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Analog Devices Inc. AD7731BRZ-REEL
- Part No.:
- AD7731BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7731BRZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:161
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Product details
Overview
AD7731BRZ-REEL from Analog Devices is a 24-bit sigma-delta analog-to-digital converter optimized for high-precision process control front ends. It features a programmable gain amplifier supporting seven unipolar (0 to +1.28 V) and seven bipolar (±1.28 V) input ranges, 16-bit peak-to-peak resolution at 800 Hz output rate, and integrated self/system calibration. It is used in PLCs and industrial instrumentation where low-noise, multi-channel transducer signal acquisition is required.
For engineers reviewing the AD7731BRZ-REEL datasheet, AD7731BRZ-REEL pinout, AD7731BRZ-REEL application, or AD7731BRZ-REEL equivalent, key selection considerations include its 24-bit no-missing-codes performance, FASTStep™ channel sequencing mode, ±5 nV/°C offset drift (CHP = 1), differential reference input compatibility, and SOIC_W package suitability for space-constrained industrial PCBs.
Technical Context
The AD7731BRZ-REEL implements a two-stage digital filter comprising a programmable SINC³ modulator followed by a 22-tap FIR or FASTStep™ adaptive filter, enabling configurable output rates up to 6.4 kHz and settling times as fast as 1 ms between channels. Its on-chip buffer amplifier presents >1 GΩ input impedance and supports external source impedances up to 10 kΩ without degradation.
It integrates transducer burnout detection via dual 100 nA current sources on AIN1(±), a chopper-stabilized PGA with <2 ppm/°C gain drift, and SPI-compatible three-wire serial interface with polarity-selectable clock (POL pin) and RDY-driven data-ready signaling - all operating from a single +5 V AVDD supply and +2.7 V to +5.25 V DVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes; guarantees monotonicity across full dynamic range. |
| Peak-to-Peak Resolution | 16 bits at 800 Hz output rate - enables high-fidelity DC/low-frequency measurement of strain gauges and RTDs. |
| Input Ranges | Seven unipolar (0 to +1.28 V) and seven bipolar (±1.28 V); selectable via RN2–RN0 bits for direct transducer interfacing. |
| Offset Drift | 5 nV/°C (CHP = 1 mode); ensures stable zero-point accuracy over industrial temperature range (−40°C to +85°C). |
| Gain Drift | 2 ppm/°C max; minimizes span error accumulation in long-duration measurements without recalibration. |
| Common-Mode Rejection | 110 dB at DC (20 mV range); rejects noise from shared ground paths in noisy plant-floor environments. |
| Power Supply Rejection | 110 dB at DC (20 mV range); maintains accuracy despite ripple on +5 V AVDD rail. |
| Channel Settling Time | 1 ms between six analog inputs; supports rapid multiplexed acquisition in multi-sensor systems. |
Pinout & Package
The AD7731BRZ-REEL is housed in a 24-lead SOIC_W (RW-24) package with 0.75 mm body width and 300 mil width, RoHS-compliant and reel-packaged for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; controls timing of SPI read/write transfers; polarity set by POL pin. |
| MCLK IN / MCLK OUT | Master clock interface | Accepts 1–5 MHz crystal/resonator or CMOS clock; MCLK OUT provides inverted clock for synchronous peripherals. |
| AIN1–AIN6 | Differential/pseudo-differential analog inputs | Three fully differential pairs or five pseudo-differential inputs; buffered, PGA-enabled, with burnout current support. |
| REF IN(+), REF IN(–) | Differential reference input | Accepts +2.5 V or +5 V nominal reference; enables ratiometric operation and open/short detection. |
| AIN3/D1, AIN4/D0 | Configurable I/O | Programmable as analog inputs or digital outputs (D1/D0) via DEN bit - adds GPIO capability without external components. |
| RDY | Data-ready indicator | Active-low open-drain output signals valid conversion result; synchronizes host microcontroller reads. |
| SYNC | Multi-device synchronization | Resets digital filters and analog modulators across multiple AD7731 units for coherent sampling in distributed systems. |
