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Analog Devices Inc. AD7712ARZ-REEL
- Part No.:
- AD7712ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7712ARZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,302
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Product details
Overview
AD7712ARZ-REEL from Analog Devices is a 24-bit sigma-delta analog-to-digital converter (ADC) with dual analog input channels, programmable gain amplifier (PGA) up to 128×, integrated 2.5 V reference, and on-chip digital filtering. It delivers ±0.0015% integral nonlinearity, 100 dB 50/60 Hz rejection, and operates from single or dual supplies (AVDD = 5–10 V, VSS = 0 or –5 V). It is used in high-accuracy industrial sensor signal conditioning for strain gage and smart transmitter interfaces.
For engineers reviewing the AD7712ARZ-REEL datasheet, AD7712ARZ-REEL pinout, AD7712ARZ-REEL application, or AD7712ARZ-REEL equivalent, key selection considerations include differential low-level input capability, system/self/background calibration support, filter notch programmability (10–500 Hz), 24-bit no-missing-codes performance at ≤60 Hz notch, and SOIC-24 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The AD7712ARZ-REEL employs a charge-balancing sigma-delta modulator with auto-zeroed architecture and a programmable digital filter whose first notch frequency is set via the control register (10 Hz to 500 Hz). It supports two distinct analog input paths: AIN1(±) accepts differential low-level signals (±VREF/GAIN) with PGA gains of 1–128, while AIN2 accepts high-level unipolar/bipolar inputs (±4 VREF/GAIN) via an internal resistor attenuator.
Its bidirectional serial interface (SCLK, SDATA, RFS, TFS, MODE, A0) enables microcontroller-based configuration of channel selection, gain, polarity, filter cutoff, and calibration modes. The device integrates self-calibration, system calibration, and background calibration functions, and allows full read/write access to on-chip calibration registers for precise field adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24 bits no missing codes (guaranteed ≤60 Hz filter notch); usable 23-bit dynamic range |
| Integral Nonlinearity | ±0.0015% FSR max (≤60 Hz notch); eliminates need for external linearity correction |
| 50/60 Hz Rejection | 100 dB min (normal-mode); enables accurate measurement in noisy industrial AC environments |
| PGA Gain Range | 1 to 128 (programmable per channel); supports direct connection to mV-level transducers without external amplification |
| Reference | Internal 2.5 V ±1% initial tolerance; 20 ppm/°C drift; eliminates need for external reference in cost-sensitive designs |
| Power Dissipation | 25 mW typical (normal mode); 100 µW typical (standby); suitable for battery-powered portable instruments |
| Input Channels | Dual: AIN1(±) differential low-level (±VREF/GAIN), AIN2 single-ended high-level (±4 VREF/GAIN) |
Pinout & Package
AD7712ARZ-REEL is housed in a 24-lead SOIC (RW-24) package, 0.3 inch wide, RoHS-compliant, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock I/O | Configurable as input (external clocking) or output (self-clocking); synchronizes serial data transfers |
| 4 (A0) | Address select | Low = control register access; high = data/calibration register access; enables full register-level configuration |
| 7 (AIN1(+)) / 8 (AIN1(–)) | Differential low-level analog input | Accepts ±VREF/GAIN signals; includes transducer burnout current source (4.5 µA) for open-wire detection |
| 17 (AIN2) | High-level analog input | Accepts ±4 VREF/GAIN (e.g., ±10 V at VREF = 2.5 V, GAIN = 1); uses internal resistor attenuator |
| 14 (REF IN(–)) / 15 (REF IN(+)) | Differential reference input | Supports 2.5–5 V external reference; enables ratiometric or absolute measurement configurations |
| 16 (REF OUT) | Internal reference output | 2.5 V ±1% output; drives external circuitry or serves as AIN2 reference; 1 mA max load |
| 9 (STANDBY) | Hardware power-down control | Active-low pin reduces supply current to 100 µW typical; faster wake-up than software standby |
| 21 (DRDY) | Data ready indicator | Falling edge signals valid conversion result; also indicates completion of on-chip calibration sequences |
Key Features
| Feature | Design Value |
|---|---|
| Programmable digital filter notch | Adjustable first-notch frequency (10–500 Hz) enables optimized settling time and noise rejection per application |
| On-chip calibration registers | Full read/write access allows microcontroller-driven system calibration and field recalibration without hardware change |
| Dual-input architecture | Simultaneous support for low-level transducer (AIN1) and high-level process voltage (AIN2) inputs simplifies multi-sensor front ends |
| Transducer burnout detection | Integrated 4.5 µA current source on AIN1(+) enables open-circuit fault detection in strain gage or RTD bridges |
| Single/dual-supply flexibility | VSS tied to AGND enables true single-supply operation; negative VSS extends AIN1 common-mode range to –VREF |
Applications
| Strain Gage-Based Load Cell Interface | Smart 4–20 mA Transmitter |
|---|---|
|
Use Scenario: Direct digitization of millivolt-level output from Wheatstone bridge load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Signal conditioning ADC providing PGA gain (up to 128×), 24-bit resolution, and 100 dB 50/60 Hz rejection to suppress mains interference. Use Value: Eliminates external instrumentation amplifier and external reference; reduces BOM count and layout area while maintaining ±0.0015% linearity. |
Use Scenario: High-accuracy analog input stage for HART-enabled 4–20 mA loop-powered transmitters measuring pressure, temperature, or flow. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring both primary sensor (AIN1) and diagnostic/reference (AIN2) signals with synchronized calibration. Use Value: Enables simultaneous sensor reading and self-test; background calibration maintains accuracy over temperature without interrupting loop operation. |
| Portable Battery-Powered DMM | Industrial Process Controller Input Module |
|
Use Scenario: Precision DC voltage and resistance measurement in handheld digital multimeters with auto-ranging capability. IC Role / Device Role / Timing Role: Configurable ADC supporting unipolar/bipolar ranges, programmable filter notches, and low-power standby mode. Use Value: 25 mW typical power enables >10-hour battery life; 100 µW standby extends shelf life; 24-bit resolution supports 6½-digit display accuracy. |
