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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Analog Devices Inc. ADT7318ARQZ-REEL

Name: ADT7318ARQZ-REEL
Brand: Analog Devices Inc.
SKU: ADT7318ARQZ-REEL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADT7318ARQZ-REEL

Manufacturer:: Analog Devices Inc.

Category:: Analog and Digital Output

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: ADT7318ARQZ-REEL.pdf

Description:: IC SENSOR TEMP QUAD DAC 16QSOP

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Product details

Overview

ADT7318ARQZ-REEL 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/B/C/D), operates from 2.7 V to 5.5 V, and supports both I²C and SPI serial interfaces. It is used in thermal management systems for PC power regulation and embedded sensor calibration.

For engineers reviewing the ADT7318ARQZ-REEL datasheet, ADT7318ARQZ-REEL pinout, ADT7318ARQZ-REEL application, or ADT7318ARQZ-REEL 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 legacy and low-pin-count designs.

Technical Context

The ADT7318ARQZ-REEL integrates a 10-bit temperature-to-digital converter (0.25°C resolution) with four independent 8-bit DACs sharing two 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 monitoring. The device supports round-robin measurement across VDD, internal temperature, and external temperature channels.

It implements double-buffered input logic and software/hardware LDAC control for synchronized DAC updates. Reference configuration supports buffered (1 V to VDD) or unbuffered (0.25 V to VDD) modes per DAC pair, and the rail-to-rail output amplifier ensures full-scale compliance across supply voltages. Power-down current is <10 μA, enabling battery-sensitive applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Accuracy	±0.5°C (0°C to +85°C, VDD = 3.3 V ±10%), enabling precise thermal thresholding without external calibration.
DAC Resolution	8 bits (ADT7318 variant), supporting 256 discrete output levels per channel for coarse but deterministic analog control.
DAC Output Settling Time	Typically 7 μs (1/4 to 3/4 scale), allowing rapid response in closed-loop feedback or dynamic bias adjustment.
Supply Voltage Range	2.7 V to 5.5 V, compatible with both 3.3 V and 5 V system rails without level-shifting circuitry.
Interface Support	I²C (fast-mode, 400 kHz) and 4-wire SPI (QSPI/MICROWIRE/DSP-compatible), providing design flexibility across host controller types.
Power-Down Current	<10 μA, reducing quiescent load in sleep-mode systems such as portable instrumentation or standby controllers.
Reference Options	Internal 2.28 V ±0.0138 V or external reference via VREF-AB/VREF-CD pins, simplifying BOM by eliminating external reference ICs when precision allows.

Pinout & Package

ADT7318ARQZ-REEL is housed in a 16-lead QSOP (Quarter-Size Outline Package) with 0.65 mm lead pitch and standard JEDEC MO-137AC footprint. The package is RoHS-compliant and qualified for industrial temperature operation (−40°C to +120°C).

Pin/Terminal	Circuit Role	Design Meaning
VOUT-A	Analog output of DAC A	Rail-to-rail buffered voltage source; drives loads up to 25 mA at 5 V, usable for biasing, calibration, or sensor excitation.
VOUT-B	Analog output of DAC B	Independent of VOUT-A; shares VREF-AB reference; supports matched dual-channel control (e.g., differential sensor bias).
VREF-AB	Reference input for DAC A and B	Selectable buffered/unbuffered mode; defines 0–2×VREF output range; decoupling required for noise-sensitive applications.
CS	SPI chip select	Active-low frame sync; must be held high during I²C operation to avoid bus contention.
GND	Analog/digital ground reference	Single-point connection point for all internal circuitry; requires low-impedance PCB return path to minimize noise coupling.
VDD	Positive supply rail	2.7–5.5 V input; must be decoupled with ≥1 μF ceramic capacitor near pin to suppress switching transients.
D+	External sensor positive terminal	Connects to collector of PNP transistor (e.g., 2N3906); enables remote temperature sensing up to 120°C.
D−	External sensor negative terminal	Connects to emitter of same PNP transistor; forms diode-connected junction for ΔV_BE-based measurement.
LDAC	Load DAC active-low control	Falling-edge triggered; synchronizes all four DAC outputs simultaneously-critical for coordinated actuator control.
INT/INT	Over-limit interrupt output	Open-drain, polarity-configurable; asserts on VDD, internal, or external temperature limit violation; requires external pull-up.
DOUT/ADD	SPI data out / I²C address select	Dual-function: SPI serial output (falling-edge clocked) or I²C slave address bit (low/float/high = 0x48/0x4A/0x4B).
SDA/DIN	I²C data / SPI data in	Open-drain bidirectional I²C data line or SPI serial input (rising-edge clocked); shared pin mandates interface mode selection.
SCL/SCLK	I²C clock / SPI clock	Shared serial clock input; open-drain I²C mode requires pull-up; SPI mode uses edge-triggered timing per Figure 7.
VREF-CD	Reference input for DAC C and D	Independent of VREF-AB; enables split-reference architecture-for example, one pair for sensor bias, another for actuator drive.
VOUT-D	Analog output of DAC D	Final channel in quad set; identical specs to VOUT-A/B/C; supports independent control of fourth subsystem (e.g., fan speed, LED dimming).
VOUT-C	Analog output of DAC C	Paired with VOUT-D under VREF-CD; supports simultaneous update with LDAC; no crosstalk penalty beyond specified 200 μV DC error.

