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Analog Devices Inc. AD7817ARZ-REEL7
- Part No.:
- AD7817ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7817ARZ-REEL7.pdf
- Description:
- SENSOR DIGITAL -40C-85C 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,139
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Product details
Overview
AD7817ARZ-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 reference (±1%), and −55°C to +125°C operating range. It delivers ±2°C temperature accuracy over −40°C to +85°C and supports industrial process control with flexible SPI/MICROWIRE/8051-compatible serial interface.
For engineers reviewing the AD7817ARZ-REEL7 datasheet, AD7817ARZ-REEL7 pinout, AD7817ARZ-REEL7 application, or AD7817ARZ-REEL7 equivalent, key selection criteria include its 4-channel single-ended analog input architecture, on-chip temperature sensor accessible via Channel 0, automatic power-down mode (4 μW at 10 SPS), and SOIC-16 narrow-body package compatibility with legacy PCB layouts.
Technical Context
The AD7817ARZ-REEL7 implements a capacitor-based successive approximation register (SAR) ADC core with inherent track-and-hold functionality and an internal clock oscillator. Its conversion engine operates independently of external timing sources, enabling deterministic 9 μs channel conversions and 27 μs temperature sensor readings.
It integrates dual ground domains (AGND/DGND), a programmable overtemperature indicator (OTI) driven by digital comparison against an on-chip 8-bit overtemperature register, and a flexible serial interface supporting read/write operations via separate DIN/DOUT lines and RD/WR polarity control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees monotonic output and no missing codes across full operating range. |
| Conversion Time | 9 μs for VIN1–VIN4 - enables 100 kSPS throughput per channel without external timing constraints. |
| Temperature Accuracy | ±2°C from −40°C to +85°C - validated using on-chip sensor with 0.25°C LSB resolution. |
| Supply Range | 2.7 V to 5.5 V - supports direct interface with 3.3 V and 5 V microcontroller systems. |
| Reference | On-chip 2.5 V ±1% - eliminates need for external reference; shuts down when REFIN is externally driven. |
| Power Consumption | 4 μW at 10 SPS - achieved via automatic power-down after conversion completion. |
| Interface Protocol | SPI/MICROWIRE/8051-compatible - uses CS, SCLK, RD/WR, DIN, DOUT with edge-triggered timing. |
Pinout & Package
AD7817ARZ-REEL7 is housed in a 16-lead narrow-body SOIC (0.15 inch width) with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal impedance θJA = 100°C/W; max power dissipation = 450 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered signal initiating conversion and placing track-and-hold into hold mode; low state at conversion end triggers auto power-down. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion; used for interrupt-driven MCU synchronization. |
| OTI | Overtemperature Indicator | Active-low output asserting when Channel 0 (temperature sensor) reading exceeds value in on-chip OTR register; resets on rising RD/WR edge during CS low. |
| CS | Chip Select Input | Enables serial port only when low; required for multi-device SPI bus sharing. |
| 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; voltage range = 0 V to VREF; selected via 3-bit address register. |
| DOUT | Serial Data Output | High-impedance tri-state output releasing bus on falling RD/WR or rising CS for shared-bus operation. |
| 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 each serial frame. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | Direct access via Channel 0 with ±2°C accuracy and 0.25°C resolution enables ambient monitoring without external sensors or calibration. |
| Automatic Power-Down | Reduces IDD to 4 μA typical at 3 V after conversion, cutting idle power by >99% versus continuous operation - critical for battery-powered DAQ. |
| On-Chip 2.5 V Reference | Stable ±1% initial tolerance and 80 ppm/°C tempco eliminates BOM cost and layout area for external reference ICs. |
| Overtemperature Indicator (OTI) | Dedicated hardware comparator compares Channel 0 result against user-programmable OTR register, providing immediate fault signaling without MCU intervention. |
| Inherent Track-and-Hold | Eliminates need for external sample-and-hold circuitry; 400 ns acquisition time ensures accurate sampling even after channel switching or input transients. |
Applications
| Industrial Process Monitoring | Automotive Cabin Climate Control |
|---|---|
|
Use Scenario: Real-time monitoring of multiple sensor signals (pressure, flow, humidity) alongside ambient temperature in PLC I/O modules. IC Role / Device Role / Timing Role: 4-channel ADC digitizes analog sensor outputs while Channel 0 concurrently measures local board temperature for thermal derating compensation. Use Value: Single-chip integration reduces component count by 5+ parts (separate temp sensor, reference, mux, ADC), lowering system BOM cost and improving long-term calibration stability. |
Use Scenario: Closed-loop HVAC control in automotive infotainment head units requiring cabin air temperature feedback and auxiliary sensor inputs. IC Role / Device Role / Timing Role: Digitizes thermistor voltage (Channel 0) and potentiometer position (Channel 1) with synchronized 9 μs conversions, feeding real-time PID calculations in MCU. Use Value: −55°C to +125°C operating range and ±2°C temp accuracy ensure reliable operation across vehicle cold-soak and hot-soak conditions without external compensation. |
| Battery-Powered Data Loggers | Industrial Battery Charging Systems |
|