| STANDBY | Low-power mode control | Puts device into 10 µA standby state; reduces power consumption during idle periods in battery-backed systems. |
Key Features
| Feature | Design Value |
|---|---|
| FASTStep™ channel sequencing | Enables sub-1 ms settling between input channels while maintaining ≥13-bit p-p resolution - critical for high-throughput sensor arrays. |
| Integrated burnout detection | Dual 100 nA current sources on AIN1(±) allow open-circuit fault detection in 4–20 mA loops and RTD wiring without external circuitry. |
| Chopper-stabilized PGA | Reduces 1/f noise and drift; achieves <5 nV/°C offset drift and <2 ppm/°C gain drift - eliminates need for frequent system recalibration. |
| Self- and system-calibration engine | On-chip microcontroller executes zero-scale and full-scale calibrations; reduces precalibration offset error to ~3 µV and gain error to <100 ppm. |
| Differential reference input | Supports ratiometric measurement against stable external references; provides 120 dB rejection on REF IN pins - improves immunity to reference voltage drift. |
| Three-wire SPI-compatible interface | Requires only CS, SCLK, and DOUT/DIN; compatible with most microcontrollers and DSPs; eliminates need for additional level-shifting or protocol translation. |
Applications
| PLC Analog Input Module | Industrial Weigh Scale Controller |
|---|---|
|
Use Scenario: Acquiring signals from multiple load cells and pressure transducers in a modular rack-mounted PLC chassis. IC Role / Device Role / Timing Role: Primary ADC front end handling six differential sensor inputs with automatic channel switching and ratiometric reference tracking. Use Value: 1 ms channel settling and FASTStep™ mode enable synchronized sampling across 8+ channels per module while preserving 13-bit effective resolution. |
Use Scenario: High-accuracy weight measurement in commercial food packaging or pharmaceutical filling machines. IC Role / Device Role / Timing Role: Precision digitizer for bridge-based load cells; uses internal 100 nA burnout currents to detect broken sensor wires before startup. Use Value: <5 nV/°C offset drift and 2 ppm/°C gain drift ensure repeatability within ±0.005% FS over ambient temperature swings without recalibration. |
| DCS Remote I/O Terminal | High-Resolution Data Logger |
|
Use Scenario: Distributed field-mounted analog input terminal acquiring thermocouple, RTD, and 4–20 mA loop signals in oil & gas refineries. IC Role / Device Role / Timing Role: Isolated analog front end with differential inputs, common-mode rejection >110 dB, and robust ESD protection (4 kV HBM). Use Value: 110 dB CMR at DC and 88 dB 50/60 Hz normal-mode rejection suppress interference from nearby VFDs and motor drives. |
Use Scenario: Battery-powered environmental monitoring node logging temperature, humidity, and gas sensor outputs over weeks. IC Role / Device Role / Timing Role: Low-power ADC with STANDBY pin control; draws only 10 µA in sleep mode while retaining register state. Use Value: Standby current of 10 µA extends battery life beyond 1 year in intermittent-sampling applications using coin-cell or Li-SOCl₂ batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7730BRZ | 24-bit, but only two differential inputs; lacks FASTStep™ and AIN3/D1–AIN4/D0 GPIO functionality; lower update rate (1.2 kHz max). | Better suited for simple dual-channel weigh scale designs; not viable for 6-input multiplexed systems requiring fast settling. | Select AD7730BRZ only when channel count and sequencing speed requirements are minimal and cost is primary constraint. |
| ADS1258IPWR | 24-bit, eight differential inputs, 125 kSPS max; higher power (12 mW active), no integrated burnout current or chopper stabilization. | Targeted at high-speed data acquisition rather than ultra-low-drift industrial sensing; requires external burnout circuitry and calibration logic. | Choose ADS1258IPWR when throughput >1 kHz is mandatory and system-level drift compensation is already implemented. |
Compared with AD7731BRZ-REEL, AD7730BRZ offers lower integration and reduced channel flexibility, while ADS1258IPWR trades precision stability and embedded diagnostics for raw speed - making AD7731BRZ-REEL optimal for deterministic, low-drift, multi-sensor industrial front ends.
Availability
AD7731BRZ-REEL is available at Aetrix Electronics and suitable for PLC analog input modules, industrial weigh scale controllers, and DCS remote I/O terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC_W packaging.
Supply support for AD7731BRZ-REEL 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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7731BRZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for industrial process control applications demanding low drift, high noise immunity, and seamless transducer interfacing without external signal conditioning.
FAQ
What is the maximum output data rate supported by the AD7731BRZ-REEL?
The AD7731BRZ-REEL supports programmable output rates up to 6.4 kHz in SKIP mode, where only the SINC³ filter is active. In normal mode with both SINC³ and 22-tap FIR filtering enabled, the maximum rate is 800 Hz at 16-bit peak-to-peak resolution. The actual rate depends on filter configuration, clock frequency (4.9152 MHz nominal), and selected input range - all controlled via the Mode Register.
Does the AD7731BRZ-REEL require an external reference voltage?
No, the AD7731BRZ-REEL accepts an external differential reference but does not require one - it operates ratiometrically. The reference input (REF IN(+) and REF IN(–)) can be driven by a stable +2.5 V or +5 V source, selected via the HIREF bit. Internal biasing allows use with standard precision references; no external reference IC is mandatory unless higher absolute accuracy is needed beyond the part's inherent 0.0015% nonlinearity.
How does the FASTStep™ mode improve channel switching performance in the AD7731BRZ-REEL?
FASTStep™ mode dynamically replaces the default 22-tap FIR filter with a faster-converging adaptive filter upon detection of a step input change. This reduces settling time from typical 100 ms to under 1 ms while maintaining ≥13-bit peak-to-peak resolution - enabling rapid scanning across all six analog inputs (AIN1–AIN6) without sacrificing measurement fidelity in multi-sensor industrial systems using the AD7731BRZ-REEL.
Can the AD7731BRZ-REEL operate from a single 3.3 V supply?
No - the AD7731BRZ-REEL requires AVDD = +5 V (±5%) for analog circuitry; DVDD may be +2.7 V to +5.25 V for digital logic. A single 3.3 V rail cannot power AVDD. However, DVDD can be supplied from 3.3 V while AVDD remains at 5 V, allowing interoperability with 3.3 V microcontrollers via level-shifted SPI signals. The AD7731BRZ-REEL is not specified for full 3.3 V operation.
What is the purpose of the AIN3/D1 and AIN4/D0 pins on the AD7731BRZ-REEL?
These pins are multifunctional: configured as analog inputs by default, they become general-purpose digital outputs (D1 and D0) when the DEN bit in the Mode Register is set. Each output is software-programmable over the SPI interface, providing two auxiliary GPIO lines - useful for driving status LEDs, enabling external circuitry, or controlling auxiliary sensors without adding discrete I/O expanders to the AD7731BRZ-REEL design.
AD7731BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 6.4k
- Number of Inputs:
- 3, 5
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7731BRZ-REEL FAQ
1.How can I place an order for AD7731BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7731BRZ-REEL 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 AD7731BRZ-REEL reliable?
The price and inventory of AD7731BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7731BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7731BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7731BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7731BRZ-REEL?
AD7731BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7731BRZ-REEL 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 AD7731BRZ-REEL?
For technical support, including AD7731BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7731BRZ-REEL requirements.
6.How does Aetrix verify that AD7731BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7731BRZ-REEL 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 AD7731BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7731BRZ-REEL?
All AD7731BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7731BRZ-REEL, 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 AD7731BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7731BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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