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Analog Devices Inc. ADT7318ARQ
- Part No.:
- ADT7318ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7318ARQ.pdf
- Description:
- IC DGTL TEMP SNSR QUAD DAC16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
ADT7318ARQ from Analog Devices is an integrated digital temperature sensor and quad 8-bit voltage-output DAC in a single 16-lead QSOP package. It delivers ±0.5°C temperature accuracy over −40°C to +120°C, features four buffered rail-to-rail analog outputs (VOUT-A to VOUT-D), operates from 2.7 V to 5.5 V, and supports both I²C and SPI serial interfaces. It is used in thermal monitoring and precision bias control within PC power management subsystems.
For engineers reviewing the ADT7318ARQ datasheet, ADT7318ARQ pinout, ADT7318ARQ application, or ADT7318ARQ equivalent, key selection criteria include its guaranteed monotonic 8-bit DAC performance, internal 2.28 V reference option, simultaneous LDAC-triggered output update, and dual-interface flexibility for embedded thermal control and analog calibration systems.
Technical Context
The ADT7318ARQ integrates a 10-bit temperature-to-digital converter (0.25°C resolution) with four independent 8-bit DACs sharing two configurable reference inputs (VREF-AB and VREF-CD). Its on-chip bandgap sensor digitizes die temperature, while external transistor sensing (via D+/D− pins) enables remote thermal measurement.
It implements double-buffered input registers and supports simultaneous output update via LDAC pin or software command. The device includes interrupt generation (INT/INT) on temperature or VDD limit violations, programmable averaging, and power-down mode drawing <10 μA - enabling low-power thermal supervision in battery-operated instruments and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Accuracy | ±0.5°C over 0°C to +85°C - enables direct replacement of thermistors in closed-loop thermal regulation without calibration. |
| DAC Resolution | 8 bits - provides 256 discrete output levels per channel for coarse but deterministic analog biasing. |
| DAC Output Range | 0 V to 2×VREF - supports full-scale output up to 4.56 V when using internal 2.28 V reference at 5.5 V supply. |
| Settling Time | 7 μs typical (1/4 to 3/4 scale) - ensures fast response for dynamic calibration sequences in test equipment. |
| Supply Voltage | 2.7 V to 5.5 V - interoperates with both 3.3 V and 5 V logic domains without level-shifting. |
| Interface Support | I²C (fast-mode, 400 kHz) and 4-wire SPI - allows integration into either microcontroller-based or FPGA-controlled systems. |
| Power-Down Current | <10 μA - extends battery life in portable instruments during idle thermal sampling intervals. |
Pinout & Package
ADT7318ARQ is housed in a 16-lead QSOP (Quarter-Size Outline Package) with 0.65 mm lead pitch and exposed pad not present. Pin functions are validated per Analog Devices Rev. B datasheet Figure 9 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT-A | DAC A analog output | Rail-to-rail buffered voltage source; drives loads ≥2 kΩ without gain error degradation. |
| VOUT-B | DAC B analog output | Independent buffered output; shares VREF-AB reference with DAC A for matched scaling. |
| VREF-AB | Reference input for DAC A/B | Configurable buffered/unbuffered input; 1 V to VDD range (buffered) or 0.25 V to VDD (unbuffered). |
| CS | SPI chip select | Active-low frame sync; must be held high in I²C mode to prevent interface conflict. |
| GND | Analog/digital common ground | Single-point reference for all internal circuitry; requires low-impedance PCB connection. |
| VDD | Positive supply | 2.7 V–5.5 V input; decoupling capacitor mandatory near pin for ADC/DAC stability. |
| D+ | External sensor positive | Connects to collector of PNP transistor (e.g., 2N3906) for remote temperature sensing. |
| D− | External sensor negative | Connects to emitter of same PNP transistor; forms diode-connected junction for ΔVBE measurement. |
| LDAC | Load DAC control | Falling-edge triggered; updates all DAC registers simultaneously when enabled in Control Config 3 register. |
| INT/INT | Over-limit interrupt | Open-drain output; active-low by default; asserts when internal temp, external temp, or VDD exceeds programmed thresholds. |
| DOUT/ADD | SPI data out / I²C address | Shared pin: outputs register data in SPI; sets LSB of 7-bit I²C address (10010xx) when floating/high/low. |
