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Analog Devices Inc. AD7817BRUZ-REEL7
- Part No.:
- AD7817BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7817BRUZ-REEL7.pdf
- Description:
- SENSOR DIGITAL -40C-85C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
AD7817BRUZ-REEL7 from Analog Devices is a 10-bit, 4-channel successive approximation ADC with integrated temperature sensor, 9 μs conversion time for analog inputs, ±2°C temperature accuracy from −40°C to +85°C, and on-chip 2.5 V reference. It operates from 2.7 V to 5.5 V and serves as a compact sensing front-end in battery-powered industrial monitoring systems.
For engineers reviewing the AD7817BRUZ-REEL7 datasheet, AD7817BRUZ-REEL7 pinout, AD7817BRUZ-REEL7 application, or AD7817BRUZ-REEL7 equivalent, key selection considerations include its 4-channel single-ended architecture, overtemperature indicator (OTI) output, auto power-down at 4 μW (10 SPS), and compatibility with SPI/QSPI/MICROWIRE serial interfaces.
Technical Context
The AD7817BRUZ-REEL7 implements a capacitor-based SAR architecture with inherent track-and-hold functionality and an internal clock oscillator. Its conversion sequence begins on the falling edge of CONVST, with BUSY asserted high during conversion and OTI asserting low when Channel 0 (temperature sensor) exceeds the programmable overtemperature register threshold.
It supports flexible serial communication via DIN/DOUT/SCLK/RD/WR/CS signals, enabling direct interfacing with microcontrollers without external timing components. The device selects input channels via a 3-bit address register and uses REFIN tied to AGND to enable the internal 2.5 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for precise analog signal digitization |
| Conversion Time | 9 μs for VIN1–VIN4 - enables up to ~111 kSPS sampling rate per channel |
| Temperature Accuracy | ±2°C from −40°C to +85°C - calibrated measurement using on-chip sensor accessed via Channel 0 |
| Supply Range | 2.7 V to 5.5 V - supports direct integration into 3.3 V and 5 V systems without level-shifting |
| Power Consumption | 4 μW at 10 SPS - ultra-low quiescent power ideal for intermittent sensing in energy-constrained devices |
| Reference | On-chip 2.5 V ±1% - eliminates need for external reference component; shuts down when REFIN is externally driven |
| Interface Protocol | SPI/QSPI/MICROWIRE-compatible - interoperable with common MCU peripherals without protocol translation |
Pinout & Package
AD7817BRUZ-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance (θJA = 206°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered control signal initiating conversion and placing track-and-hold into hold mode |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating ongoing conversion; used for interrupt-driven firmware polling |
| OTI | Overtemperature Indicator | Active-low output asserting when Channel 0 reading exceeds OTR register value; resets after serial read completion |
| CS | Chip Select Input | Enables serial interface only when low; required for multi-device SPI bus sharing |
| REFIN | Reference Input/Disable | Accepts external 2.5 V reference; tying to AGND activates internal reference and disables external path |
| VIN1–VIN4 | Analog Input Channels | Four single-ended inputs referenced to AGND; each converts 0 V to VREF range with ±1 LSB DNL |
| DOUT | Serial Data Output | Tri-state output releasing bus on falling RD/WR or rising CS - prevents contention in shared bus systems |
| DIN | Serial Data Input | Accepts 8-bit control bytes for address register (channel select) or overtemperature register (OTR) writes |
| SCLK | Serial Clock Input | Drives synchronous data transfer; data latched on rising edge (DIN), sampled on falling edge (DOUT) |
| RD/WR | Read/Write Direction Control | High = read (DOUT active), low = write (DIN sampled); defines transaction direction for full-duplex SPI-like operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | Provides calibrated ambient temperature readings via Channel 0 with 0.25°C resolution and ±2°C error across −40°C to +85°C |
| Overtemperature Indicator (OTI) | Dedicated hardware comparator triggers immediate logic-low alert when temperature exceeds user-programmable threshold stored in OTR register |
| Auto Power-Down Mode | Automatically enters low-power state after conversion completes if CONVST remains low - reduces average power to 4 μW at 10 SPS |
| Inherent Track-and-Hold | Eliminates need for external sample-hold circuitry; acquisition time of 400 ns ensures accurate sampling even after channel switching |
| Flexible Serial Interface | Supports Intel 8051, Motorola SPI/QSPI, and National MICROWIRE protocols - simplifies firmware integration across diverse MCU platforms |
Applications
| Industrial Process Monitoring | Battery Management Systems |
|---|---|
Use Scenario: Continuous monitoring of motor winding temperature and supply rail voltages in PLC I/O modules. IC Role / Device Role / Timing Role: ADC front-end acquiring four analog inputs (current sense, voltage rails, thermistor, ambient temp) with synchronized 9 μs conversions. Use Value: Single-chip solution replaces discrete ADC + temp sensor + reference, reducing BOM count and layout area by >30%. | Use Scenario: Real-time cell voltage and pack temperature tracking in portable medical device chargers. IC Role / Device Role / Timing Role: Low-power sensing node performing periodic 10 SPS conversions on battery voltage and integrated temperature sensor. Use Value: 4 μW standby power extends battery life between charges; OTI provides hardware-level thermal fault detection independent of host MCU. |
| Automotive Cabin Sensors | Data Acquisition Modules |