Use Scenario: Portable environmental monitors logging temperature and analog sensor data over weeks on coin-cell batteries. IC Role / Device Role / Timing Role: Enters auto power-down after each 10 SPS conversion, drawing only 4 μW average power while maintaining full 10-bit resolution and 0.25°C thermal resolution. Use Value: Ultra-low idle power extends battery life >10× versus comparable ADCs lacking integrated power management, eliminating need for external enable sequencing. |
Use Scenario: Smart battery chargers measuring cell voltage, current sense amplifier output, and thermal foldback thresholds. IC Role / Device Role / Timing Role: Simultaneously samples voltage (VIN1), current (VIN2), and NTC thermistor (VIN3) with channel isolation >80 dB, preventing cross-talk induced charging errors. Use Value: High channel-to-channel isolation and inherent track-and-hold eliminate need for external analog switches or guard traces, simplifying high-accuracy current sensing layout. |
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 (VIN1 only), identical 10-bit SAR core, same 9 μs conversion time and ±2°C temperature accuracy, but lacks VIN2–VIN4 and associated MUX logic. | Used where only one analog input + temperature is required; smaller 8-lead SOIC footprint saves board space but removes multiplexing capability. | Select AD7818ARZ when system requires only one analog channel and minimal footprint; AD7817ARZ-REEL7 remains optimal for 4-channel consolidation. |
| MAX1248BCAP+ | 12-bit resolution, 4-channel, SPI interface, but no integrated temperature sensor; requires external thermal diode or NTC for temperature measurement. | Preferred in precision measurement applications needing >10-bit resolution, but adds BOM cost and calibration complexity for thermal monitoring. | Choose MAX1248BCAP+ only if 12-bit resolution is mandatory and external temperature sensing is acceptable; AD7817ARZ-REEL7 provides tighter thermal integration at 10-bit. |
Compared with AD7818ARZ, AD7817ARZ-REEL7 adds three extra analog inputs and internal MUX control without increasing supply current or conversion latency; compared with MAX1248BCAP+, it trades 2 bits of resolution for monolithic temperature sensing, reducing total system component count and calibration overhead.
Availability
AD7817ARZ-REEL7 is available at Aetrix Electronics and suitable for industrial process control, automotive cabin monitoring, battery-powered data loggers, and smart battery charging systems requiring stable component supply and long-term obsolescence management.
Supply support for AD7817ARZ-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 worldwide and ISO 9001-certified manufacturing.
The AD7817 belongs to Analog Devices' precision data acquisition ADC family, engineered for embedded systems requiring simultaneous analog sensing and ambient temperature awareness in harsh industrial and automotive environments.
FAQ
What is the conversion time for the temperature sensor channel in AD7817ARZ-REEL7?
The AD7817ARZ-REEL7 requires 27 μs to complete a conversion on Channel 0 (temperature sensor), which is longer than the 9 μs needed for VIN1–VIN4 due to internal sensor settling and charge redistribution timing. This value is specified across all versions (A/B/S) and operating conditions in the Rev. E datasheet Table 1.
Does AD7817ARZ-REEL7 require an external reference voltage?
No, AD7817ARZ-REEL7 includes an on-chip 2.5 V reference with ±1% initial accuracy and 80 ppm/°C temperature coefficient. To enable it, tie the REFIN pin to AGND. An external 2.5 V reference may be applied to REFIN only if higher precision is required, which disables the internal reference.
How is the overtemperature indicator (OTI) pin configured in AD7817ARZ-REEL7?
The OTI pin in AD7817ARZ-REEL7 is an active-low, open-drain output that asserts when the Channel 0 temperature reading exceeds the value stored in the on-chip 8-bit overtemperature register (OTR). It resets automatically on the rising edge of RD/WR while CS is low, requiring no software clear command.
What package type does AD7817ARZ-REEL7 use, and is it RoHS compliant?
AD7817ARZ-REEL7 uses a 16-lead narrow-body SOIC package (JEDEC MS-012AC, 0.15 inch width) with lead (Pb)-free finish and RoHS compliance per EU Directive 2011/65/EU. The "-REEL7" suffix indicates tape-and-reel packaging optimized for automated SMT assembly.
Can AD7817ARZ-REEL7 operate from a 3.3 V supply, and what is its typical current draw?
Yes, AD7817ARZ-REEL7 operates from 2.7 V to 5.5 V. At 3.3 V supply and normal operation with external reference, typical IDD is 1.75 mA. In auto power-down mode at 10 SPS throughput, it draws only 6.4 μW - equivalent to ~1.9 μA average current - making it suitable for ultra-low-power designs.
AD7817ARZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
AD7817ARZ-REEL7 FAQ
1.How can I place an order for AD7817ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7817ARZ-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 AD7817ARZ-REEL7 reliable?
The price and inventory of AD7817ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7817ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7817ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7817ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7817ARZ-REEL7?
AD7817ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7817ARZ-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 AD7817ARZ-REEL7?
For technical support, including AD7817ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7817ARZ-REEL7 requirements.
6.How does Aetrix verify that AD7817ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7817ARZ-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 AD7817ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7817ARZ-REEL7?
All AD7817ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7817ARZ-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 AD7817ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7817ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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