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Analog Devices Inc. AD7715AR-3REEL
- Part No.:
- AD7715AR-3REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7715AR-3REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:127,049
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Product details
Overview
AD7715AR-3REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter optimized for low-frequency, high-precision transducer interfacing. It features a programmable gain amplifier (gains 1/2/32/128), differential analog and reference inputs, and operates at 3 V with 450 µA max supply current. Used in strain gauge and RTD measurement front ends where resolution, noise rejection, and single-supply operation are critical.
For engineers reviewing the AD7715AR-3REEL datasheet, AD7715AR-3REEL pinout, AD7715AR-3REEL application, or AD7715AR-3REEL equivalent, key selection criteria include its 16-bit no-missing-codes performance, ±0.0015% integral nonlinearity, 50 Hz/60 Hz notch filter programmability, and three-wire SPI-compatible serial interface for microcontroller integration.
Technical Context
The AD7715AR-3REEL implements a charge-balancing sigma-delta architecture with on-chip digital filtering, enabling up to 16-bit no-missing-codes resolution. Its first digital filter notch is software-programmable to set output update rates and reject line-frequency interference at 50 Hz or 60 Hz.
It integrates a buffered or unbuffered differential input stage, selectable via the BUF bit, and supports both unipolar (0 mV to 20 mV, 0 V to 1.25 V) and bipolar (±20 mV, ±1.25 V) input ranges referenced to AGND. The device uses a 1.25 V reference (REF IN(+) − REF IN(−)) and accepts master clock frequencies from 400 kHz to 2.4576 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes guaranteed - ensures monotonicity and full code coverage across full-scale range |
| Integral Nonlinearity | ±0.0015% of FSR - enables high-accuracy DC measurements without post-conversion linearization |
| Supply Voltage | 3 V AVDD/DVDD - supports battery-powered and low-voltage industrial systems |
| Supply Current | 450 µA max @ 3 V - allows continuous operation in power-constrained sensor nodes |
| Input Configuration | Differential AIN(+)/AIN(–) with programmable PGA - directly digitizes low-level transducer outputs without external amplification |
| Reference Input | 1.25 V differential (REF IN(+) − REF IN(−)) - matches internal scaling for optimal SNR at 3 V operation |
| Filter Notch Programmability | Selectable 20 Hz, 25 Hz, 50 Hz, or 60 Hz - eliminates mains-induced noise in industrial environments |
Pinout & Package
AD7715AR-3REEL is housed in a 16-lead SOIC_W (0.3 inch wide) package, RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Controls timing of data transfer on DIN/DOUT; compatible with SPI, QSPI, MICROWIRE, and DSP interfaces |
| DOUT | Serial data output | Three-state output delivering conversion results and register contents; driven only when CS is low and SCLK active |
| DIN | Serial data input | Accepts configuration commands (setup, communications, test registers) and calibration triggers |
| CS | Chip select | Active-low enable for serial interface; must be asserted before SCLK to initiate communication |
| DRDY | Data ready indicator | Open-drain output signaling valid conversion result; used for interrupt-driven or polled read synchronization |
| RESET | Hardware reset | Asynchronous active-low signal that clears all registers and restarts calibration sequence |
| MCLK IN / MCLK OUT | Master clock oscillator terminals | Support crystal/resonator connection (across pins 2 & 3) or external CMOS clock feed to MCLK IN only |
| AIN(+), AIN(–) | Differential analog input | High-impedance inputs accepting ±20 mV to ±1.25 V ranges; common-mode voltage limited to AGND–AVDD |
| REF IN(+), REF IN(–) | Differential reference input | Defines full-scale range; requires 1.25 V nominal differential voltage for AD7715AR-3REEL |
| AVDD, DVDD | Analog/digital supply | Both powered from 3 V; separation minimizes digital noise coupling into analog path |
| AGND, DGND | Analog/digital ground | Separate ground planes required; connected at single point near AVDD/DVDD decoupling capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Amplifier | Gains of 1, 2, 32, or 128 eliminate need for external signal conditioning stages when interfacing millivolt-level sensors |
| On-Chip Calibration | Self-calibration and system calibration modes remove offset and gain errors without external precision components |
| Low-Power Standby Mode | 10 µA typical standby current enables rapid wake-up in duty-cycled measurement systems |
| 50/60 Hz Rejection | 98 dB normal-mode and 150 dB common-mode rejection at line frequency - critical for stable readings in noisy plant environments |
| Three-Wire Serial Interface | Reduces interconnect count and optocoupler requirements in isolated systems, simplifying PCB layout and cost |
Applications
| Strain Gauge Load Cell Interface | RTD Temperature Measurement |
|---|---|
Use Scenario: Digitizing mV-level bridge output from metallic foil strain gauges in industrial weighing and structural monitoring. IC Role / Device Role / Timing Role: ADC front end performing PGA gain selection, sigma-delta conversion, and digital filtering to suppress 50/60 Hz interference. Use Value: Achieves 16-bit resolution with ±0.0015% INL while operating from 3 V, eliminating external op-amps and reference buffers. | Use Scenario: Measuring resistance of Pt100/1000 RTDs in HVAC and process control transmitters with 0.1°C accuracy. IC Role / Device Role / Timing Role: Precision ADC with programmable gain and differential reference handling direct 4-wire RTD excitation and sensing. Use Value: Uses internal 1.25 V reference and bipolar input mode to resolve sub-millivolt ΔR changes without external instrumentation amps. |
