Analog Devices Inc. ADA4004-1ARZ

Overview

ADA4004-1ARZ from Analog Devices is a single-channel, precision operational amplifier optimized for low-noise, high-accuracy signal conditioning in ±5 V to ±15 V systems. It delivers 1.8 nV/√Hz voltage noise density, 12 MHz gain bandwidth, 120 dB open-loop gain, and 0.7 µV/°C offset drift - enabling high-fidelity amplification in thermocouple interfaces, reference buffers, and medical instrumentation front-ends.

For engineers reviewing the ADA4004-1ARZ datasheet, ADA4004-1ARZ pinout, ADA4004-1ARZ application, or ADA4004-1ARZ equivalent, key selection criteria include its 1.8 nV/√Hz noise floor, rail-to-rail output swing capability (±3.6 V at ±5 V supply), 2.2 mA supply current, −40°C to +125°C operating range, and SOIC-8 package compatibility with legacy layout footprints.

Technical Context

The ADA4004-1ARZ employs Analog Devices' iPolar™ process to achieve simultaneous low noise (1.8 nV/√Hz), low power (2.2 mA), and high DC precision (125 µV max offset, 0.7 µV/°C drift). Its 12 MHz GBP and 2.7 V/µs slew rate support stable unity-gain and closed-loop configurations up to G = +100 without phase reversal.

Designed for wide-supply operation (±5 V to ±15 V), it maintains 110 dB PSRR and 105 dB CMRR across temperature, with output swing to within 350 mV of rails into 2 kΩ loads - critical for precision sensor signal chains where headroom and common-mode rejection directly impact measurement fidelity.

Key Specifications

Pinout & Package

ADA4004-1ARZ is housed in an 8-lead SOIC_N (R-8) package with exposed pad grounded to V− per datasheet recommendation. Pin 1 is marked with a notch or dot; the device features no internal ESD diodes to supply rails, requiring external protection in high-transient environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8675ARZ and OP27GSZ-REEL7, the ADA4004-1ARZ uniquely balances 1.8 nV/√Hz noise, 2.2 mA supply current, and 0.7 µV/°C drift in a single SOIC-8 footprint - making it optimal for space- and power-constrained precision measurement systems requiring long-term stability.

Availability

ADA4004-1ARZ is available at Aetrix Electronics and suitable for precision instrumentation, industrial control, and medical device applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4004-1ARZ 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 ADA4004 family was designed specifically for high-accuracy, low-noise signal conditioning in demanding industrial, medical, and test & measurement applications - emphasizing DC precision, thermal stability, and noise performance over raw speed.

FAQ

What is the maximum supply voltage for ADA4004-1ARZ?

The ADA4004-1ARZ supports absolute maximum supply voltages of ±18 V or +36 V single-ended. However, its specified operating range is ±5 V to ±15 V. Operation at ±18 V is not characterized and may degrade long-term reliability or parametric performance. For robust design, limit supplies to ±15 V as validated in all electrical specifications tables.

Does ADA4004-1ARZ have rail-to-rail input or output capability?

The ADA4004-1ARZ does not feature rail-to-rail input; its input voltage range is specified as −3.5 V to +3.5 V with ±5 V supplies. Its output is not rail-to-rail either - it swings to within 350 mV of each rail (±3.6 V out of ±5 V). This limited output swing is intentional to preserve linearity and PSRR at extremes, and is fully characterized in Table 2 and Figure 13.

Is the exposed pad on ADA4004-1ARZ electrically connected?

Yes - the exposed pad on the ADA4004-1ARZ SOIC-8 package (R-8) is internally connected to the V− pin. Per datasheet Figure 2 and Note 2, it must be soldered to a PCB copper pour tied to the V− net to achieve specified thermal resistance (θJA = 177°C/W) and ensure reliable operation at full temperature range. Leaving it unconnected degrades thermal performance by >40°C/W.

Can ADA4004-1ARZ drive capacitive loads without oscillation?

ADA4004-1ARZ remains stable with ≤1 nF capacitive loads in unity-gain configuration, as verified in Figure 30 (small-signal overshoot <5% at CL = 1 nF). For larger loads (e.g., ADC input capacitance >10 nF), an isolation resistor (20–100 Ω) between output and load is required. The device exhibits no phase reversal (Figure 32), eliminating latch-up risk during overdrive.

What is the typical 0.1 Hz to 10 Hz peak-to-peak noise of ADA4004-1ARZ?

The typical 0.1 Hz to 10 Hz input-referred voltage noise for ADA4004-1ARZ is 0.1 µV p-p at ±5 V supply (Table 2) and 0.15 µV p-p at ±15 V supply (Table 3). This ultra-low flicker noise - combined with its 6 Hz 1/f corner - makes it especially effective in DC-coupled, low-frequency applications such as strain gauge and thermopile amplifiers where long-term baseline stability is critical.