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Analog Devices Inc. AD7816AR-REEL
- Part No.:
- AD7816AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7816AR-REEL.pdf
- Description:
- IC ADC 10BIT W/TEMP SNSR 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:47,500
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Product details
Overview
AD7816AR-REEL from Analog Devices is a 10-bit, single-channel analog-to-digital converter with integrated temperature sensor, 9 μs conversion time for voltage inputs and 27 μs for temperature sensing, on-chip 2.5 V reference (±1%), and −55°C to +125°C operating range. It serves as a compact ambient temperature and voltage monitoring solution in battery-powered industrial sensors and embedded control systems.
For engineers reviewing the AD7816AR-REEL datasheet, AD7816AR-REEL pinout, AD7816AR-REEL application, or AD7816AR-REEL equivalent, key selection criteria include its single-ended input architecture, auto power-down at 4 μW (10 SPS), overtemperature indicator (OTI) output, and compatibility with SPI/MICROWIRE/8051 serial interfaces - all critical for low-power thermal-aware data acquisition.
Technical Context
The AD7816AR-REEL implements a successive approximation ADC core with capacitor DAC architecture, inherent track-and-hold functionality, and an internal clock oscillator - eliminating need for external timing components. Its temperature sensor is accessed via Channel 0 and delivers 0.25°C resolution with ±2°C accuracy from −40°C to +85°C using the on-chip reference.
Conversion is initiated by a falling edge on CONVST; BUSY goes high during conversion and OTI asserts low when temperature exceeds the programmable overtemperature register threshold. Serial communication uses a flexible 3-wire interface (SCLK, DIN/OUT, RD/WR) supporting read/write operations with address register selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - provides 1024 discrete digital codes for precise voltage and temperature quantization. |
| Conversion Time | 9 μs (voltage channel), 27 μs (temperature sensor) - enables rapid sampling without external sample clock management. |
| Temperature Accuracy | ±2°C from −40°C to +85°C - ensures reliable thermal monitoring in industrial and automotive environments. |
| Supply Range | 2.7 V to 5.5 V - supports direct integration with Li-ion battery rails and standard 3.3 V/5 V logic domains. |
| Power Consumption | 4 μW at 10 SPS - achieves ultra-low standby power ideal for energy-constrained remote sensors. |
| Reference | On-chip 2.5 V ±1% - eliminates external reference component and associated layout complexity. |
| Interface Protocol | SPI/MICROWIRE/8051-compatible 3-wire serial - simplifies host MCU firmware integration across multiple platforms. |
Pinout & Package
AD7816AR-REEL is housed in an 8-lead SOIC package (width 3.9 mm, body height 1.75 mm), pin-compatible with AD7818 and optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered signal initiating conversion; also controls automatic power-down when held low post-conversion. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion - used for interrupt-driven MCU synchronization. |
| OTI | Overtemperature Indicator Output | Active-low signal asserting when Channel 0 (temperature sensor) reading exceeds OTR register value - enables hardware thermal shutdown. |
| GND | Analog/Digital Ground | Common reference for both analog and digital sections - requires single-point grounding to minimize noise coupling. |
| VIN | Analog Input Channel | Single-ended input referenced to GND, accepting 0 V to 2.5 V signals - no external buffer needed for low-impedance sources. |
| VDD | Positive Supply | 2.7 V–5.5 V supply powering entire device - decoupling capacitor required within 1 cm of pin for stable operation. |
| DIN/OUT | Serial Data I/O | Tri-state bidirectional pin for SPI-like data transfer - reduces pin count vs. separate DOUT/DIN implementations. |
| SCLK | Serial Clock Input | Master-generated clock synchronizing all serial transfers - data latched on rising edge, output valid on falling edge. |
| RD/WR | Read/Write Control | Logic-high = read mode (data out), logic-low = write mode (control byte in) - defines direction of DIN/OUT traffic. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | Direct-access Channel 0 with ±2°C accuracy and 0.25°C resolution - eliminates need for external thermistor or RTD signal chain. |
| Overtemperature Indicator (OTI) | Dedicated hardware comparator output tied to programmable register - enables immediate system-level thermal response without MCU polling. |
| Auto Power-Down Mode | Enters sub-μA state automatically after conversion completion - reduces average power to 4 μW at 10 SPS for battery longevity. |
| On-Chip 2.5 V Reference | ±1% initial accuracy, 30 ppm/°C tempco - ensures stable conversion baseline across voltage and temperature without external reference IC. |
| Inherent Track-and-Hold | No external circuitry required - acquires and holds analog input during conversion, supporting up to 100 kSPS sampling rate. |
Applications
| Industrial Process Monitoring | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Real-time monitoring of motor winding temperature and supply rail voltage in PLC I/O modules. IC Role / Device Role / Timing Role: Single-chip dual-function sensor providing synchronized voltage and thermal readings via shared serial bus. Use Value: Reduces BOM count by replacing discrete ADC + temperature IC pair while maintaining ±2°C thermal accuracy and 9 μs voltage sampling. |
Use Scenario: Cabin air temperature and HVAC actuator feedback in entry-level automotive ECUs. IC Role / Device Role / Timing Role: Primary ambient temperature monitor with hardware OTI output triggering fan speed control logic. Use Value: Enables fail-safe thermal response using OTI pin directly driving comparator input - no software latency in overtemperature events. |
| Portable Battery Management | Smart Building Thermostats |
|
Use Scenario: Simultaneous cell voltage and battery pack temperature tracking in rechargeable tool packs. IC Role / Device Role / Timing Role: Low-power ADC interfacing to microcontroller via 3-wire SPI, entering auto power-down between samples. Use Value: Achieves 4 μW average power at 10 SPS - extends battery life in wireless sensor nodes without sacrificing thermal resolution. |
