These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage. They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. 

 LF353 - Wide Bandwidth Dual JFET Input Operational Amplifier

• Gain Bandwidth 4 MHz
• Slew Rate 13 Volts/usec
• Offset Voltage 10 mV
• Low Input Bias Current: 50pA
• High Input Impedance: 1 Tera Ohms

Understanding IC Operational Amplifiers Roger Melen and Harry Garland

This book explains how IC op amps work and how they can be used in many practical circuits. In this book the explanation of how IC op amps work is developed from the fundamental concepts of semiconductor electronics. Once this information is clearly understood, these versatile devices can be used in many new and exciting applications.