Analog Devices Inc. ADA4000-4ARZ

Overview

ADA4000-4ARZ from Analog Devices is a quad-channel, JFET-input precision operational amplifier optimized for high-impedance signal conditioning and data acquisition. It delivers 5 MHz gain bandwidth, 20 V/µs slew rate, ±4 V to ±18 V dual-supply operation, and 1.70 mV max input offset voltage - enabling accurate buffering of ADC inputs and DAC outputs in industrial sensor interfaces and power monitoring systems.

For engineers reviewing the ADA4000-4ARZ datasheet, ADA4000-4ARZ pinout, ADA4000-4ARZ application, or ADA4000-4ARZ equivalent, key selection considerations include its rail-to-rail input common-mode range (including +V_S), ultra-low 40 pA max input bias current at 25°C, low 16 nV/√Hz voltage noise, and guaranteed stability driving ≥1000 pF capacitive loads in unity-gain configurations.

Technical Context

The ADA4000-4ARZ integrates four independent JFET-input op-amps in a single 14-lead SOIC package, each featuring unity-gain stability, phase margin ≥60° at ±15 V, and input common-mode voltage extending to the positive supply rail - critical for high-side current sensing and level-shifting applications. Its differential input impedance exceeds 10 GΩ || 4 pF, and common-mode impedance reaches 103 GΩ || 5.5 pF.

Designed for precision analog front-ends, it supports fast settling to 0.1% in <1.2 µs, operates across −40°C to +125°C, and maintains low distortion and minimal output phase reversal under overvoltage conditions - validated per Analog Devices' Rev. B datasheet with full electrical characterization at ±5 V and ±15 V supplies.

Key Specifications

Pinout & Package

ADA4000-4ARZ is housed in a 14-lead SOIC_N (R-14) package, 8.75 mm × 4.00 mm footprint, 1.75 mm height, JEDEC MS-012-AB compliant. Pin 1 is marked by a beveled corner or dot; device is RoHS-compliant and rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4134UA and LT1492CN, ADA4000-4ARZ uniquely balances ultra-low input bias current (40 pA), 5 MHz bandwidth, and +V_S-inclusive input range - making it optimal for high-accuracy, high-impedance industrial signal chains where all three parameters are simultaneously critical.

Availability

ADA4000-4ARZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, power quality analyzers, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4000-4ARZ 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 centers worldwide.

The ADA4000 family was developed specifically for precision, low-power, high-input-impedance signal conditioning in industrial, test, and measurement equipment - emphasizing JFET input architecture for minimal bias current and wide supply flexibility.

FAQ

What is the maximum capacitive load the ADA4000-4ARZ can drive without oscillation?

The ADA4000-4ARZ is stable driving up to 1000 pF in unity-gain configuration, as confirmed in the Rev. B datasheet. This capability eliminates the need for external isolation resistors when interfacing with typical ADC input capacitances (e.g., 10–50 pF) or long PCB traces. For loads exceeding 1000 pF, a snubber network (e.g., 41 Ω + 10 nF) reduces overshoot from 30% to 6% and suppresses ringing - verified in Figure 32 of the ADA4000-4ARZ datasheet.

Does the ADA4000-4ARZ support operation from a single +5 V supply?

No - the ADA4000-4ARZ is specified only for dual-supply operation from ±4 V to ±18 V. It does not support true single-supply use (e.g., +5 V and ground), because its input common-mode range, while including +V_S, does not extend to ground when operated on a single rail. For single-supply applications, consider rail-to-rail input/output op-amps like the AD8605 or ADA4661-2 instead of ADA4000-4ARZ.

What is the thermal resistance (θ_JA) of the ADA4000-4ARZ in its SOIC package?

The ADA4000-4ARZ in the 14-lead SOIC_N (R-14) package has a junction-to-ambient thermal resistance (θ_JA) of 88.2°C/W, as listed in Table 4 of the Rev. B datasheet. This value assumes worst-case PCB mounting (surface-mount on standard FR-4 with no copper pour). With 2-in² copper pour, θ_JA improves to ~50°C/W - critical for thermal design in high-density industrial modules where ADA4000-4ARZ may dissipate up to 110 mW (4 × 1.65 mA × 15 V).

How does the ADA4000-4ARZ handle input overvoltage conditions that exceed the common-mode range?

When input voltage exceeds the common-mode range, the ADA4000-4ARZ exhibits temporary phase reversal - a polarity inversion in the transfer function - caused by saturation and forward-biasing of the JFET input stage's drain-gate diode. The device recovers automatically once the input returns within range. To mitigate this in noninverting configurations, a series resistor (value dependent on source impedance and noise budget) is recommended between signal source and +IN pin, as detailed in the Applications Information section of the ADA4000-4ARZ datasheet.

Is the ADA4000-4ARZ pin-compatible with other quad op-amps in SOIC-14 packages?

No - the ADA4000-4ARZ uses a proprietary pinout optimized for quad-channel symmetry and power rail distribution (e.g., shared –V on Pins 8 and 11), differing from industry-standard SOIC-14 op-amp layouts like the LM324 or TL084. Substituting ADA4000-4ARZ into an existing LM324-based layout requires PCB redesign. Always verify pin mapping using Figure 5 and Figure 6 in the ADA4000-4ARZ datasheet before layout integration.