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Analog Devices Inc. AD7124-4BBCPZ-RL
- Part No.:
- AD7124-4BBCPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7124-4BBCPZ-RL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,891
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Product details
Overview
AD7124-4BBCPZ-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 integrates rail-to-rail analog input buffers for gains >1 in a 32-lead LFCSP package.
For engineers reviewing the AD7124-4BBCPZ-RL datasheet, AD7124-4BBCPZ-RL pinout, AD7124-4BBCPZ-RL application, or AD7124-4BBCPZ-RL equivalent, key selection criteria include simultaneous 50/60 Hz rejection at 25 SPS, per-channel configuration across 16 channels, internal 10 ppm/°C band gap reference, low-side power switch for bridge sensor control, and SIL-supporting diagnostics including CRC, reference detect, and burnout detection.
Technical Context
The AD7124-4BBCPZ-RL implements a multi-stage sigma-delta modulator with programmable sinc4/sinc3/fast-settling/post filters, enabling configurable trade-offs between noise, settling time, and 50/60 Hz rejection. Its on-chip PGA (gain 1–128) and matched 0.1–1000 µA excitation current sources support direct RTD, thermocouple, and bridge sensor interfacing without external components.
It features a channel sequencer supporting up to 16 enabled channels-including analog inputs and diagnostics-and eight independent per-channel configurations (gain, filter, ODR, reference, buffering). The device uses an internal 614.4 kHz oscillator or accepts external clock, and includes dual LDOs (ALDO/DLDO) with voltage monitors for functional safety compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Noise | 24 nV rms @ 1.17 SPS, gain = 128 - enables sub-µV-level resolution in ultra-low-power sensor readout |
| Output Data Rate | 1.17–19,200 SPS across three power modes - allows dynamic adaptation to signal bandwidth and power budget |
| INL Error | ±1 ppm of FSR @ gain = 12 - ensures linearity critical for calibration-grade instrumentation |
| Common-Mode Rejection | 115 dB @ gain ≥ 8 - suppresses noise in noisy industrial environments with unshielded wiring |
| Reference Drift | 10 ppm/°C (LFCSP) - guarantees stable 2.5 V reference over full −40°C to +125°C operating range |
| Power-Down Current | ≤3 µA - minimizes system standby power for battery-operated field transmitters |
| Excitation Matching | ±0.5% between IOUT0/IOUT1 - eliminates gain mismatch errors in 4-wire RTD measurements |
| Simultaneous 50/60 Hz Rejection | >80 dB @ 25 SPS - achieves single-cycle settling for AC-line-immune temperature/pressure acquisition |
Pinout & Package
AD7124-4BBCPZ-RL is housed in a 32-lead 5 mm × 5 mm × 0.75 mm LFCSP package with exposed thermal pad (EP). Pin functions are validated per Analog Devices' Rev. E datasheet Figure 15 (Pin Configurations and Function Descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVDD, AVSS | Analog Power Supply Rails | Support 2.7–3.6 V single supply or ±1.8 V dual supply; AVSS may be negative for bipolar operation |
| IOVDD | Digital Interface Supply | Independent 1.65–3.6 V rail enables level-shifting with host MCU without shared noise coupling |
| AIN0–AIN3, AIN4–AIN6 | Analog Input Terminals | Support 4 differential or 7 pseudo-differential configurations; buffered automatically at gain >1 |
| REFIN+, REFIN− | Differential Reference Inputs | Accept internal 2.5 V reference or external source; internal buffer optional for high-Z sources |
| DOUT/RDY | Data Ready / Serial Output | Open-drain RDY flag indicates conversion completion; also serves as SPI data output (3-/4-wire mode) |
| SCLK, CS, DIN | SPI Interface Signals | Full SPI/QSPI/MICROWIRE/DSP compatibility; Schmitt-triggered SCLK tolerates noisy industrial timing |
| P1, P2 | General-Purpose Outputs | Configurable logic outputs; used for sync pulses, LED control, or external multiplexer selection |
| VBIAS | Bias Voltage Generator Output | Provides AVDD/2 common-mode voltage to enable pseudo-differential measurements on single-ended sensors |
| IOUT0, IOUT1 | Programmable Excitation Currents | 0.1–1000 µA sources with ±4% initial tolerance and ±0.5% matching - calibrated for 4-wire RTD accuracy |
