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Analog Devices Inc. ADT7518ARQ
- Part No.:
- ADT7518ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7518ARQ.pdf
- Description:
- IC TEMP SNSR QUAD DAC 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
ADT7518ARQ from Analog Devices is a highly integrated mixed-signal IC combining a 10-bit temperature-to-digital converter, a 10-bit 4-channel ADC, and four 8-bit buffered voltage-output DACs in a single 16-lead QSOP package. It operates from 2.7 V to 5.5 V, delivers ±0.5°C internal temperature accuracy (0°C to +85°C), supports both SPI and I²C interfaces, and features simultaneous DAC output update via LDAC - enabling precise thermal monitoring and analog control in compact embedded systems such as smart battery chargers and telecom equipment.
For engineers reviewing the ADT7518ARQ datasheet, ADT7518ARQ pinout, ADT7518ARQ application, or ADT7518ARQ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready availability details - all grounded in Analog Devices' Rev. A datasheet and official functional descriptions.
Technical Context
The ADT7518ARQ integrates three independent data conversion subsystems: a bandgap-based 10-bit internal temperature sensor with 0.25°C resolution; a 10-bit SAR ADC supporting four single-ended analog inputs (AIN1–AIN4) with DC bandwidth and 0 V to 2.25 V input range; and four monotonic 8-bit string DACs with rail-to-rail buffered outputs, 0 V to VREF range, and simultaneous update capability via LDAC or software command.
It implements dual serial interface logic - a 4-wire SPI-compatible mode (CS/SCLK/SDA/DOUT) and a 2-wire SMBus/I²C mode (SCL/SDA) with programmable 7-bit address (via ADD pin), PEC support, and open-drain digital I/O requiring external pull-ups. Power management includes a 1 µA power-down mode and power-on reset forcing all DAC outputs to 0 V until first valid write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Accuracy | ±0.5°C (typ) from 0°C to +85°C using internal sensor - enables high-fidelity thermal feedback without external calibration. |
| ADC Resolution & Channels | 10-bit, 4-channel single-ended ADC - supports concurrent monitoring of VDD, internal temp, external transistor temp (D+/D−), and two auxiliary analog inputs (AIN3/AIN4). |
| DAC Resolution & Count | Four independent 8-bit voltage-output DACs - provides discrete analog control signals for biasing, calibration, or setpoint generation in multi-loop systems. |
| Serial Interface Support | SPI, I²C, SMBus, QSPI, MICROWIRE, and DSP-compatible - ensures drop-in compatibility across diverse host controller ecosystems. |
| Supply Voltage Range | 2.7 V to 5.5 V - allows direct integration into 3.3 V and 5 V systems without level-shifting or LDO overhead. |
| Power-Down Current | 1 µA - extends battery life in portable instruments during idle periods without losing register state. |
| Package | 16-lead QSOP - surface-mount compatible with standard reflow profiles and suitable for space-constrained PCB layouts. |
Pinout & Package
ADT7518ARQ 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. A datasheet Figure 7 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT-A (Pin 2) | DAC A buffered analog output | Rail-to-rail voltage source (0 V to VREF) - drives loads up to 25 mA at 5 V; requires no external buffer for typical sensor/actuator interfacing. |
| VOUT-B (Pin 1) | DAC B buffered analog output | Independent output with matched settling time (7 µs typ) - enables synchronized multi-channel analog control when updated via LDAC. |
| VREF-IN (Pin 3) | Reference input for all four DACs | Buffered 1 V to VDD input - accepts internal 2.25 V reference or external precision source; high impedance (>10 MΩ) minimizes loading effects. |
| CS (Pin 4) | SPI frame synchronization input | Active-low enable for serial data transfer - must be held high during I²C operation to prevent bus contention. |
| GND (Pin 5) | Analog/digital common ground | Single-point reference for all circuitry - requires low-impedance connection to system ground plane to maintain ADC/DAC accuracy. |
| VDD (Pin 6) | Positive supply input | 2.7 V to 5.5 V operation - decoupling capacitor (≥0.1 µF) mandatory near pin to suppress switching noise on shared supply rails. |
| D+/AIN1 (Pin 7) | External temp sensor (+) / ADC channel 1 | Connects to emitter of 2N3906 for external diode temp sensing; also serves as single-ended ADC input (0–2.25 V range). |
| D–/AIN2 (Pin 8) | External temp sensor (–) / ADC channel 2 | Differential pair with Pin 7 for remote junction temp measurement; doubles as second ADC input with same voltage range. |
| LDAC/AIN3 (Pin 9) | Simultaneous DAC update trigger / ADC channel 3 | Falling-edge activated; updates all DAC registers at once - critical for glitch-free multi-output control; also functions as third ADC input. |
| INT/INT (Pin 10) | Open-drain interrupt output | Configurable active-high/low alert for over-temp, over-VDD, or AIN limit violations - requires external pull-up resistor. |
| DOUT/ADD (Pin 11) | SPI data out / I²C address select | In SPI mode: serial data output (falling-edge clocked); in I²C mode: sets device address (1001000/010/011) based on logic level. |
| SDA/DIN (Pin 12) | I²C bidirectional data / SPI data in | Open-drain I²C data line or SPI serial input - rising-edge clocked in SPI; requires pull-up for proper bus operation. |
| SCL/SCLK (Pin 13) | I²C clock / SPI serial clock | Shared clock input for both interfaces - falling-edge data output (SPI), rising-edge sampling (I²C); open-drain with pull-up required. |
| AIN4 (Pin 14) | Fourth ADC input | Single-ended analog input (0–2.25 V) - completes 4-channel round-robin acquisition sequence with VDD, internal temp, and D+/D−. |
