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Analog Devices Inc. AD7715ARU-3REEL
- Part No.:
- AD7715ARU-3REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7715ARU-3REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
AD7715ARU-3REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter optimized for low-frequency precision measurement. It integrates a programmable-gain amplifier (gains 1/2/32/128), differential analog and reference inputs, on-chip digital filtering, and a three-wire SPI-compatible serial interface. Operating at 3 V with ≤450 µA total supply current, it directly digitizes microvolt-level transducer outputs in industrial sensor conditioning systems.
For engineers reviewing the AD7715ARU-3REEL datasheet, AD7715ARU-3REEL pinout, AD7715ARU-3REEL application, or AD7715ARU-3REEL equivalent, key selection criteria include its 16-bit no-missing-codes performance, ±0.0015% integral nonlinearity, 50 Hz/60 Hz notch filter programmability, unipolar/bipolar input range support, and TSSOP-16 package compatibility with isolated microcontroller interfaces.
Technical Context
The AD7715ARU-3REEL implements a charge-balancing sigma-delta modulator followed by a programmable digital filter whose first notch frequency determines output update rate and line-frequency rejection. Its analog front end includes a buffered or unbuffered differential input stage and separate differential reference inputs, enabling direct connection to strain gauges or RTDs without external signal conditioning.
It supports software-configurable gain, polarity, and calibration modes via an on-chip register bank accessed through a three-wire serial port. The device features self-calibration and system calibration sequences that eliminate zero-scale and full-scale errors, with drift specifications of 0.2 µV/°C for offset and full-scale under 3 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no missing codes - guarantees monotonicity and full dynamic range utilization in precision sensor digitization. |
| Integral Nonlinearity | ±0.0015% FSR - ensures high accuracy across full-scale range without correction tables in weight or pressure measurement. |
| Supply Current | ≤450 µA @ 3 V - enables battery-powered or energy-constrained applications such as portable instrumentation and smart field transmitters. |
| Input Ranges | Unipolar: 0 mV to 20 mV, 0 V to 2.5 V; Bipolar: ±20 mV, ±2.5 V - accommodates direct connection to low-level transducers and thermocouples. |
| Power Supply | AVDD = 3 V to 3.6 V; DVDD = 3 V to 5.25 V - supports single-supply 3 V systems while maintaining digital I/O compatibility with 3.3 V or 5 V controllers. |
| Filter Notch Programmability | Selectable 20 Hz, 25 Hz, 50 Hz, 60 Hz - provides configurable rejection of power-line interference in industrial environments. |
| Reference Input | REF IN(+) − REF IN(−) = 1.25 V nominal - matches internal 1.25 V bandgap reference for AD7715-3 variants, eliminating need for external precision reference. |
Pinout & Package
AD7715ARU-3REEL is housed in a 16-lead TSSOP package (RU suffix), 4.4 mm × 5.0 mm body, 0.65 mm pitch, with exposed pad for thermal enhancement. Pin 1 marked by dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock input | Synchronizes all serial data transfers; compatible with SPI/QSPI/MICROWIRE/DSP timing protocols. |
| 2 (MCLK IN) | Master clock input | Accepts 400 kHz–2.4576 MHz crystal oscillator or CMOS clock; determines conversion speed and filter cutoff. |
| 3 (MCLK OUT) | Master clock output | Drives crystal/resonator when used in oscillator mode; left floating if external clock applied to MCLK IN. |
| 4 (CS) | Chip select input | Active-low enables 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; sets full-scale range for analog input conversion. |
| 6 (AGND) | Analog ground | Separate ground return for analog circuitry; must be star-connected to minimize noise coupling into sensitive inputs. |
| 7 (DRDY) | Data ready output | Open-drain flag indicating valid conversion result available in data register; used for interrupt-driven reads. |
| 8 (RESET) | Hardware reset input | Active-low asynchronous reset clears registers and restarts calibration sequence; minimum pulse width 100 ns. |
| 9 (AVDD) | Analog supply | +3 V to +3.6 V analog power; powers PGA, modulator, and reference circuitry; requires local 10 µF + 0.1 µF decoupling. |
| 10 (AIN(+)) | Differential analog input (+) | High-impedance input (1 nA bias) accepting buffered or unbuffered signals up to AVDD + 30 mV. |
