Analog Devices Inc. ADA4627-1ACPZ-R7

Overview

ADA4627-1ACPZ-R7 from Analog Devices is a 30 V, JFET-input precision operational amplifier optimized for high-impedance sensor interfaces and low-noise signal conditioning. It delivers 19 MHz gain bandwidth, 82 V/μs slew rate, 6.1 nV/√Hz voltage noise at 1 kHz, and 5 pA maximum input bias current across −40°C to +125°C - enabling photodiode amplification and precision instrumentation in harsh environments.

For engineers reviewing the ADA4627-1ACPZ-R7 datasheet, ADA4627-1ACPZ-R7 pinout, ADA4627-1ACPZ-R7 application, or ADA4627-1ACPZ-R7 equivalent, key selection criteria include guaranteed 5 pA max input bias current at 125°C, ±15 V dual-supply operation, LFCSP package thermal performance (θJA = 77°C/W), and unity-gain stability without external compensation.

Technical Context

The ADA4627-1ACPZ-R7 employs a JFET input stage to achieve ultra-low input bias current and low voltage noise simultaneously. Its fully differential architecture supports rail-referenced common-mode input range (−11 V to +11 V on ±15 V supplies) and delivers 120 dB typical open-loop gain with 116 dB CMRR and 112 dB PSRR - critical for DC-coupled precision measurement paths.

It features no output phase reversal, operates stably at unity gain, and maintains 72° phase margin with 20 pF capacitive load. The device uses laser-trimmed thin-film resistors for <70 μV typical offset and <1 μV/°C drift, eliminating need for external nulling in most applications.

Key Specifications

Pinout & Package

ADA4627-1ACPZ-R7 is housed in an 8-lead LFCSP_VD (CP-8-13) package with exposed pad. Thermal resistance θJA = 77°C/W requires soldering the exposed pad to a PCB copper plane for reliable power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4625-1ACPZ-R7, the ADA4627-1ACPZ-R7 provides 58% higher bandwidth and 4× faster settling for time-critical measurements; versus OPA140AIDBVR, it guarantees sub-nA bias current at 125°C and delivers 4× higher slew rate - making it the sole option for high-temperature, high-fidelity analog capture.

Availability

ADA4627-1ACPZ-R7 is available at Aetrix Electronics and suitable for precision instrumentation, photodiode amplification, and phase-locked loop filter design requiring stable component supply across automotive, industrial, and test & measurement programs.

Supply support for ADA4627-1ACPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADA4627-1ACPZ-R7 belongs to Analog Devices' high-speed precision op amp family, engineered specifically for applications demanding simultaneous low noise, low bias current, and wide bandwidth in extreme temperature environments.

FAQ

What is the maximum input bias current specification for ADA4627-1ACPZ-R7 at 125°C?

The ADA4627-1ACPZ-R7 has a maximum input bias current of 2 nA at +125°C, as specified in Table 2 of the Rev. F datasheet under "−40°C ≤ TA ≤ +125°C" conditions. This value reflects worst-case characterization across process, voltage, and temperature corners - critical for ensuring accuracy in high-impedance sensor interfaces operating in under-hood or industrial settings where ambient temperatures exceed 85°C.

Does ADA4627-1ACPZ-R7 require external compensation for unity-gain stability?

No, ADA4627-1ACPZ-R7 is unity-gain stable with 72° phase margin and does not require external compensation. The Rev. F datasheet confirms stability at AV = 1 with 20 pF capacitive load (Figure 7). This eliminates the need for feedback capacitors or zero-cancel networks in buffer, follower, or gain-of-two configurations - simplifying layout and improving reliability in space-constrained LFCSP designs.

How is the exposed thermal pad on the ADA4627-1ACPZ-R7 package intended to be connected?

The exposed pad of the ADA4627-1ACPZ-R7 (CP-8-13) must be soldered directly to the PCB's V− plane to achieve the specified θJA = 77°C/W. Note 2 in the Pin Configurations section explicitly recommends connecting the exposed pad to V−. This connection provides both optimal thermal dissipation and lowest possible ground impedance for noise-sensitive analog nodes - failure to do so degrades PSRR and increases junction temperature beyond ratings.

Can ADA4627-1ACPZ-R7 be used in inverting amplifier configurations with high feedback resistors?

Yes, ADA4627-1ACPZ-R7 supports inverting configurations with feedback resistors up to 10 MΩ while maintaining stability and low noise. Its JFET input minimizes current noise contribution, and the datasheet Figure 48 shows a validated inverting stage with 499 kΩ resistors. For >1 MΩ values, guard traces around −IN and feedback nodes are mandatory to prevent PCB leakage from exceeding the 5 pA input bias current spec.

What is the guaranteed minimum open-loop gain for ADA4627-1ACPZ-R7 at 125°C?

The guaranteed minimum open-loop gain for ADA4627-1ACPZ-R7 is 102 dB at −40°C ≤ TA ≤ +125°C, per Table 2 "Large Signal Voltage Gain" row. This corresponds to a minimum DC gain of ~126,000 V/V - sufficient to support 16-bit accuracy (0.0015% error) in closed-loop gains up to 100 without significant gain error, even at maximum operating temperature.