My Inquiry
My Account
Analog Devices Inc. AD7731BRZ-REEL7
- Part No.:
- AD7731BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7731BRZ-REEL7.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,959
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7731BRZ-REEL7 from Analog Devices is a 24-bit sigma-delta analog-to-digital converter optimized for high-precision industrial process control. It integrates a programmable-gain amplifier (PGA), buffered differential inputs, a programmable digital filter, and self-calibration logic. Key confirmed parameters include 16-bit peak-to-peak resolution at 800 Hz output rate, ±20 mV to ±1.28 V bipolar input ranges, <5 nV/°C offset drift, and 2 ppm/°C gain drift - enabling direct transducer interfacing in PLCs and weigh-scale systems.
For engineers reviewing the AD7731BRZ-REEL7 datasheet, AD7731BRZ-REEL7 pinout, AD7731BRZ-REEL7 application, or AD7731BRZ-REEL7 equivalent, this page delivers verified technical context, real-world timing and noise performance, channel sequencing behavior in FASTStep™ mode, and precise calibration architecture details required for embedded sensor front-end design.
Technical Context
The AD7731BRZ-REEL7 implements a two-stage digital filter: a configurable SINC³ modulator followed by either a 22-tap FIR filter (default) or FASTStep™ adaptive filter for rapid step-response settling. Its analog path includes a chopper-stabilized PGA with six programmable gain settings and on-chip 100 nA burnout currents for open-transducer detection.
It supports three-wire SPI-compatible serial communication with polarity-selectable clock (POL pin), synchronous multi-device operation via SYNC, and dual-mode reference input (2.5 V or 5 V). The device operates from a single +5 V AVDD supply and accepts DVDD from +2.7 V to +5.25 V, with standby current as low as 10 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes architecture ensures monotonicity across full scale - critical for closed-loop control integrity. |
| Peak-to-Peak Resolution | 16 bits at 800 Hz output rate - enables high dynamic range measurement of slow-varying industrial signals. |
| Input Ranges | Seven unipolar (0 to +1.28 V) and seven bipolar (±1.28 V) ranges - selectable via RN2–RN0 bits for direct transducer compatibility. |
| Offset Drift | <5 nV/°C (CHP = 1 mode) - eliminates manual recalibration in temperature-varying factory environments. |
| Gain Drift | 2 ppm/°C typ - maintains accuracy over wide ambient ranges without external gain compensation. |
| Common-Mode Rejection | 110 dB at DC (20 mV range) - rejects noise from shared ground paths in noisy plant-floor wiring. |
| Power Supply Rejection | 110 dB at DC (20 mV range) - tolerates ripple on AVDD without degrading effective resolution. |
Pinout & Package
AD7731BRZ-REEL7 is housed in a 24-lead SOIC_W package (RW-24), RoHS-compliant, with 0.3-inch body width and standard JEDEC MS-013 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; determines data transfer timing for SPI/DSP interface - idle state depends on POL setting. |
| MCLK IN / MCLK OUT | Master clock oscillator interface | Supports crystal (4.9152 MHz nominal) or external CMOS clock; MCLK OUT provides inverted clock for system sync. |
| AIN1–AIN6 | Differential analog input channels | Three fully differential pairs or five pseudo-differential inputs; AIN3/D1 and AIN4/D0 are reconfigurable as GPIOs. |
| REF IN(+), REF IN(–) | Differential reference input | Accepts 2.5 V or 5 V nominal reference; built-in NO REF detection flags open/shorted reference conditions. |
| SYNC, RESET, STANDBY | System control inputs | SYNC synchronizes multiple AD7731BRZ-REEL7 units; RESET forces full register reset; STANDBY reduces current to ~10 µA. |
| DIN, DOUT, CS, RDY, POL | Serial interface control | Three-wire SPI-compatible interface; RDY indicates conversion completion; POL selects active clock edge for microcontroller alignment. |
Key Features
| Feature | Design Value |
|---|---|
| FASTStep™ adaptive filtering | Reduces channel-switching settling time to 1 ms while preserving 13-bit p-p resolution - essential for multiplexed multi-sensor systems. |
| On-chip burnout current sources | 100 nA matched current sources on AIN1(+) and AIN1(–) enable automatic open-circuit detection in 4–20 mA loop sensors. |
| Programmable gain amplifier (PGA) | Configurable gain from 1× to 128× across seven input ranges - eliminates external signal conditioning for millivolt-level transducers. |
| Self- and system calibration | Internal zero- and full-scale calibration reduces offset error to ~3 µV and gain error to <100 ppm - cuts factory calibration time and cost. |
| Chopper-stabilized analog path | CHP = 1 mode enables sub-5 nV/°C offset drift - sustains accuracy in uncontrolled thermal environments like motor control cabinets. |
Applications
| PLC Analog Input Module | Weigh-Scale Front End |
|---|---|
Use Scenario: High-density modular I/O card acquiring signals from pressure, temperature, and flow transducers in distributed control systems. IC Role / Device Role / Timing Role: Primary ADC with integrated PGA and digital filtering - handles up to six differential channels with synchronized sampling. Use Value: Eliminates external instrumentation amplifiers and anti-alias filters, reducing BOM count and board area by >30% versus discrete solutions. |
Use Scenario: Precision load-cell interface in platform scales and hopper dosing systems requiring 1:10,000+ resolution. IC Role / Device Role / Timing Role: Low-noise 24-bit ADC with chopper stabilization and burnout detection - directly digitizes mV-level bridge outputs. Use Value: Achieves 16-bit p-p resolution at 800 Hz without external zero-drift op-amps, enabling Class III legal-for-trade certification. |
| Industrial Temperature Monitor | Process Transmitter Interface |
Use Scenario: DIN-rail mounted RTD/thermocouple transmitter converting sensor voltage to 4–20 mA output with HART modulation. IC Role / Device Role / Timing Role: High-accuracy analog front end with ratiometric reference support - referenced to same excitation source as RTD. Use Value: 110 dB CMRR and PSRR suppress common-mode noise from 24 V DC field power, ensuring stable readings in electrically hostile zones. |
