Analog Devices Inc. AD7441BRM

Overview

AD7441BRM from Analog Devices is a 10-bit, pseudo-differential, successive approximation register (SAR) analog-to-digital converter (ADC) in an 8-lead SOT-23 package, operating from 2.7 V to 5.25 V with 1 MSPS throughput, 61 dB SINAD at 100 kHz, and 4 mW power dissipation at 3 V - used in battery-powered data acquisition systems requiring compact size and low quiescent current.

For engineers reviewing the AD7441BRM datasheet, AD7441BRM pinout, AD7441BRM application, or AD7441BRM equivalent, this page delivers verified technical context, real-world timing behavior, true DC accuracy specs (±0.5 LSB INL), confirmed serial interface compatibility (SPI/QSPI/MICROWIRE/DSP), and validated alternative part selection guidance - all grounded in Rev. D datasheet specifications.

Technical Context

The AD7441BRM implements a SAR architecture with no pipeline delay, using dual capacitive DACs and a differential track-and-hold amplifier that supports up to 3.5 MHz input slew rates. Its conversion is initiated by the falling edge of CS and clocked by SCLK, enabling precise sampling control without latency.

It features flexible power management via serial clock speed scaling and a full power-down mode drawing ≤1 μA. The pseudo-differential input uses VIN+ referenced to a small DC bias on VIN–, with external VREF ranging from 100 mV to VDD - decoupled by ≥0.1 μF capacitor - and straight binary output coding.

Key Specifications

Pinout & Package

AD7441BRM is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with 0.65 mm lead pitch, 2.9 mm × 1.6 mm body size, and exposed pad not electrically connected. Pin 1 is VREF (top-left when notch/identifier faces up); pin numbering follows standard SOT-23 counterclockwise orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with AD7441BRM, AD7451BRM offers higher resolution and dynamic performance at increased power and cost, while ADS7822U trades speed and package size for vendor-specific toolchain support - making AD7441BRM optimal for 1 MSPS, sub-4 mW, SOT-23-constrained designs.

Availability

AD7441BRM is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and portable instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AD7441BRM 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 AD7441BRM belongs to Analog Devices' precision SAR ADC product line, designed specifically for space- and power-constrained data acquisition in portable, industrial, and medical instrumentation.

FAQ

What is the maximum sampling rate supported by the AD7441BRM?

The AD7441BRM supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock (SCLK). At this rate, conversion time is fixed at 16 SCLK cycles (888 ns), and the device maintains specified DC accuracy (±0.5 LSB INL) and AC performance (61 dB SINAD at 100 kHz). Lower SCLK frequencies reduce throughput linearly and proportionally decrease power consumption.

Does the AD7441BRM require an external reference voltage?

Yes, the AD7441BRM requires an external reference voltage applied to the VREF pin. It operates with VREF ranging from 100 mV to VDD (2.7 V–5.25 V), and the datasheet specifies 2.5 V as the nominal reference. A minimum 0.1 μF decoupling capacitor must be placed between VREF and GND to ensure stability and noise immunity during conversion.

How does the pseudo-differential input of the AD7441BRM function in practice?

The AD7441BRM's pseudo-differential input uses VIN+ as the signal path and VIN− as a user-biased reference point (typically 0.1–0.4 V for 2.7–3.6 V supplies). This configuration rejects common-mode noise while avoiding the complexity of fully differential drivers. The full-scale input span equals VREF, and VIN− must remain within absolute limits (−0.1 V to +1.5 V) relative to GND to prevent damage or distortion.

What serial interface protocols is the AD7441BRM compatible with?

The AD7441BRM features a SPI-compatible serial interface that also supports QSPI, MICROWIRE, and generic DSP host controllers. It uses CS (active-low), SCLK, and SDATA (3-wire) with MSB-first, straight binary output format. Data is clocked out on the falling edge of SCLK, and the timing adheres to standard SPI Mode 0 (CPOL = 0, CPHA = 0) with t₄ = 40 ns data access time.

Can the AD7441BRM operate from a 3.3 V supply, and what is its typical power consumption at that voltage?

Yes, the AD7441BRM is fully specified for operation from 2.7 V to 5.25 V, including standard 3.3 V rails. At VDD = 3 V and 1 MSPS throughput, its maximum power dissipation is 4 mW, with typical IDD in normal operational mode being 1.45 mA. In power-down mode, it draws ≤1 μA - making it suitable for intermittent-sampling applications in 3.3 V battery-powered systems.