Analog Devices Inc. ADA4000-4ARZ-R7

Overview

ADA4000-4ARZ-R7 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 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 ADA4000-4ARZ-R7 datasheet, ADA4000-4ARZ-R7 pinout, ADA4000-4ARZ-R7 application, or ADA4000-4ARZ-R7 equivalent, key selection considerations include its rail-to-rail input common-mode range (including +V_S), low 16 nV/√Hz voltage noise, and stability driving up to 1000 pF capacitive loads - critical for high-side sensing and fast-settling sample-and-hold circuits.

Technical Context

The ADA4000-4ARZ-R7 implements a JFET-input differential pair with high-impedance (>10 GΩ) common-mode input stage, enabling operation with input voltages extending to the positive supply rail. Its unity-gain stable architecture supports both inverting and noninverting configurations without external compensation.

It features internal phase-margin optimization (60° at ±15 V) and robust capacitive load drive capability (≤1000 pF), while maintaining fast settling (<1.2 µs to 0.1%) and low distortion across its 5 MHz bandwidth - essential for precision analog front-ends in automated test equipment and power monitoring systems.

Key Specifications

Pinout & Package

ADA4000-4ARZ-R7 is housed in a 14-lead SOIC_N (R-14) package with standard 1.27 mm pitch, 8.75 mm × 4.00 mm body, and exposed pad not present. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012-AB.

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 LT1014DN-4, ADA4000-4ARZ-R7 uniquely balances ultra-low bias current (40 pA), wide bandwidth (5 MHz), and rail-to-rail input range - making it optimal for high-impedance, high-speed precision signal chains where other alternatives trade off speed, noise, or input stage architecture.

Availability

ADA4000-4ARZ-R7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, power quality analyzers, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADA4000-4ARZ-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 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-input-impedance signal conditioning in data acquisition and sensor interface applications - emphasizing JFET input architecture, fast settling, and robust capacitive load drive.

FAQ

What is the maximum capacitive load the ADA4000-4ARZ-R7 can drive without oscillation?

The ADA4000-4ARZ-R7 is specified to drive up to 1000 pF capacitive loads stably in unity-gain configuration without external compensation. This capability eliminates the need for series isolation resistors when interfacing with ADC input capacitance 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, as verified in Figure 32 of the ADA4000-4ARZ-R7 datasheet.

Does the ADA4000-4ARZ-R7 support operation with input voltages beyond the supply rails?

No - the ADA4000-4ARZ-R7 absolute maximum ratings specify input voltage range as ±V_S, and the common-mode input voltage extends only to +V_S (not beyond). Exceeding the supply rails risks phase reversal or latch-up. The device's key advantage is inclusion of the positive supply in its common-mode range, enabling high-side sensing, but it does not support overvoltage-tolerant inputs. External clamping or attenuation is required for signals exceeding ±V_S.

What is the typical supply current per amplifier for ADA4000-4ARZ-R7 at ±15 V?

At ±15 V supply and 25°C, the ADA4000-4ARZ-R7 draws 1.35 mA to 1.65 mA per amplifier (Table 1), totaling 5.4–6.6 mA for all four channels. Over temperature (–40°C to +125°C), supply current remains tightly bounded at ≤1.80 mA per amplifier. This low quiescent current enables use in power-constrained industrial modules without thermal derating concerns.

Can ADA4000-4ARZ-R7 be used in single-supply configurations?

Yes - the ADA4000-4ARZ-R7 operates with total supply voltages from ±4 V to ±18 V, which includes asymmetric and single-supply equivalents (e.g., +5 V and ground = +2.5 V and –2.5 V equivalent). Its input common-mode range includes the positive rail, allowing the non-inverting input to accept signals up to +V_CC in single-supply setups. However, output swing is limited to ~1.4 V from each rail, so full rail-to-rail output is not supported.

What is the settling time specification for ADA4000-4ARZ-R7, and under what conditions is it measured?

The ADA4000-4ARZ-R7 settles to within 0.1% of final value in less than 1.2 µs. This is measured using a 10 V step input in unity-gain buffer configuration with ±15 V supplies and RL = 2 kΩ, per the false summing node method shown in Figure 33 of the datasheet. The specification holds across the full operating temperature range (–40°C to +125°C) and is critical for high-speed data acquisition systems where amplifier settling contributes directly to total conversion time.