Analog Devices Inc. AD7476ARTZ-REEL7

Overview

AD7476ARTZ-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.35 V to 5.25 V supply, delivering 70 dB SNR at 100 kHz input and consuming only 3.6 mW at 3 V. It features no pipeline delay, SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface, and internal VDD-referenced conversion for 0 V to VDD analog input range-ideal for portable medical sensors and battery-powered data acquisition.

For engineers reviewing the AD7476ARTZ-REEL7 datasheet, AD7476ARTZ-REEL7 pinout, AD7476ARTZ-REEL7 application, or AD7476ARTZ-REEL7 equivalent, key selection criteria include guaranteed no missing codes to 12 bits, ±1.5 LSB INL (max), 1 μA standby current, 6.5 MHz full-power bandwidth, and compatibility with microprocessor/DSP serial interfaces requiring minimal board space and low quiescent power.

Technical Context

The AD7476ARTZ-REEL7 implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its reference is derived directly from VDD, eliminating external reference components while enabling rail-to-rail input range.

Timing is fully controlled by CS and SCLK: conversion initiates at CS fall, data is clocked out MSB-first on SCLK falling edges, and SDATA enters high-impedance state within 20 ns after SCLK fall (A version). No pipeline latency ensures deterministic timing for real-time control loops.

Key Specifications

Pinout & Package

AD7476ARTZ-REEL7 is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and thermal resistance θ_JA = 230°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822UID and MAX1116EUT+T, AD7476ARTZ-REEL7 uniquely combines 12-bit resolution, 1 MSPS throughput, VDD-referenced operation, and sub-4 mW power in a 6-lead SOT-23-making it optimal for miniaturized, battery-operated systems where board area, supply flexibility, and self-contained accuracy are critical.

Availability

AD7476ARTZ-REEL7 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial field transmitters, and optical sensor interfaces requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for AD7476ARTZ-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 design centers and manufacturing worldwide.

The AD7476ARTZ-REEL7 belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for space- and energy-constrained applications demanding high resolution, fast throughput, and minimal external components in ultra-small packages.

FAQ

What is the maximum sampling rate supported by the AD7476ARTZ-REEL7?

The AD7476ARTZ-REEL7 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V, fSCLK = 20 MHz, and TA = −40°C to +85°C. This is achieved with a fixed 16-clock-cycle conversion time, meaning SCLK must run at ≥16 MHz to sustain 1 MSPS. The AD7476ARTZ-REEL7 datasheet confirms this value in Table 1 under "Throughput Rate" for the A version.

Does the AD7476ARTZ-REEL7 require an external voltage reference?

No, the AD7476ARTZ-REEL7 uses an internal reference derived from VDD, establishing a full-scale input range of 0 V to VDD. This eliminates the need for external reference ICs or precision resistors, simplifying design and reducing bill-of-materials cost. The AD7476ARTZ-REEL7 specification sheet explicitly states "Reference Derived from the Power Supply" in Product Highlights and confirms "Analog Input Voltage Ranges: 0 to VDD" in Table 1.

What is the guaranteed integral nonlinearity (INL) specification for the AD7476ARTZ-REEL7?

The AD7476ARTZ-REEL7 has a maximum integral nonlinearity of ±1.5 LSB over temperature (−40°C to +85°C) and supply (2.7 V to 5.25 V), as specified in Table 1 of the Rev. F datasheet under "DC ACCURACY." This value applies to the A version and ensures monotonic behavior and no missing codes across the full 12-bit range.

How does the AD7476ARTZ-REEL7 enter and exit power-down mode?

The AD7476ARTZ-REEL7 enters full power-down mode automatically when SCLK is held inactive and CS remains high; current drops to ≤1 μA. It exits power-down on the first falling edge of CS, with a typical power-up time of 1 μs (tPOWER-UP in Table 4). No command sequence or register write is needed-the AD7476ARTZ-REEL7's power state is fully managed by digital input timing.

Is the AD7476ARTZ-REEL7 compatible with standard SPI interfaces?

Yes, the AD7476ARTZ-REEL7 is SPI-, QSPI-, MICROWIRE-, and DSP-compatible. It uses a 3-wire serial interface (SCLK, CS, SDATA) with data clocked out MSB-first on the falling edge of SCLK. The AD7476ARTZ-REEL7 requires no configuration registers or mode pins-its timing aligns with standard SPI Mode 0 (CPOL = 0, CPHA = 0) when CS is used as frame sync.