Analog Devices Inc. ADT7518ARQZ-REEL7

Overview

ADT7518ARQZ-REEL7 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 is used in smart battery chargers and process control systems where multi-function analog monitoring and programmable output are required.

For engineers reviewing the ADT7518ARQZ-REEL7 datasheet, ADT7518ARQZ-REEL7 pinout, ADT7518ARQZ-REEL7 application, or ADT7518ARQZ-REEL7 equivalent, key selection considerations include its dual-interface compatibility, simultaneous DAC update via LDAC, internal 2.25 V reference option, rail-to-rail output buffers, and guaranteed monotonicity across all DAC codes - critical for closed-loop calibration and sensor biasing.

Technical Context

The ADT7518ARQZ-REEL7 integrates three independent data conversion subsystems: a bandgap-based 10-bit 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 independent string DACs with double-buffered registers and software/hardware LDAC control. All subsystems share a common power domain and serial interface controller.

Its dual-mode serial interface supports full SPI/QSPI/MICROWIRE/DSP compatibility (4-wire) and SMBus/I²C (2-wire) with PEC support; the ADD pin selects one of three I²C addresses (1001000/1001010/1001011). Power-down mode reduces current to 1 µA, and power-on reset forces all DAC outputs to 0 V until first valid write.

Key Specifications

Pinout & Package

ADT7518ARQZ-REEL7 is housed in a 16-lead QSOP (Quarter-Size Outline Package) with 0.65 mm lead pitch and exposed pad for thermal performance. Pin functions are validated per Analog Devices Rev. A datasheet Figure 7 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixed-function analog monitoring and control applications.

Compared with ADT7518ARQZ-REEL7, ADT7519ARQZ-REEL7 removes a critical design constraint on reference sharing, while MAX1139EEE+ trades integration for higher ADC resolution - making ADT7518ARQZ-REEL7 optimal for cost-sensitive, space-constrained systems needing balanced mixed-signal functionality.

Availability

ADT7518ARQZ-REEL7 is available at Aetrix Electronics and suitable for smart battery chargers, industrial process monitoring, and PC system health management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADT7518ARQZ-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 decades of expertise in precision data conversion and sensor signal conditioning.

The ADT7518ARQZ-REEL7 belongs to Analog Devices' precision temperature and analog front-end product line, designed specifically for embedded systems requiring consolidated thermal monitoring, analog input acquisition, and programmable analog output in minimal footprint.

FAQ

What is the maximum sampling rate for the 4-channel ADC in ADT7518ARQZ-REEL7?

The ADT7518ARQZ-REEL7 supports Fast ADC mode with a minimum conversion time of 44.5 µs per channel (averaging off), enabling up to ~22.5 kSPS aggregate throughput across all four channels in round-robin sequencing. Slow ADC mode requires 712 µs per channel, limiting aggregate rate to ~1.4 kSPS. Actual update rate depends on interface speed and configuration register settings.

Does ADT7518ARQZ-REEL7 support simultaneous sampling of all four ADC channels?

No, ADT7518ARQZ-REEL7 does not support true simultaneous sampling. Its 4-channel ADC operates in sequential (round-robin) mode, measuring one channel at a time. The conversion sequence includes VDD, internal temperature, external temperature (D+/D−), AIN3, and AIN4 - with configurable channel selection via Control Configuration registers.

Can the internal 2.25 V reference be used for both the ADC and DAC simultaneously in ADT7518ARQZ-REEL7?

No - the ADT7518ARQZ-REEL7 datasheet explicitly states that internal temperature accuracy specifications are only valid when the internal reference is *not* used by the on-chip DAC. Using the internal reference for DAC operation degrades temperature sensor accuracy. For designs requiring both functions with full spec compliance, Analog Devices recommends ADT7519ARQZ-REEL7 instead.

What is the purpose of the LDAC pin on ADT7518ARQZ-REEL7?

The LDAC pin on ADT7518ARQZ-REEL7 is an active-low hardware control that transfers data from input registers to DAC registers, enabling synchronous updating of all four DAC outputs. When asserted, it forces immediate latching of pending DAC codes - critical for coordinated analog output changes in closed-loop systems. It can be disabled via Control Configuration 3 register to repurpose Pin 9 as AIN3.

Is ADT7518ARQZ-REEL7 pin-compatible with any newer Analog Devices parts?

ADT7518ARQZ-REEL7 is pin-compatible with ADT7519ARQZ-REEL7 - both use identical 16-lead QSOP packaging and share identical pin functions, electrical characteristics, and register maps. This allows drop-in replacement in existing designs to resolve the internal reference/temperature accuracy limitation without PCB revision.