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Analog Devices Inc. AD7715ARU-3REEL7
- Part No.:
- AD7715ARU-3REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7715ARU-3REEL7.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,423
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Product details
Overview
AD7715ARU-3REEL7 from Analog Devices is a 16-bit sigma-delta analog-to-digital converter (ADC) optimized for low-frequency, high-precision measurement of transducer-level signals. It integrates a programmable gain amplifier (gains 1/2/32/128), differential analog and reference inputs, on-chip digital filtering with programmable notch frequency, and a three-wire SPI-compatible serial interface. It operates from a single 3 V supply with 450 µA max current and supports unipolar (0–2.5 V) or bipolar (±2.5 V) input ranges - ideal for strain gauge and RTD-based industrial sensor front ends.
For engineers reviewing the AD7715ARU-3REEL7 datasheet, AD7715ARU-3REEL7 pinout, AD7715ARU-3REEL7 application, or AD7715ARU-3REEL7 equivalent, key selection criteria include its guaranteed 16-bit no-missing-codes performance, ±0.0015% integral nonlinearity, 98 dB 50/60 Hz normal-mode rejection, self/system calibration capability, and TSSOP-16 package compatibility with space-constrained embedded systems.
Technical Context
The AD7715ARU-3REEL7 employs a charge-balancing sigma-delta modulator architecture with an on-chip digital filter whose first notch frequency is software-programmable (e.g., 20 Hz, 25 Hz, 50 Hz, 60 Hz). Its analog front end includes a rail-to-rail input buffer (configurable via BUF bit), differential PGA, and independent AGND/DGND separation to minimize digital noise coupling into precision analog paths.
It uses a synchronous three-wire serial interface (SCLK, DIN, DOUT, CS) compatible with SPI, QSPI, MICROWIRE, and DSP protocols. The DRDY output signals data readiness, while RESET and MCLK IN/MCLK OUT support flexible clocking - including crystal oscillator mode (MCLK IN/MCLK OUT pins) or external CMOS clock (MCLK IN only).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage over temperature for precision measurement applications. |
| Integral Nonlinearity | ±0.0015% of FSR - enables high-accuracy weight scales and pressure sensors without post-conversion linearization. |
| Supply Current | 450 µA max @ 3 V - allows battery-powered or energy-harvested sensor nodes to operate continuously with minimal power budget impact. |
| Input Rejection | 98 dB at 50/60 Hz - eliminates mains interference in industrial environments without external notch filters. |
| Programmable Gain | Gains of 1, 2, 32, 128 - permits direct connection of mV-range transducers (e.g., 20 mV full-scale load cells) without external amplification. |
| Reference Input | 1.25 V nominal (AD7715-3 variant) - matches internal reference tolerance and simplifies design with low-drift external references or ratiometric sensor configurations. |
| Update Rate | Programmable via digital filter notch - supports 10–100 Hz output rates for dynamic process monitoring or slow-sampling environmental logging. |
Pinout & Package
AD7715ARU-3REEL7 is housed in a 16-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad for thermal enhancement. Pin 1 marked by dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock input | Controls timing of all serial read/write operations; supports continuous or burst clocking up to 2.4576 MHz. |
| 2 (MCLK IN) | Master clock input | Accepts external CMOS clock or crystal/resonator leg; determines conversion speed and filter timing resolution. |
| 3 (MCLK OUT) | Master clock output | Drives crystal/resonator in oscillator mode; left floating when using external clock source. |
| 4 (CS) | Chip select input | Active-low enable for serial interface; allows multiple AD7715 devices on shared SCLK/DIN/DOUT bus. |
| 5 (REF IN(+)) | Positive reference input | Accepts 1.25 V reference for AD7715-3; defines full-scale range and enables ratiometric measurements. |
| 6 (AGND) | Analog ground | Separate ground return for analog circuitry; must be tied to system analog ground with low-impedance path. |
| 7 (DRDY) | Data ready output | Open-drain active-low signal indicating valid conversion result available in data register. |
| 8 (RESET) | Hardware reset input | Asynchronous active-low reset that clears registers and restarts calibration sequence. |
| 9 (AVDD) | Analog supply | 3 V ±10% supply for analog section; decoupling capacitor required near pin for noise immunity. |
| 10 (AIN(+)) | Differential analog input (+) | High-impedance input (1 nA bias) accepting buffered/unbuffered differential signals up to AVDD − 1.5 V. |
