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. 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
    • Amplifiers
    AD745 SPICE Macro-Model
    Data Sheets
    Documentnote
    AD745: Ultralow Noise, High Speed, BiFET Op Amp Data Sheet (Rev. D)PDF 338 kB
    Application Notes
    Documentnote
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D)PDF 199 kB
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)PDF 5.3 M
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD745JR-16 Production16 ld SOIC - WideOTH 470 to 70C7.316.97N
    AD745JRZ-16 Production16 ld SOIC - WideOTH 470 to 70C6.175.86Y
    AD745JRZ-16-REEL Production16 ld SOIC - WideREEL 10000 to 70C05.86Y
    AD745JRZ-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C6.175.86Y
    AD745KR-16 Production16 ld SOIC - WideOTH 470 to 70C9.959.45N
    AD745KR-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C9.959.45N
    AD745KRZ-16 Production16 ld SOIC - WideOTH 470 to 70C8.397.96Y
    AD745KRZ-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C8.397.96Y
    AD745: Ultralow Noise, High Speed, BiFET Op Amp Data Sheet (Rev. D) ad745
    AD745 SPICE Macro-Model Rev. B, 10/95 ad745
    AD745A SPICE Macro-Model Rev. B, 10/95 ad745
    AD745B SPICE Macro-Model Rev. B, 10/95 ad745
    AD745J SPICE Macro-Model Rev. B, 10/95 ad745
    AD745K SPICE Macro-Model Rev. B, 10/95 ad745
    AD745S SPICE Macro-Model Rev. B, 10/95 ad745
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D) ad8628
    AN-940: 低噪声放大器选择指南 (Rev. A) ad8628
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350
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