Analog Devices Inc. ADA4000-2ARZ-RL

Overview

ADA4000-2ARZ-RL from Analog Devices is a dual-channel, JFET-input precision operational amplifier optimized for high-impedance signal conditioning and data acquisition. It delivers 5 MHz bandwidth, 20 V/µs slew rate, 1.70 mV max offset voltage, and 40 pA max input bias current at ±15 V supply, enabling accurate buffering of ADC inputs and DAC outputs in industrial sensor interfaces.

For engineers reviewing the ADA4000-2ARZ-RL datasheet, ADA4000-2ARZ-RL pinout, ADA4000-2ARZ-RL application, or ADA4000-2ARZ-RL equivalent, key selection criteria include input bias current stability over temperature, rail-to-rail common-mode range (including +V_S), unity-gain stability with capacitive loads up to 1000 pF, and low 16 nV/√Hz voltage noise at 1 kHz.

Technical Context

The ADA4000-2ARZ-RL employs a JFET input stage delivering ultra-low input bias current (≤40 pA typ) and high input impedance (103 GΩ||5.5 pF common-mode), making it suitable for photodiode amplification and high-impedance source interfacing. Its input common-mode voltage extends to +V_S, supporting high-side sensing without level-shifting circuitry.

It features unity-gain stability, 60° phase margin at ±15 V, and fast settling to 0.1% in <1.2 µs - critical for multiplexed data acquisition systems. The device maintains 5 MHz gain-bandwidth and 20 V/µs slew rate across ±4 V to ±18 V supply operation, with PSRR >92 dB and CMRR >100 dB over −40°C to +125°C.

Key Specifications

Pinout & Package

ADA4000-2ARZ-RL is housed in an 8-lead SOIC_N (R-8) package with standard pinout and no internal connections on pins 1 and 8. The package meets JEDEC MS-012-AA standards, with 1.27 mm lead pitch and 5.00 × 4.00 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2134UA and LT1028CS8#PBF, ADA4000-2ARZ-RL uniquely balances ultra-low bias current (40 pA), +V_S-inclusive common-mode range, and 5 MHz bandwidth - making it the only option among the three qualified for high-impedance, high-side, precision signal conditioning without design compromise.

Availability

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

Supply support for ADA4000-2ARZ-RL 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADA4000 family was designed specifically for precision, low-power, high-impedance signal conditioning in harsh environments - targeting applications where input bias current, common-mode range, and noise performance directly impact measurement fidelity.

FAQ

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

The ADA4000-2ARZ-RL is specified to drive up to 1000 pF of capacitive load without oscillation in unity-gain configuration. This capability is verified per datasheet Figure 27 and Application Information section, enabling direct interface to ADC input capacitance, long PCB traces, and LCD column drivers without external isolation resistors or compensation networks. For loads exceeding 1000 pF, a snubber network (e.g., 41 Ω + 10 nF) restores stability while preserving gain accuracy.

Does the ADA4000-2ARZ-RL support operation with single-supply voltages?

Yes, the ADA4000-2ARZ-RL operates from split supplies (±4 V to ±18 V) and can be used in single-supply configurations (e.g., +5 V and ground) provided the input common-mode voltage remains within specification (−1.0 V to +5.0 V at ±5 V supply). Its input stage includes +V_S in the common-mode range, allowing high-side sensing even in single-supply setups - but output swing is limited to ~3.8 V high and ~−3.0 V low under those conditions.

What is the guaranteed maximum input offset voltage for ADA4000-2ARZ-RL over temperature?

The ADA4000-2ARZ-RL guarantees a maximum input offset voltage of 3.0 mV over the full operating temperature range of −40°C to +125°C, as specified in Table 1 of the Rev. B datasheet. At 25°C, the limit is tighter: 1.70 mV maximum. This ensures predictable DC accuracy in thermocouple amplifiers, strain gauge bridges, and other temperature-varying precision circuits without active calibration.

How does the ADA4000-2ARZ-RL handle input overvoltage conditions that exceed the common-mode range?

When input voltage exceeds the common-mode range, the ADA4000-2ARZ-RL may exhibit temporary phase reversal - a polarity inversion in the transfer function caused by saturation of the JFET input stage. This effect is self-recovering once the input returns within range. To prevent it, a series resistor (value dependent on source impedance and noise budget) is recommended at the non-inverting input, as detailed in the Applications Information section on Output Phase Reversal.

Is the ADA4000-2ARZ-RL RoHS compliant and lead-free?

Yes, the "Z" suffix in ADA4000-2ARZ-RL indicates RoHS compliance per Analog Devices' ordering guide (Rev. B, Page 14). The part uses lead-free matte tin finish on leads and conforms to EU Directive 2011/65/EU and related amendments. No lead or hazardous substances exceeding threshold limits are present in the final packaged device.