| Smart Pressure Transmitter | Low-Power Battery Sensor Node |
Use Scenario: Converting piezoresistive pressure sensor output in HART-enabled field instruments with loop-powered 4–20 mA output. IC Role / Device Role / Timing Role: Primary analog front-end ADC providing high-resolution digitization, self-calibration, and serial data output for microcontroller processing. Use Value: Delivers 16-bit no-missing-codes performance at 450 µA supply current, enabling full functionality within 3.5 mA loop budget. | Use Scenario: Ultra-low-power environmental monitoring using thermistors or MEMS sensors in wireless IoT endpoints. IC Role / Device Role / Timing Role: Low-power ADC with standby mode and configurable update rate for adaptive sampling strategies. Use Value: Reduces average current to <5 µA in sleep-then-measure cycles while maintaining 16-bit fidelity during active conversion windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714AR-3 | 5-channel multiplexed input vs. single channel; identical 16-bit sigma-delta core, 3 V supply, and 450 µA current | Supports multi-sensor systems requiring sequential channel scanning; lacks dedicated DRDY pin per channel | Choose AD7714AR-3 when measuring multiple transducers with shared timing constraints and board space efficiency is prioritized |
| ADS1248IPWR | 24-bit resolution, integrated PGA (1–128), but higher 1.3 mA supply current and 5 V min supply requirement | Better resolution for ultra-high-precision lab equipment; not suitable for 3 V battery operation | Choose ADS1248IPWR when absolute accuracy >16 bits is mandatory and power budget allows >1 mA continuous draw |
Compared with AD7715AR-3REEL, AD7714AR-3 offers input multiplexing at identical power and resolution, while ADS1248IPWR trades higher current and voltage requirements for 24-bit resolution-making AD7715AR-3REEL optimal for cost-sensitive, single-channel, 3 V embedded systems demanding proven 16-bit stability.
Availability
AD7715AR-3REEL is available at Aetrix Electronics and suitable for industrial sensor interfaces, smart transmitter designs, and low-power embedded measurement systems requiring stable component supply and long-term manufacturability.
Supply support for AD7715AR-3REEL 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.
The AD7715 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency, high-resolution transducer signal acquisition in harsh electrical environments.
FAQ
What is the maximum recommended master clock frequency for AD7715AR-3REEL?
The AD7715AR-3REEL is production-tested at 2.4576 MHz and guaranteed by characterization to operate up to 2.5 MHz. For reliable performance with specified timing margins, Analog Devices recommends limiting fCLKIN to ≤2.4576 MHz. Operation below 400 kHz is also supported but reduces output data rate proportionally.
Does AD7715AR-3REEL support both unipolar and bipolar input configurations?
Yes, AD7715AR-3REEL supports both unipolar (e.g., 0 mV to 20 mV, 0 V to 1.25 V) and bipolar (e.g., ±20 mV, ±1.25 V) input ranges. Selection is controlled by the B/U bit in the setup register. Bipolar ranges are referenced to AIN(–), and the device maintains ±0.0015% integral nonlinearity in both modes.
How does the programmable digital filter notch affect AD7715AR-3REEL's output update rate?
The AD7715AR-3REEL's first digital filter notch determines its output update rate: selecting 20 Hz yields ~20 SPS, 25 Hz yields ~25 SPS, 50 Hz yields ~50 SPS, and 60 Hz yields ~60 SPS. Update rate scales inversely with notch frequency and is independent of PGA gain setting.
Can AD7715AR-3REEL operate with an external reference other than 1.25 V?
Yes, AD7715AR-3REEL functions with external references down to 1.0 V (±1% tolerance for specified performance). However, using the nominal 1.25 V reference ensures optimal full-scale range mapping, noise performance, and compliance with datasheet specifications including ±0.0015% INL and 16-bit no-missing-codes guarantee.
What is the purpose of the BUF bit in the AD7715AR-3REEL setup register?
The BUF bit enables or disables the internal analog input buffer. When BUF = 1, the buffer provides high input impedance (>1 GΩ) and allows common-mode voltage up to AVDD − 1.5 V, supporting direct connection to high-impedance sources like thermistors. When BUF = 0, input impedance drops to ~10 kΩ, reducing power consumption but requiring low-impedance driving sources.
AD7715AR-3REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7715AR-3REEL FAQ
1.How can I place an order for AD7715AR-3REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7715AR-3REEL 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 AD7715AR-3REEL reliable?
The price and inventory of AD7715AR-3REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7715AR-3REEL is usually 5 days.
3.What payment methods are accepted for AD7715AR-3REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7715AR-3REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7715AR-3REEL?
AD7715AR-3REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7715AR-3REEL 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 AD7715AR-3REEL?
For technical support, including AD7715AR-3REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7715AR-3REEL requirements.
6.How does Aetrix verify that AD7715AR-3REEL is sourced from the original manufacturer or authorized distributors?
All AD7715AR-3REEL 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 AD7715AR-3REEL meets industry standards.
7.What is the process for return or replacement of AD7715AR-3REEL?
All AD7715AR-3REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7715AR-3REEL, 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 AD7715AR-3REEL part is unused and in its original packaging.
Return procedure for AD7715AR-3REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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