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Analog Devices Inc. AD7817BR-REEL7
- Part No.:
- AD7817BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7817BR-REEL7.pdf
- Description:
- IC ADC 10BIT W/TEMP SNSR 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
AD7817BR-REEL7 from Analog Devices is a 10-bit, 4-channel successive-approximation ADC with integrated temperature sensor, 9 μs conversion time for analog channels, on-chip 2.5 V ±1% reference, and −40°C to +85°C measurement accuracy of ±2°C. It serves as a compact data acquisition front-end in embedded monitoring systems requiring simultaneous voltage and ambient temperature sensing.
For engineers reviewing the AD7817BR-REEL7 datasheet, AD7817BR-REEL7 pinout, AD7817BR-REEL7 application, or AD7817BR-REEL7 equivalent, key selection criteria include its 4 single-ended analog inputs, channel-selectable serial interface (SPI/MICROWIRE/8051-compatible), overtemperature indicator (OTI) output, auto power-down mode (4 μW at 10 SPS), and SOIC-16 narrow-body package compatibility.
Technical Context
The AD7817BR-REEL7 implements a capacitor-based successive-approximation architecture with inherent track-and-hold functionality and an internal clock oscillator. Its conversion core operates independently of external timing, enabling deterministic 9 μs conversions on VIN1–VIN4 and 27 μs on the temperature sensor channel (Channel 0).
It integrates dual ground domains (AGND/DGND), supports both external (2.375 V–2.625 V) and internal reference modes, and uses a flexible 3-wire serial interface with separate DIN/DOUT lines and RD/WR-controlled read/write direction. The OTI pin provides asynchronous overtemperature alerting via comparison against an 8-bit programmable register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for precise quantization of analog signals. |
| Conversion Time (VIN1–VIN4) | 9 μs - enables up to ~111 kSPS sustained sampling without pipeline latency. |
| Temperature Sensor Accuracy | ±2°C from −40°C to +85°C - supports reliable ambient thermal monitoring without calibration. |
| Supply Voltage Range | 2.7 V to 5.5 V - allows direct interfacing with 3.3 V and 5 V logic systems without level-shifting. |
| Power Consumption (10 SPS) | 4 μW - enables ultra-low-power operation in battery-backed or energy-constrained applications. |
| Reference | On-chip 2.5 V ±1% - eliminates need for external reference component while maintaining ±2°C temp accuracy. |
| Operating Temperature Range | −55°C to +125°C - ensures functional reliability across industrial and automotive under-hood environments. |
Pinout & Package
AD7817BR-REEL7 is housed in a 16-lead narrow-body SOIC (0.15 inch width), RoHS-compliant, tape-and-reel packaging format (REEL7 denotes 1,000-unit reel). Pin layout follows standard SOIC pinout with dual ground separation and dedicated analog/digital I/O routing.
| 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 A/D conversion; used for interrupt-driven polling. |
| OTI | Overtemperature Indicator | Active-low output asserting when Channel 0 (temp sensor) reading exceeds programmable OTR threshold. |
| CS | Chip Select Input | Enables serial interface only when low; required for multi-device SPI bus sharing. |
| AGND | Analog Ground Reference | Return path for analog circuitry (track-and-hold, DAC, REFIN); must be isolated from DGND at single point. |
| REFIN | Reference Input/Disable | Accepts 2.5 V external 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 supports 0 V to VREF range (2.5 V nominal). |
| VDD | Positive Supply | 2.7 V–5.5 V main supply powering analog and digital sections; decoupling near pin is mandatory. |
| DGND | Digital Ground Reference | Return path for digital I/O (SCLK, DIN, DOUT, RD/WR); connects to system digital ground plane. |
| DOUT | Serial Data Output | High-impedance tri-state output delivering conversion results MSB-first on falling SCLK edge. |
| DIN | Serial Data Input | Accepts 8-bit control bytes (address or OTR writes) on rising SCLK edge; requires setup/hold timing compliance. |
| SCLK | Serial Clock Input | Master-synchronized clock driving all serial transfers; frequency limited by t8/t9 min pulse widths (40 ns). |
| RD/WR | Read/Write Direction Control | High = read DOUT; low = write DIN; determines data flow direction during CS-active window. |
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 over −40°C to +85°C. |
| Overtemperature indicator (OTI) | Hardware-level alert output that asserts low when temperature exceeds user-programmable threshold, eliminating MCU polling overhead. |
| Auto power-down mode | Reduces IDD to 2 μA typical at 3 V after conversion completion, enabling <4 μW average power at 10 SPS throughput. |
| Flexible serial interface | Supports Intel 8051, Motorola SPI/QSPI, and National MICROWIRE protocols via configurable RD/WR and CS timing. |
| Inherent track-and-hold | Eliminates need for external sample-hold circuitry; acquisition time of 400 ns ensures stability before next conversion trigger. |
Applications
| Industrial Process Monitoring | Automotive Cabin Climate Control |
|---|---|
|
Use Scenario: Real-time monitoring of multiple sensor voltages (pressure, humidity, flow) alongside ambient temperature in PLC I/O modules. IC Role / Device Role / Timing Role: Simultaneous 4-channel voltage digitization and periodic temperature sampling using shared serial bus and CONVST-triggered sequencing. Use Value: Reduces BOM count by integrating ADC + temp sensor + reference, while BUSY and OTI enable deterministic interrupt-driven firmware. |
Use Scenario: Closed-loop cabin temperature regulation using thermistor feedback and HVAC actuator control in entry-level vehicles. IC Role / Device Role / Timing Role: Primary ambient temperature sensor (Channel 0) with redundant voltage monitoring (VIN1–VIN4) for fan speed, heater voltage, and sensor health checks. Use Value: Single-chip solution meets ASIL-B functional safety requirements for non-critical thermal monitoring with hardware OTI fail-safe signaling. |
| Battery Management Systems | Data Acquisition Modules |
|