| 11 (AIN(−)) | Differential analog input (−) | Completes differential pair; common-mode voltage referenced to AIN(−) for bipolar operation. |
| 12 (REF IN(−)) | Negative reference input | Ground reference for 1.25 V reference; must tie to AGND for standard operation. |
| 13 (DGND) | Digital ground | Separate ground return for digital I/O; connected to AGND at single point to avoid ground loops. |
| 14 (DVDD) | Digital supply | 3 V ±10% supply for digital interface; compatible with 3.3 V microcontrollers without level shifters. |
| 15 (DIN) | Serial data input | Writes configuration bits to setup, communications, or test registers; MSB-first, 8-bit or 16-bit frames. |
| 16 (DOUT) | Serial data output | Reads conversion results or register contents; tri-state controlled by CS and SCLK edge timing. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Eliminates zero-scale and full-scale errors without external equipment; reduces production test time and BOM count. |
| Differential input + reference | Rejects common-mode noise and enables true ratiometric sensing with bridge transducers or RTDs. |
| Buffered analog input option | Enables high-impedance sensor interfaces (e.g., thermocouples) without external op-amps or loading errors. |
| Low-power standby mode | Reduces current to 10 µA typical at 3.3 V - extends battery life in intermittent-read sensor nodes. |
| Three-wire serial interface | Minimizes PCB routing and isolation components in safety-critical or high-noise industrial systems. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
|
Use Scenario: Digital pressure transmitter for HVAC duct static pressure sensing with 0–100 Pa range and 0.1 Pa resolution. IC Role / Device Role / Timing Role: ADC front end digitizing mV-level Wheatstone bridge output from piezoresistive sensor; performs gain scaling, filtering, and self-calibration. Use Value: 16-bit no-missing-codes resolution and 98 dB 50/60 Hz rejection ensure stable readings in electrically noisy building environments without external filtering. |
Use Scenario: Industrial RTD temperature node measuring –50°C to +200°C with Pt100 sensor in 4-wire configuration. IC Role / Device Role / Timing Role: Precision ADC converting ratiometric voltage across RTD; uses internal 1.25 V reference and programmable gain to resolve <10 mΩ resistance changes. Use Value: ±0.0015% INL and 0.2 µV/°C offset drift enable Class A RTD accuracy per IEC 60751 without firmware compensation. |
| Smart Transmitter | Weigh Scale Front End |
|
Use Scenario: HART-enabled 4–20 mA smart transmitter for flow metering with onboard diagnostics and calibration storage. IC Role / Device Role / Timing Role: Primary ADC acquiring sensor signal; communicates via three-wire interface to host MCU handling HART modulation and EEPROM calibration data. Use Value: Integrated digital filter with programmable update rate (10–100 Hz) supports both fast loop control and low-noise averaging modes in same hardware. |
Use Scenario: Legal-for-trade platform scale with 100 kg capacity and 10 g readability using four 1 mV/V load cells. IC Role / Device Role / Timing Role: Single-channel ADC with gain = 128 amplifying 20 mV full-scale bridge output; performs system calibration against known weights. Use Value: Guaranteed 16-bit linearity and on-chip system calibration eliminate need for external precision DACs or trim pots in production calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714BRUZ | 16-bit, 5 V operation only; no 3 V variant; higher supply current (600 µA); identical pinout and register map. | Requires 5 V supply rail; unsuitable for battery-powered designs where AD7715ARU-3REEL7's 3 V/450 µA operation is critical. | Select AD7714BRUZ only if existing 5 V system infrastructure precludes voltage regulation for 3 V operation. |
| ADS124S08IPW | 24-bit, integrated PGA (1–128), 3.3 V operation; lower noise (150 nV RMS); SPI interface but no MCLK oscillator pins. | Higher resolution and lower noise suit demanding metrology; lacks crystal oscillator support - requires external clock source. | Choose ADS124S08IPW when 24-bit resolution and ultra-low noise outweigh need for self-contained clock generation. |
Compared with AD7714BRUZ and ADS124S08IPW, AD7715ARU-3REEL7 uniquely balances 16-bit precision, 3 V ultra-low-power operation, integrated crystal oscillator capability, and proven field reliability in industrial transmitters - making it optimal for cost-sensitive, space-constrained, and battery-aware sensor nodes requiring long-term stability.