| SDA/DIN | I²C data / SPI data in | Open-drain bidirectional I²C bus line; SPI data input clocked on SCL/SCLK rising edge. |
| SCL/SCLK | I²C clock / SPI clock | Shared serial clock; open-drain I²C requires pull-up; SPI uses edge-triggered timing per Figure 7. |
| VREF-CD | Reference input for DAC C/D | Independent reference path from VREF-AB; enables differential or split-reference configurations. |
| VOUT-D | DAC D analog output | Buffered rail-to-rail output; shares VREF-CD with DAC C; supports independent voltage programming. |
| VOUT-C | DAC C analog output | Final DAC channel; fully isolated in layout from VOUT-A/B to minimize crosstalk (<1 μV dc). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed monotonic DAC transfer | Ensures no code-dependent output reversal across full 0–255 range - critical for stable feedback loops. |
| Internal 2.28 V reference | Eliminates need for external precision reference; reduces BOM count and layout area in space-constrained designs. |
| Simultaneous LDAC update | Enables synchronized step-response across all four outputs - essential for multi-channel calibration sweeps. |
| On-chip rail-to-rail output buffers | Drives capacitive loads up to 200 pF directly; avoids external op-amps in low-bandwidth bias applications. |
| Power-on reset to 0 V | Prevents undefined DAC states at startup; guarantees safe initial condition before firmware initialization. |
Applications
| PC Power Management | Industrial Process Monitoring |
|---|---|
Use Scenario: Real-time CPU/core temperature monitoring and dynamic fan speed/voltage control in desktop and server motherboards. IC Role / Device Role / Timing Role: Temperature sensor provides die-temp feedback; DACs generate PWM-compatible bias voltages for VRM gate drivers and fan controller references. Use Value: ±0.5°C accuracy enables tighter thermal throttling margins; quad DACs allow independent control of multiple power rails without additional ICs. | Use Scenario: Closed-loop temperature regulation of heating elements in PLC-controlled HVAC or chemical reactors. IC Role / Device Role / Timing Role: Internal sensor monitors controller ambient; external sensor (2N3906) measures process fluid; DACs drive analog inputs of SSRs or 4–20 mA transmitters. Use Value: Single-chip integration reduces component count and improves long-term drift stability vs. discrete sensor+DAC solutions. |
| Portable Test Equipment | Domestic Appliance Control |
Use Scenario: Battery-powered multimeter or calibrator requiring self-contained thermal compensation and analog output generation. IC Role / Device Role / Timing Role: Measures internal temperature for ADC offset correction; DACs produce precision DC test voltages (e.g., 1.25 V, 2.5 V) for probe calibration. Use Value: <10 μA power-down current extends battery life; 7 μs DAC settling supports rapid auto-ranging sequences. | Use Scenario: Smart oven or refrigerator with cavity temperature sensing and heater/cooler actuator control. IC Role / Device Role / Timing Role: Internal sensor tracks control board temperature; external sensor monitors food compartment; DACs set reference voltages for comparator-based thermostat logic. Use Value: Integrated interrupt (INT/INT) triggers immediate shutdown on overtemperature; eliminates need for external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-sensing and multi-channel DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7317ARQ | 10-bit DAC resolution (vs. 8-bit); ±0.5 LSB relative accuracy; higher DAC precision at cost of reduced code density. | Better suited for applications requiring finer analog tuning steps (e.g., optical module bias control), but consumes more MCU resources for calibration tables. | Select ADT7317ARQ only if 10-bit granularity is required and system firmware can accommodate larger DAC code handling. |
| MAX5124ETE+ | Quad 8-bit DAC only - no integrated temperature sensor; uses separate 2.5 V reference; SPI-only interface. | Requires external temperature sensor (e.g., MAX31820) and reference IC; increases BOM and layout complexity for thermal-aware systems. | Choose MAX5124ETE+ only when temperature sensing is handled elsewhere and pure DAC density is prioritized over integration. |
Compared with ADT7318ARQ, ADT7317ARQ offers higher DAC resolution at the expense of lower code count per unit voltage step, while MAX5124ETE+ provides identical DAC capability but lacks on-chip thermal sensing - making ADT7318ARQ the optimal choice for space- and cost-sensitive thermal calibration nodes.
