Analog Devices Inc. ADA4841-1YRJZ-R7

Overview

ADA4841-1YRJZ-R7 from Analog Devices is a single-channel, rail-to-rail output, voltage-feedback operational amplifier optimized for low-noise, low-power precision signal conditioning. It delivers 2.1 nV/√Hz input voltage noise, −105 dBc harmonic distortion at 100 kHz (2 V_p-p), and 12 V/µs slew rate while consuming only 1.1 mA quiescent current per amplifier. It is widely deployed as a driver for 16-bit PulSAR® ADCs such as the AD7685/AD7686 in portable instrumentation.

For engineers reviewing the ADA4841-1YRJZ-R7 datasheet, ADA4841-1YRJZ-R7 pinout, ADA4841-1YRJZ-R7 application, or ADA4841-1YRJZ-R7 equivalent, key selection criteria include its 80 MHz −3 dB bandwidth (G = +1), 175 ns settling time to 0.1%, power-down capability, and operation from 2.7 V to 12 V supplies - all in a space-constrained 6-lead SOT-23 package.

Technical Context

The ADA4841-1YRJZ-R7 employs a precision PNP input stage with symmetrical folded cascode architecture on Analog Devices' XFCB process, enabling sub-1 µV/°C offset drift and 40 µV max input offset voltage. Its rail-to-rail output stage supports >99% of supply swing (±4.955 V on ±5 V) and drives ≥15 pF capacitive loads with minimal peaking.

It features a dedicated POWER DOWN pin (Pin 5) that reduces quiescent current to 35–70 µA when pulled low (<1.2 V on 3 V supply), with 1 µs enable and 40 µs disable switching times. Input common-mode range extends to the negative rail, and CMRR exceeds 88 dB across 0.1 Hz–10 MHz.

Key Specifications

Pinout & Package

ADA4841-1YRJZ-R7 is housed in a RoHS-compliant, lead-free 6-lead SOT-23 (RJ) package with exposed pad thermally connected to PCB ground. Pin 1 is marked by a dot; pin numbering follows standard SOT-23 orientation (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with OPA333AIDBVR and AD8605ARTZ-REEL7, ADA4841-1YRJZ-R7 uniquely balances 80 MHz bandwidth, 2.1 nV/√Hz noise, and integrated power-down - making it the only option among the three qualified for high-resolution, battery-operated, wideband signal acquisition.

Availability

ADA4841-1YRJZ-R7 is available at Aetrix Electronics and suitable for portable instrumentation, 16-bit ADC driver circuits, and medical sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4841-1YRJZ-R7 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.

The ADA4841 family was designed specifically for low-power, low-noise precision signal conditioning in battery-operated and high-channel-count measurement systems - emphasizing rail-to-rail output, power-down capability, and robustness across −40°C to +125°C.

FAQ

What is the maximum capacitive load the ADA4841-1YRJZ-R7 can drive stably?

The ADA4841-1YRJZ-R7 is characterized to drive ≥15 pF capacitive load with ≤30% overshoot in unity-gain configuration. At 20 pF, Figure 7 shows minor peaking (~0.5 dB) but remains stable; for >20 pF, a series isolation resistor (e.g., 10–22 Ω) is recommended between ADA4841-1YRJZ-R7 output and ADC input to maintain phase margin. This capability eliminates external compensation in most 16-bit ADC driver layouts.

Does the ADA4841-1YRJZ-R7 support single-supply operation?

Yes, ADA4841-1YRJZ-R7 operates from a single 2.7 V to 12 V supply. With −VS tied to ground, its input common-mode range extends from −0.1 V to +4 V (on 5 V supply), and output swings from 0.029 V to 4.974 V - enabling true single-supply interfacing with unipolar ADCs and microcontroller inputs. The POWER DOWN pin functions with logic levels referenced to the same supply.

What is the typical power-down current of the ADA4841-1YRJZ-R7?

The typical power-down current of ADA4841-1YRJZ-R7 is 35 µA at 3 V supply and 25 °C, with a maximum of 70 µA across temperature and voltage. When the POWER DOWN pin is pulled below 1.2 V (3 V supply), the amplifier disables internal bias networks, reducing total supply current by >96% versus the 1.1 mA active mode - critical for extending battery life in intermittent-sampling systems.

How does the ADA4841-1YRJZ-R7 achieve low 1/f noise?

The ADA4841-1YRJZ-R7 achieves 7 nV/√Hz 1/f noise at 10 Hz through its proprietary PNP input stage fabricated on Analog Devices' XFCB process, which minimizes flicker noise generation at the transistor level. Unlike CMOS op amps, this bipolar architecture inherently suppresses low-frequency noise without chopper stabilization - preserving signal integrity in DC-coupled, sub-100 Hz applications like ECG amplification without introducing switching artifacts.

Can the ADA4841-1YRJZ-R7 drive the AD7685 ADC directly?

Yes, ADA4841-1YRJZ-R7 is explicitly qualified to drive the AD7685 16-bit PulSAR® ADC. Its 175 ns 0.1% settling time, −105 dBc HD3 at 100 kHz, and ability to source 30 mA ensure full-scale steps settle within one ADC conversion cycle (1 µs for AD7685). Application Note AN-1020 confirms direct interface with no external components required beyond standard decoupling and feedback resistors.