LT1122 Fast Settling, JFET Input Operational Amplifier FEATURES DESCRIPTION n 100% Tested Settling Time 340ns Typ The LT 1122 JFET input operational amplifier combines to 1mV at Sum Node, 10V Step 540ns Max high speed and precision performance. Tested with Fixed Feedback Capacitor A unique poly-gate JFET process minimizes gate series n Slew Rate 60V/s Min resistance and gate-to-drain capacitance, facilitating wide n Gain-Bandwidth Product 14MHz bandwidth performance, without degrading JFET transis- n Power Bandwidth (20V) 1.2 MHz P-P tor matching. n Unity-Gain Stable Phase Margin 60 n It slews at 80V/s and settles in 340ns. The LT1122 is Input Offset Voltage 600V Max n internally compensated to be unity-gain stable, yet it has Input Bias Current 25C 75pA Max a bandwidth of 14MHz at a supply current of only 7mA. Its 70C 600pA Max speed makes the LT1122 an ideal choice for fast settling Input Offset Current 25C 40pA Max 12-bit data conversion and acquisition systems. 70C 150pA Max Low Distortion The LT1122 offset voltage of 120V, and voltage gain of 500,000 also support the 12-bit accurate applications. APPLICATIONS The input bias current of 10pA and offset current of 4pA combined with its speed allow the LT1122 to be used in n Fast 12-Bit D/A Output Amplifiers such applications as high speed sample and hold ampli- n High Speed Buffers fiers, peak detectors, and integrators. n Fast Sample-and-Hold Amplifiers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load n High Speed Integrators is a trademark of Linear Technology Corporation. All other trademarks are the property of their n respective owners. Voltage to Frequency Converters n Active Filters n Log Amplifiers n Peak Detectors TYPICAL APPLICATION 12-Bit Voltage Output D/A Converter Large-Scale Response + C F 2 6 V 0mA TO 2mA OUT LT1122 0V TO 10V OR 4mA + 3 12-BIT CURRENT OUTPUT D/A CONVERTER 1122 TA07 200ns/DIV C = 5pF TO 17pF F LT1122 TA01 A = 1 (DEPENDING ON D/A CONVERTER USED) V 1122fb 1 For more information www.linear.com/LT1122 5V/DIV LT1122 (Note 1) ABSOLUTE MAXIMUM RATINGS Supply Voltage ...................................................... 20V Operating Temperature Range Differential Input Voltage ....................................... 40V LT1122AM/BM/CM/DM (OBSOLETE) .. 55C to 125C Input Voltage .......................................................... 20V LT1122AC/BC/CC/DC/CS/DS .................40C to 85C Output Short Circuit Duration .......................... Indefinite Storage Temperature Range Lead Temperature (Soldering, 10 sec.) ..................300C All Devices .......................................... 65C to 150C PIN CONFIGURATION TOP VIEW V SPEED BOOST/ OS 1 TOP VIEW 8 TRIM OVERCOMP + V SPEED BOOST/ IN 2 7 OS V 1 8 TRIM OVERCOMP +IN + 3 6 OUT IN 2 7 V V 4 5 V TRIM OS +IN 3 6 OUT V 4 5 V TRIM N8 PACKAGE OS 8-LEAD PDIP S8 PACKAGE T = 150C, = 130C/W JMAX JA 8-LEAD PLASTIC SO OBSOLETE PACKAGE T = 150C, = 190C/W JMAX JA J8 PACKAGE 8-LEAD HERMETIC DIP T = 175C, = 100C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1122ACN8 PBF LT1122ACN8 TRPBF LT1122ACN8 8-Lead Plastic DIP 40C to 85C LT1122BCN8 PBF LT1122BCN8 TRPBF LT1122BCN8 8-Lead Plastic DIP 40C to 85C LT1122CCN8 PBF LT1122CCN8 TRPBF LT1122CCN8 8-Lead Plastic DIP 40C to 85C LT1122DCN8 PBF LT1122DCN8 TRPBF LT1122DCN8 8-Lead Plastic DIP 40C to 85C LT1122CS8 PBF LT1122CS8 TRPBF 1122C 8-Lead Plastic SO 40C to 85C LT1122DS8 PBF LT1122DS8 TRPBF 1122D 8-Lead Plastic SO 40C to 85C OBSOLETE PACKAGE LT1122AMJ8 PBF LT1122AMJ8 TRPBF LT1122AMJ8 8-Lead Hermetic DIP 55C to 125C LT1122BMJ8 PBF LT1122BMJ8 TRPBF LT1122BMJ8 8-Lead Hermetic DIP 55C to 125C LT1122CMJ8 PBF LT1122CMJ8 TRPBF LT1122CMJ8 8-Lead Hermetic DIP 55C to 125C LT1122DMJ8 PBF LT1122DMJ8 TRPBF LT1122DMJ8 8-Lead Hermetic DIP 55C to 125C LT1122ACJ8 PBF LT1122ACJ8 TRPBF LT1122ACJ8 8-Lead Hermetic DIP 40C to 85C LT1122BCJ8 PBF LT1122BCJ8 TRPBF LT1122BCJ8 8-Lead Hermetic DIP 40C to 85C LT1122CCJ8 PBF LT1122CCJ8 TRPBF LT1122CCJ8 8-Lead Hermetic DIP 40C to 85C LT1122DCJ8 PBF LT1122DCJ8 TRPBF LT1122DCJ8 8-Lead Hermetic DIP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part markings, go to: