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Analog Devices Inc. AD7731BR-REEL7
- Part No.:
- AD7731BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7731BR-REEL7.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,921
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Product details
Overview
AD7731BR-REEL7 from Analog Devices is a 24-bit sigma-delta analog-to-digital converter optimized for high-precision industrial process control front ends. It features a programmable gain amplifier (PGA), three buffered differential analog inputs (configurable as five pseudo-differential channels), differential reference input, and integrated digital filtering with FASTStep™ mode. It delivers 16-bit peak-to-peak resolution at 800 Hz output rate and supports ±20 mV to ±1.28 V bipolar input ranges - ideal for direct transducer interfacing in PLCs and instrumentation.
For engineers reviewing the AD7731BR-REEL7 datasheet, AD7731BR-REEL7 pinout, AD7731BR-REEL7 application, or AD7731BR-REEL7 equivalent, key selection considerations include its 24-bit no-missing-codes performance, <5 nV/°C offset drift, 2 ppm/°C gain drift, single +5 V analog supply operation, and SPI-compatible 3-wire serial interface with channel sequencing capability.
Technical Context
The AD7731BR-REEL7 implements a two-stage digital filter: a programmable SINC³ modulator followed by either a 22-tap FIR filter (default) or FASTStep™ adaptive filter for rapid step-response settling. Its on-chip PGA enables seven unipolar and seven bipolar input ranges without external signal conditioning.
It integrates self-calibration and system calibration modes, supports transducer burnout detection via ±100 nA currents on AIN1(±), and provides ratiometric operation through its differential reference input (±2.5 V or ±5 V selectable). The device operates across –40°C to +85°C and achieves 95 dB CMR at DC for 20 mV input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit sigma-delta with no missing codes - guarantees monotonicity and full code coverage over temperature. |
| Peak-to-Peak Resolution | 16 bits at 800 Hz output rate - enables high dynamic range measurement of low-level transducer signals. |
| Input Ranges | Seven bipolar (±20 mV to ±1.28 V) and seven unipolar (0–20 mV to 0–1.28 V) - eliminates need for external range-switching circuitry. |
| Offset Drift | <5 nV/°C (CHP = 1 mode) - ensures stable zero-point accuracy in varying ambient conditions. |
| Gain Drift | 2 ppm/°C - maintains scaling fidelity across industrial temperature range without recalibration. |
| Common-Mode Rejection | 110 dB at DC for 20 mV range - rejects noise from shared ground paths in noisy plant environments. |
| Power Supply Rejection | 110 dB at DC for 20 mV range - minimizes sensitivity to analog rail ripple in single-supply systems. |
Pinout & Package
AD7731BR-REEL7 is housed in a 24-lead SOIC_W (RW-24) package with 0.3-inch body width and standard gull-wing lead form. Pin 1 is located at top-left corner when viewed from top with marking dot oriented upper-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; controls data transfer timing for SPI-compatible 3-wire interface. |
| MCLK IN | Master clock input | Accepts 1–5 MHz crystal/resonator or external CMOS clock; 4.9152 MHz nominal for spec compliance. |
| DIN / DOUT | Serial data I/O | Half-duplex bidirectional line; supports microcontroller/DSP interfacing with POL-configurable edge timing. |
| AIN1–AIN6 | Analog input multiplexer terminals | Support three fully differential or five pseudo-differential input configurations; internally buffered. |
| REF IN(+), REF IN(–) | Differential reference input | Enables ratiometric measurement; accepts +2.5 V or +5 V nominal differential voltage per HIREF bit setting. |
| STANDBY | Power-down control | Active-low input reduces total current to ~10 µA - suitable for low-power cyclic acquisition systems. |
| SYNC | Multi-device synchronization | Resets digital filters and analog modulators across multiple AD7731 units for coherent sampling. |
Key Features
| Feature | Design Value |
|---|---|
| FASTStep™ adaptive filtering | Reduces channel-switching settling time to 1 ms while maintaining ≥13-bit p-p resolution - critical for multi-channel scan-based systems. |
| Programmable gain front end | Eliminates external op-amp gain stages for 20 mV–1.28 V sensor outputs - simplifies BOM and layout in compact modules. |
| Transducer burnout detection | Integrated ±100 nA current sources on AIN1(±) enable open-circuit fault detection without added components. |
| On-chip self/system calibration | Compensates for offset/gain drift over time and temperature - extends recalibration intervals in field-deployed equipment. |
| Dual supply operation | AVDD = +5 V, DVDD = +2.7 V to +5.25 V - allows independent digital domain optimization for noise isolation and power efficiency. |
Applications
| PLC Analog Input Module | Industrial Weigh Scale |
|---|---|
Use Scenario: High-density modular I/O card acquiring signals from load cells, RTDs, and 4–20 mA loops in factory automation cabinets. IC Role / Device Role / Timing Role: Primary ADC front end performing simultaneous gain-programmed conversion of up to six differential sensor channels with synchronized digital filtering. Use Value: 16-bit p-p resolution at 800 Hz enables sub-gram weight resolution on 100 kg platforms; FASTStep™ ensures 1 ms inter-channel settling for 10-channel scanning. |
Use Scenario: Precision benchtop or platform scale measuring mechanical strain via millivolt-level bridge outputs. IC Role / Device Role / Timing Role: Direct interface to low-output (±20 mV) Wheatstone bridges with internal PGA and ratiometric reference rejection. Use Value: <5 nV/°C offset drift prevents thermal zero-shift errors; 110 dB CMR suppresses common-mode noise from motor drives nearby. |
| Process Transmitter | Energy Meter Sensor Interface |
Use Scenario: Two-wire 4–20 mA smart transmitter converting pressure/temperature sensor outputs into HART-modulated digital output. IC Role / Device Role / Timing Role: Low-power analog front end operating in standby mode between measurements; wakes on timer interrupt for burst acquisition. Use Value: 10 µA standby current extends loop-powered operation; self-calibration maintains accuracy over 15-year field life without maintenance. |
Use Scenario: Polyphase electricity meter sensing shunt or CT-derived voltage/current waveforms with harmonic analysis capability. IC Role / Device Role / Timing Role: High-resolution ADC capturing fundamental and harmonic content with programmable filter cutoff for anti-aliasing. Use Value: Programmable digital filter allows trade-off between 6.4 kHz max update rate (for THD analysis) and enhanced noise rejection at lower rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7730BRZ | 24-bit, but only two differential inputs; no FASTStep™; fixed 1.024 V reference; higher offset drift (10 nV/°C). | Limited to dual-channel systems; lacks channel sequencing for multi-sensor scan architectures. | Select when cost-sensitive designs require basic 24-bit performance without multi-input flexibility. |
| ADS1258IPWR | 24-bit, eight differential inputs; 125 kSPS max; no integrated PGA; requires external reference and driver amplifiers. | Higher throughput but demands more external components; less suited for low-level direct transducer interfacing. | Choose for high-speed multi-channel data loggers where external signal conditioning is already present. |
Compared with AD7731BR-REEL7, AD7730BRZ offers lower integration and reduced channel agility, while ADS1258IPWR trades embedded signal conditioning for raw speed and channel count - making AD7731BR-REEL7 optimal for space-constrained, low-noise industrial front ends requiring minimal external circuitry.
Availability
AD7731BR-REEL7 is available at Aetrix Electronics and suitable for process control systems, PLC analog input modules, and industrial instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7731BR-REEL7 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 AD7731BR-REEL7 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for ruggedized industrial measurement applications demanding low drift, high CMR, and seamless transducer integration.
FAQ
What is the maximum output data rate of the AD7731BR-REEL7?
The AD7731BR-REEL7 supports programmable output rates up to 6.4 kHz in SKIP mode, where only the SINC³ filter is active. At full filtering (FIR + SINC³), the maximum rate is 800 Hz with 16-bit peak-to-peak resolution. Rate selection is configured via the Mode Register's FS0–FS2 bits and depends on master clock frequency (4.9152 MHz nominal).
Does the AD7731BR-REEL7 require an external reference voltage?
No - the AD7731BR-REEL7 accepts an external differential reference (REF IN(+) and REF IN(–)) but does not require it to be externally generated. It supports internal reference derivation from AVDD when used with appropriate decoupling, though best practice uses a dedicated low-noise +2.5 V or +5 V reference for highest accuracy. The HIREF bit selects nominal +2.5 V or +5 V reference range.
Can the AD7731BR-REEL7 interface directly with a microcontroller using only three wires?
Yes - the AD7731BR-REEL7 supports true 3-wire SPI-compatible serial communication using DIN, DOUT (shared on one line), and SCLK, with CS and POL used optionally for multi-device addressing or polarity control. Its serial interface requires no additional level-shifting for 3.3 V or 5 V microcontrollers, and RDY pin provides ready status for polling-free operation.
How does the FASTStep™ mode improve performance in multi-channel systems?
FASTStep™ mode reduces channel-switching settling time to 1 ms while preserving ≥13-bit peak-to-peak resolution - enabling rapid scanning across all six analog inputs (AIN1–AIN6) without sacrificing accuracy. This is achieved by dynamically substituting the default 22-tap FIR filter with a faster-converging adaptive filter during step transitions, then reverting to FIR for steady-state precision.
What package type is used for the AD7731BR-REEL7?
The AD7731BR-REEL7 uses a 24-lead SOIC_W (wide-body) package (package option RW-24), with 0.3-inch width, gull-wing leads, and tape-and-reel packaging (REEL7 denotes 7-inch reel). It is footprint-compatible with other AD7731 variants in SOIC_W, including AD7731BRZ-REEL7 (RoHS-compliant version).
AD7731BR-REEL7 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:
- Obsolete
- 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:
- -
AD7731BR-REEL7 FAQ
1.How can I place an order for AD7731BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7731BR-REEL7 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 AD7731BR-REEL7 reliable?
The price and inventory of AD7731BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7731BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7731BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7731BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7731BR-REEL7?
AD7731BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7731BR-REEL7 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 AD7731BR-REEL7?
For technical support, including AD7731BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7731BR-REEL7 requirements.
6.How does Aetrix verify that AD7731BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7731BR-REEL7 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 AD7731BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7731BR-REEL7?
All AD7731BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7731BR-REEL7, 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 AD7731BR-REEL7 part is unused and in its original packaging.
Return procedure for AD7731BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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