drift of 10 ppm/°C over −40°C to +125°C (W grade). It delivers 70 µA output current and exhibits 85 dB power supply rejection-making it suitable for standalone operation without external references in most industrial and automotive applications.

Can the AD7124-8BCPZ-RL drive bridge sensors directly, and how is power managed?

Yes, the AD7124-8BCPZ-RL integrates a low-side power switch (PSW) with 7–10 Ω RON and 30 mA continuous rating, enabling direct drive of Wheatstone bridge sensors. The PSW is controlled via register bit and allows powering down the bridge between conversions-reducing system power consumption and self-heating errors in precision measurement applications.

What diagnostic capabilities does the AD7124-8BCPZ-RL provide for functional safety compliance?

The AD7124-8BCPZ-RL includes CRC-protected register access, reference detect, power supply monitors (ALDO/DLDO), AIN over/undervoltage detection, burnout current sources, and signal chain checks. Its FMEDA analysis shows >90% safe failure fraction (SFF) per IEC 61508, making it suitable for SIL2-capable systems without requiring external diagnostic circuitry-reducing design risk and validation burden.