Analog Devices Inc. AD7476ABRMZ

Overview

AD7476ABRMZ from Analog Devices is a 12-bit, single-supply, successive-approximation analog-to-digital converter (ADC) in a 6-lead SC70 package. It operates from 2.35 V to 5.25 V, achieves 1 MSPS throughput, delivers 71 dB SNR at 100 kHz input, and features SPI/QSPI/MICROWIRE/DSP-compatible serial interface with no pipeline delay-used for high-speed data acquisition in portable instrumentation.

For engineers reviewing the AD7476ABRMZ datasheet, AD7476ABRMZ pinout, AD7476ABRMZ application, or AD7476ABRMZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The AD7476ABRMZ implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold, sampling on the falling edge of CS and initiating conversion simultaneously. Its internal reference is derived from VDD, enabling a full-scale analog input range of 0 V to VDD without external reference components.

Conversion timing is fully controlled by the external SCLK: 16 clock cycles are required per conversion, with tCONVERT ≤ 800 ns at 20 MHz SCLK. The device supports flexible power management via a dedicated CS-controlled standby mode drawing ≤1 µA, and exhibits wide input bandwidth (13.5 MHz full-power bandwidth at –3 dB).

Key Specifications

Pinout & Package

AD7476ABRMZ is housed in a 6-lead SC70 package (JEDEC MO-203AA), measuring 2.0 mm × 1.25 mm × 0.9 mm, optimized for space-constrained portable designs. Thermal resistance θJA = 340.2°C/W reflects its compact die attach and minimal copper pad area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7476ABRMZ, AD7476ARMZ offers identical electrical performance and form factor with differentiated surface finish, while ADS7822U trades speed, supply flexibility, and dynamic accuracy for lower unit cost in less demanding signal chains.

Availability

AD7476ABRMZ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and optical sensor interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for AD7476ABRMZ 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 R&D and manufacturing operations worldwide.

The AD7476A series belongs to Analog Devices' precision SAR ADC product line, designed specifically for space- and power-constrained applications demanding high speed, low noise, and single-supply simplicity in portable and embedded systems.

FAQ

What is the maximum sampling rate supported by the AD7476ABRMZ?

The AD7476ABRMZ supports a maximum throughput rate of 1 MSPS, achieved when the serial clock (SCLK) operates at 20 MHz and the conversion is completed in 16 SCLK cycles (≤800 ns). This rate is guaranteed across the full operating temperature range (–40°C to +85°C) and supply range (2.35 V to 5.25 V). At lower SCLK frequencies, throughput scales linearly-for example, 10 MHz SCLK yields ~500 kSPS.

Does the AD7476ABRMZ require an external voltage reference?

No, the AD7476ABRMZ does not require an external voltage reference. It uses an internal reference derived from the VDD supply, resulting in a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference ICs or precision resistive dividers, reducing system cost, board area, and design complexity-especially beneficial in battery-powered and space-constrained applications.

What is the purpose of the four leading zeros in the AD7476ABRMZ serial data stream?

The AD7476ABRMZ outputs four leading zeros followed by the 12-bit conversion result (MSB first) on the SDATA line. These leading zeros provide consistent framing across the AD7476A/AD7477A/AD7478A family-ensuring software compatibility when multiple resolutions share the same interface. They also allow synchronous alignment of data words in systems using fixed-width SPI receive buffers or DMA controllers.

Can the AD7476ABRMZ operate from a 2.0 V supply?

The AD7476ABRMZ is specified to operate from 2.35 V to 5.25 V. However, Analog Devices characterizes functionality down to 2.0 V under limited conditions: digital inputs must meet adjusted thresholds (VINH ≥ 1.8 V, VINL ≤ 0.35 V), and DC accuracy specs are not guaranteed below 2.35 V. For production designs, operation below 2.35 V is not recommended unless validated per application requirements and environmental conditions.

How does the AD7476ABRMZ enter and exit standby mode?

The AD7476ABRMZ enters standby mode automatically when CS remains high and no SCLK activity occurs; it draws ≤1 µA typical (50 nA typ) in this state. To exit standby, assert CS low-this triggers sampling on the falling edge and initiates conversion. No additional command or delay is required, enabling sub-microsecond wake-up for burst-mode acquisition in energy-harvesting or duty-cycled systems.