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AD745:  Ultralow Noise, High Speed, BiFET Op Amp

Product Details


Newer Alternatives:
  • ADA4637-1 30 V, 80 MHz, Low Noise, Low Bias Current, JFET 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. 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.

FEATURES and BENEFITS

  • 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

Pin Configuration Diagram for AD745

AD745 Diagram
Pin Configuration Diagram for AD745

Documentation

Title Content Type File Type
AD745: Ultralow Noise, High Speed, BiFET Op Amp Data Sheet (Rev D, 01/2002) (pdf, 338 kB) Data Sheets PDF
AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance  (pdf, 199 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD745 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD745JR-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.77 $6.45 N  Material Info PCN Purchase
AD745JRZ-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $5.71 $5.43 Y  Material Info PCN Purchase
AD745JRZ-16-REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $5.43 Y  Material Info PCN Purchase
AD745JRZ-16-REEL7 Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 400 $5.71 $5.43 Y  Material Info PCN Purchase
AD745KR-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $9.21 $8.75 N  Material Info PCN Purchase
AD745KR-16-REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $8.75 N  Material Info PCN/PDN Purchase
AD745KR-16-REEL7 Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 400 $9.21 $8.75 N  Material Info PCN Purchase
AD745KRZ-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $7.77 $7.37 Y  Material Info PCN Purchase
AD745KRZ-16-REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $7.37 Y  Material Info PCN/PDN Purchase
AD745KRZ-16-REEL7 Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 400 $7.77 $7.37 Y  Material Info PCN Purchase
Price Table Help

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.


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