Use Scenario: Wall-mounted thermostat measuring ambient temperature and auxiliary supply voltage for self-diagnostics. IC Role / Device Role / Timing Role: Dual-role sensor delivering calibrated temperature data and supply health status over same serial interface. Use Value: Eliminates separate voltage monitor IC; on-chip 2.5 V reference ensures consistent ADC performance across 2.7–5.5 V input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit temperature-sensing ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7818ARZ-REEL7 | Identical pinout, identical specs, same SOIC-8 package - differs only in tape-and-reel packaging and RoHS compliance marking. | No functional difference; suitable for drop-in replacement where lead-free compliance is required. | Select AD7818ARZ-REEL7 when RoHS-compliant manufacturing and full traceability per JEDEC J-STD-020 are mandatory. |
| MAX1270BCPP+ | 12-bit resolution, 10 μs conversion, external reference required, no integrated temperature sensor - higher precision but added BOM cost and layout area. | Used where voltage measurement accuracy >10-bit is prioritized over thermal sensing integration. | Choose MAX1270BCPP+ only if system requires ≥12-bit voltage resolution and can accommodate external reference and discrete temperature sensing. |
Compared with AD7816AR-REEL, AD7818ARZ-REEL7 offers identical electrical and thermal performance with certified lead-free finish, while MAX1270BCPP+ trades integrated temperature sensing for higher voltage resolution and external reference flexibility - making AD7816AR-REEL optimal for cost- and space-sensitive thermal-aware data acquisition.
Availability
AD7816AR-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, automotive cabin sensing, and portable battery management requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for AD7816AR-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 centers worldwide and ISO 9001-certified manufacturing.
The AD7816AR-REEL belongs to Analog Devices' precision data acquisition portfolio, engineered specifically for embedded systems needing integrated temperature sensing and low-power voltage digitization in harsh environments.
FAQ
What is the primary function of the AD7816AR-REEL?
The AD7816AR-REEL is a 10-bit analog-to-digital converter with an integrated temperature sensor, designed to digitize single-ended analog voltages (0 V to 2.5 V) and measure ambient temperature via Channel 0. Its on-chip 2.5 V reference, 9 μs voltage conversion time, and OTI output make AD7816AR-REEL ideal for compact, low-power thermal-aware monitoring in industrial and automotive applications.
Does the AD7816AR-REEL require an external reference voltage?
No, the AD7816AR-REEL includes an on-chip 2.5 V reference with ±1% initial accuracy and 30 ppm/°C temperature coefficient, eliminating the need for external reference components. The device operates fully autonomously with only VDD, GND, and serial interface connections - simplifying design and reducing bill-of-materials cost for AD7816AR-REEL implementations.
How does the overtemperature indicator (OTI) work on the AD7816AR-REEL?
The OTI pin on the AD7816AR-REEL asserts logic low when the digitized temperature reading from Channel 0 exceeds the value stored in the internal 8-bit overtemperature register (OTR). This hardware-level comparison occurs independently of the host MCU, enabling immediate thermal fault response. The OTI signal resets after a serial read operation completes - ensuring AD7816AR-REEL supports deterministic overtemperature handling.
What serial interface protocols does the AD7816AR-REEL support?
The AD7816AR-REEL supports SPI, MICROWIRE, and Intel 8051-compatible 3-wire serial interfaces using SCLK, RD/WR, and bidirectional DIN/OUT pins. It requires no mode configuration - automatically adapts to host timing and protocol conventions. This flexibility allows seamless integration with diverse microcontrollers without custom driver development for AD7816AR-REEL communication.
What is the power consumption profile of the AD7816AR-REEL at different throughput rates?
The AD7816AR-REEL consumes 4 μW at 10 SPS, 48.8 μW at 1 kSPS, and 434 μW at 10 kSPS under VDD = 3 V - enabled by automatic power-down after each conversion. In full shutdown (power-down mode), current drops to 4.5 μA at 3 V. This scalable power profile makes AD7816AR-REEL suitable for both burst-mode sensing and continuous monitoring applications.
AD7816AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 85°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 10 b
- Features:
- -
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 25°C (-40°C ~ 85°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
AD7816AR-REEL FAQ
1.How can I place an order for AD7816AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7816AR-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 AD7816AR-REEL reliable?
The price and inventory of AD7816AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7816AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7816AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7816AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7816AR-REEL?
AD7816AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7816AR-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 AD7816AR-REEL?
For technical support, including AD7816AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7816AR-REEL requirements.
6.How does Aetrix verify that AD7816AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7816AR-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 AD7816AR-REEL meets industry standards.
7.What is the process for return or replacement of AD7816AR-REEL?
All AD7816AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7816AR-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 AD7816AR-REEL part is unused and in its original packaging.
Return procedure for AD7816AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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