ADA4622-2

RECOMMENDED FOR NEW DESIGNS

30 V, 7.5 MHz, Low Bias Current, Single Supply, RRO, Precision Op Amp

Data Sheet (Rev. F) Product Selection Table
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Overview

  • Next generation of the AD820/AD822/AD824
  • Wide gain bandwidth product: 8 MHz typical
  • High slew rate
    • 23V/µs typical (low to high)
    • −18V/µs typical (high to low)
  • Low input bias current: ±10 pA maximum at TA = 25°C
  • Low offset voltage
    • A grade: ±0.8 mV maximum at TA = 25°C
    • B grade: ±0.35 mV maximum at TA = 25°C
  • Low offset voltage drift
    • A grade: ±4 μV/°C maximum
    • B grade: ±2 μV/°C maximum (ADA4622-2 only)
    • B grade: ±1 μV/°C maximum (ADA4622-1 only)
  • Input voltage range includes Pin V−
  • Rail-to-rail output
  • Electromagnetic interference rejection ratio (EMIRR)
    • 90 dB typical at f = 1000 MHz and f = 2400 MHz
  • Industry-standard package and pinout

The ADA4622-1/ADA4622-2/ADA4622-4 are the next generation of the AD820/AD822/AD824 single-supply, rail-to-rail output (RRO), precision junction field effect transistors (JFET) input op amps. The ADA4622-1/ADA4622-2/ADA4622-4 include many improvements that make them desirable as upgrades without compromising the flexibility and ease of use that makes the AD820/AD822/AD824 useful for a wide variety of applications.

The input voltage range includes the negative supply and the output swings rail-to-rail. Input EMI filters increase the signal robustness in the face of closely located switching noise sources.

The speed, in terms of bandwidth and slew rate, increases along with a strong output drive to improve settling time performance and enables the devices to drive the inputs of modern single-ended, successive approximation register (SAR) analog-to-digital converters (ADCs).

Voltage noise is reduced; although the supply current remains the same as the AD820/AD822/AD824, broadband noise is reduced by 25%, and 1/f is reduced by half. DC precision in the ADA4622-1/ADA4622-2/ADA4622-4 improved from the AD820/AD822/AD824 with half the offset and a maximum thermal drift specification added to the ADA4622-1/ADA4622-2/ADA4622-4. The common-mode rejection ratio (CMRR) is improved from the AD820/AD822/AD824 to make the ADA4622-1/ADA4622-2/ADA4622-4 more suitable when used in noninverting gain and difference amplifier configurations.

The ADA4622-1/ADA4622-2/ADA4622-4 are specified for operation over the extended industrial temperature range of −40°C to +125°C, and operate from 5 V to 30 V, with specifications at +5 V, ±5 V, and ±15 V. The ADA4622-1 is available in a 5-lead SOT-23 package and an 8-lead LFCSP package. The ADA4622-2 is available in an 8-lead SOIC_N package, an 8-lead MSOP package, and an 8-lead LFCSP package. The ADA4622-4 is available in a 14-lead SOIC_N and a 16-lead, 4 × 4 mm LFCSP.

APPLICATIONS

  • High output impedance sensor interfaces
  • Photodiode sensor interfaces
  • Transimpedance amplifiers
  • ADC drivers
  • Precision filters and signal conditioning
ADA4622-2

30 V, 7.5 MHz, Low Bias Current, Single Supply, RRO, Precision Op Amp

ADA4622-2 Pin Configuration ADA4622-2 Pin Configuration ADA4622-2 Pin Configuration ADA4622-2 Pin Configuration
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Documentation

Data Sheet 1

Application Note 2

Technical Articles 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • ADA4622

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

Open Tool

Signal Chain Designer

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

Open Tool

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

Open Tool

SPICE Model 1

LTspice

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.

Evaluation Kits

eval board
schematic 1
EVAL-ADA4622-2

ADA4622-2 Evaluation Board 

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Features and Benefits

  • Full featured evaluation board for dual low bias current amplifiers in narrow-body SOIC
  • Enables quick prototyping
  • User defined circuit configuration
  • Edge mounted SMA connector provisions
  • Easy connection to test equipment and other circuits
  • Available provision for photodiode for quick evaluation
    • Connections available for photodiode bias
    • Guard trace available to minimize leakage

Product Details

This user guide describes the EVAL-ADA4622-2ARZ evaluation board, which allows users to test the ADA4622-2 but can also be used for other dual, low bias current amplifiers that come in an 8-lead standard small outline package (SOIC_N). The design of this evaluation board emphasizes simplicity and ease of use. Provisions are available on the board to interface easily to test equipment.

The EVAL-ADA4622-2ARZ uses a combination of surfacemount technology (SMT) in Case Size 0603, with the exception of bypass capacitors and termination resistors. The EVAL-ADA4622-2ARZ evaluation board also features a variety of unpopulated resistor and capacitor pads that provide the user with multiple choices and extensive flexibility for different application circuits.

The evaluation board also has a provision for photodiode sensors, allowing easy configuration of a transimpedance amplifier (TIA). The layout is optimized with provisions for guarding to ensure low leakage and low parasitic capacitance for TIA applications.

Full specifications of the ADA4622-2 can be found in the ADA4622-2 data sheet, available from Analog Devices, which must be consulted in conjunction with this user guide when using the EVAL-ADA4622-2ARZ.

eval board
schematic 2
schematic 3
schematic 4
EVAL-OPAMP-2

EVAL-OPAMP-2 Evaluation Board

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Product Details

The universal precision op amp evaluation boards have been designed and optimized for many circuit configurations allowing the users to best suit their applications. These boards are all RoHs compliant. See references below on what board to order by lead count and package.

  • EVAL-PRAOPAMP-2CPZ (dual 8-lead LFCSP) CP-8
  • EVAL-PRAOPAMP-2RMZ (dual 8-lead MSOP) RM-8
  • EVAL-PRAOPAMP-2RZ (dual 8-lead SOIC) R-8
EVAL-ADA4622-2
ADA4622-2 Evaluation Board 
EVAL-ADA4622-2ARZ
EVAL-OPAMP-2
EVAL-OPAMP-2 Evaluation Board
EVAL-OPAMP-2 EVAL-OPAMP-2 EVAL-OPAMP-2

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