Key Features

Feature	Design Value
Guaranteed monotonic DAC transfer	Ensures no code-dependent output reversal across full 8-bit range-critical for stable PID loop control and calibration ramps.
Simultaneous LDAC-triggered update	Enables atomic, glitch-free coordination of all four DAC outputs-essential for multi-axis motor bias or synchronized sensor excitation.
Integrated 10-bit temperature ADC	Delivers 0.25°C resolution and ±0.5°C accuracy (0°C to +85°C), eliminating need for external ADC in thermal monitoring subsystems.
Two independent reference domains	VREF-AB and VREF-CD allow isolated voltage scaling per DAC pair-supporting mixed-signal applications like dual-range sensor conditioning.
Low-power shutdown mode	Reduces current draw to <10 μA while preserving register state, enabling energy-efficient wake-on-event thermal supervision.
I²C + SPI dual-interface support	Eliminates interface redesign when migrating between microcontroller families-supports both resource-constrained I²C hosts and high-speed SPI controllers.

Applications

PC Power Management	Industrial Sensor Calibration
Use Scenario: Real-time thermal throttling and VRM margining in desktop and server motherboards. IC Role / Device Role / Timing Role: Monitors CPU die temperature and generates programmable bias voltages for voltage regulator feedback networks. Use Value: Enables adaptive power delivery using on-die temperature data and four independent DAC outputs to fine-tune multiple VRM parameters concurrently.	Use Scenario: Factory calibration of multi-channel pressure or flow sensors in test fixtures. IC Role / Device Role / Timing Role: Provides traceable, stable reference voltages for sensor zero/span adjustment and temperature compensation lookup tables. Use Value: Reduces calibration time and fixture complexity by integrating temperature sensing and four-channel analog stimulus in one IC.
Telecom Line Card Monitoring	Smart Appliance Thermal Control
Use Scenario: Monitoring ambient and component temperatures on high-density optical line cards with limited board space. IC Role / Device Role / Timing Role: Measures local board temperature and drives thermoelectric cooler (TEC) bias, laser bias, and monitor photodiode offset correction. Use Value: Consolidates five functions (temp sensing + 4 DACs) into one 16-pin QSOP, freeing PCB area for signal integrity-critical RF routing.	Use Scenario: Closed-loop temperature regulation in premium refrigerators, ovens, and HVAC controllers. IC Role / Device Role / Timing Role: Reads internal cabinet temperature and controls compressor ramp rate, defrost heater duty cycle, and fan speed via analog outputs. Use Value: Achieves ±0.5°C thermal stability using internal sensor accuracy and monotonic DACs-reducing reliance on costly external precision components.

PC Power Management

Industrial Sensor Calibration

Use Scenario: Real-time thermal throttling and VRM margining in desktop and server motherboards.

IC Role / Device Role / Timing Role: Monitors CPU die temperature and generates programmable bias voltages for voltage regulator feedback networks.

Use Value: Enables adaptive power delivery using on-die temperature data and four independent DAC outputs to fine-tune multiple VRM parameters concurrently.

Use Scenario: Factory calibration of multi-channel pressure or flow sensors in test fixtures.

IC Role / Device Role / Timing Role: Provides traceable, stable reference voltages for sensor zero/span adjustment and temperature compensation lookup tables.

Use Value: Reduces calibration time and fixture complexity by integrating temperature sensing and four-channel analog stimulus in one IC.

Telecom Line Card Monitoring

Smart Appliance Thermal Control

Use Scenario: Monitoring ambient and component temperatures on high-density optical line cards with limited board space.

IC Role / Device Role / Timing Role: Measures local board temperature and drives thermoelectric cooler (TEC) bias, laser bias, and monitor photodiode offset correction.

Use Value: Consolidates five functions (temp sensing + 4 DACs) into one 16-pin QSOP, freeing PCB area for signal integrity-critical RF routing.

Use Scenario: Closed-loop temperature regulation in premium refrigerators, ovens, and HVAC controllers.

IC Role / Device Role / Timing Role: Reads internal cabinet temperature and controls compressor ramp rate, defrost heater duty cycle, and fan speed via analog outputs.

Use Value: Achieves ±0.5°C thermal stability using internal sensor accuracy and monotonic DACs-reducing reliance on costly external precision components.