| VOUT-D (Pin 15) | DAC D buffered analog output | Final DAC output with identical specs to VOUT-A/B/C - supports full quad analog output capability without external components. |
| VOUT-C (Pin 16) | DAC C buffered analog output | Matched performance to other DAC outputs - enables independent control of four analog nodes (e.g., VCO tuning, LED current, sensor bias, reference trim). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous DAC update via LDAC | Ensures deterministic timing across all four outputs - eliminates inter-channel skew in closed-loop control applications like multi-zone thermal regulation. |
| Internal 2.25 V reference with 80 ppm/°C TC | Reduces BOM count by eliminating external reference IC - sufficient for <±1.5°C temp accuracy and 10-bit ADC linearity in non-critical applications. |
| Double-buffered DAC input registers | Prevents partial updates during serial writes - guarantees atomic register loading and avoids transient output glitches during configuration changes. |
| On-chip rail-to-rail output amplifiers | Delivers full-scale output swing (0 V to VREF) into 4.7 kΩ loads - eliminates need for external op-amps in most industrial and consumer signal conditioning paths. |
| SMBus packet error checking (PEC) | Enables robust communication in noisy environments - detects bit errors in I²C transactions without requiring host-side CRC implementation. |
| Power-on reset to 0 V DAC output | Guarantees safe startup state - prevents uncontrolled analog actuation during power ramp-up, critical for motor drivers and power supply sequencers. |
Applications
| Smart Battery Charger | Telecom Line Card |
|---|---|
|
Use Scenario: Real-time monitoring of battery cell temperature, pack voltage, and charging current while dynamically adjusting charge voltage/current profiles. IC Role / Device Role / Timing Role: ADT7518ARQ acts as the analog front-end and thermal supervisor - digitizing thermistor and shunt voltage signals via its 4-channel ADC, measuring internal die temperature, and generating precise reference voltages for charge controller DACs. Use Value: Enables adaptive charging algorithms that extend battery lifespan and prevent thermal runaway, leveraging the ADT7518ARQ's ±0.5°C internal temp accuracy and simultaneous 4-channel acquisition. |
Use Scenario: Monitoring ambient temperature, power supply rails, and laser diode bias currents on high-density telecom line cards subject to thermal derating. IC Role / Device Role / Timing Role: ADT7518ARQ serves as a multi-function sensor hub - reading board temperature (internal sensor), +12 V and –48 V rails (via resistive dividers into AIN1–AIN4), and controlling TEC driver bias (via VOUT-A/B) with I²C host coordination. Use Value: Consolidates five discrete components (temp sensor, quad ADC, dual DAC) into one QSOP - reducing layout area by >60% and improving thermal correlation between sensing and control loops. |
| PC System Health Monitor | Industrial Process Controller |
|
Use Scenario: Tracking CPU/GPU die temperature, VRM output voltage, fan speed feedback (via tachometer), and chassis ambient temp in desktop and server platforms. IC Role / Device Role / Timing Role: ADT7518ARQ functions as the system management controller's analog companion - converting thermal diodes (D+/D−), supply monitors (VDD, AIN1), and fan tach signals (AIN2) into digital values, while generating PWM reference voltages (VOUT-C/D) for fan speed control. Use Value: Delivers sub-degree thermal resolution and 10-bit ADC accuracy without external signal conditioning - meeting Intel IMVP and AMD SVI2 platform requirements for thermal throttling decisions. |
Use Scenario: Closed-loop control of heating elements in food processing ovens, where precise temperature setpoints and real-time thermal feedback are mandated by safety standards. IC Role / Device Role / Timing Role: ADT7518ARQ operates as the analog I/O engine - acquiring RTD or thermocouple signals (conditioned into 0–2.25 V range), measuring heater supply voltage, and driving SSR gate bias (via VOUT-A/B) with simultaneous update to avoid thermal overshoot. Use Value: Achieves <±1°C total system accuracy using internal temp sensor for cold-junction compensation and quad DACs for proportional heater drive - satisfying IEC 61508 SIL-2 functional safety prerequisites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal sensor interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7519ARQ | Direct successor with identical pinout and feature set; removes ADT7518ARQ's limitation where internal temp accuracy degrades when internal DAC reference is used. | Better suited for designs requiring simultaneous high-accuracy temperature sensing and DAC operation - e.g., medical thermal calibration systems. | Select ADT7519ARQ for new designs; it maintains full ±0.5°C temp accuracy regardless of DAC reference configuration. |
| MAX1270BCPP+ | 12-bit 8-channel ADC with internal reference only - lacks integrated temperature sensor, DACs, and I²C interface; requires external microcontroller for control. | Applicable where higher ADC resolution is prioritized over integration - e.g., precision data loggers needing >10-bit quantization but no analog output. | Choose MAX1270BCPP+ only if DAC functionality and on-chip temp sensing are unnecessary and 12-bit ADC resolution is mandatory. |
Compared with ADT7518ARQ, the ADT7519ARQ eliminates a critical accuracy trade-off in thermal-DAC coexistence scenarios, while the MAX1270BCPP+ trades integration for raw ADC resolution - making ADT7518ARQ optimal for cost-sensitive, space-constrained systems requiring balanced analog I/O and thermal intelligence.
