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Analog Devices Inc. AD7817BRU-REEL7
- Part No.:
- AD7817BRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7817BRU-REEL7.pdf
- Description:
- SENSOR DIGITAL -40C-85C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
AD7817BRU-REEL7 from Analog Devices is a 10-bit, 4-channel SAR ADC with integrated temperature sensor, 9 μs conversion time for analog channels, on-chip 2.5 V reference (±1%), and −55°C to +125°C operating range. It delivers ±1 LSB relative accuracy, 58 dB SNR at 100 kSPS, and automatic power-down-used in industrial process control for ambient temperature–aware data acquisition.
For engineers reviewing the AD7817BRU-REEL7 datasheet, AD7817BRU-REEL7 pinout, AD7817BRU-REEL7 application, or AD7817BRU-REEL7 equivalent, key selection considerations include its 4-channel single-ended input architecture, OTI overtemperature alert functionality, track-and-hold acquisition time of 400 ns, and compatibility with Intel 8051, SPI, QSPI, and MICROWIRE serial interfaces.
Technical Context
The AD7817BRU-REEL7 implements a capacitor-based successive approximation register (SAR) architecture with inherent track-and-hold, enabling precise sampling without external circuitry. Its internal 2.5 V reference (80 ppm/°C tempco) and dedicated temperature sensor channel (Channel 0) share the same 10-bit conversion core, delivering 0.25°C resolution and ±2°C error from −40°C to +85°C.
Serial communication uses a 3-wire interface (DIN, DOUT, SCLK) with RD/WR and CS control, supporting read/write operations via an 8-bit control byte that selects input channels or configures the overtemperature register. The OTI output asserts low when Channel 0's converted value exceeds the programmable threshold stored in the on-chip OTR register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes; supports 1024 discrete digital levels for precise analog signal digitization. |
| Conversion Time (VIN1–VIN4) | 9 μs - enables up to 100 kSPS throughput per channel without pipeline latency or settling delays. |
| Temperature Sensor Accuracy | ±2°C from −40°C to +85°C - provides factory-trimmed thermal monitoring without external calibration. |
| On-Chip Reference | 2.5 V ±1% - eliminates need for external reference IC; stable enough for <±1 LSB gain error across supply and temperature. |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic systems without level-shifting. |
| Power Consumption (1 kSPS) | 40 μW - achieves ultra-low energy per conversion, critical for battery-powered remote sensors. |
| Serial Interface Compatibility | Intel 8051 / SPI / QSPI / MICROWIRE - ensures plug-and-play integration with common microcontrollers and FPGAs. |
Pinout & Package
AD7817BRU-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for high-density PCB layouts and automated assembly. Pin functions are validated per Analog Devices Rev. E datasheet Figure 4 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered control signal initiating 10-bit 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 MCU synchronization. |
| OTI | Overtemperature Indicator | Active-low output asserting when Channel 0 (temp sensor) reading exceeds programmable OTR threshold. |
| CS | Chip Select Input | Enables serial port only when low; required for multi-device SPI bus sharing. |
| REFIN | Reference Input/Disable | Accepts external 2.5 V reference; tying to AGND enables internal 2.5 V reference and disables external path. |
| VIN1–VIN4 | Analog Input Channels | Four single-ended inputs referenced to AGND; each accepts 0 V to VREF (2.5 V) signals. |
| DOUT | Serial Data Output | Tri-state output clocked on SCLK falling edge; enters high-Z on RD/WR fall or CS rise. |
| DIN | Serial Data Input | Accepts 8-bit control bytes on SCLK rising edge for channel selection or OTR programming. |
| SCLK | Serial Clock Input | Master-controlled clock driving bidirectional serial data transfer; frequency up to 10 MHz supported. |
| RD/WR | Read/Write Direction Control | High = read (DOUT active), low = write (DIN sampled); defines data flow direction per transaction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | Direct access via Channel 0 with 0.25°C LSB resolution and ±2°C accuracy across industrial temperature range. |
| Programmable Overtemperature Alert | On-chip 8-bit overtemperature register (OTR) enables autonomous thermal shutdown signaling without host intervention. |
| Auto Power-Down Mode | Reduces current to 2 μA (at 3 V) after conversion completion-cuts average power by >99% at low throughput rates. |
| Inherent Track-and-Hold | Eliminates external sample-hold circuitry; 400 ns acquisition time ensures fidelity for fast-changing inputs. |
| Flexible Serial Interface | Single 3-wire bus (DIN/DOUT/SCLK) with RD/WR and CS supports multiple protocols-reduces GPIO count and PCB routing complexity. |
Applications
| Industrial Process Monitoring | Automotive Cabin Climate Control |
|---|---|
Use Scenario: Real-time monitoring of coolant, oil, and ambient temperatures in PLC-based manufacturing lines. IC Role / Device Role / Timing Role: ADC digitizes four analog sensor outputs (e.g., thermistors, RTDs) while concurrently measuring local die temperature for self-compensation. Use Value: Single-chip solution replaces discrete ADC + external temp sensor, reducing BOM cost and layout area by 35%. |
Use Scenario: Closed-loop HVAC control using cabin air, evaporator, and engine bay temperature feedback. IC Role / Device Role / Timing Role: Provides synchronized 10-bit readings from four NTC thermistors with sub-degree resolution and OTI-triggered fan speed override. Use Value: Enables deterministic 9 μs per channel sampling-critical for maintaining <±0.5°C thermal regulation stability. |
| Battery-Powered Environmental Logger | Smart Industrial Charger |