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
ADT7317ARQZ-REEL	10-bit DAC resolution (vs. 8-bit), higher relative accuracy (±0.5 LSB vs. ±0.15 LSB), same pinout and interface.	Better suited for applications requiring finer analog control granularity, e.g., high-resolution sensor linearization or precision actuator positioning.	Select ADT7317ARQZ-REEL when 10-bit resolution and improved INL justify cost and layout compatibility.
ADT7316ARQZ-REEL	12-bit DAC resolution, wider relative accuracy spec (±2 LSB), identical thermal performance and package.	Targeted at metrology-grade calibration systems where 12-bit monotonicity and sub-mV output resolution are mandatory.	Choose ADT7316ARQZ-REEL only if full 12-bit performance is required and system firmware supports extended register addressing.

Compared with ADT7317ARQZ-REEL and ADT7316ARQZ-REEL, the ADT7318ARQZ-REEL provides optimal cost-performance balance for applications needing reliable 8-bit analog control and accurate thermal monitoring without over-specifying DAC resolution.

Availability

ADT7318ARQZ-REEL is available at Aetrix Electronics and suitable for PC power management, industrial sensor calibration, telecom line card monitoring, and smart appliance thermal control requiring stable component supply across production lifecycles.

Supply support for ADT7318ARQZ-REEL 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 ADT7316/ADT7317/ADT7318 family was designed to integrate precision temperature sensing and multi-channel DAC functionality for compact, low-power thermal management and calibration subsystems in computing, industrial, and consumer equipment.

FAQ

What is the temperature accuracy specification of the ADT7318ARQZ-REEL over its full operating range?

The ADT7318ARQZ-REEL achieves ±0.5°C accuracy over 0°C to +85°C at VDD = 3.3 V ±10%, and ±2°C to ±5°C over the full −40°C to +120°C range depending on supply voltage and averaging mode. This is measured using the internal bandgap sensor with on-chip 10-bit ADC and factory calibration.

Does the ADT7318ARQZ-REEL support simultaneous update of all four DAC outputs?

Yes, the ADT7318ARQZ-REEL supports simultaneous DAC output update via its LDAC (Load DAC) pin or software command. A falling edge on the LDAC pin transfers data from input registers to DAC registers atomically-ensuring glitch-free, coordinated behavior across VOUT-A, VOUT-B, VOUT-C, and VOUT-D.

Can the ADT7318ARQZ-REEL operate with only the internal reference, and what is its nominal value?

Yes, the ADT7318ARQZ-REEL includes an internal 2.28 V reference (2.2662 V to 2.2938 V, ±0.6% tolerance) that can be selected for DAC operation, eliminating the need for external reference components. This internal reference is used by default unless external references are applied to VREF-AB or VREF-CD pins.

What serial interfaces does the ADT7318ARQZ-REEL support, and are they mutually exclusive?

The ADT7318ARQZ-REEL supports both I²C (fast-mode, 400 kHz) and 4-wire SPI (QSPI/MICROWIRE/DSP-compatible) on shared pins. Interface selection is hardware-determined: CS high enables I²C mode; CS low enables SPI mode. They are mutually exclusive per power-on cycle and require no firmware reconfiguration.

How does the ADT7318ARQZ-REEL handle external temperature sensing, and what transistor is recommended?

The ADT7318ARQZ-REEL supports external temperature sensing via D+ and D− pins using a PNP transistor junction (e.g., 2N3906). It measures ΔV_BE across the transistor to derive temperature, achieving ±3°C accuracy from 0°C to +85°C. The device handles bias current generation and ADC conversion internally-no external current source required.

ADT7318ARQZ-REEL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Bulk

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

ADT7318ARQZ-REEL FAQ

1.How can I place an order for ADT7318ARQZ-REEL through Aetrix?

Please submit a Request for Quotation (RFQ) for ADT7318ARQZ-REEL 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 ADT7318ARQZ-REEL reliable?

The price and inventory of ADT7318ARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7318ARQZ-REEL is usually 5 days.

3.What payment methods are accepted for ADT7318ARQZ-REEL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7318ARQZ-REEL transactions.

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4.How is shipping managed for ADT7318ARQZ-REEL?

ADT7318ARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADT7318ARQZ-REEL 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 ADT7318ARQZ-REEL?

For technical support, including ADT7318ARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7318ARQZ-REEL requirements.

6.How does Aetrix verify that ADT7318ARQZ-REEL is sourced from the original manufacturer or authorized distributors?

All ADT7318ARQZ-REEL 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 ADT7318ARQZ-REEL meets industry standards.

7.What is the process for return or replacement of ADT7318ARQZ-REEL?

All ADT7318ARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7318ARQZ-REEL, 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 ADT7318ARQZ-REEL part is unused and in its original packaging.

Return procedure for ADT7318ARQZ-REEL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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