Micropower, Single Supply, Precision Op Amp

The LT1077 is a micropower precision operational amplifier optimized for single supply operation at 5V. In addition, ±15V specifications are provided.

Micropower performance of competing devices is achieved at the expense of seriously degrading precision, noise, speed, and output drive specifications. The LT1077 reduces supply current without sacrificing other parameters. The offset voltage achieved is the lowest of any micropower op amp. Offset current, voltage and current noise, slew rate and gain-bandwidth product are all two to ten times better than on previous micropower op amps.

The 1/f corner of the voltage noise spectrum is at 0.7Hz. This results in low frequency (0.1Hz to 10Hz) noise performance which can only be found on devices with anorder of magnitude higher supply current.

The LT1077 is completely plug-in compatible (including nulling) with all industry standard precision op amps. Thus, it can replace these precision op amps in many applications without sacrificing performance, yet with significant power savings.

The LT1077 can be operated from one lithium cell or two Ni-Cad batteries. The input range goes below ground. The all-NPN output stage swings to ground while sinking current—no pull-down resistors are needed.

For dual and quad op amps with similar specifications please see the LT1078/LT1079 datasheet.

Applications

* Replaces OP-07, OP-77, AD707, LT1001, LT1012 at 10 to 60 Times Lower Power

* Battery or Solar Powered Systems

* 4mA to 20mA Current Loops

* Two Terminal Current Source

* Megaohm Source Resistance Difference Amplifier

* 60µA Max Supply Current

* 40µV Max Offset Voltage

* 350pA Max Offset Current

* 0.5µVp-p 0.1Hz to 10Hz Voltage Noise

* 2.5pAp-p 0.1Hz to 10Hz Current Noise

* 0.4µV/°C Offset Voltage Drift

* 250kHz Gain-Bandwidth Product

* 0.12V/µs Slew Rate

* Single Supply Operation

* Input Voltage Range Includes Ground

* Output Swings to Ground while Sinking Current

* No Pull-Down Resistors are Needed

* Output Sources and Sinks 5mA Load Current