Analog Devices Inc. AD7124-4BCPZ-RL7

Overview

AD7124-4BCPZ-RL7 from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, reference, excitation currents, and diagnostics-designed for high-precision sensor measurement. It supports 4 differential or 7 pseudo-differential inputs, operates across −40°C to +125°C, delivers up to 22 noise-free bits at gain = 1, and achieves simultaneous 50/60 Hz rejection at 25 SPS with >80 dB attenuation.

For engineers reviewing the AD7124-4BCPZ-RL7 datasheet, AD7124-4BCPZ-RL7 pinout, AD7124-4BCPZ-RL7 application, or AD7124-4BCPZ-RL7 equivalent, key selection criteria include RMS noise (20–24 nV), programmable power modes (low/mid/full), per-channel configuration flexibility, integrated diagnostics for SIL compliance, and LFCSP-32 package compatibility with industrial temperature range requirements.

Technical Context

The AD7124-4BCPZ-RL7 implements a multi-stage sigma-delta modulator with Sinc4/Sinc3/Fast Settling filter options, enabling configurable trade-offs between noise, settling time, and 50/60 Hz rejection. Its on-chip PGA (gain 1–128) and rail-to-rail analog input support direct connection of low-amplitude sensors like RTDs and thermocouples without external signal conditioning.

Diagnostics include CRC, reference detect, overvoltage/undervoltage monitoring, LDO supervision, and burnout current detection-all mapped to dedicated registers and supporting FMEDA with >90% safe failure fraction (IEC 61508). The device uses an internal 614.4 kHz oscillator or accepts external clocking, and features a channel sequencer supporting up to 16 enabled channels (analog inputs + diagnostics) with interleaved conversion scheduling.

Key Specifications

Pinout & Package

The AD7124-4BCPZ-RL7 is housed in a 32-lead 5 mm × 5 mm LFCSP package (CP-32-3), with exposed thermal pad for enhanced thermal performance. Pin functions are defined per Analog Devices' Rev. E datasheet Figure 15 (Pin Configurations and Function Descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7124-8BCPZ-RL7, the AD7124-4BCPZ-RL7 offers identical precision and diagnostics in a lower-channel-count variant, reducing firmware complexity; versus ADS1262IPW, it provides integrated excitation and bias generation but at higher unit cost-justified where board space and safety certification are critical.

Availability

AD7124-4BCPZ-RL7 is available at Aetrix Electronics and suitable for industrial process control, smart transmitter design, and high-reliability temperature measurement requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7124-4BCPZ-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 AD7124-4BCPZ-RL7 belongs to the AD7124 family of precision sigma-delta ADCs engineered specifically for high-integrity sensor measurement in harsh environments-emphasizing low noise, integrated diagnostics, and flexible power management for industrial IoT and functional safety applications.

FAQ

What is the maximum output data rate of the AD7124-4BCPZ-RL7 in full power mode?

The AD7124-4BCPZ-RL7 supports a maximum output data rate of 19,200 SPS in full power mode. This rate is achievable with the Sinc4 filter and enables high-speed acquisition for applications such as fast-response pressure monitoring or vibration analysis, while maintaining 24-bit no-missing-codes performance and <24 nV rms noise at gain = 128.

Does the AD7124-4BCPZ-RL7 include an internal voltage reference, and what is its temperature drift?

Yes, the AD7124-4BCPZ-RL7 integrates a precision 2.5 V band gap reference with a maximum drift of 10 ppm/°C (LFCSP package). This specification applies to the AD7124-4BCPZ-RL7 variant and is confirmed in Table 1 and Section "REFERENCE INPUT" of the Rev. E datasheet. The reference supports buffered and unbuffered operation and contributes to the device's ability to achieve 22 noise-free bits without external components.

Can the AD7124-4BCPZ-RL7 perform simultaneous 50 Hz and 60 Hz rejection, and at what data rate?

Yes, the AD7124-4BCPZ-RL7 achieves simultaneous 50 Hz and 60 Hz rejection with >80 dB attenuation at an output data rate of 25 SPS using single-cycle settling. This capability is explicitly documented in the General Description and Specifications sections of the Rev. E datasheet and is enabled by the Sinc4 filter with REJ60 bit configuration-critical for noise immunity in globally deployed industrial equipment.

What package type and dimensions does the AD7124-4BCPZ-RL7 use?

The AD7124-4BCPZ-RL7 uses a 32-lead LFCSP package (CP-32-3), measuring 5 mm × 5 mm × 0.75 mm with an exposed thermal pad. This package is specified in the Outline Dimensions section (page 93) of the Rev. E datasheet and differs from the TSSOP variant in height and thermal performance-ensuring robust operation in high-density PCB layouts and thermally demanding environments.

How many excitation current sources does the AD7124-4BCPZ-RL7 provide, and what are their matching specifications?

The AD7124-4BCPZ-RL7 provides two fully programmable excitation current sources (IOUT0 and IOUT1), each configurable from 0.1 µA to 1000 µA in seven steps. Their matching is specified as ±0.5% at 25°C with 5–30 ppm/°C drift matching-enabling precise ratiometric measurements in 3- and 4-wire RTD configurations without external trimming or calibration.