Analog Devices Inc. AD7274BRMZ

Overview

AD7274BRMZ from Analog Devices is a 12-bit, 3 MSPS successive approximation ADC in an 8-lead TSOT package, operating from a single 2.35 V to 3.6 V supply. It delivers 69.5 dB SNR at 1 MHz input, supports external reference (1.4 V to VDD), and features no pipeline delay-enabling precise timing-critical sampling in high-speed sensor interfaces and industrial data acquisition systems.

For engineers reviewing the AD7274BRMZ datasheet, AD7274BRMZ pinout, AD7274BRMZ application, or AD7274BRMZ equivalent, this page provides verified technical context, real-world performance boundaries (e.g., 55 MHz full-power bandwidth, ±1 LSB INL), power-down mode behavior (0.1 μA typ), and validated alternative options for signal chain design continuity.

Technical Context

The AD7274BRMZ implements a charge redistribution DAC-based successive approximation architecture with on-chip track-and-hold, enabling accurate sampling of analog inputs up to 55 MHz (−3 dB) without pipeline latency. Conversion is initiated by the falling edge of CS and clocked by SCLK, requiring exactly 14 cycles at 48 MHz for full 12-bit output.

It uses separate AGND and DGND pins with strict ≤0.3 V potential difference requirement, accepts external VREF from 1.4 V to VDD, and supports SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with MSB-first 12-bit data format preceded by two leading zeros and followed by two trailing zeros.

Key Specifications

Pinout & Package

AD7274BRMZ is housed in an 8-lead TSOT (Thin Small Outline Transistor) package, 3 mm × 3 mm × 0.8 mm body, exposed pad, RoHS-compliant. Pin 1 marked via laser scribe; recommended PCB footprint per Analog Devices MS-012-AB standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with AD7274BCPZ-RL7, AD7274BRMZ offers identical electrical performance in a lower-cost TSOT package with simpler assembly, while ADS8325IDRCT trades speed for resolution and eliminates external reference components-making it suitable only for static or slowly varying signals.

Availability

AD7274BRMZ is available at Aetrix Electronics and suitable for motor control feedback, portable medical instrumentation, industrial process monitoring, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7274BRMZ 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 worldwide.

The AD7274BRMZ belongs to Analog Devices' high-speed SAR ADC product line, engineered for applications demanding precise, low-latency digitization in space-constrained, thermally aggressive environments-especially industrial automation and portable diagnostics.

FAQ

What is the maximum sampling frequency supported by the AD7274BRMZ?

The AD7274BRMZ supports a maximum throughput rate of 3 MSPS, achieved with a 48 MHz SCLK and 14-cycle serial interface timing. This is guaranteed across the full −40°C to +125°C operating temperature range and 2.35 V to 3.6 V supply voltage. At lower SCLK frequencies (down to 500 kHz), the device maintains functional operation but reduces effective sampling rate proportionally.

Does the AD7274BRMZ require an external voltage reference?

Yes, the AD7274BRMZ requires an external voltage reference applied to the VREF pin. The reference voltage must be between 1.4 V and VDD, and a 10 μF ceramic capacitor is mandatory between VREF and AGND for stability and noise rejection. No internal reference is provided, enabling flexible full-scale range selection and improved system-level accuracy through precision external references.

How does the power-down mode operate on the AD7274BRMZ?

The AD7274BRMZ enters full power-down mode when CS remains high for more than 100 ns after the end of a conversion cycle, reducing IDD to 0.1 μA typical. In this state, the track-and-hold amplifier and core logic are disabled, but the device retains its configuration and wakes instantly upon next CS assertion. Partial power-down (34 μA) is also available for reduced idle current while retaining faster wake-up readiness.

What is the significance of the "no pipeline delay" specification for the AD7274BRMZ?

No pipeline delay means the AD7274BRMZ completes conversion and makes data available within a fixed, deterministic number of clock cycles (14 SCLK) after CS assertion-without intermediate staging registers. This eliminates output latency uncertainty, enabling precise synchronization in time-critical applications like motor commutation, burst-mode sampling, and real-time closed-loop control where sample-to-action timing must be tightly bounded.

Can the AD7274BRMZ interface directly with an FPGA using SPI protocol?

Yes, the AD7274BRMZ is fully SPI-compatible: it accepts standard SPI clock polarity (CPOL = 0) and phase (CPHA = 0), with data sampled on the falling edge of SCLK and output on the same edge. Its CS-controlled framing, MSB-first 12-bit data format (with two leading/trailing zeros), and three-state SDATA output allow seamless integration with FPGA GPIO or dedicated SPI peripherals without level-shifting or protocol translation.