36 V, 18 MHz, Low Noise, Fast Settling Single Supply, RRO, JFET Op Amp

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Part Details
Part Models 3
1ku List Price Starting From $4.42
  • Wide gain bandwidth product: 18 MHz typical
  • High slew rate: 48 V/µs typical
  • Low voltage noise density: 3.3 nV/√Hz typical at 1 kHz
  • Low peak-to-peak noise: 0.15 µV p-p, 0.1 Hz to 10 Hz
  • Low input bias current: ±15 pA typical at TA = 25°C
  • Low offset voltage: ±80 µV maximum at TA = 25°C
  • Offset voltage drift: ±1.2 µV/°C maximum at TA = −40°C to 85°C
  • Fast settling: 0.01% in 700 ns typical
  • Wide range of operating voltages
    • Dual-supply operation: ±2.5 V to ±18 V
    • Single-supply operation: 5 V to 36 V
  • Input voltage range includes V−
  • Rail-to-rail output
  • High capacitive load drive capability
  • Output short-circuit current: ±46 mA
  • No phase reversal
  • Unity-gain stable
Additional Details
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The ADA4625-1/ADA4625-2 build on Analog Devices, Inc., high voltage, single-supply, rail-to-rail output (RRO), precision junction field effect transistor (JFET) input op amps, taking that product type to a level of speed and low noise that has not been made available to the market previously.

The ADA4625-1/ADA4625-2 provide optimal performance in high voltage, high gain, and low noise applications. The input common-mode voltage range includes the negative supply, and the output swings rail to rail. This enables the user to maximize dynamic input range in low voltage, single supply applications without the need for a separate negative voltage power supply for ground sense.

The combination of wide bandwidth, low noise, and low input bias current makes the ADA4625-1/ADA4625-2 especially suitable for phase-locked loop (PLL), active filter amplifiers and for high tuning voltage (VTUNE), voltage controlled oscillators (VCOs) and preamplifiers where low level signals require an amplifier that provides both high amplification and wide bandwidth.

The ADA4625-1/ADA4625-2 are unity-gain stable, and there is no phase reversal when input range exceeds either supply rail by 200 mV. The output is capable of driving loads up to 1000 pF and/or 600 Ω loads.

The ADA4625-1/ADA4625-2 are specified for operation over the extended industrial temperature range of −40°C to +125°C and operates from +5 V to +36 V (±2.5 V to ±18 V) with specifications at +5 V and ±18 V. The devices are available in an 8-lead SOIC package with an exposed pad (EPAD).


  • PLL filter amplifiers
  • Transimpedance amplifiers
  • Photodiode sensor interfaces
  • Low noise charge amplifiers
Part Models 3
1ku List Price Starting From $4.42

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Evaluation Kit

Evaluation Kits 1

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ADA4625-1 Evaluation Board



ADA4625-1 Evaluation Board

ADA4625-1 Evaluation Board

Features and Benefits

  • Full featured evaluation board for the ADA4625-1
  • Enables quick prototyping
  • User defined circuit configuration
  • Edge mounted SMA connector provisions
  • Easy connection to test equipment and other circuits

Product Detail

UG-1201 describes the evaluation board for the ADA4625-1 low noise, fast settling, single supply, rail-to-rail output (RRO), junction field effect transistor (JFET) op amp in an 8-lead small outline integrated circuit (SOIC) package with an exposed pad. The design of this evaluation board emphasizes simplicity and ease of use. This evaluation board is a 2-layer board that accommodates edge mounted SubMiniature version A (SMA) connectors on the inputs and outputs. The SMA connectors allow efficient connection to test equipment or other circuitry.

The evaluation board ground plane, components placement, and power supply bypassing are optimized for maximum circuit flexibility and performance. The exposed pad of the ADA4625-1 is connected to the ground plane on the evaluation board to enhance thermal and noise performance. The evaluation board uses a combination of surface mount technology (SMT) component case sizes 0603 and 0805, with the exception of the bypass capacitors, Capacitor C3 and Capacitor C5, which have a maximum standard size of 1206. The evaluation board also features a variety of unpopulated resistor and capacitor pads, which provide the user with multiple choices and extensive flexibility for different application circuits and configurations, such as active loop filters, transimpedance amplifiers (TIAs), and charge amplifiers.

The ADA4625-1 data sheet covers the specifications and details of the device operation and application circuit configurations and guidance. Consult the data sheet in conjunction with UG-1201 for a better understanding of the device operation, especially when powering up the evaluation board for the first time.

Tools & Simulations

Tools & Simulations 6

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Reference Designs

Reference Designs 1

Figure 1. CN0568 Block Diagram

Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer

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Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer


Circuits from the lab

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Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer

Features and Benefits

  • 8GHz - 26GHz Frequency Operation
  • Quadband VCO provides Low Phase Noise over Wideband
  • Onboard Reference Clock for ease of Use
  • Arduino Form Factor Compatible
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Design & Integration Tools

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2.02 M


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Sep 02, 2022


Ultra-Fast Switching, High Performance PLL Frequency Synthesizer

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