Analog Devices Inc. AD8513ARZ-REEL

Overview

AD8513ARZ-REEL from Analog Devices is a quad precision JFET operational amplifier optimized for high-impedance sensor signal conditioning and low-noise current measurement. It delivers 400 μV max offset voltage, 8 nV/√Hz voltage noise at 1 kHz, 20 V/μs slew rate, and operates from ±5 V to ±15 V supplies across −40°C to +125°C - enabling use in photodiode amplifiers and medical instrumentation front-ends.

For engineers reviewing the AD8513ARZ-REEL datasheet, AD8513ARZ-REEL pinout, AD8513ARZ-REEL application, or AD8513ARZ-REEL equivalent, key selection criteria include guaranteed 0.1% settling in 500 ns, no phase reversal under overvoltage, and stable operation with up to 1000 pF capacitive loads - critical for precision DAC buffering and multipole filter design.

Technical Context

The AD8513ARZ-REEL implements a unity-gain-stable JFET input stage with rail-to-rail output swing capability and internal input overvoltage protection (±0.7 V beyond rails). Its architecture maintains fast settling (≤500 ns to 0.1%) and low distortion (0.0005% THD+N) even with substantial capacitive loading, eliminating need for external compensation in most filter and I-V conversion topologies.

Unlike legacy JFET op-amps, it avoids output phase reversal when inputs exceed common-mode range and achieves >52° phase margin into 2.5 kΩ + 1 nF loads - enabling robust performance in high-precision analog signal chains where stability under varying source impedance is essential.

Key Specifications

Pinout & Package

AD8513ARZ-REEL is packaged in a 14-lead SOIC_N (R suffix) with standard JEDEC outline, 1.27 mm pitch, and 8.65 mm × 3.90 mm body size. Thermal resistance θ_JA is 120°C/W on 2-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211IDR and ADA4625-2ARZ, AD8513ARZ-REEL uniquely combines quad-channel integration, 25 pA input bias current, and guaranteed 500 ns 0.1% settling - making it optimal for compact, multi-sensor systems demanding matched performance and minimal board area.

Availability

AD8513ARZ-REEL is available at Aetrix Electronics and suitable for photodiode amplifiers, precision current measurement circuits, and multipole active filters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8513ARZ-REEL 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 AD851x family was designed specifically for precision instrumentation and sensor signal conditioning - emphasizing low input bias current, low noise, and rail-to-rail output drive in JFET-input architectures for demanding measurement applications.

FAQ

What is the maximum capacitive load the AD8513ARZ-REEL can drive without oscillation?

The AD8513ARZ-REEL is unconditionally stable and can drive up to 1000 pF in unity-gain configuration without oscillation. This capability eliminates the need for external isolation resistors in photodiode transimpedance amplifier designs and simplifies layout for high-frequency sensor interfaces. Performance data confirms stability under worst-case conditions including 2.5 kΩ resistive load in parallel with 1 nF capacitance.

Does the AD8513ARZ-REEL exhibit phase reversal when input voltages exceed the supply rails?

No, the AD8513ARZ-REEL does not exhibit phase reversal when input voltages exceed the maximum common-mode range. Internal protection circuitry ensures polarity integrity even when inputs go as far as ±0.7 V beyond the supply rails - a critical reliability feature for systems exposed to transient overvoltages or improper sensor biasing. This behavior is explicitly verified in Figure 40 of the Rev. K datasheet.

What is the typical input bias current of the AD8513ARZ-REEL at ±15 V supply?

The typical input bias current of the AD8513ARZ-REEL is 25 pA at ±15 V supply and 25°C, with a maximum of 80 pA across the full −40°C to +125°C operating range. This ultra-low value enables accurate amplification of signals from high-impedance sources such as piezoelectric sensors, pH electrodes, and photodiodes without introducing significant DC error or drift.

How does the AD8513ARZ-REEL perform in precision current measurement using shunt resistors?

The AD8513ARZ-REEL excels in precision shunt-based current measurement due to its 0.4 mV maximum offset voltage (B grade), 1 μV/°C typical TCVOS, and 25 pA input bias current. These specifications ensure sub-0.1% gain error across industrial temperatures and negligible voltage drop error across shunts up to 10 MΩ - directly supporting high-accuracy battery monitoring and motor control applications.

Is the AD8513ARZ-REEL suitable for driving ADC inputs after DAC buffering?

Yes, the AD8513ARZ-REEL is specifically suited for DAC output buffering prior to ADC sampling. Its 500 ns settling time to 0.1% for a 0–4 V step and 20 V/μs slew rate match or exceed the settling requirements of 12-bit and 14-bit DACs. Combined with low THD+N (0.0005%) and rail-to-rail output swing, it preserves signal integrity and minimizes code-dependent distortion in closed-loop data acquisition systems.