| SW | Low-Side Power Switch Control | Drives external N-channel MOSFET to disconnect bridge sensors between conversions, eliminating idle current |
Key Features
| Feature | Design Value |
|---|---|
| Three Integrated Power Modes | Enables dynamic optimization: low power (255 µA) for battery life, full power (930 µA) for speed, mid power for balanced performance |
| Per-Channel Configuration (8 setups) | Allows independent gain, filter, ODR, and reference assignment per input-critical for mixed-sensor systems (e.g., RTD + thermocouple + strain gauge) |
| Simultaneous 50/60 Hz Rejection | Hardware-accelerated notch filtering at 25 SPS eliminates need for software post-processing or external notch filters |
| Integrated Diagnostics Suite | CRC, reference detect, supply monitor, burnout detection, and memory checksum meet IEC 61508 SIL requirements (SFF >90%) |
| On-Chip Bias Voltage Generator | Generates precise AVDD/2 for pseudo-differential sensing-removes need for external resistor dividers and op-amps |
| Matched Excitation Current Sources | 0.1–1000 µA with ±0.5% matching enables high-accuracy 4-wire RTD measurements without external calibration |
Applications
| Temperature Measurement | Pressure Measurement |
|---|---|
Use Scenario: High-accuracy RTD-based temperature monitoring in HVAC controllers and process skids, operating continuously at −40°C to +125°C ambient. IC Role / Device Role / Timing Role: Primary ADC front end with integrated 100 µA excitation, bias voltage, and cold-junction compensation via on-chip temperature sensor. Use Value: Eliminates external current sources, op-amps, and reference buffers-reducing BOM count by ≥7 components while maintaining ±0.1°C system accuracy. | Use Scenario: Strain-gauge-based pressure transducer in oil & gas downhole tools, requiring robust 50/60 Hz rejection and low power during intermittent logging. IC Role / Device Role / Timing Role: Precision sigma-delta converter with programmable gain, low-side switch for bridge power gating, and fast-settling filter for rapid pressure snapshots. Use Value: Achieves 22 noise-free bits at 1200 SPS while cutting average system current to <100 µA via automatic bridge shutdown between readings. |
| Industrial Process Control | Smart Transmitters |
Use Scenario: Multi-sensor field transmitter aggregating flow, level, and temperature data for HART or WirelessHART communication. IC Role / Device Role / Timing Role: Central analog acquisition hub with 16-channel sequencer, diagnostics, and per-input configuration for heterogeneous sensor types. Use Value: Enables single-chip support for 4+ sensor inputs with SIL-compliant diagnostics-replacing discrete ADC + microcontroller + safety monitor solutions. | Use Scenario: Loop-powered 4–20 mA smart transmitter with local display, requiring ultra-low quiescent current and metrology-grade linearity. IC Role / Device Role / Timing Role: Primary measurement engine with internal 2.5 V reference (10 ppm/°C), self-calibration, and 5 µA power-down mode for sleep-state energy conservation. Use Value: Meets IEC 61298-2 Class A linearity (±0.05% FS) and extends battery life by 3× vs. discrete reference + ADC architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7124-8BCPZ-RL | 8-channel variant in same 32-lead LFCSP; identical noise, power, and feature set but doubles input count | Required when >4 analog inputs needed without external multiplexing | Select AD7124-8BCPZ-RL only if system requires ≥5 differential inputs; otherwise AD7124-4BBCPZ-RL offers better channel-to-noise ratio per mm² |
| LTC2499CGN#PBF | 24-bit delta-sigma ADC with 16-channel mux; no integrated PGA, reference, or excitation; higher 35 nV rms noise at 7.5 SPS | Lacks on-chip diagnostics, bias generator, and burnout detection-requires external circuitry for RTD/bridge use | Choose LTC2499CGN#PBF only for cost-sensitive, non-SIL applications where external support components are acceptable |
Compared with AD7124-8BCPZ-RL, the AD7124-4BBCPZ-RL provides identical per-channel performance in a smaller footprint and lower base current, making it optimal for space-constrained 4-input systems; versus LTC2499CGN#PBF, it delivers integrated signal conditioning and functional safety features that reduce total design effort by ~40% for industrial sensor nodes.
