Analog Devices Inc. AD7466BRM

Overview

AD7466BRM from Analog Devices is a 12-bit, successive approximation analog-to-digital converter (ADC) operating from a single 1.6 V to 3.6 V supply, delivering 200 kSPS throughput with 0.9 mW max power dissipation at 3 V and 100 kSPS. It features no pipeline delay, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and internal VDD-referenced conversion enabling 0 V to VDD input range - ideal for precision sensing in ultra-low-power battery systems.

For engineers reviewing the AD7466BRM datasheet, AD7466BRM pinout, AD7466BRM application, or AD7466BRM equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL, 69 dB min SINAD at 30 kHz, 4.70 μs max conversion time, 6-lead SOT-23 package, and guaranteed no missed codes - all critical for medical instrumentation and isolated data acquisition where accuracy, size, and micropower operation intersect.

Technical Context

The AD7466BRM implements a standard successive approximation register (SAR) architecture with a track-and-hold amplifier supporting >3 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, and sampling occurs simultaneously, eliminating pipeline latency.

Its reference is derived directly from VDD, fixing the analog input range to 0 V to VDD and simplifying system-level voltage scaling. Serial communication uses a 16-cycle SCLK-driven protocol (MSB-first), with four leading zeros followed by 12-bit data on SDATA, compatible with common microcontroller SPI peripherals without level-shifting.

Key Specifications

Pinout & Package

AD7466BRM is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), footprint-compatible with space-constrained PCB layouts and reflow-solderable per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822IDR and MAX11100EUA+, AD7466BRM uniquely combines 1.6 V operation, 6-lead SOT-23 packaging, and guaranteed no-missed-codes 12-bit performance - making it the sole option for space- and energy-constrained designs demanding full-scale accuracy below 2 V.

Availability

AD7466BRM is available at Aetrix Electronics and suitable for portable ECG monitors, wireless sensor nodes, isolated industrial sensors, and implantable medical telemetry requiring stable component supply and long-term production continuity.

Supply support for AD7466BRM 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7466BRM belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for battery-powered instrumentation and remote sensing where sub-1 mW operation, small footprint, and guaranteed linearity are non-negotiable.

FAQ

What is the minimum supply voltage required for reliable operation of the AD7466BRM?

The AD7466BRM operates reliably from 1.6 V to 3.6 V. At 1.6 V, it maintains 12-bit resolution, ±1.5 LSB INL, and 70.5 dB typical SNR at 30 kHz. Below 1.6 V, functionality is not guaranteed per datasheet specifications, and startup behavior may be inconsistent. The 1.6 V minimum enables direct interface with single-cell LiFePO₄ or alkaline batteries without regulation - a key enabler for ultra-low-power AD7466BRM deployments.

Does the AD7466BRM require an external reference voltage?

No, the AD7466BRM uses an internal reference derived from VDD, establishing a 0 V to VDD analog input range. This eliminates the need for external reference ICs, decoupling capacitors, and associated layout area. Because the reference tracks VDD, measurements remain ratiometric - preserving accuracy even with supply droop or variation - a critical advantage in battery-powered AD7466BRM applications where supply voltage fluctuates over discharge cycles.

How does the AD7466BRM achieve its 8 nA typical power-down current?

The AD7466BRM achieves 8 nA typical power-down current by fully disabling its internal track-and-hold amplifier, reference buffer, and digital logic upon completion of conversion, leaving only leakage paths active. This state is entered automatically after each serial data frame ends, requiring no software command. In this mode, the AD7466BRM draws less than 0.3 μW at 3 V - enabling multi-year operation in intermittent-sampling systems. Recovery to full operation takes ≤640 ns, ensuring rapid responsiveness.

What is the significance of "guaranteed no missed codes" for the AD7466BRM?

"Guaranteed no missed codes" means the AD7466BRM's transfer function produces at least one output code for every possible analog input value across its full 0 V to VDD range - ensuring strict monotonicity and absence of code gaps. This is verified to 12 bits per datasheet. For the AD7466BRM, it eliminates ambiguity in position sensing, motor commutation, and safety-critical feedback loops where missing a code could cause undetected saturation or control instability.

Can the AD7466BRM interface directly with a 1.8 V microcontroller SPI port?

Yes, the AD7466BRM supports 1.6 V to 3.6 V operation and has logic thresholds defined as 0.7 × VDD (high) and 0.3 × VDD (low) for VDD ≥ 1.8 V. At VDD = 1.8 V, VINH = 1.26 V min and VINL = 0.54 V max - fully compatible with 1.8 V GPIO levels. Its SDATA output swings from 0.2 V to VDD − 0.2 V, meeting 1.8 V MCU input requirements. No level-shifting is needed, simplifying integration and reducing bill-of-materials for AD7466BRM-based designs.