Analog Devices Inc. AD7124-4BRUZ-RL

Overview

AD7124-4BRUZ-RL from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, reference, excitation currents, and diagnostics-designed for high-precision industrial sensor measurement. It delivers 24 nV rms noise at 1.17 SPS (gain = 128), supports 4 differential or 7 pseudo-differential inputs, operates from −40°C to +125°C, and features simultaneous 50/60 Hz rejection at 25 SPS for temperature, pressure, and smart transmitter applications.

For engineers reviewing the AD7124-4BRUZ-RL datasheet, AD7124-4BRUZ-RL pinout, AD7124-4BRUZ-RL application, or AD7124-4BRUZ-RL equivalent, key selection criteria include RMS noise vs. power mode trade-offs, per-channel configuration flexibility, integrated diagnostics for SIL-certifiable systems, and support for rail-to-rail analog inputs with programmable gain up to 128.

Technical Context

The AD7124-4BRUZ-RL implements a fully integrated analog front end with three selectable power modes (low/mid/full), each defining distinct current consumption (255 µA / 355 µA / 930 µA typ), output data rate ranges (1.17–2400 / 2.34–4800 / 9.38–19,200 SPS), and RMS noise performance (24 nV / 20 nV / 23 nV at gain = 128). Its Sinc4/Sinc3/post-filter architecture enables configurable notch placement for 50/60 Hz rejection without external components.

It integrates a 10 ppm/°C internal band gap reference, matched 0.1–1000 µA excitation current sources with ±4% initial tolerance, low-side power switch (RON = 10 Ω), on-chip bias voltage generator (AVDD/2), and self/system calibration logic-all controlled via an SPI/QSPI/MICROWIRE-compatible 3-/4-wire serial interface with Schmitt-triggered SCLK.

Key Specifications

Pinout & Package

AD7124-4BRUZ-RL is housed in a 24-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for compact industrial PCB layouts and thermal stability across extended temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7124-8BRUZ, the AD7124-4BRUZ-RL offers identical per-channel performance in a smaller channel-count configuration, reducing software complexity and register map overhead. Against ADS124S08IPWR, it provides higher integration (reference, excitation, diagnostics) at the cost of higher minimum supply voltage and slightly higher quiescent current in low-power mode.

Availability

AD7124-4BRUZ-RL is available at Aetrix Electronics and suitable for temperature measurement, pressure transmitter design, and industrial process control applications requiring stable component supply, long-lifecycle availability, and guaranteed traceability.

Supply support for AD7124-4BRUZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7124 family was designed specifically for high-accuracy, low-power sensor signal conditioning in harsh industrial environments-emphasizing integrated diagnostics, wide temperature operation, and simplified system-level certification.

FAQ

What power supply voltages does the AD7124-4BRUZ-RL require?

The AD7124-4BRUZ-RL requires separate analog and digital supplies: AVDD from 2.7 V to 3.6 V (2.9–3.6 V for full power mode), AVSS from −1.8 V to 0 V, and IOVDD from 1.65 V to 3.6 V. This dual-supply architecture isolates noise-sensitive analog circuitry from digital switching transients, ensuring optimal 24-bit performance in mixed-signal systems. The AD7124-4BRUZ-RL supports true bipolar operation with the negative analog rail.

Does the AD7124-4BRUZ-RL support simultaneous 50 Hz and 60 Hz rejection?

Yes, the AD7124-4BRUZ-RL achieves simultaneous 50 Hz and 60 Hz rejection exceeding 80 dB at 25 SPS using its Sinc4 filter with single-cycle settling. This is implemented via hardware-configurable notch placement-no firmware intervention or external filtering required. The AD7124-4BRUZ-RL maintains this rejection across all power modes and is validated per IEC 61000-4-7 for conducted emissions immunity in industrial settings.

How many configuration setups does the AD7124-4BRUZ-RL support for per-channel operation?

The AD7124-4BRUZ-RL supports eight independent configuration setups, each defining gain (1–128), filter type (Sinc4/Sinc3/post), output data rate, input buffering, and reference source. These setups can be assigned individually to any of the 16 enabled channels-including analog inputs and diagnostics like reference checks or power supply monitors-enabling heterogeneous sensor interfacing without runtime reconfiguration overhead. This capability is intrinsic to the AD7124-4BRUZ-RL's register architecture.

What diagnostic functions are integrated into the AD7124-4BRUZ-RL?

The AD7124-4BRUZ-RL integrates CRC protection for register memory and communication, signal chain checks (open-circuit, short-circuit, reference integrity), overvoltage/undervoltage detection on AIN and REFIN pins, ALDO/DLDO power supply monitoring, and SPI interface error detection (read/write, ignore, checksum). These diagnostics collectively achieve >90% safe failure fraction (SFF) per IEC 61508, making the AD7124-4BRUZ-RL suitable for SIL-2 functional safety applications without external supervisory ICs.

Can the AD7124-4BRUZ-RL operate with an external reference, and what are the voltage limits?

Yes, the AD7124-4BRUZ-RL accepts an external differential reference applied to REFIN+ and REFIN− pins, with valid voltage range from 0.5 V to AVDD (unbuffered) or AVSS + 0.1 V to AVDD − 0.1 V (buffered). The device internally buffers external references to minimize loading effects, and supports ratiometric measurements where reference voltage scales with excitation current. This flexibility allows use of ultra-low-drift external references while retaining the AD7124-4BRUZ-RL's integrated PGA and diagnostics.