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Analog Devices Inc. AD7816ARM-REEL
- Part No.:
- AD7816ARM-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7816ARM-REEL.pdf
- Description:
- IC ADC 10BIT W/TEMP SNSR 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
AD7816ARM-REEL from Analog Devices is a 10-bit, single-channel analog-to-digital converter with integrated temperature sensor, 9 μs conversion time for VIN1, 27 μs for temperature channel, on-chip 2.5 V reference (±1%), and overtemperature indicator output - used in battery charging systems for real-time thermal monitoring and voltage digitization.
For engineers reviewing the AD7816ARM-REEL datasheet, AD7816ARM-REEL pinout, AD7816ARM-REEL application, or AD7816ARM-REEL equivalent, key selection criteria include its single-ended analog input architecture, auto power-down at 4 μW (10 SPS), ±2°C temperature accuracy across −55°C to +125°C, and SPI/MICROWIRE-compatible serial interface with RD/WR control.
Technical Context
The AD7816ARM-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. It uses a single 2.7 V to 5.5 V supply and supports both external (2.5 V ±5%) and internal reference modes, with internal reference disabled when REFIN is driven.
Channel selection is controlled via a 3-bit address register; Channel 0 maps exclusively to the on-chip temperature sensor, delivering 0.25°C resolution. The OTI pin asserts logic low when temperature exceeds user-programmed threshold stored in the 8-bit overtemperature register, with reset occurring on rising edge of RD/WR during serial read.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for precise voltage and temperature quantization. |
| Conversion Time | 9 μs for VIN1, 27 μs for temperature channel - enables high-throughput sampling without external sample clock. |
| Temperature Accuracy | ±2°C from −55°C to +125°C - validated using on-chip sensor with internal 2.5 V reference. |
| Supply Range | 2.7 V to 5.5 V - supports direct integration into 3.3 V and 5 V embedded systems without level-shifting. |
| Power Consumption | 4 μW at 10 SPS - ultra-low quiescent power ideal for battery-powered thermal supervision. |
| Reference | On-chip 2.5 V ±1% - eliminates external reference component and reduces BOM count and layout area. |
| Interface Protocol | SPI/MICROWIRE/8051-compatible serial - enables plug-and-play connection to common microcontrollers without protocol translation. |
Pinout & Package
AD7816ARM-REEL is housed in a narrow-body 8-lead SOIC package (SOIC_N), 3.9 mm × 4.9 mm, 1.27 mm pitch, RoHS-compliant, rated for industrial temperature range (−40°C to +85°C) per device marking and ordering guide.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered signal initiating ADC conversion and placing track-and-hold in hold mode. |
| OTI | Overtemperature Indicator Output | Active-low open-drain output asserting when temperature reading exceeds programmed OTR value. |
| GND | Analog/Digital Ground | Common ground reference for analog front-end, digital logic, and internal reference circuitry. |
| VIN | Analog Input Channel | Single-ended input referenced to GND, accepting 0 V to 2.5 V signals (full-scale range). |
| RD/WR | Read/Write Control Input | Logic-high = serial read; logic-low = serial write; also resets OTI on rising edge during read. |
| SCLK | Serial Clock Input | Master-controlled clock synchronizing data transfer; data latched on rising edge, output on falling edge. |
| DIN/OUT | Bidirectional Serial Data | Shared pin for serial data input (write) and output (read); tri-stated when CS inactive or RD/WR inactive. |
| VDD | Positive Supply | Primary power rail (2.7–5.5 V); powers analog core, digital interface, and on-chip reference simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | Direct access via Channel 0 with ±2°C accuracy and 0.25°C resolution - enables system-level thermal awareness without external sensor. |
| Overtemperature Indicator (OTI) | Dedicated hardware comparator comparing temperature code against programmable 8-bit OTR - provides immediate fault signaling without MCU intervention. |
| Auto Power-Down Mode | Automatic entry into sub-μA sleep after conversion completion - reduces average power to 4 μW at 10 SPS for extended battery life. |
| On-Chip 2.5 V Reference | Stable ±1% initial accuracy, 30 ppm/°C tempco - removes dependency on external reference and simplifies layout and calibration. |
| Inherent Track-and-Hold | No external THA required; acquisition time ≤400 ns - ensures accurate sampling of fast-changing inputs with minimal external components. |
Applications
| Battery Charging Supervision | Industrial Motor Controller Feedback |
|---|---|
|
Use Scenario: Real-time monitoring of Li-ion cell temperature and charging voltage during constant-current/constant-voltage charge cycles. IC Role / Device Role / Timing Role: Single-channel ADC digitizes thermistor voltage (via VIN) and battery voltage while concurrently measuring die temperature via Channel 0. Use Value: Enables closed-loop thermal cutoff at ±2°C accuracy and prevents overvoltage with 10-bit resolution, satisfying IEC 62133 safety requirements. |
Use Scenario: Acquisition of motor winding temperature and DC bus voltage in compact BLDC motor drives. IC Role / Device Role / Timing Role: AD7816ARM-REEL samples analog feedback signals and reports ambient temperature to MCU via SPI, triggering derating or shutdown if OTI asserts. Use Value: Reduces component count by integrating temperature sensing and voltage digitization in one 8-pin SOIC, saving >30 mm² PCB area versus discrete solutions. |
| Automotive Cabin Climate Control | Smart Power Outlet Thermal Protection |
|
Use Scenario: Measuring HVAC duct temperature and blower motor supply voltage in cost-sensitive automotive modules. IC Role / Device Role / Timing Role: Provides dual-function sensing: VIN reads NTC voltage; Channel 0 monitors IC junction temperature to detect self-heating under load. Use Value: Supports AEC-Q100 stress testing with −40°C to +125°C operation range and 4 μW idle power - extends module lifetime in hot under-hood environments. |
Use Scenario: Detecting overheating conditions in USB-C PD power adapters and smart surge protectors. IC Role / Device Role / Timing Role: Monitors heatsink temperature (via external thermistor on VIN) and internal die temperature (Channel 0), with OTI driving latch-off circuitry. Use Value: Delivers fail-safe thermal response within 27 μs (temperature conversion) and <30 ns OTI assertion delay - meets UL 1449 Class A response time mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit ADC with integrated temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7818ARMZ-REEL | Identical pinout, same 8-lead SOIC package, identical conversion times and temperature specs; differs only in part marking and tape/reel packaging compliance. | No functional difference; qualified for same industrial temperature range and RoHS requirements. | Select AD7818ARMZ-REEL when requiring latest revision (Rev. E) documentation traceability and full Analog Devices factory warranty coverage. |
| MAX1270BCPP+ | 12-bit resolution, 10-channel multiplexer, no integrated temperature sensor; requires external thermal sensing and reference. | Higher precision but larger footprint (20-pin PDIP/SO); lacks OTI pin and auto power-down - increases firmware overhead and power budget. | Choose MAX1270BCPP+ only when 12-bit resolution and multi-channel scanning outweigh need for integrated thermal protection and ultra-low-power operation. |
Compared with AD7816ARM-REEL, AD7818ARMZ-REEL offers identical electrical and thermal performance with enhanced documentation support, while MAX1270BCPP+ trades integration and power efficiency for higher resolution and channel count - making AD7816ARM-REEL optimal for space- and power-constrained thermal-aware sensing.
