Analog Devices Inc. AD7476AAKS-500RL7

Overview

AD7476AAKS-500RL7 from Analog Devices is a 12-bit, single-supply, successive-approximation analog-to-digital converter (ADC) in a 6-lead SC70 package. It delivers 1 MSPS throughput at 2.35 V to 5.25 V supply, achieves 71 dB SNR at 100 kHz input, features no pipeline delay, and uses internal VDD-referenced conversion for 0 V to VDD analog input range-enabling high-fidelity signal digitization in space-constrained battery-powered systems.

For engineers reviewing the AD7476AAKS-500RL7 datasheet, AD7476AAKS-500RL7 pinout, AD7476AAKS-500RL7 application, or AD7476AAKS-500RL7 equivalent, this page provides verified technical context, real-world design meanings for key specs, validated SC70 pin functions, confirmed automotive-grade performance, and two rigorously cross-checked alternative parts with documented functional and application-level differences.

Technical Context

The AD7476AAKS-500RL7 implements a standard successive-approximation register (SAR) architecture with a track-and-hold amplifier capable of >13 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, and sampling is precisely controlled by that same edge-eliminating pipeline latency and enabling deterministic timing critical for closed-loop control.

It uses VDD as its reference source, directly tying analog input range to supply voltage (0 V to VDD), and interfaces via SPI/QSPI/MICROWIRE/DSP-compatible serial protocol with 16 SCLK cycles per conversion. Power management includes a standby mode drawing ≤1 µA, and dynamic power scales linearly with throughput via SCLK frequency adjustment.

Key Specifications

Pinout & Package

AD7476AAKS-500RL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm body, 0.65 mm pitch), optimized for ultra-compact PCB layouts and low parasitic capacitance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7476AAKS-500RL7, AD7476ARMZ offers identical electrical performance in a more serviceable package, while ADS7822U trades speed and integration for lower cost and external reference flexibility-neither is pin-compatible, and both require PCB layout changes.

Availability

AD7476AAKS-500RL7 is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, and industrial sensor transmitters requiring stable component supply, long-term lifecycle support, and automotive-qualified performance.

Supply support for AD7476AAKS-500RL7 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 global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial, and automotive markets since 1965.

The AD7476A family was designed to deliver 12-bit resolution and 1 MSPS speed in the smallest possible footprint-targeting space- and power-constrained applications where traditional SAR ADCs were too large or power-hungry.

FAQ

What is the maximum sampling rate supported by the AD7476AAKS-500RL7?

The AD7476AAKS-500RL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz serial clock (SCLK) and 16 SCLK cycles per conversion. At lower SCLK frequencies, throughput scales linearly-for example, 10 MHz SCLK yields 500 kSPS. The part guarantees full AC and DC specifications at 1 MSPS across its full operating temperature range.

Does the AD7476AAKS-500RL7 require an external voltage reference?

No, the AD7476AAKS-500RL7 uses an internal reference derived from VDD, resulting in an analog input range of 0 V to VDD. This eliminates the need for external reference components, reduces BOM count, and simplifies layout-though it means full-scale accuracy tracks supply variation (±1.5 LSB gain error over VDD range).

What is the purpose of the four leading zeros in the AD7476AAKS-500RL7 serial data stream?

The AD7476AAKS-500RL7 outputs four leading zeros followed by 12 data bits (MSB first) on SDATA. These zeros provide timing alignment and bus turnaround time, ensuring reliable capture by microcontrollers with fixed-width SPI frame registers-especially those expecting 16-bit words. They do not represent actual data bits.

Can the AD7476AAKS-500RL7 operate from a 2.0 V supply?

The AD7476AAKS-500RL7 is specified for 2.35 V to 5.25 V operation, but the datasheet notes functional operation down to 2.0 V with adjusted logic thresholds (VINL ≤ 0.35 V). However, DC accuracy (INL, offset, gain) and dynamic performance (SNR, SINAD) are not guaranteed below 2.35 V, and automotive-grade operation requires ≥2.35 V.

How does the AD7476AAKS-500RL7 handle power-down mode, and what is its wake-up time?

The AD7476AAKS-500RL7 enters full power-down mode when CS remains high and SCLK is inactive, drawing ≤1 µA (typically 50 nA). Wake-up is immediate: conversion begins on the next CS falling edge, with power-up time from full power-down specified at ≤1 µs-enabling burst-mode acquisition with minimal latency penalty.