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AD745:  Ultralow Noise, High Speed, BiFET Op Amp

The AD745 is an ultralow noise, high speed, FET input operational amplifier. It offers both the ultralow voltage noise and high speed generally associated with bipolar input op amps and the very low input currents of FET input devices. Its 20 MHz bandwidth and 12.5 V/µs slew rate makes the AD745 an ideal amplifier for high speed applications demanding low noise and high dc precision. ...More

AD745:  Ultralow Noise, High Speed, BiFET Op Amp

Product Description

The AD745 is an ultralow noise, high speed, FET input operational amplifier. It offers both the ultralow voltage noise and high speed generally associated with bipolar input op amps and the very low input currents of FET input devices. Its 20 MHz bandwidth and 12.5 V/µs slew rate makes the AD745 an ideal amplifier for high speed applications demanding low noise and high dc precision. Furthermore, the AD745 does not exhibit an output phase reversal.

The AD745's guaranteed, tested maximum input voltage noise of 4 nV/(root)Hz at 10 kHz is unsurpassed for a FET-input monolithic op amp, as is its maximum 1.0 µV p-p noise in a 0.1 Hz to 10 Hz bandwidth. The AD745 also has excellent dc performance with 250 pA maximum input bias current and 0.5 mV maximum offset voltage.

The internal compensation of the AD745 is optimized for higher gains, providing a much higher bandwidth and a faster slew rate. This makes the AD745 especially useful as a preamplifier where low level signals require an amplifier that provides both high amplification and wide bandwidth at these higher gains. The AD745 is available in five performance grades. The AD745J and AD745K are rated over the commercial temperature range of 0°C to +70°C. The AD745A and AD745B are rated over the industrial temperature range of -40°C to +85°C. The AD745S is rated over the military temperature range of -55°C to +125°C and is available processed to MIL-STD-883B, Rev. C.

The AD745 is available in 8-pin plastic mini-DIP, 8-pin cerdip, 16-pin SOIC, or in chip form.

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  • ULTRALOW NOISE PERFORMANCE
    2.9 nV/√Hz at 10 kHz
    0.38 µV p-p, 0.1 Hz to 10 Hz
    6.9 fA/√Hz Current Noise at 1 kHz

  • EXCELLENT AC PERFORMANCE
    12.5 V/µs Slew Rate
    20 MHz Gain Bandwidth Product
    THD = 0.0002% @ 1 kHz
    Internally Compensated for Gains
    of +5 (or –4) or Greater
  • EXCELLENT DC PERFORMANCE
    0.5 mV Max Offset Voltage
    250 pA Max Input Bias Current
    2000 V/mV Min Open Loop Gain
    Available in Tape and Reel in
    Accordance with EIA-481A Standard
  • Iq per Amplifier: 10mA
  • # OpAmps per Pkg: 1
  • Operating Temp Range: 0 to +70
  • Packages: DIP,SOIC
  • -3dB Bandwidth: 20MHz
  • Slew Rate: 12.5V/µs
  • Vos: 250µV
  • Ib: 150pA
  • Input Noise (nV/rtHz): 2.9nV/rtHz
  • Vcc-Vee Supply (V): 9.6 to 36

Pin Configuration Diagram for AD745

AD745 Diagram
Pin Configuration Diagram for AD745

Similar Products

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Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
AD745 20MHz 12.5V/µs 250µV 150pA 2.9nV/rtHz 1 0 to +70
AD743 4.5MHz 2.8V/µs 250µV 150pA 2.9nV/rtHz 1 0 to +70
AD8651 50MHz 41V/µs 100µV 1pA 4.5nV/rtHz 1 -40 to +125
AD8610 25MHz 60V/µs 75µV 2pA 6nV/rtHz 1 -40 to +125
AD8067 54MHz 640V/µs 200µV 600fA 6.6nV/rtHz 1 -40 to +85
ADA4898-1 65MHz 55V/µs 20µV 100nA 900pV/rtHz 1 -40 to +105
AD8510 8MHz 20V/µs 80µV 21pA 7.6nV/rtHz 1 -40 to +85
AD797 8MHz 20V/µs 25µV 250nA 900pV/rtHz 1 -40 to +85
ADA4841-1 80MHz 13V/µs 40µV 3µA 2.1nV/rtHz 1 -40 to +125
ADA4000-1 5MHz 20V/µs 200µV 5pA 16nV/rtHz 1 -40 to +125
AD829 120MHz 230V/µs 200µV 3.3µA 1.7nV/rtHz 1 -55 to +125
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Model
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Status
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  • Pre-Release: The model has not been released to general production, but samples may be available.
  • Production: The model is currently being produced, and generally available for purchase and sampling.
  • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
  • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Production Availability
This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

View PCN
This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.