Use Scenario: Cabin air quality unit measuring HVAC coil temperature, ambient humidity (via resistive sensor), and supply stability. IC Role / Device Role / Timing Role: 4-channel ADC digitizing thermistor, NTC, VREF monitor, and temperature sensor outputs with ±2°C accuracy. Use Value: On-chip 2.5 V reference ensures consistent scaling across all channels; wide −55°C to +125°C operating range meets AEC-Q200 stress requirements. | Use Scenario: Modular test equipment capturing environmental parameters (vibration, temp, pressure) in field-deployed condition monitoring nodes. IC Role / Device Role / Timing Role: Primary analog capture IC multiplexing four sensor signals onto a single SPI bus with BUSY-interrupt synchronization. Use Value: 9 μs conversion time enables sub-100 μs total cycle time for all four channels, supporting 10 kHz effective aggregate sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel ADC with temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7818ARZ | Single-channel variant with identical 10-bit SAR core, 9 μs conversion, and on-chip temperature sensor; 8-lead SOIC package | Lacks VIN2–VIN4 inputs; suitable only where single analog input + temperature is sufficient | Select AD7818ARZ when board space is critical and 4-channel capability is unnecessary - saves ~30% PCB area |
| MCP3204-I/P | 12-bit, 4-channel SPI ADC without integrated temperature sensor; requires external temp IC and reference; 100 kSPS max | No hardware OTI output; temperature measurement requires software coordination and additional components | Choose MCP3204-I/P only if higher resolution (12-bit) outweighs added design complexity and component count |
Compared with AD7817BRUZ-REEL7, AD7818ARZ reduces channel count and footprint but retains identical temperature sensing and power features, while MCP3204-I/P trades integration for resolution and requires external support circuitry - making AD7817BRUZ-REEL7 optimal for compact, self-contained thermal-aware data acquisition.
Availability
AD7817BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial process control, battery management systems, and automotive cabin sensor applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AD7817BRUZ-REEL7 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 and manufacturing facilities worldwide.
The AD7817 product line delivers integrated data acquisition solutions targeting space- and power-constrained embedded systems needing simultaneous analog voltage and ambient temperature measurement without external support components.
FAQ
What is the maximum operating temperature range for the AD7817BRUZ-REEL7?
The AD7817BRUZ-REEL7 operates from −55°C to +125°C. Its temperature sensor is specified for ±2°C accuracy from −40°C to +85°C, and the full device functionality-including 10-bit ADC conversion and serial interface-is guaranteed across the extended industrial range. This makes AD7817BRUZ-REEL7 suitable for under-hood automotive and industrial environments where thermal extremes are expected.
How does the overtemperature indicator (OTI) function in the AD7817BRUZ-REEL7?
The OTI pin in AD7817BRUZ-REEL7 asserts logic low when the digitized output of Channel 0 (temperature sensor) exceeds the 8-bit value stored in the on-chip overtemperature register (OTR). The comparison occurs automatically after each Channel 0 conversion. OTI resets to high on the rising edge of RD/WR during a serial read, enabling hardware-level thermal fault detection without MCU intervention - a key safety feature in AD7817BRUZ-REEL7 designs.
Can the AD7817BRUZ-REEL7 use both internal and external references simultaneously?
No. The AD7817BRUZ-REEL7 supports either the internal 2.5 V reference or an external reference, not both. When REFIN is left unconnected or tied to AGND, the internal reference activates. If an external 2.5 V reference is applied to REFIN, the internal reference shuts down automatically. This design prevents conflict and ensures stable reference selection - a behavior explicitly defined in the AD7817BRUZ-REEL7 datasheet's "ON-CHIP REFERENCE" section.
What is the significance of the BUSY signal in AD7817BRUZ-REEL7 timing operations?
The BUSY signal in AD7817BRUZ-REEL7 is a logic-high pulse asserted during conversion - lasting 9 μs for VIN1–VIN4 or 27 μs for the temperature sensor - and serves as a hardware synchronization flag. It allows microcontrollers to avoid polling or fixed delays by triggering interrupts or waiting for BUSY deassertion before initiating subsequent reads. This deterministic timing behavior is critical for real-time AD7817BRUZ-REEL7 system responsiveness and deterministic firmware execution.
Does the AD7817BRUZ-REEL7 require external passive components for basic operation?
No. The AD7817BRUZ-REEL7 requires no external passive components for core operation: it integrates a track-and-hold amplifier, 2.5 V reference, clock oscillator, and temperature sensor. Only decoupling capacitors (recommended 100 nF ceramic near VDD and AGND/DGND) and optional series resistors for ESD protection are advised. This level of integration distinguishes AD7817BRUZ-REEL7 from discrete ADC+sensor solutions and reduces bill-of-materials overhead significantly.
AD7817BRUZ-REEL7 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:
- Active
- 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:
- Output Switch
- Accuracy - Highest (Lowest):
- ±2.25°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:
- 16-TSSOP
AD7817BRUZ-REEL7 FAQ
1.How can I place an order for AD7817BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7817BRUZ-REEL7 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 AD7817BRUZ-REEL7 reliable?
The price and inventory of AD7817BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7817BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7817BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7817BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7817BRUZ-REEL7?
AD7817BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7817BRUZ-REEL7 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 AD7817BRUZ-REEL7?
For technical support, including AD7817BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7817BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7817BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7817BRUZ-REEL7 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 AD7817BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7817BRUZ-REEL7?
All AD7817BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7817BRUZ-REEL7, 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 AD7817BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7817BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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