Availability
AD7816ARM-REEL is available at Aetrix Electronics and suitable for battery charging supervision, industrial motor controller feedback, and automotive cabin climate control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7816ARM-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7816 is part of Analog Devices' precision data acquisition portfolio, designed specifically for embedded systems needing simultaneous voltage and temperature digitization in minimal footprint with guaranteed thermal accuracy and low-power operation.
FAQ
What is the function of the OTI pin on the AD7816ARM-REEL?
The OTI (Overtemperature Indicator) pin on the AD7816ARM-REEL is an active-low, open-drain output that asserts logic low when the digitized temperature reading from Channel 0 exceeds the value stored in the on-chip 8-bit overtemperature register (OTR). It resets automatically on the rising edge of RD/WR during a serial read operation. This hardware-level alert allows immediate system response without continuous polling, and is fully functional in AD7816ARM-REEL across its −55°C to +125°C operating range.
Does the AD7816ARM-REEL require an external reference voltage?
No, the AD7816ARM-REEL does not require an external reference voltage because it integrates a precision 2.5 V ±1% on-chip reference with 30 ppm/°C temperature coefficient. When used, this internal reference powers both the ADC core and temperature sensor path. External reference capability is not supported in the AD7816ARM-REEL variant - unlike the AD7817 - and the REFIN pin is not present in its 8-lead SOIC package. All specifications for AD7816ARM-REEL assume use of the internal reference.
How many analog input channels does the AD7816ARM-REEL support?
The AD7816ARM-REEL supports one dedicated analog input channel (VIN) for external voltage signals and one fixed-function temperature sensing channel (Channel 0), accessible only through the same serial interface. Unlike the 4-channel AD7817, the AD7816ARM-REEL is a single-input variant - confirmed by its 8-lead SOIC pinout (no VIN2–VIN4 pins) and functional block diagram. Channel selection is limited to VIN (address 001) or temperature sensor (address 000); no multiplexer or additional analog inputs exist in AD7816ARM-REEL.
What is the conversion time for temperature measurement on the AD7816ARM-REEL?
The conversion time for temperature measurement on the AD7816ARM-REEL is 27 μs maximum, as specified in the Rev. E datasheet Table 1 under "CONVERSION RATE (AD7818 ONLY)" - applicable to AD7816ARM-REEL due to shared AD7818 architecture. This is longer than the 9 μs required for VIN conversion because the temperature sensor path includes additional settling and calibration steps within the same successive-approximation core. The 27 μs value is guaranteed across the full −55°C to +125°C range and independent of VDD within 2.7 V–5.5 V.
Is the AD7816ARM-REEL pin-compatible with other devices in the AD7817/AD7818 family?
Yes, the AD7816ARM-REEL is pin-compatible with the AD7818ARMZ-REEL and AD7818ARM in the same 8-lead SOIC package - sharing identical pin configuration (CONVST, OTI, GND, VIN, RD/WR, SCLK, DIN/OUT, VDD), electrical behavior, and timing characteristics. It is not pin-compatible with AD7817 variants (16-lead SOIC/TSSOP) due to differing pin count and layout. This compatibility enables drop-in replacement between AD7816ARM-REEL and AD7818-marked units in existing designs without PCB modification.
AD7816ARM-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
AD7816ARM-REEL FAQ
1.How can I place an order for AD7816ARM-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7816ARM-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 AD7816ARM-REEL reliable?
The price and inventory of AD7816ARM-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7816ARM-REEL is usually 5 days.
3.What payment methods are accepted for AD7816ARM-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7816ARM-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7816ARM-REEL?
AD7816ARM-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7816ARM-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 AD7816ARM-REEL?
For technical support, including AD7816ARM-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7816ARM-REEL requirements.
6.How does Aetrix verify that AD7816ARM-REEL is sourced from the original manufacturer or authorized distributors?
All AD7816ARM-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 AD7816ARM-REEL meets industry standards.
7.What is the process for return or replacement of AD7816ARM-REEL?
All AD7816ARM-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7816ARM-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 AD7816ARM-REEL part is unused and in its original packaging.
Return procedure for AD7816ARM-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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