AD849 General Description
The AD848 and AD849 are high speed, low power monolithic operational amplifiers. The AD848 is internally compensated so that it is stable for closed loop gains of 5 or greater. The AD849 is fully decompensated and is stable at gains greater than 24. The AD848 and AD849 achieve their combination of fast ac and good dc performance by utilizing Analog Devices' junction isolated complementary bipolar (CB) process. This process enables these op amps to achieve their high speed while only requiring 4.8 mA of current from the power supplies.
The AD848 and AD849 are members of Analog Devices' family of high speed op amps. This family includes, among others, the AD847 which is unity gain stable, with a gain bandwidth of 50 MHz. For more demanding applications, the AD840, AD841 and AD842 offer even greater precision and greater output current drive.
The AD848 and AD849 have good dc performance. When operating with ±5 V supplies, they offer open loop gains of 13 V/mV (AD848 with a 500 load) and low input offset voltage of 1 mV maximum. Common-mode rejection is a minimum of 92 dB. Output voltage swing is ±3 V even into loads as low as 150 .
AD849 Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation2
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts
Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 Watts
Cerdip (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts
LCC (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 Watts
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±6 V
Storage Temperature Range (Q) . . . . . . . . 65 to +150
(N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +125
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +175
Lead Temperature Range (Soldering 60 sec) . . . . . . . +300
NOTES
1Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2LCC: qJA = 150/Watt
Mini-DIP Package: qJA = 110/Watt
Cerdip Package: qJA = 110/Watt
Small Outline Package: qJA = 155/Watt.
AD849 Features
`725 MHz Gain Bandwidth AD849
`175 MHz Gain Bandwidth AD848
`4.8 mA Supply Current
`300 V/ms Slew Rate
`80 ns Settling Time to 0.1% for a 10 V Step AD849
`Differential Gain: AD848 = 0.07%, AD849 = 0.08%
`Differential Phase: AD848 = 0.08°, AD849 = 0.048
`Drives Capacitive Loads
AD849 Typical Application
·Cable Drivers
·8- and 10-Bit Data Acquisition Systems
·Video and RF Amplification
·Signal Generators
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