Availability
AD7124-4BBCPZ-RL is available at Aetrix Electronics and suitable for industrial process control, smart transmitter design, and high-reliability temperature/pressure measurement requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7124-4BBCPZ-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-precision, low-power industrial sensor measurement-integrating all signal chain elements (PGA, reference, excitation, diagnostics) into a single IC to simplify certified field instrument design.
FAQ
What is the maximum output data rate of the AD7124-4BBCPZ-RL in full power mode?
The AD7124-4BBCPZ-RL supports a maximum output data rate of 19,200 SPS in full power mode. This rate is achievable with sinc4 filtering and gain = 1, and remains stable across the full −40°C to +125°C operating temperature range. At higher gains, the maximum ODR decreases due to increased filter settling time-e.g., 9.38 SPS at gain = 128.
Does the AD7124-4BBCPZ-RL include an internal voltage reference, and what is its accuracy?
Yes, the AD7124-4BBCPZ-RL includes an internal 2.5 V band gap reference with ±0.2% initial accuracy at 25°C and a maximum drift of 10 ppm/°C over temperature. This reference is fully integrated and requires no external components, and it can be used directly or buffered for driving external circuits. Its drift specification applies specifically to the LFCSP package version (AD7124-4BBCPZ-RL), not the TSSOP variant.
Can the AD7124-4BBCPZ-RL perform simultaneous 50 Hz and 60 Hz rejection, and at what data rate?
Yes, the AD7124-4BBCPZ-RL 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 hardware-implemented in the digital filter and does not require firmware intervention. The rejection is maintained across all power modes and is independent of gain setting, making it ideal for AC-coupled industrial environments.
How many analog input channels does the AD7124-4BBCPZ-RL support, and what configurations are available?
The AD7124-4BBCPZ-RL supports up to four fully differential input channels or seven pseudo-differential (single-ended) channels. Channel configuration is flexible: AIN0–AIN3 can be paired as differential inputs (e.g., AIN0–AIN1), while AIN4–AIN6 serve as additional pseudo-differential inputs referenced to AVSS or VBIAS. All inputs share the same PGA, reference, and filter resources, and each can be assigned independently via the channel sequencer.
What diagnostic features does the AD7124-4BBCPZ-RL provide for functional safety compliance?
The AD7124-4BBCPZ-RL includes CRC protection on registers and memory, reference detect, analog supply (ALDO/DLDO) monitoring, AIN overvoltage/undervoltage detection, burnout current detection, and checksum validation for ROM and memory map. These features collectively support IEC 61508 certification, with FMEDA analysis showing a safe failure fraction (SFF) exceeding 90%. All diagnostics operate autonomously without host processor intervention.
AD7124-4BBCPZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 19.2k
- Number of Inputs:
- 4, 7
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- DSP, MICROWIRE™, QSPI™, and SPI™
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.65V ~ 3.6V
- Features:
- PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-LFCSP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7124-4BBCPZ-RL FAQ
1.How can I place an order for AD7124-4BBCPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7124-4BBCPZ-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7124-4BBCPZ-RL reliable?
The price and inventory of AD7124-4BBCPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7124-4BBCPZ-RL is usually 5 days.
3.What payment methods are accepted for AD7124-4BBCPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7124-4BBCPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7124-4BBCPZ-RL?
AD7124-4BBCPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7124-4BBCPZ-RL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7124-4BBCPZ-RL?
For technical support, including AD7124-4BBCPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7124-4BBCPZ-RL requirements.
6.How does Aetrix verify that AD7124-4BBCPZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7124-4BBCPZ-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7124-4BBCPZ-RL meets industry standards.
7.What is the process for return or replacement of AD7124-4BBCPZ-RL?
All AD7124-4BBCPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7124-4BBCPZ-RL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7124-4BBCPZ-RL part is unused and in its original packaging.
Return procedure for AD7124-4BBCPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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