Use Scenario: Multi-sensor data logger deployed in remote field locations with 10-year battery life requirements. IC Role / Device Role / Timing Role: Measures ambient temperature and three auxiliary analog parameters (voltage, humidity, pressure) with auto power-down between samples. Use Value: 4 μW idle power at 10 SPS extends CR2032 battery life beyond 8 years without compromising measurement fidelity. |
Use Scenario: Li-ion battery charging station requiring cell voltage, current sense, and thermal foldback protection. IC Role / Device Role / Timing Role: Simultaneously monitors battery pack voltage (VIN1), shunt voltage (VIN2), thermistor (VIN3), and PCB temperature (Channel 0). Use Value: Integrated OTI provides immediate hardware-level thermal cutoff-bypassing software latency to prevent thermal runaway. |
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-REEL7 | Single-channel variant (1 VIN + temp sensor); identical 9 μs conversion time, ±2°C temp accuracy, and 2.5 V on-chip reference-but lacks VIN2–VIN4 inputs. | Used where only one analog signal plus temperature is required; saves board space but cannot replace 4-channel monitoring. | Select AD7818ARZ-REEL7 only if system requires exactly one analog input alongside temperature sensing. |
| MAX1242ACPA+ | 12-bit resolution, 8-channel, SPI-only interface; no integrated temperature sensor; requires external reference and external temp IC for thermal awareness. | Higher precision needed for metrology-grade measurements, but adds design complexity and component count for thermal functions. | Choose MAX1242ACPA+ when resolution >10 bits is mandatory and thermal sensing is implemented separately. |
Compared with AD7817BRU-REEL7, AD7818ARZ-REEL7 reduces channel count to simplify designs with minimal analog inputs, while MAX1242ACPA+ trades integrated thermal capability for higher resolution and channel density-requiring external components to match AD7817BRU-REEL7's self-contained temperature monitoring.
Availability
AD7817BRU-REEL7 is available at Aetrix Electronics and suitable for industrial process control, automotive cabin monitoring, and battery-powered environmental logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7817BRU-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7817/AD7818 product line was engineered specifically for embedded systems needing compact, low-power, multichannel data acquisition with autonomous thermal awareness-targeting industrial automation, automotive subsystems, and portable instrumentation.
FAQ
What is the maximum sampling rate achievable with AD7817BRU-REEL7?
The AD7817BRU-REEL7 achieves a maximum sampling rate of 100 kSPS per channel, enabled by its 9 μs conversion time for VIN1–VIN4. This allows full 4-channel sequencing at 25 kSPS aggregate rate. The device maintains 58 dB SNR and ±1 LSB relative accuracy at this throughput, making it suitable for dynamic signal capture in industrial control loops and motor feedback systems.
Does AD7817BRU-REEL7 require an external reference voltage?
No, AD7817BRU-REEL7 does not require an external reference voltage. It integrates a 2.5 V ±1% on-chip reference with 80 ppm/°C temperature coefficient. To enable it, tie the REFIN pin to AGND. An external 2.5 V reference can be applied to REFIN instead-but doing so disables the internal reference and increases system component count.
How is the temperature sensor accessed in AD7817BRU-REEL7?
The temperature sensor in AD7817BRU-REEL7 is accessed as Channel 0. When the address register is set to 000 (via 8-bit control byte), a conversion initiated by CONVST reads the on-die thermal diode output. The resulting 10-bit code corresponds to ambient temperature with 0.25°C/LSB resolution and ±2°C accuracy from −40°C to +85°C.
What is the function of the OTI pin on AD7817BRU-REEL7?
The OTI (Overtemperature Indicator) pin on AD7817BRU-REEL7 is an active-low open-drain output that asserts when the Channel 0 (temperature sensor) conversion result exceeds the value stored in the on-chip 8-bit overtemperature register (OTR). It resets automatically after a serial read operation, enabling hardware-triggered thermal shutdown without MCU polling overhead.
Can AD7817BRU-REEL7 operate from a 3.3 V supply?
Yes, AD7817BRU-REEL7 operates fully across 2.7 V to 5.5 V, including standard 3.3 V supplies. At VDD = 3.3 V, it draws 1.6 mA typical in normal operation and drops to 2 μA in power-down mode. Logic thresholds scale accordingly: VINH ≥ 2.0 V and VINL ≤ 0.4 V, ensuring reliable interfacing with 3.3 V microcontrollers without level shifters.
AD7817BRU-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:
- 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:
- 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
AD7817BRU-REEL7 FAQ
1.How can I place an order for AD7817BRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7817BRU-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 AD7817BRU-REEL7 reliable?
The price and inventory of AD7817BRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7817BRU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7817BRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7817BRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7817BRU-REEL7?
AD7817BRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7817BRU-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 AD7817BRU-REEL7?
For technical support, including AD7817BRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7817BRU-REEL7 requirements.
6.How does Aetrix verify that AD7817BRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7817BRU-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 AD7817BRU-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7817BRU-REEL7?
All AD7817BRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7817BRU-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 AD7817BRU-REEL7 part is unused and in its original packaging.
Return procedure for AD7817BRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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