AD845 Precision, 16 MHz CBFET Op Amp

The AD845 is a fast, precise, N channel JFET input, monolithic operational amplifier. It is fabricated using Analog Devices' complementary bipolar (CB) process. Advanced laser-wafer trimming technology enables the very low input offset voltage and offset voltage drift performance to be realized. This precision, when coupled with a slew rate of 100 V/µs, a stable unity-gain bandwidth of 16 MHz, and a settling time of 350 ns 0.01%-while driving a parallel load of 100 pF and 500 Ohm- represents a combination of features unmatched by any FET input IC amplifier. The AD845 can easily be used to upgrade many existing designs which use BiFET or FET input hybrid amplifiers and, in some cases, those which use bipolar input op amps.

The AD845 is ideal for use in applications such as active filters, high speed integrators, photo diode preamps, sample-and-hold amplifiers, log amplifiers, and in buffering A/D and D/A converters. The 250 µV max input offset voltage makes offset nulling unnecessary in many applications. The common-mode rejection ratio of 110 dB over a ±10 V input voltage range represents exceptional performance for a JFET input high speed op amp. This, together with a minimum open-loop gain of 250 V/mV ensures that 12-bit performance is achieved, even in unity-gain buffer circuits.

The AD845 conforms to the standard op amp pinout except that offset nulling is to V+. The AD845J and AD845K grade devices are available specified to operate over the commercial 0°C to +70°C temperature range. AD845A and AD845B devices are specified for operation over the -40°C to +85°C industrial temperature range. The AD845S is specified to operate over the full military temperature range of -55°C to +125°C. Both the industrial and military versions are available in 8-pin cerdip packages. The commercial version is available in an 8-pin plastic mini-DIP and 16-pin SOIC; "J" and "S" grade chips are also available.

Features and Benefits
  • Replaces Hybrid Amplifiers in Many Applications
    AC Performance
  • Settles to 0.01% in 350 ns
  • 100 V/µs Slew Rate
  • 12.8 MHz Min Unity Gain Bandwidth
  • 1.75 MHz Full Power Bandwidth at 20 V p-p
    DC Performance
  • 0.25 mV Max Input Offset Voltage
  • 5 µV/°C Max Offset Voltage Drift
  • 0.5 nA Input Bias Current
  • 250 V/mV Min Open-Loop Gain
  • 4 µV p-p Max Voltage Noise, 0.1 Hz to 10 Hz
  • 94 dB Min CMRR
  • Available in Plastic Mini-DIP, Hermetic CERDIP, and SOIC Packages. Also available in Tape and Reel in Accordance with EIA-481A Standard
    • Amplifiers
    AD845 SPICE Macro-Model
    Data Sheets
    Documentnote
    AD845: Precision, 16 MHz CBFET Op Amp Data Sheet (Rev. E)PDF 211 kB
    AD845: Military Data Sheet
    Application Notes
    Documentnote
    AN-402: Replacing Output Clamping Op Amps with Input Clamping AmpsPDF 55 kB
    AN-581: Biasing and Decoupling Op Amps in Single Supply Applications (Rev. 0)PDF 166 kB
    AN-417: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed SystemsPDF 228 kB
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    5962-8964501PA Production8 ld CerDIPOTH 48-55 to 125C50.5845.73N
    AD845AQ Production8 ld CerDIPOTH 48-40 to 85C10.689.07N
    AD845BQ Production8 ld CerDIPOTH 48-40 to 85C14.9712.7N
    AD845JCHIPS ProductionCHIPS OR DIEREEL 1300 to 70C09.87Y
    AD845JN Production8 ld PDIPOTH 500 to 70C7.015.94N
    AD845JNZ Production8 ld PDIPOTH 500 to 70C6.385.42Y
    AD845JRZ-16 Production16 ld SOIC - WideOTH 470 to 70C5.935.03Y
    AD845JRZ-16-REEL Production16 ld SOIC - WideREEL 10000 to 70C05.03Y
    AD845JRZ-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C05.03Y
    AD845KNZ Production8 ld PDIPOTH 500 to 70C7.386.27Y
    AD845SQ Production8 ld CerDIPOTH 48-55 to 125C25.4124.14N
    AD845SQ/883B Production8 ld CerDIPOTH 48-55 to 125C45.9741.37N
    Reference Materials
    AD845: Precision, 16 MHz CBFET Op Amp Data Sheet (Rev. E) ad845
    AD845 SPICE Macro-Model Rev. A, 12/90 ad845
    AD845A SPICE Macro-Model Rev. A, 12/90 ad845
    AD845B SPICE Macro-Model Rev. A, 12/90 ad845
    AD845J SPICE Macro-Model Rev. A, 12/90 ad845
    AD845K SPICE Macro-Model Rev. A, 12/90 ad845
    AD845S SPICE Macro-Model Rev. A, 12/90 ad845
    AD845: Military Data Sheet ad845
    AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps ad829
    AN-581: Biasing and Decoupling Op Amps in Single Supply Applications (Rev. 0) ad829
    AN-417: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems ad829
    AN-402: 以输入箝位放大器取代输出箝位运算放大器 (Rev. 0) ad829
    AN-417: 在低压高速系统中利用快速轨到轨运算放大器减少设计限制 (Rev. 0) ad829
    AN-581: 单电源应用中的偏置和去耦运算放大器 (Rev. 0) ad829
    MT-060: Choosing Between Voltage Feedback and Current Feedback Op Amps ad829
    MT-032：理想的电压反馈型(VFB)运算放大器 ad829
    MT-059: 补偿输入电容对电流电压转换器所用电压反馈和电流反馈型运算放大器的影响 ad9631
    MT-058: 反馈电容对VFB和CFB运算放大器的影响 ad829
    MT-056: 高速电压反馈运算放大器 ad829
    MT-053:运算放大器失真：HD、THD、THD + N、IMD、SFDR、MTPR ad829
    MT-052：运算放大器噪声指数：不要被误导 ad829
    MT-050: 二阶系统的运算放大器总输出噪声计算 ad9631
    MT-049：单极点系统的运算放大器总输出噪声计算 ad829
    MT-048：运算放大器噪声关系：1/f噪声、均方根(RMS)噪声与等效噪声带宽 ad829
    MT-047：运算放大器噪声 ad829
    MT-033：电压反馈型运算放大器的增益和带宽 ad829
    MT-032: Ideal Voltage Feedback (VFB) Op Amp ad829
    CN-0042: Driving the AD7366/AD7367 Bipolar SAR ADC in Low-Distortion DC-Coupled ad7366
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