Availability
ADT7518ARQ is available at Aetrix Electronics and suitable for smart battery chargers, telecom line cards, PC system health monitors, and industrial process controllers requiring stable component supply across extended temperature ranges (–40°C to +120°C) and long production lifecycles.
Supply support for ADT7518ARQ 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 decades of expertise in precision data conversion and sensor signal conditioning.
The ADT7518ARQ belongs to Analog Devices' ADT75xx family of integrated thermal management ICs, designed specifically to consolidate temperature sensing, analog input acquisition, and analog output control into single-chip solutions for embedded thermal-aware systems.
FAQ
What is the guaranteed temperature accuracy of the ADT7518ARQ over its full operating range?
The ADT7518ARQ guarantees ±2°C to ±5°C internal temperature accuracy across –40°C to +120°C, depending on supply voltage and averaging mode. At 0°C to +85°C with VDD = 3.3 V ±10%, its typical accuracy is ±0.5°C - verified under conditions where the internal reference is not used by the on-chip DAC. This specification is explicitly defined in Table 1 of the Rev. A datasheet.
Does the ADT7518ARQ support true simultaneous update of all four DAC outputs?
Yes, the ADT7518ARQ supports true simultaneous DAC output update via its dedicated LDAC pin (Pin 9) or software-controlled LDAC function. A falling edge on LDAC transfers data from all four input registers to their respective DAC registers atomically - ensuring zero inter-channel skew. This behavior is confirmed in the General Description and Pin Function Descriptions sections of the ADT7518ARQ datasheet.
Can the ADT7518ARQ measure external temperature using a transistor sensor?
Yes, the ADT7518ARQ supports external temperature measurement using a standard NPN or PNP bipolar transistor (e.g., 2N3906) connected across Pins 7 (D+) and 8 (D–). Its on-chip current sources and dedicated measurement circuitry deliver ±3°C accuracy from 0°C to +85°C - documented in the Thermal Characteristics section and Functional Block Diagram of the ADT7518ARQ datasheet.
What are the voltage ranges supported by the ADT7518ARQ's analog inputs and DAC outputs?
The ADT7518ARQ's four ADC channels accept 0 V to 2.25 V (or 0 V to VDD) single-ended inputs, while its four DAC outputs swing from 0 V to VREF - where VREF may be the internal 2.25 V reference or an external source up to VDD. Output settling time is 7 µs typical, and rail-to-rail amplifiers ensure full-scale drive capability into 4.7 kΩ loads.
Is the ADT7518ARQ pin-compatible with any newer Analog Devices parts?
Yes, the ADT7518ARQ is pin-compatible with the ADT7519ARQ, its direct successor. Both share identical 16-lead QSOP packaging, pin assignments, and register map - but the ADT7519ARQ removes the ADT7518ARQ's restriction on internal temperature accuracy when using the internal DAC reference. This upgrade path is explicitly recommended in the ADT7518ARQ datasheet's General Description.
ADT7518ARQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 120°C, External Sensor
- Accuracy:
- -
- Topology:
- ADC, Comparator, Multiplexer, Register Bank
- Output Type:
- I2C, MICROWIRE, QSPI, SPI
- Output Alarm:
- No
- Output Fan:
- No
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 120°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADT7518ARQ FAQ
1.How can I place an order for ADT7518ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7518ARQ 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 ADT7518ARQ reliable?
The price and inventory of ADT7518ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7518ARQ is usually 5 days.
3.What payment methods are accepted for ADT7518ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7518ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7518ARQ?
ADT7518ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7518ARQ 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 ADT7518ARQ?
For technical support, including ADT7518ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7518ARQ requirements.
6.How does Aetrix verify that ADT7518ARQ is sourced from the original manufacturer or authorized distributors?
All ADT7518ARQ 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 ADT7518ARQ meets industry standards.
7.What is the process for return or replacement of ADT7518ARQ?
All ADT7518ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADT7518ARQ, 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 ADT7518ARQ part is unused and in its original packaging.
Return procedure for ADT7518ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7518ARQ Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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