| 11 (AIN(–)) | Differential analog input (–) | Completes differential pair; common-mode voltage range extends from AGND to AVDD for flexible sensor interfacing. |
| 12 (REF IN(–)) | Negative reference input | Reference return node; tied to AGND in standard configuration; enables ratiometric measurements with bridge sensors. |
| 13 (DGND) | Digital ground | Separate ground for digital I/O; connected to AGND at single point near AVDD/DVDD decoupling capacitors. |
| 14 (DVDD) | Digital supply | +3 V to +5.25 V digital power; supplies serial interface and register logic; decoupled with 0.1 µF ceramic capacitor. |
| 15 (DIN) | Serial data input | Writes setup, test, and communications register values; MSB-first, 8-bit or 16-bit frames depending on RS1/RS0 address bits. |
| 16 (DOUT) | Serial data output | Reads data register, setup register, or status bits; tri-state controlled by CS; compatible with 3.3 V or 5 V logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gain amplifier | Gains of 1, 2, 32, and 128 eliminate external amplification stages for millivolt-output sensors like load cells and thermopiles. |
| Differential analog and reference inputs | Rejects common-mode noise up to 150 dB at 50/60 Hz, enabling stable measurements in electrically noisy factory environments. |
| On-chip self- and system-calibration | Removes gain and offset errors without external calibration equipment; recalibration at temperature eliminates drift-induced inaccuracies. |
| Low-power standby mode | Reduces current to 10 µA typical at 3.3 V, supporting wake-on-event architectures in battery-operated remote monitoring nodes. |
| Three-wire serial interface | Minimizes PCB routing and optocoupler count in isolated systems, reducing BOM cost and board area in PLC analog input modules. |
Applications
| Pressure Measurement | Temperature Measurement |
|---|---|
Use Scenario: Digitizing output of silicon piezoresistive pressure sensors in HVAC differential pressure transmitters. IC Role / Device Role / Timing Role: ADC front end performing gain scaling, filtering, and serial digitization of mV-level bridge outputs. Use Value: 16-bit resolution and 50 Hz notch filtering enable <1 Pa resolution with immunity to AC mains interference in building automation systems. | Use Scenario: Converting thermocouple or RTD signals in industrial process temperature controllers. IC Role / Device Role / Timing Role: Precision analog front end handling cold-junction compensation, linearization, and digital output formatting. Use Value: ±0.0015% INL and 0.2 µV/°C offset drift ensure <0.1°C repeatability over –40°C to +85°C ambient range. |
| Smart Transmitters | Strain Gauge Instrumentation |
Use Scenario: Embedding in 4–20 mA HART-enabled field instruments for remote diagnostics and configuration. IC Role / Device Role / Timing Role: Core ADC providing calibrated digital data to microcontroller for HART modulation and loop communication. Use Value: Three-wire interface and low 450 µA supply current allow full functionality within 4 mA loop budget during digital communication bursts. | Use Scenario: High-accuracy weigh scale electronics using full-bridge strain gauge arrays. IC Role / Device Role / Timing Role: Signal conditioner and ADC converting microvolt differential outputs into calibrated weight values. Use Value: Programmable gain (up to 128×) and bipolar input ranges support both tare and overload detection without external op-amps or level-shifting. |
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 |
|---|---|---|---|
| AD7714ARU-3 | 5-channel multiplexed input vs. single channel; identical 16-bit sigma-delta core, 3 V operation, and TSSOP-16 package. | Supports multi-sensor systems (e.g., multi-point temperature monitoring); requires additional channel sequencing firmware. | Choose AD7714ARU-3 when measuring >1 analog signal with shared ADC resources and space-constrained layout. |
| ADS124S08IPW | Texas Instruments part: 24-bit resolution, integrated PGA (1–128), but higher 1.8 mA supply current and QFN-20 package. | Better resolution for ultra-high-precision lab equipment; less suitable for low-power or legacy TSSOP footprints. | Choose ADS124S08IPW only when 24-bit resolution is mandatory and power/size constraints permit. |
Compared with AD7714ARU-3, AD7715ARU-3REEL offers lower system complexity for single-sensor applications and reduced firmware overhead; compared with ADS124S08IPW, it delivers proven 16-bit stability at one-quarter the supply current and in a drop-in compatible TSSOP-16 footprint.
