Analog Devices Inc. AD7441BRTZ-R2

Overview

AD7441BRTZ-R2 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. It operates from a single 2.7 V to 5.25 V supply, achieves 1 MSPS throughput, delivers 61 dB SINAD at 100 kHz input, and consumes only 4 mW at 3 V - optimized for battery-powered data acquisition and portable instrumentation.

For engineers reviewing the AD7441BRTZ-R2 datasheet, AD7441BRTZ-R2 pinout, AD7441BRTZ-R2 application, or AD7441BRTZ-R2 equivalent, key selection criteria include its 10-bit resolution with ±0.5 LSB INL, pseudo-differential VIN+/VIN– architecture, SPI-compatible serial interface, 1 μA power-down current, and SOT-23 thermal performance (θJC = 91.99°C/W).

Technical Context

The AD7441BRTZ-R2 implements a true SAR architecture with no pipeline delay, using dual capacitive DACs and a differential track-and-hold amplifier capable of handling 3.5 MHz input signals. Its conversion is initiated by the falling edge of CS and clocked by SCLK, enabling precise sampling control and deterministic latency.

It supports flexible reference scaling (100 mV to VDD), accepts pseudo-differential inputs where VIN– establishes a dc offset reference for VIN+, and features straight binary output coding with four leading zeros followed by 10 data bits and two trailing zeros - all synchronized to the SCLK falling edge.

Key Specifications

Pinout & Package

AD7441BRTZ-R2 is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with exposed pad not internally connected. Thermal resistance θJC = 91.99°C/W supports operation up to +85°C ambient under typical PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7441BRMZ-REEL, AD7441BRTZ-R2 offers identical functionality in a smaller SOT-23 package with slightly higher thermal resistance - advantageous for miniaturized battery-powered devices. Versus ADS7822U, AD7441BRTZ-R2 provides 5× higher throughput, 1 μA shutdown, and wider supply range, at the cost of 2-bit resolution.

Availability

AD7441BRTZ-R2 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and portable instrumentation requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for AD7441BRTZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7441BRTZ-R2 belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-throughput data acquisition in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling rate supported by the AD7441BRTZ-R2?

The AD7441BRTZ-R2 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock (SCLK). Conversion time is fixed at 16 SCLK cycles (888 ns), and the device maintains this rate across its full 2.7 V to 5.25 V supply range while meeting all AC and DC specifications.

Does the AD7441BRTZ-R2 require an external reference voltage?

Yes, the AD7441BRTZ-R2 requires an external reference voltage applied to the VREF pin. It operates with reference voltages from 100 mV to VDD, and the specified performance is guaranteed at 2.5 V ±1%. A minimum 0.1 μF decoupling capacitor must be placed directly at the VREF pin to ensure stability and noise immunity.

What is the meaning of "pseudo-differential" input in the AD7441BRTZ-R2?

"Pseudo-differential" means the AD7441BRTZ-R2 accepts two analog inputs - VIN+ and VIN– - where VIN– is not a true differential complement but serves as a user-configurable dc reference point (e.g., grounded or biased) for VIN+. This configuration rejects common-mode noise on both lines while enabling single-ended sensor interfacing without a dedicated differential driver.

Can the AD7441BRTZ-R2 operate from a 3.3 V supply?

Yes, the AD7441BRTZ-R2 is fully specified for operation from 2.7 V to 5.25 V, including standard 3.3 V supplies. At 3.3 V, it delivers 4 mW maximum power dissipation at 1 MSPS, maintains 61 dB SINAD at 100 kHz, and retains all timing and accuracy specifications - making it ideal for modern low-voltage embedded systems.

What serial interface protocols is the AD7441BRTZ-R2 compatible with?

The AD7441BRTZ-R2 features an SPI-compatible serial interface that is also interoperable with QSPI, MICROWIRE, and DSP host controllers. It uses CS (active-low chip select), SCLK (serial clock), and SDATA (3-state serial data output), with data clocked out MSB-first on the falling edge of SCLK in a 16-bit frame format.