Analog Devices Inc. ADA4000-2ARZ

Overview

ADA4000-2ARZ from Analog Devices is a dual-channel, precision JFET-input operational amplifier optimized for high-impedance signal conditioning and data acquisition interfaces. It delivers 5 MHz bandwidth, 20 V/μs slew rate, 1.70 mV max offset voltage, 40 pA max input bias current, and operates from ±4 V to ±18 V supplies - enabling accurate buffering of DAC outputs and ADC inputs in industrial sensor front-ends.

For engineers reviewing the ADA4000-2ARZ datasheet, ADA4000-2ARZ pinout, ADA4000-2ARZ application, or ADA4000-2ARZ equivalent, this page provides verified electrical specifications, SOIC-8 package layout, real-world settling time (≤1.2 μs to 0.1%), noise performance (16 nV/√Hz), and validated alternatives for precision analog signal chains.

Technical Context

The ADA4000-2ARZ employs a JFET input stage with 103 GΩ common-mode input impedance and rail-to-rail common-mode range extending to +V_S, supporting high-side sensing without level-shifting. Its unity-gain stable architecture features 60° phase margin at ±15 V and 55° at ±5 V, ensuring robustness with capacitive loads up to 1000 pF.

It achieves fast settling (≤1.2 μs to 0.1%) via low distortion output stage design and maintains precision across temperature (2 µV/°C offset drift, −40°C to +125°C operation). Input voltage noise (16 nV/√Hz) and current noise (0.01 pA/√Hz) are specified at 1 kHz, with 1 µV_p-p 0.1 Hz–10 Hz noise for low-frequency stability.

Key Specifications

Pinout & Package

ADA4000-2ARZ is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm height. Pin 1 is marked by a beveled corner or dot; device is RoHS-compliant and moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2134PA and AD823ARZ, ADA4000-2ARZ uniquely balances ultra-low input bias current (40 pA), 5 MHz bandwidth, and 1.2 µs settling in a single SOIC-8 package - making it optimal for high-impedance, medium-speed precision signal chains where leakage and settling time are co-critical.

Availability

ADA4000-2ARZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, power monitoring systems, and data acquisition front-ends requiring stable component supply across extended temperature ranges (−40°C to +125°C).

Supply support for ADA4000-2ARZ 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 ADA4000 family was designed specifically for precision signal conditioning in data acquisition, sensor interfacing, and industrial automation - emphasizing low bias current, wide supply range, and fast settling without sacrificing DC accuracy.

FAQ

What is the maximum capacitive load the ADA4000-2ARZ can drive stably in unity-gain configuration?

The ADA4000-2ARZ is specified to drive up to 1000 pF capacitively in unity-gain configuration without oscillation. This capability eliminates the need for series isolation resistors in ADC driver applications. For loads exceeding 1000 pF, a snubber network (e.g., 41 Ω + 10 nF) reduces overshoot from 30% to 6% and suppresses ringing, as validated in the official datasheet Figure 32. ADA4000-2ARZ maintains stability across its full ±4 V to ±18 V supply range under these conditions.

Does the ADA4000-2ARZ support operation with input voltages beyond the negative supply rail?

Yes - the ADA4000-2ARZ features a common-mode input voltage range that extends to the negative supply rail (V–) and up to the positive supply rail (+V_S). This rail-to-rail common-mode capability enables direct interfacing with high-side current sense resistors and sensors referenced to positive rails. However, phase reversal may occur if the input exceeds the absolute maximum common-mode range (±V_S); ADA4000-2ARZ datasheet recommends limiting input current to <5 mA to avoid damage or temporary malfunction.

What is the typical supply current per amplifier for ADA4000-2ARZ at ±15 V?

At ±15 V supply and 25°C, the typical supply current per amplifier in ADA4000-2ARZ is 1.65 mA, with a maximum of 1.80 mA over the full −40°C to +125°C operating range. This low quiescent current enables use in power-constrained industrial modules without thermal derating. The device draws identical current regardless of output loading under no-signal conditions, and current increases only marginally (<0.1 mA) when driving 2 kΩ loads, as confirmed in Figure 21 of the Rev. B datasheet.

Can ADA4000-2ARZ be used in single-supply configurations?

Yes - ADA4000-2ARZ operates with split supplies (±4 V to ±18 V) or single-ended supplies (e.g., +8 V to +36 V) as long as the total voltage difference between V+ and V– remains within ±4 V to ±18 V. In single-supply mode, the input common-mode range includes ground, allowing ground-referenced sensor signals. Output swing is typically within 1.1 V of each rail (e.g., 3.8 V to 4.2 V on +5 V supply), and the device remains unity-gain stable without external compensation.

How does the input bias current of ADA4000-2ARZ vary with temperature?

ADA4000-2ARZ exhibits ultra-low input bias current: 40 pA maximum at 25°C, rising to 170 pA at +85°C and 4.5 nA at +125°C. This behavior is inherent to JFET input technology and is documented in Table 1 and Figure 20 of the datasheet. At −40°C, bias current drops below 5 pA. Designers using ADA4000-2ARZ in high-impedance circuits (>100 MΩ) must account for this exponential increase above 85°C to maintain accuracy - for example, a 1 GΩ source contributes ≤0.17 mV error at +85°C but ≤4.5 mV at +125°C.