The AD846 is a monolithic, very high speed operational amplifier offering high performance. Although technically classed as a current-feedback or transimpedance amplifier, it may be used in much the same way as traditional op amps while providing significant performance benefits. Employing Analog Devices’ junction isolated complementary bipolar (CB) process, the AD846 achieves true “12-bit” (0.01%) precision on critical ac and dc parameters, a level of performance unmatched by amplifiers fabricated using either the dielectrically isolated (DI) or other bipolar processes.
The AD846 offers significant advantages over conventional high speed operational amplifiers. It maintains a nearly constant bandwidth and settling time to 0.01% over a wide range of closed-loop gains. This makes the AD846 ideal for amplifying the residue in multiple-pass analog-to-digital converters.
FEATURES
AC PERFORMANCE
Small Signal Bandwidth: 80 MHz (AV = –1)
Slew Rate: 450 V/μs
Full Power Bandwidth: 6.8 MHz at 20 V p-p, RL = 500 Ω
Fast Settling: for 10 V Step: 110 ns to 0.01%, 80 ns to 0.1%
Differential Gain: <0.01% @ 4.4 MHz
Differential Phase: <0.028° @ 4.4 MHz
Total Harmonic Distortion (THD): 0.0005% @ 100 kHz
Open-Loop Transimpedance: 200 MΩ
Input Voltage Noise: 2 nV/√Hz
DC PERFORMANCE
Input Offset Voltage: 75 μV max (B Grade)
Input Offset Drift: 3.5 μV/°C max (B Grade)
Quiescent Supply Current: 6.5 mA max
APPLICATIONS
High Speed DAC Buffers
Multiflash ADC Error Amplifiers
Flash ADC Buffers
Coaxial Cable Drivers
High Performance Audio Circuitry
Available in Plastic Mini-DIP, Hermetic Cerdip, and Plastic SOIC (A) Package