Availability
AD7715ARU-3REEL7 is available at Aetrix Electronics and suitable for industrial pressure transmitters, RTD temperature monitors, and smart 4–20 mA loop-powered sensors requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7715ARU-3REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7715ARU-3REEL7 belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy industrial measurement systems where transducer interfacing, noise immunity, and calibration integrity are paramount.
FAQ
What is the operating voltage range for AD7715ARU-3REEL7?
The AD7715ARU-3REEL7 is rated for AVDD and DVDD operation between 3.0 V and 3.6 V. It is the -3 variant, meaning it is specified and characterized for 3 V supply operation - unlike the AD7715-5 which requires 4.75–5.25 V. Exceeding 3.6 V may cause permanent damage per Absolute Maximum Ratings.
Does AD7715ARU-3REEL7 support crystal oscillator configuration?
Yes, AD7715ARU-3REEL7 supports crystal oscillator mode: connect a parallel-resonant crystal or ceramic resonator between MCLK IN (Pin 2) and MCLK OUT (Pin 3). The device includes internal oscillator circuitry - no external capacitors are required. This eliminates the need for an external clock generator and simplifies layout in isolated or low-noise systems.
How does the AD7715ARU-3REEL7 handle 50/60 Hz interference rejection?
The AD7715ARU-3REEL7 achieves 98 dB rejection of 50 Hz and 60 Hz interference through its programmable digital filter notch. When configured for 25 Hz or 20 Hz notch frequencies respectively, the filter's first null aligns precisely with mains frequency harmonics - rejecting them without analog filtering components. This is guaranteed by design and verified across temperature.
Can AD7715ARU-3REEL7 interface directly with a 3.3 V microcontroller?
Yes, AD7715ARU-3REEL7 is fully compatible with 3.3 V logic systems. Its digital inputs accept VIH ≥ 2.0 V and VIL ≤ 0.4 V at DVDD = 3.3 V, and outputs drive VOH ≥ DVDD − 0.6 V and VOL ≤ 0.4 V under 100 µA load - matching standard 3.3 V CMOS levels without level-shifting circuitry.
What calibration modes are available on AD7715ARU-3REEL7?
AD7715ARU-3REEL7 provides both self-calibration (zero and full-scale) and system calibration (zero and full-scale) modes. Self-calibration corrects internal offset/gain errors; system calibration removes errors introduced by external front-end components like sensors and resistors. Both are initiated via software writes to the setup register and require no external voltage sources.
AD7715ARU-3REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7715ARU-3REEL7 FAQ
1.How can I place an order for AD7715ARU-3REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7715ARU-3REEL7 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 AD7715ARU-3REEL7 reliable?
The price and inventory of AD7715ARU-3REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7715ARU-3REEL7 is usually 5 days.
3.What payment methods are accepted for AD7715ARU-3REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7715ARU-3REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7715ARU-3REEL7?
AD7715ARU-3REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7715ARU-3REEL7 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 AD7715ARU-3REEL7?
For technical support, including AD7715ARU-3REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7715ARU-3REEL7 requirements.
6.How does Aetrix verify that AD7715ARU-3REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7715ARU-3REEL7 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 AD7715ARU-3REEL7 meets industry standards.
7.What is the process for return or replacement of AD7715ARU-3REEL7?
All AD7715ARU-3REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7715ARU-3REEL7, 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 AD7715ARU-3REEL7 part is unused and in its original packaging.
Return procedure for AD7715ARU-3REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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