Analog Devices Inc. AD7466BRT-R2

Overview

AD7466BRT-R2 from Analog Devices is a 12-bit, micropower successive approximation ADC operating from 1.6 V to 3.6 V supply, delivering 200 kSPS throughput with 69 dB SINAD at 30 kHz input and 0.12 mW typical power at 1.6 V/100 kSPS. It features internal VDD-referenced conversion, SPI/QSPI/MICROWIRE-compatible serial interface, and no pipeline delay-used in ultra-low-power sensor signal digitization for portable medical devices.

For engineers reviewing the AD7466BRT-R2 datasheet, AD7466BRT-R2 pinout, AD7466BRT-R2 application, or AD7466BRT-R2 equivalent, key selection criteria include its 12-bit resolution with ±1.5 LSB INL, 6-lead SOT-23 package, 1.6 V minimum supply, 8 nA power-down current, and guaranteed no missing codes-critical for battery-powered precision acquisition where supply headroom and quiescent current are constrained.

Technical Context

The AD7466BRT-R2 implements a single-supply successive approximation architecture with track-and-hold amplifier supporting >3 MHz full-power bandwidth. Conversion is initiated by falling edge of CS, synchronized to SCLK, with 16-cycle conversion time (4.70 μs max at 3.4 MHz) and zero pipeline latency.

It uses VDD as internal reference, enabling 0 V to VDD analog input range and eliminating external reference components. Serial interface operates in SPI-compatible mode with MSB-first 16-bit frame (4 leading zeros + 12 data bits), and automatic power-down activates between conversions when CS remains high.

Key Specifications

Pinout & Package

AD7466BRT-R2 is housed in a 6-lead SOT-23 package (1.6 mm × 2.8 mm × 1.1 mm body, 0.95 mm pitch), optimized for space-constrained PCB layouts in wearable and implantable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822UID and MAX11100ETA+, AD7466BRT-R2 uniquely supports 1.6 V operation and VDD-referenced scaling-enabling direct integration with emerging low-voltage energy harvesters and single-cell battery systems where supply voltage varies from 1.6 V to 3.6 V across discharge cycles.

Availability

AD7466BRT-R2 is available at Aetrix Electronics and suitable for battery-powered medical instruments, remote data acquisition nodes, and isolated industrial transmitters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AD7466BRT-R2 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7466BRT-R2 belongs to Analog Devices' micropower SAR ADC family designed specifically for ultra-low-energy signal acquisition in portable, implantable, and energy-harvesting systems where supply voltage headroom and quiescent current are primary constraints.

FAQ

What is the minimum supply voltage supported by the AD7466BRT-R2?

The AD7466BRT-R2 operates down to 1.6 V, as specified in its absolute maximum ratings and electrical characteristics tables. At this voltage, it maintains 12-bit resolution, 200 kSPS throughput, and 0.12 mW typical power consumption at 100 kSPS-making it suitable for single-cell alkaline, NiMH, or LiFePO₄ battery systems across full discharge curves. The AD7466BRT-R2 datasheet confirms functionality and performance specifications are guaranteed from 1.6 V to 3.6 V.

Does the AD7466BRT-R2 require an external voltage reference?

No, the AD7466BRT-R2 uses its VDD supply as the internal reference, establishing a 0 V to VDD analog input range. This eliminates the need for external reference ICs, reducing BOM count, PCB area, and potential drift sources. The AD7466BRT-R2 achieves this via on-chip bandgap and buffer circuitry, with performance validated across the full 1.6–3.6 V supply range per the Rev. C datasheet.

What serial interface protocols does the AD7466BRT-R2 support?

The AD7466BRT-R2 supports SPI, QSPI, MICROWIRE, and generic DSP-compatible serial interfaces. Its SDATA output is three-state and synchronized to SCLK falling edges, with a 16-bit frame format (4 leading zeros followed by 12 MSB-first data bits). The AD7466BRT-R2 requires no mode pins or configuration registers-interface behavior is fixed and compatible with standard SPI master peripherals.

How does the AD7466BRT-R2 achieve ultra-low power consumption in power-down mode?

The AD7466BRT-R2 enters automatic power-down when CS remains high between conversions, reducing supply current to 8 nA typical (0.1 μA max). This state disables the internal track-and-hold amplifier, reference buffer, and digital logic while retaining register state. The AD7466BRT-R2 resumes full operation within 640 ns (at VDD ≥ 1.8 V) after CS assertion, enabling rapid wake-up for burst-mode acquisition.

Is the AD7466BRT-R2 pin-compatible with other members of the AD7466/AD7467/AD7468 family?

Yes, the AD7466BRT-R2 shares identical 6-lead SOT-23 pinout and package dimensions with AD7467BRT-R2 and AD7468BRT-R2. All three variants use the same CS, VDD, GND, VIN, SDATA, and SCLK connections, allowing hardware reuse across 12-bit, 10-bit, and 8-bit resolutions. However, firmware must accommodate differing data frame lengths (16-bit for AD7466BRT-R2 vs. 14-bit for AD7467BRT-R2).