Analog Devices Inc. AD7441BRMZ

Overview

AD7441BRMZ 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 AD7441BRMZ datasheet, AD7441BRMZ pinout, AD7441BRMZ application, or AD7441BRMZ equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support tailored for portable instrumentation and embedded sensor interfaces.

Technical Context

The AD7441BRMZ implements a true SAR architecture with no pipeline delay, using dual capacitive DACs and a differential track-and-hold amplifier optimized for pseudo-differential input operation where VIN– establishes a dc reference point for VIN+. It supports SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with CS-controlled sampling initiation on the falling edge.

Conversion timing is fully synchronized to the external SCLK (up to 18 MHz), requiring exactly 16 clock cycles per conversion; acquisition time is 250 ns for sine-wave inputs and 290 ns for full-scale step inputs. The device accepts an externally applied reference voltage (100 mV to VDD) with 2.5 V nominal, and enters full power-down mode drawing ≤1 μA when CS remains high between conversions.

Key Specifications

Pinout & Package

AD7441BRMZ is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with lead pitch of 0.65 mm and body dimensions 2.9 mm × 1.6 mm × 1.1 mm. Pin 1 is marked by a dot; orientation follows standard SOT-23 top-view labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7441BRMZ, AD7451BRMZ offers two additional bits and 9 dB better SINAD but doubles power at 5 V; ADS7822U trades speed and package size for lower unit cost and simpler supply rail, making it viable only in non-size-constrained, sub-1-MSPS designs.

Availability

AD7441BRMZ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and handheld test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7441BRMZ 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, with design and manufacturing operations worldwide.

The AD7441/AD7451 product line was engineered for space- and power-constrained data acquisition systems demanding high-speed, low-noise, single-supply ADC functionality in miniature packages - specifically targeting portable and battery-operated instrumentation.

FAQ

What is the maximum sampling rate supported by the AD7441BRMZ?

The AD7441BRMZ supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock (SCLK) and exactly 16 SCLK cycles per conversion. This corresponds to a minimum conversion time of 888 ns. At lower SCLK frequencies, throughput scales linearly - e.g., 10 MHz SCLK yields ~625 ksps - enabling dynamic power optimization in variable-rate applications.

Does the AD7441BRMZ require an external reference voltage?

Yes, the AD7441BRMZ requires an external reference voltage applied to the VREF pin. It operates with VREF ranging from 100 mV to VDD, with 2.5 V specified for full performance. The reference must be low-noise and decoupled with at least a 0.1 µF ceramic capacitor to GND. No internal reference is provided, and VREF directly sets the full-scale input range (VIN+ − VIN– = VREF).

What does "pseudo-differential input" mean for the AD7441BRMZ?

"Pseudo-differential input" means the AD7441BRMZ accepts a differential voltage across VIN+ and VIN–, but VIN– is not a true high-impedance complementary input. Instead, VIN– serves as a dc reference point (often grounded or biased) for VIN+, enabling robust single-ended signal digitization while rejecting common-mode noise. This architecture simplifies sensor interfacing without requiring matched differential drivers.

Can the AD7441BRMZ operate from a 3.3 V supply?

Yes, the AD7441BRMZ is fully specified for operation from 2.7 V to 5.25 V, including standard 3.3 V rails. At 3.3 V, it delivers 4 mW max power at 1 MSPS, 61 dB SINAD at 100 kHz, and maintains all timing and accuracy specifications across −40°C to +85°C. Logic levels remain compatible: VINH ≥ 2.4 V and VINL ≤ 0.8 V are satisfied with 3.3 V CMOS outputs.

How is sampling triggered on the AD7441BRMZ?

Sampling on the AD7441BRMZ is triggered by the falling edge of the CS (chip select) signal. When CS goes low, the internal track-and-hold amplifier begins sampling the analog input; conversion starts immediately and completes in 16 SCLK cycles. The sampled value is held constant during conversion, ensuring accurate capture of fast transients without aperture uncertainty beyond the specified 5 ps jitter.