Use Scenario: Monitoring cell voltage, pack current sense, and ambient temperature in portable medical device battery packs. IC Role / Device Role / Timing Role: Low-power 10-bit ADC acquiring temperature and analog signals at 10–100 SPS with automatic sleep/wake cycles controlled by CONVST timing. Use Value: 4 μW power at 10 SPS extends runtime in coin-cell-powered devices; on-chip reference removes calibration drift from external components. |
Use Scenario: Compact USB- or RS-485-connected DAQ units for lab equipment and field instrumentation. IC Role / Device Role / Timing Role: Front-end signal conditioner converting four analog sensor outputs and local temperature into synchronized digital streams for microcontroller aggregation. Use Value: 9 μs conversion time supports >100 kSPS aggregate sampling; SOIC-16 footprint simplifies PCB layout and rework compared to QFN alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel ADC with integrated temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7818ARZ | Single-channel variant (1 VIN + temp sensor); identical 10-bit resolution, 9 μs conversion, same SOIC-8 package; lacks VIN2–VIN4 and CS pin. | Used where only one analog input is needed alongside temperature; lower pin count reduces board space but eliminates multiplexed sensing capability. | Select AD7818ARZ when system requires only one analog channel and minimal footprint; AD7817BR-REEL7 remains optimal for 4-input designs. |
| MAX1241ACPP+ | 12-bit, single-channel ADC with internal reference and temp sensor; SPI interface; 2.7 V–5.25 V supply; no OTI pin; 10 μs conversion time. | Higher resolution but no overtemperature hardware alert; requires external logic or firmware polling for thermal fault detection. | Choose MAX1241ACPP+ only if 12-bit precision outweighs loss of OTI functionality and 4-channel support; AD7817BR-REEL7 offers superior integration for thermal-aware multichannel systems. |
Compared with AD7817BR-REEL7, AD7818ARZ trades channel count for smaller size and lower cost in single-input use cases, while MAX1241ACPP+ increases resolution at the expense of missing hardware thermal alerting and multiplexing-making AD7817BR-REEL7 uniquely balanced for compact, thermally aware multichannel acquisition.
Availability
AD7817BR-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, automotive cabin climate control, battery management systems, and portable data acquisition modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7817BR-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, with design and manufacturing operations worldwide.
The AD7817BR-REEL7 belongs to Analog Devices' precision data acquisition IC family, engineered for embedded systems requiring simultaneous analog voltage measurement and accurate ambient temperature sensing in resource-constrained environments.
FAQ
What is the conversion time of AD7817BR-REEL7 for analog input channels?
The AD7817BR-REEL7 achieves a fixed 9 μs conversion time for VIN1 through VIN4. This value is specified across all operating conditions (2.7 V–5.5 V, −40°C to +85°C) and reflects the time from CONVST falling edge to BUSY deassertion. Temperature sensor (Channel 0) conversion takes 27 μs. These times are independent of external clock source due to the on-chip oscillator.
Does AD7817BR-REEL7 require an external reference voltage?
No, AD7817BR-REEL7 does not require an external reference. It includes an on-chip 2.5 V ±1% reference that activates automatically when the REFIN pin is tied to AGND. An external 2.5 V reference may be applied to REFIN for improved accuracy, but doing so disables the internal reference. The AD7817BR-REEL7 datasheet specifies ±2°C temperature accuracy with the internal reference active.
How is the overtemperature indicator (OTI) pin used in AD7817BR-REEL7?
The OTI pin on AD7817BR-REEL7 is an active-low, open-drain output that asserts logic low when the temperature sensor reading (Channel 0) exceeds the value stored in the 8-bit overtemperature register (OTR). It resets automatically after a serial read operation (rising edge of RD/WR with CS low). No external pull-up is strictly required but recommended for robust noise immunity in industrial environments.
What package type is AD7817BR-REEL7 supplied in?
AD7817BR-REEL7 is supplied in a 16-lead narrow-body SOIC package (0.15 inch width), RoHS-compliant, and shipped on a 1,000-unit tape-and-reel (REEL7 designation). This package features separate AGND and DGND pins, optimized for mixed-signal noise isolation, and is compatible with standard SOIC-16 footprints and reflow profiles.
Can AD7817BR-REEL7 operate from a 3.3 V supply?
Yes, AD7817BR-REEL7 fully supports 3.3 V operation. Its supply range is 2.7 V to 5.5 V, and all specifications-including 9 μs conversion time, ±2°C temperature accuracy, and serial interface timing-are guaranteed at 3.3 V. Logic thresholds scale accordingly: VINH = 2.0 V min and VINL = 0.4 V max at VDD = 3 V ±10%, ensuring reliable interfacing with 3.3 V microcontrollers.
AD7817BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- ±2.25°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-SOIC
AD7817BR-REEL7 FAQ
1.How can I place an order for AD7817BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7817BR-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 AD7817BR-REEL7 reliable?
The price and inventory of AD7817BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7817BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7817BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7817BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7817BR-REEL7?
AD7817BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7817BR-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 AD7817BR-REEL7?
For technical support, including AD7817BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7817BR-REEL7 requirements.
6.How does Aetrix verify that AD7817BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7817BR-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 AD7817BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7817BR-REEL7?
All AD7817BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7817BR-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 AD7817BR-REEL7 part is unused and in its original packaging.
Return procedure for AD7817BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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