Use Scenario: Analog input card in PLC or DCS accepting multiple sensor types (thermocouple, RTD, 0–10 V) with channel isolation and diagnostics. IC Role / Device Role / Timing Role: High-integrity front-end ADC with system calibration, burnout detection, and robust EMI immunity per IEC 61000-4 standards. Use Value: Reduces need for external protection and signal conditioning; built-in 50/60 Hz rejection meets industrial EMC requirements without additional filtering. |
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 |
|---|---|---|---|
| AD7730BRUZ | 24-bit, single-channel, higher throughput (1.2 kSPS vs. AD7712's ~100 SPS at 60 Hz notch), no internal reference | Optimized for fast, single-sensor systems requiring lower latency; lacks dual-input flexibility and integrated 2.5 V reference | Select when speed > resolution stability; requires external reference and separate channel multiplexing for multi-sensor use |
| ADS1258IPWR | 24-bit, 8-channel, 125 kSPS, integrated oscillator, no PGA, external reference required | Targets high-channel-count data acquisition with multiplexed inputs; lacks programmable filter notch and burnout detection | Select for dense sensor arrays where channel count and speed outweigh need for on-chip PGA and diagnostics |
Compared with AD7712ARZ-REEL, AD7730BRUZ trades dual-input capability and integrated reference for higher speed, while ADS1258IPWR offers massive channel density but requires external signal conditioning and reference - making AD7712ARZ-REEL uniquely suited for low-channel, ultra-stable industrial sensor interfaces demanding minimal external components.
Availability
AD7712ARZ-REEL is available at Aetrix Electronics and suitable for process control systems, smart transmitter manufacturing, and portable industrial instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7712ARZ-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 and manufacturing expertise spanning precision data conversion, power management, and RF technologies.
The AD7712ARZ-REEL belongs to Analog Devices' LC2MOS precision sigma-delta ADC product line, engineered specifically for low-frequency, high-accuracy industrial measurement applications including strain gage, RTD, and thermocouple signal conditioning.
FAQ
What is the maximum guaranteed resolution of the AD7712ARZ-REEL under industrial 50/60 Hz noise conditions?
The AD7712ARZ-REEL guarantees 24-bit no missing codes performance when the digital filter's first notch is set to ≤60 Hz - delivering true 23-bit dynamic range with ±0.0015% integral nonlinearity. At 100 Hz notch, resolution degrades to 22 bits; at 500 Hz, it falls to 15 bits. This trade-off between speed and resolution is inherent to sigma-delta architecture and must be selected per application noise environment.
Does the AD7712ARZ-REEL support true differential input on both analog channels?
The AD7712ARZ-REEL supports true differential input only on AIN1(±); AIN2 is a single-ended input referenced to AGND. However, AIN1(±) provides full differential operation with programmable gain, common-mode rejection ≥100 dB, and dedicated burnout current sourcing on AIN1(+). AIN2 accepts high-level signals (±4 VREF/GAIN) via an internal attenuator but does not offer differential sensing capability.
Can the AD7712ARZ-REEL operate from a single 5 V supply without external level-shifting?
Yes - the AD7712ARZ-REEL supports single-supply operation by tying VSS to AGND. In this configuration, AIN1(±) inputs must remain > –30 mV relative to VSS, and AVDD = 5 V ±5% is required. The internal 2.5 V reference (REF OUT) and digital interface (DVDD = 5 V) align naturally, eliminating need for external level shifters or negative rails in many portable and board-level applications.
How does the AD7712ARZ-REEL handle calibration in field-deployed equipment?
The AD7712ARZ-REEL supports three calibration modes: self-calibration (zero/full-scale correction using internal references), system calibration (using external known voltages), and background calibration (continuous zero correction during normal operation). All modes allow full read/write access to on-chip calibration registers via its serial interface - enabling microcontroller-driven field recalibration without hardware intervention or factory return.
What is the function of the VBIAS pin on the AD7712ARZ-REEL, and how should it be configured?
The VBIAS pin sets the common-mode bias point for the internal analog modulator. It must satisfy VSS + 0.85×VREF ≤ VBIAS ≤ AVDD – 0.85×VREF. Recommended configurations: tie to REF OUT (2.5 V) for AVDD = +5 V/VSS = 0 V; tie to AGND for AVDD = +5 V/VSS = –5 V; tie to +5 V for AVDD = +10 V/VSS = 0 V. Incorrect VBIAS causes gain error and reduced CMR.
AD7712ARZ-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):
- 1k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V ~ 10V
- Voltage - Supply, Digital:
- 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7712ARZ-REEL FAQ
1.How can I place an order for AD7712ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7712ARZ-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 AD7712ARZ-REEL reliable?
The price and inventory of AD7712ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7712ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7712ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7712ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7712ARZ-REEL?
AD7712ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7712ARZ-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 AD7712ARZ-REEL?
For technical support, including AD7712ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7712ARZ-REEL requirements.
6.How does Aetrix verify that AD7712ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7712ARZ-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 AD7712ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7712ARZ-REEL?
All AD7712ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7712ARZ-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 AD7712ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7712ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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