Analog Devices Inc. AD7276ARMZ-REEL

Overview

AD7276ARMZ-REEL from Analog Devices is a 12-bit, 3 MSPS successive approximation analog-to-digital converter (ADC) in a 6-lead TSOT package, operating from 2.35 V to 3.6 V supply, delivering 70 dB SNR at 1 MHz input and 12.6 mW power consumption at 3 V/3 MSPS. It serves as a high-speed, low-power signal digitization front-end in portable instrumentation and sensor interface circuits.

For engineers reviewing the AD7276ARMZ-REEL datasheet, AD7276ARMZ-REEL pinout, AD7276ARMZ-REEL application, or AD7276ARMZ-REEL equivalent, key selection criteria include its 3 MSPS throughput with no pipeline delay, internal VDD-referenced 0–VDD input range, and SPI/QSPI/MICROWIRE-compatible serial interface for microcontroller/DSP integration.

Technical Context

The AD7276ARMZ-REEL implements a standard SAR architecture with track-and-hold amplifier supporting >55 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, with data output MSB-first on SDATA synchronized to SCLK falling edges.

It uses VDD as the internal reference, eliminating external reference components and enabling rail-to-rail analog input (0 V to VDD). Timing is fully controlled by CS and SCLK - no separate conversion clock is required, and acquisition time is guaranteed ≥60 ns.

Key Specifications

Pinout & Package

AD7276ARMZ-REEL is housed in a 6-lead TSOT (Thin Small Outline Transistor) package, 2.9 mm × 1.6 mm × 0.8 mm, with exposed pad for thermal enhancement. Pinout is validated per Analog Devices Rev. E datasheet Figure 8 and Table 7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7276ARMZ-REEL, AD7476ARMZ-REEL trades speed for improved low-frequency SNR and lower power at reduced throughput, while ADS7822U offers lower cost and 5 V compatibility at the expense of speed, integration, and modern low-voltage operation.

Availability

AD7276ARMZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interface, and motor control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7276ARMZ-REEL 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 AD7276ARMZ-REEL belongs to the AD727x family of high-speed, low-power SAR ADCs designed for space-constrained, battery-operated, and high-temperature embedded systems requiring fast, accurate signal digitization without pipeline latency.

FAQ

What is the maximum sampling rate supported by the AD7276ARMZ-REEL?

The AD7276ARMZ-REEL supports a maximum throughput rate of 3 MSPS under B-grade conditions with 48 MHz SCLK. This is achieved using a 14 SCLK-cycle serial interface, yielding a minimum conversion cycle time of 333 ns. At lower SCLK frequencies (e.g., 16 MHz for Y grade), the maximum rate drops to 1 MSPS. The part guarantees no pipeline delay, so each conversion completes deterministically after CS assertion.

Does the AD7276ARMZ-REEL require an external reference voltage?

No, the AD7276ARMZ-REEL uses an internal reference derived from VDD, establishing a 0 V to VDD analog input range. This eliminates the need for external reference ICs or resistor dividers, simplifying design and reducing component count. The reference tracking error is included in the total unadjusted error (±3.5 LSB max gain error), and performance remains specified across the full 2.35 V to 3.6 V VDD range.

How does the AD7276ARMZ-REEL interface with a microcontroller SPI peripheral?

The AD7276ARMZ-REEL is SPI-/QSPI-/MICROWIRE-/DSP-compatible: it uses CS (active-low chip select), SCLK (serial clock input), and SDATA (3-state serial data output). Data is clocked out MSB-first on the falling edge of SCLK. The AD7276ARMZ-REEL outputs two leading zeros, then 12 data bits, then two trailing zeros - requiring proper bit-shift alignment in firmware. No special SPI mode settings (e.g., CPOL/CPHA) are needed beyond standard Mode 0 (CPOL = 0, CPHA = 0).

What is the power consumption of the AD7276ARMZ-REEL in power-down mode?

In full power-down mode, the AD7276ARMZ-REEL draws 2 μA maximum (−40°C to +85°C), typically 0.1 μA. This ultra-low quiescent current enables rapid wake-up in duty-cycled systems. Partial power-down mode consumes 34 μA typical. Power-down is entered by holding CS high while SCLK is inactive; recovery time is ≤1 μs. Total power dissipation in normal operational mode is 12.6 mW typical at 3 V and 3 MSPS.

Is the AD7276ARMZ-REEL pin-compatible with other members of the AD727x family?

Yes - the AD7276ARMZ-REEL shares identical pinout and package (6-lead TSOT) with AD7277ARMZ-REEL and AD7278ARMZ-REEL. All three variants use the same VDD, GND, VIN, SCLK, SDATA, and CS connections. Firmware must be adapted to handle differing data lengths (12/10/8 bits), but PCB layout and signal routing remain unchanged across the family, enabling hardware reuse and design scalability.