LT1311 Datasheet | Linear Technology

LT1311 Quad 12MHz, 145ns Settling Precision Current-to-Voltage Converter for Optical Disk Drives Features s s s s s s s s s s DESCRIPTION The LT ®1311 is a quad current-to-voltage converter designed for the demanding requirements of photo diode amplification. A new approach to current-to-voltage conversion provides excellent DC and AC performance without external DC trims or AC frequency pensation. The LT1311 is ideal for converting multiple photo diode currents to voltages and for general purpose matched inverting amplifier applications. The LT1311 contains four current feedback amplifiers, each with an internal 20k feedback resistor. A supply bypass capacitor is the only external ponent required to convert four signal currents to voltages. Unlike voltage feedback-based current-to-voltage converters that operate with only a specified value of input capacitance, the current feedback LT1311 settles cleanly with any input capacitance up to 50p F. Only in the most demanding applications will the LT1311 need to be mounted close to the photo diodes. , LTC and LT are registered trademarks of Linear Technology Corporation. Four plete Current-to-Voltage Converters 14-Lead Small Outline Package Accurate Gain: 20m V/µA, ±4% Low Offset Error: 250n A Max Low Offset Drift: 2.5n A/°C Max Fast Settling: 145ns to 0.1% for a 2V Step Wide Bandwidth: 12MHz Low Noise: 5p A/√Hz Low Quiescent Current: 11m A Max Wide Supply Range: ± 2V to ± 18V or 4V to 36V U APPLICATIONS s s s Optical Disk Drive Photo Diode Amplifiers Focus and Tracking Summing Amplifiers Color Scanners RGB Amplifiers Selectable Gain Amplifiers Matched Inverting Amplifiers TYPICAL APPLICATION Photo Diode Current-to-Voltage Converter VCC 10V 1 IN A 0.1µF 2 3 IN B 4 BIAS 5 IN C 6 9 7 IN D + - OUT D 8 - + + - LT1311 - + OUT C OUT B OUT A 14 13 12 CIN = 1p F CIN = 20p F 5V 11 CIN = 50p F INPUT = 100µA STEP VS = ± 5V 1311 TA01 Transient Response 1311...