Use Scenario: Smart transmitter electronics for pressure or level sensing in oil & gas refineries, operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Robust sigma-delta ADC with 2 ppm/°C gain drift and -40°C to +85°C rated operation - core of loop-powered design. Use Value: Maintains calibration stability over full temperature range without periodic field recalibration, reducing maintenance cycles by 60%. |
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, single-channel, no PGA, fixed 2.5 V reference only - lacks programmable gain and multi-input mux. | Best suited for single-sensor, fixed-range applications where external signal conditioning is already present. | Select AD7730BRZ only when channel count and input flexibility are not required - AD7731BRZ-REEL7 offers superior integration for multi-transducer systems. |
| ADS1258IPWR | 24-bit, 8-channel, 10 kSPS max, internal oscillator - no burnout current, lower CMRR (100 dB), no FASTStep™ mode. | Targeted at higher-speed data acquisition where fast settling is less critical than channel density. | Choose ADS1258IPWR for throughput-focused designs; AD7731BRZ-REEL7 remains preferred for ultra-low-drift, transducer-integrated industrial control. |
Compared with AD7730BRZ and ADS1258IPWR, AD7731BRZ-REEL7 uniquely combines programmable gain, FASTStep™ channel switching, on-chip burnout detection, and <5 nV/°C offset drift - making it the only option qualified for precision multiplexed transducer interfaces in harsh industrial environments.
Availability
AD7731BRZ-REEL7 is available at Aetrix Electronics and suitable for PLC analog input modules, weigh-scale front ends, industrial temperature monitors, and process transmitter interfaces requiring stable component supply across extended product lifecycles.
Supply support for AD7731BRZ-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 AD7731BRZ-REEL7 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for ruggedized process control and instrumentation applications demanding low drift, high CMRR, and integrated transducer interface capability.
FAQ
What is the maximum output data rate supported by the AD7731BRZ-REEL7?
The AD7731BRZ-REEL7 supports programmable output rates up to 6.4 kHz in SKIP mode, where only the SINC³ filter is active. At full filtering (FIR enabled), the maximum rate is 800 Hz with 16-bit peak-to-peak resolution. Rate selection is controlled via the FILTER register and affects both noise performance and settling time - critical for optimizing throughput versus precision in AD7731BRZ-REEL7-based systems.
Does the AD7731BRZ-REEL7 require an external reference voltage?
No, the AD7731BRZ-REEL7 accepts an external differential reference but does not require one - it operates ratiometrically using its own internal reference if configured. However, for highest accuracy, a stable 2.5 V or 5 V external reference is recommended. The HIREF bit selects between +2.5 V (HIREF = 0) and +5 V (HIREF = 1) nominal reference voltage, and the AD7731BRZ-REEL7 includes NO REF detection to flag invalid reference conditions.
How does the FASTStep™ mode improve channel switching in the AD7731BRZ-REEL7?
FASTStep™ mode reduces channel-switching settling time to 1 ms while maintaining 13-bit peak-to-peak resolution - achieved by dynamically substituting the default 22-tap FIR filter with a faster-converging adaptive filter during step transitions. This behavior is automatically triggered upon input step detection and is exclusive to the AD7731BRZ-REEL7 within its product family, enabling high-speed multiplexed measurements without sacrificing accuracy.
Can the AD7731BRZ-REEL7 operate from a single 3.3 V supply?
The AD7731BRZ-REEL7 requires AVDD = +5 V (±5%) for analog circuitry; DVDD may be +2.7 V to +5.25 V, supporting 3.3 V logic. Therefore, a single 3.3 V rail cannot power the AD7731BRZ-REEL7 fully - AVDD must be 5 V. Using 3.3 V for DVDD is valid and commonly done to interface with 3.3 V microcontrollers, but AVDD remains strictly 5 V per absolute maximum ratings and functional specifications of the AD7731BRZ-REEL7.
What calibration options are available on the AD7731BRZ-REEL7?
The AD7731BRZ-REEL7 provides self-calibration (zero- and full-scale) and system calibration modes. Internal zero-scale calibration reduces offset error to ~3 µV; full-scale calibration cuts gain error to <100 ppm on most ranges. System calibration further reduces errors to noise floor levels. All calibrations are initiated via register writes and require no external equipment - a key advantage for field-upgradable AD7731BRZ-REEL7 installations.
AD7731BRZ-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:
- 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-REEL7 FAQ
1.How can I place an order for AD7731BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7731BRZ-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 AD7731BRZ-REEL7 reliable?
The price and inventory of AD7731BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7731BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7731BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7731BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7731BRZ-REEL7?
AD7731BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7731BRZ-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 AD7731BRZ-REEL7?
For technical support, including AD7731BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7731BRZ-REEL7 requirements.
6.How does Aetrix verify that AD7731BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7731BRZ-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 AD7731BRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7731BRZ-REEL7?
All AD7731BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7731BRZ-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 AD7731BRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7731BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7731BRZ-REEL7 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
