Analog Devices Inc. AD7276BRM

Overview

AD7276BRM from Analog Devices is a 12-bit, 3 MSPS successive approximation analog-to-digital converter (ADC) optimized for high-speed, low-power data acquisition in space-constrained systems. It operates from a single 2.35 V to 3.6 V supply, consumes 12.6 mW at 3 MSPS with 3 V, delivers 70 dB SNR at 1 MHz input, and features no pipeline delay. It is used in portable instrumentation, motor control feedback loops, and high-bandwidth sensor interfaces where precision timing and minimal power are critical.

For engineers reviewing the AD7276BRM datasheet, AD7276BRM pinout, AD7276BRM application, or AD7276BRM equivalent, key selection considerations include its 6-lead TSOT package footprint, SPI/QSPI/MICROWIRE-compatible serial interface, internal VDD-referenced 0–VDD input range, and guaranteed no-missed-codes performance across −40°C to +125°C.

Technical Context

The AD7276BRM implements a standard SAR architecture with a track-and-hold amplifier supporting >55 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, and data is clocked out MSB-first on SDATA's falling SCLK edge - two leading zeros, 12 data bits, two trailing zeros - requiring exactly 14 SCLK cycles at up to 48 MHz.

It uses VDD as its reference source, eliminating external reference components and enabling rail-to-rail analog input (0 V to VDD). Power management includes full power-down mode (0.1 μA typical) and partial power-down, with conversion time fixed at 291 ns max under B-grade conditions.

Key Specifications

Pinout & Package

AD7276BRM is housed in a 6-lead TSOT (Thin Small Outline Transistor) package, measuring 2.9 mm × 1.6 mm × 0.8 mm, with exposed pad for thermal enhancement. Pin 1 is VDD; pin 2 is GND; pin 3 is single-ended analog input (VIN); pin 4 is serial clock (SCLK); pin 5 is serial data output (SDATA); pin 6 is active-low chip select (CS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7276BRM, AD7476ARMZ trades speed and package size for lower cost and simpler supply sequencing, while ADS7883IDBVR matches throughput and footprint but sacrifices SNR and temperature robustness - making AD7276BRM the optimal choice for demanding industrial or automotive signal chains.

Availability

AD7276BRM is available at Aetrix Electronics and suitable for portable instrumentation, motor control feedback systems, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7276BRM 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.

The AD7276BRM belongs to Analog Devices' precision high-speed SAR ADC product line, engineered for applications demanding deterministic timing, low power, and wide temperature operation without external references.

FAQ

What is the maximum sampling rate supported by the AD7276BRM?

The AD7276BRM supports a maximum throughput rate of 3 MSPS under B-grade conditions with a 48 MHz SCLK. This is achieved using a fixed 14-SCLK conversion cycle, yielding a minimum conversion period of 333 ns. At lower SCLK frequencies or Y-grade operation, the rate drops to 1 MSPS - always confirmed in the device's timing specifications table.

Does the AD7276BRM require an external voltage reference?

No, the AD7276BRM uses an internal reference derived from VDD, enabling a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference ICs or resistor dividers, reducing BOM count and layout complexity - a key advantage over many competing 12-bit SAR ADCs like the AD7476 series.

How does the AD7276BRM handle power management in low-duty-cycle systems?

The AD7276BRM offers two power-down modes: partial (34 μA typical) and full (0.1 μA typical). Full power-down retains no state and requires <1 μs wake-up time, making it ideal for burst-mode acquisition in battery-powered systems. The device resumes conversion immediately after CS assertion, with no calibration overhead.

What serial interface protocols is the AD7276BRM compatible with?

The AD7276BRM supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces. Its SDATA output is three-state, CS initiates conversion and frames data, and data is clocked out MSB-first on the falling edge of SCLK - matching standard microcontroller SPI master timing without mode or polarity configuration.

Is the AD7276BRM pin-compatible with other members of the AD727x family?

Yes - the AD7276BRM shares identical pinout and package (6-lead TSOT) with AD7277BRM and AD7278BRM. All three differ only in resolution (12/10/8-bit) and corresponding timing (14/12/10 SCLK cycles), allowing hardware reuse across performance tiers with only firmware and timing adjustments required.