Analog Devices Inc. AD7124-8BBCPZ

Overview

AD7124-8BBCPZ 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 in harsh environments. It supports 8 differential or 15 pseudo-differential inputs, offers three power modes (255 µA to 930 µA typical), delivers 24 nV rms noise at 1.17 SPS (gain = 128), and operates from −40°C to +125°C in a 32-lead LFCSP package.

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

Technical Context

The AD7124-8BBCPZ implements a multi-stage sigma-delta modulator with programmable sinc-based digital filters (Sinc4, Sinc3, Fast Settling, Post Filters), enabling configurable trade-offs between noise, settling time, and 50/60 Hz rejection. Its crosspoint multiplexer allows any analog input pin to serve as AIN, IOUT, or VBIAS, while the on-chip 10 ppm/°C bandgap reference and matched 0.1–1000 µA excitation sources eliminate external components for RTD and bridge sensor interfaces.

Diagnostics include CRC-protected register access, signal chain checks, reference detect, overvoltage/undervoltage monitoring, LDO supervision, and burnout detection-each mapped to dedicated error flags. The automatic channel sequencer supports up to 16 channels (analog + diagnostics), with independent configuration registers per channel for gain, filter, ODR, buffering, and reference source.

Key Specifications

Pinout & Package

The AD7124-8BBCPZ is housed in a 32-lead, 5 mm × 5 mm, 0.75 mm height LFCSP package with exposed thermal pad (EP). Pin functions are defined per the official Analog Devices pin configuration diagram (Rev. F, Page 15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7124-4BCPZ, the AD7124-8BBCPZ provides double the input channels and larger LFCSP footprint for higher density routing; versus ADS1263IPBSR, it trades raw noise performance for integrated sensor interface features, diagnostics, and automotive qualification-making it superior for certified industrial and automotive sensor nodes.

Availability

AD7124-8BBCPZ is available at Aetrix Electronics and suitable for industrial process control, automotive sensor modules, and smart transmitter designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for AD7124-8BBCPZ 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.

The AD7124 product line delivers highly integrated, low-power, precision ADCs with embedded diagnostics and sensor interface features-designed specifically for condition monitoring, predictive maintenance, and functional safety-critical measurement systems.

FAQ

What is the maximum output data rate of the AD7124-8BBCPZ in full power mode?

The AD7124-8BBCPZ supports a maximum output data rate of 19,200 SPS in full power mode. This mode draws 930 µA typical current and achieves 23 nV rms noise at 9.4 SPS (gain = 128). Higher ODRs are achievable with reduced gain or filtering-enabling fast control-loop sampling while retaining 24-bit resolution for moderate noise environments. The AD7124-8BBCPZ maintains specified INL and offset performance across its entire ODR range.

Does the AD7124-8BBCPZ support simultaneous 50 Hz and 60 Hz rejection, and at what data rate?

Yes, the AD7124-8BBCPZ achieves simultaneous 50 Hz and 60 Hz rejection exceeding 80 dB at 25 SPS with single-cycle settling, and up to 130 dB using its post filter at 20–25 SPS. This capability is hardware-accelerated and does not require external notch filters or firmware averaging. The AD7124-8BBCPZ implements this via synchronized digital filtering aligned to line frequency periods-ensuring robust operation in electrically noisy factory or utility environments where both frequencies may be present.

What diagnostic functions does the AD7124-8BBCPZ provide for functional safety compliance?

The AD7124-8BBCPZ integrates CRC-protected register access, signal chain checks, reference detect, supply voltage monitors (ALDO/DLDO), overvoltage/undervoltage detection on AIN pins, LDO supervision, MCLK/SCLK counters, and checksum-protected memory maps. These diagnostics collectively support >90% safe failure fraction (SFF) per IEC 61508 FMEDA analysis. The AD7124-8BBCPZ uses these features to simplify SIL-2 system certification-reducing reliance on external watchdogs or redundancy circuits.

Can the AD7124-8BBCPZ drive RTD sensors directly, and what excitation current options are available?

Yes, the AD7124-8BBCPZ drives RTDs directly using its integrated, matched excitation current sources (IOUT0/IOUT1), configurable from 0.1 µA to 1000 µA in seven steps. Current matching is ±0.5% between IOUT0 and IOUT1, with 5 ppm/°C drift-enabling accurate 2-, 3-, or 4-wire RTD measurements without external current sources. The AD7124-8BBCPZ also provides on-chip VBIAS generation and low-side power switching to optimize power and thermal stability in RTD circuits.

Is the AD7124-8BBCPZ pin-compatible with other members of the AD7124 family?

The AD7124-8BBCPZ is not pin-compatible with AD7124-4 variants due to differing package sizes (32-lead vs. 24-lead LFCSP) and pin assignments. However, it shares identical register mapping, command structure, and functional architecture with AD7124-4BCPZ and AD7124-8BRUZ-enabling software reuse across the family. The AD7124-8BBCPZ's 32-lead LFCSP package includes dedicated pins for all 15 pseudo-differential inputs, GPOs, and diagnostics not present in smaller variants.