Analog Devices Inc. AD7124-8BBCPZ-RL

Overview

AD7124-8BBCPZ-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, offers three power modes (low/mid/full), 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-RL datasheet, AD7124-8BBCPZ-RL pinout, AD7124-8BBCPZ-RL application, or AD7124-8BBCPZ-RL equivalent, key selection criteria include simultaneous 50/60 Hz rejection at 25 SPS, per-channel configuration support, AEC-Q100 qualification, rail-to-rail analog input capability for gains >1, and integrated diagnostics enabling SIL-certifiable designs.

Technical Context

The AD7124-8BBCPZ-RL implements a 24-bit Σ-Δ modulator with programmable Sinc3/Sinc4 and fast-settling filter options, supporting output data rates from 1.17 SPS to 19.2 kSPS across three power modes. Its crosspoint multiplexer enables flexible channel routing, while the on-chip 10 ppm/°C bandgap reference and matched 0.1–1000 µA excitation current sources eliminate external components for RTD and bridge sensor interfaces.

Diagnostics include CRC-protected register access, signal chain checks, reference detect, overvoltage/undervoltage monitoring, and burnout detection-enabling robust fault coverage. The device features an automatic channel sequencer supporting up to 16 channels (analog inputs + diagnostics), per-channel gain/filter/ODR configuration, and dual LDOs (1.8 V and 1.9 V) for analog/digital supply isolation.

Key Specifications

Pinout & Package

AD7124-8BBCPZ-RL 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 Analog Devices' Rev. F datasheet, Figure 15 (Pin Configuration and Function Descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7124-4BRUZ, AD7124-8BBCPZ-RL provides double the input count, GPOs, and sequencer flexibility-essential for multi-sensor nodes. Versus ADS1262IPW, it trades raw speed for comprehensive sensor interface features (excitation, burnout, PSW) and functional safety support, making it superior for certified industrial and automotive sensing.

Availability

AD7124-8BBCPZ-RL is available at Aetrix Electronics and suitable for temperature measurement, pressure sensing, and industrial process control applications requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.

Supply support for AD7124-8BBCPZ-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.

The AD7124 family targets high-accuracy, low-power sensor signal conditioning-specifically engineered for RTD, thermocouple, strain gauge, and pressure transducer interfaces in harsh, safety-critical environments.

FAQ

What is the operating temperature range of the AD7124-8BBCPZ-RL?

The AD7124-8BBCPZ-RL is rated for operation from −40°C to +125°C and is AEC-Q100 Grade 1 qualified. This extended range ensures reliable performance in under-hood automotive systems, industrial PLCs, and outdoor instrumentation where ambient extremes are common. All specifications-including noise, INL, and reference drift-are guaranteed across this full range per the Rev. F datasheet.

Does the AD7124-8BBCPZ-RL support both internal and external reference configurations?

Yes, the AD7124-8BBCPZ-RL supports either its internal 2.5 V bandgap reference (10 ppm/°C drift, 70 µA quiescent) or an external differential reference applied to REFIN1(±) or REFIN2(±). External references can be unbuffered or internally buffered, and the device automatically detects reference presence and validity via its reference detect diagnostic function.

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

The AD7124-8BBCPZ-RL achieves simultaneous 50 Hz and 60 Hz rejection using its Sinc4 or post-filter configurations at 25 SPS, where the first notch falls exactly at both frequencies with single-cycle settling. This eliminates need for external notch filters and ensures >80 dB rejection in electrically noisy factory or utility environments-verified in Table 3 and Figure 52 of the datasheet.

Can the AD7124-8BBCPZ-RL drive RTD sensors directly?

Yes, the AD7124-8BBCPZ-RL integrates two matched, programmable excitation current sources (0.1–1000 µA) that can be routed to any AINx pin. Combined with its internal VBIAS generator and per-channel configuration, it supports 2-/3-/4-wire RTD measurements without external components-reducing BOM cost and layout complexity while maintaining <0.1% matching error.

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

The AD7124-8BBCPZ-RL includes CRC-protected register access, signal chain checks, reference detect, supply voltage monitors (ALDO/DLDO), overvoltage/undervoltage detection on AIN pins, burnout current detection, and memory checksums. Its FMEDA analysis shows >90% safe failure fraction per IEC 61508, enabling use in SIL2-capable systems without additional external safety circuitry.