Availability
ADT7318ARQ is available at Aetrix Electronics and suitable for PC power management, industrial process monitoring, portable test equipment, domestic appliance control, and thermal calibration systems requiring stable component supply across production lifecycles.
Supply support for ADT7318ARQ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADT7316/ADT7317/ADT7318 product line was designed to integrate thermal sensing and multi-channel analog output generation into compact, low-power systems - targeting thermal management in computing, industrial automation, and consumer electronics.
FAQ
What is the maximum operating temperature range supported by the ADT7318ARQ?
The ADT7318ARQ supports an operating temperature range of −40°C to +120°C. Its internal temperature sensor achieves ±0.5°C accuracy from 0°C to +85°C and ±2°C accuracy across the full −40°C to +120°C range when powered at 3.3 V. This makes ADT7318ARQ suitable for under-hood automotive modules and industrial enclosures where ambient extremes are expected.
Does the ADT7318ARQ require an external reference voltage to operate?
No, the ADT7318ARQ does not require an external reference voltage. It includes an internal 2.28 V reference (±0.6% tolerance) that can be selected for all four DACs. Alternatively, external references may be applied to VREF-AB and VREF-CD pins, supporting buffered (1 V to VDD) or unbuffered (0.25 V to VDD) modes. The ADT7318ARQ defaults to internal reference on power-up.
How does the LDAC function work on the ADT7318ARQ?
The LDAC pin on the ADT7318ARQ is an active-low control input that transfers data from input registers to DAC registers. A falling edge with minimum 20 ns pulse width triggers simultaneous update of all four DAC outputs. This function is enabled by default via bit C3 in the Control Configuration 3 register. Software LDAC commands are also supported via SPI/I²C write to the LDAC Configuration register.
Can the ADT7318ARQ measure temperature using an external transistor?
Yes, the ADT7318ARQ supports external temperature measurement using a PNP transistor such as the 2N3906 connected between D+ and D− pins. The device measures the base-emitter voltage (ΔVBE) to derive temperature with ±3°C accuracy from 0°C to +85°C. External sensing extends monitoring beyond the die to heatsinks, motors, or fluid lines - a capability confirmed in the ADT7318ARQ's General Description and Table 1 specifications.
What serial interfaces does the ADT7318ARQ support, and how are they selected?
The ADT7318ARQ supports both I²C (fast-mode, 400 kHz) and 4-wire SPI interfaces. Interface selection is hardware-configured: CS pin must be tied high for I²C operation and driven low for SPI framing; SCL/SCLK and SDA/DIN pins serve dual roles. No configuration register setting is required - physical pin states determine active interface mode per the ADT7318ARQ's Pin Configuration and Functional Block Diagram.
ADT7318ARQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 120°C
- Sensing Temperature - Remote:
- -40°C ~ 120°C
- Output Type:
- I2C/SMBus, SPI
- Voltage - Supply:
- 2.7V ~ 5.25V
- Resolution:
- 8 b
- Features:
- Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C (±5°C)
- Test Condition:
- 0°C ~ 85°C (-40°C ~ 120°C)
- Operating Temperature:
- -40°C ~ 120°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QSOP
ADT7318ARQ FAQ
1.How can I place an order for ADT7318ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7318ARQ 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 ADT7318ARQ reliable?
The price and inventory of ADT7318ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7318ARQ is usually 5 days.
3.What payment methods are accepted for ADT7318ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7318ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7318ARQ?
ADT7318ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7318ARQ 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 ADT7318ARQ?
For technical support, including ADT7318ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7318ARQ requirements.
6.How does Aetrix verify that ADT7318ARQ is sourced from the original manufacturer or authorized distributors?
All ADT7318ARQ 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 ADT7318ARQ meets industry standards.
7.What is the process for return or replacement of ADT7318ARQ?
All ADT7318ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADT7318ARQ, 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 ADT7318ARQ part is unused and in its original packaging.
Return procedure for ADT7318ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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