Availability
AD7715ARU-3REEL is available at Aetrix Electronics and suitable for industrial process control, smart field transmitter design, and precision sensor module development requiring stable component supply and long-term manufacturability.
Supply support for AD7715ARU-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7715 belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy industrial measurement applications where noise rejection, calibration integrity, and low power are critical.
FAQ
What is the maximum master clock frequency supported by AD7715ARU-3REEL?
The AD7715ARU-3REEL is production-tested at 2.4576 MHz and guaranteed by characterization to operate up to 2.5 MHz. Minimum clock frequency is 400 kHz. Operation outside this range may cause incorrect conversion timing or increased noise; the device requires continuous clocking during active mode to maintain calibration integrity.
Does AD7715ARU-3REEL require an external reference voltage?
No - AD7715ARU-3REEL includes an internal 1.25 V bandgap reference optimized for 3 V operation. REF IN(+) and REF IN(–) can be connected directly to this internal reference (via on-chip switch) or to an external source. Using the internal reference eliminates external component count and improves system-level temperature stability.
Can AD7715ARU-3REEL interface directly with a 5 V microcontroller?
Yes - AD7715ARU-3REEL's digital I/O (SCLK, CS, DIN, DOUT, DRDY) are specified for DVDD = 3 V to 5.25 V operation. With DVDD = 5 V, logic high input threshold is 2.4 V and output high is ≥4.0 V, ensuring robust interoperability with standard 5 V CMOS microcontrollers without level-shifting.
How does the buffer mode affect AD7715ARU-3REEL's input performance?
When the BUF bit in the Setup Register is set to 1, the analog input buffer is enabled, increasing input impedance (>1 GΩ) and allowing direct connection to high-impedance sources like thermocouples. However, buffered mode increases AVDD current by ~0.3 mA and reduces usable input common-mode range to AGND + 0.05 V to AVDD − 1.5 V.
Is AD7715ARU-3REEL RoHS compliant and lead-free?
Yes - AD7715ARU-3REEL is manufactured in a RoHS-compliant, lead-free process and packaged in a Pb-free TSSOP-16 (RU) package. The "REEL" suffix indicates tape-and-reel packaging per JEDEC J-STD-020 moisture sensitivity level 3, with floor life of 168 hours at ≤30°C/60% RH.
AD7715ARU-3REEL 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-3REEL FAQ
1.How can I place an order for AD7715ARU-3REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7715ARU-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 AD7715ARU-3REEL reliable?
The price and inventory of AD7715ARU-3REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7715ARU-3REEL is usually 5 days.
3.What payment methods are accepted for AD7715ARU-3REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7715ARU-3REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7715ARU-3REEL?
AD7715ARU-3REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7715ARU-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 AD7715ARU-3REEL?
For technical support, including AD7715ARU-3REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7715ARU-3REEL requirements.
6.How does Aetrix verify that AD7715ARU-3REEL is sourced from the original manufacturer or authorized distributors?
All AD7715ARU-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 AD7715ARU-3REEL meets industry standards.
7.What is the process for return or replacement of AD7715ARU-3REEL?
All AD7715ARU-3REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7715ARU-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 AD7715ARU-3REEL part is unused and in its original packaging.
Return procedure for AD7715ARU-3REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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