LT1228CS8 Datasheet

100MHz Current Feedback Amplifier with DC Gain Control


The LT1228CS8 makes it easy to electronically control the gain of signals from DC to video frequencies. The LT1228CS8 implements gain control with a transconductance ampli- fier(voltage to current) whose gain is proportional to an externally controlled current. A resistor is typically used to convert the output current to a voltage, which is then amplified with a current feedback amplifier. The LT1228CS8 combines both amplifiers into an8-pin package, and oper- ates on any supply voltage from4V(±2V) to30V(±15V). A complete differential input, gain controlled amplifier can be implemented with the LT1228 and just a few resistors. LT1228CS8 Features • Very Fast Transconductance Amplifier Bandwidth: 75MHz gm= 10 × ISET Low THD: 0.2% at30mVRMS Input Wide ISET Range: 1µA to1mA• Very Fast Current Feedback Amplifier Bandwidth: 100MHz Slew Rate: 1000V/µs Output Drive Current: 30mA Differential Gain: 0.04% Differential Phase: 0.1° High Input Impedance: 25MΩ, 6pF• Wide Supply Range: ±2V to±15V• Inputs Common Mode to Within1.5V of Supplies• Outputs Swing Within0.8V of Supplies• Supply Current: 7mA• Available in8-Lead PDIP and SO Packages LT1228CS8 Applications • Video DC Restore(Clamp) Circuits• Video Differential Input Amplifiers• Video Keyer/Fader Amplifiers• AGC Amplifiers• Tunable Filters• Oscillators


[{"Name":"Slew Rate ","Value":"3500 V/μs"},{"Name":"-3db Bandwidth ","Value":"100MHz"},{"Name":"Current - Input Bias ","Value":"10μA"},{"Name":"Voltage - Input Offset ","Value":"3mV"},{"Name":"Current - Supply ","Value":"6mA"},{"Name":"Current - Output / Channel ","Value":"125mA"},{"Name":"Voltage - Supply, Single/Dual (±) ","Value":"4 V ~ 36 V, ±2 V ~ 18 V"},{"Name":"Operating Temperature ","Value":"0°C ~ 70°C"},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information


Diodes Incorporated is a leading global manufacturer and supplier of high-quality, application-specific, standard products within the broad discrete, logic and analog semiconductor markets. Diodes Incorporated primarily serves the computing, consumer, communications, industrial and automotive segments. Diodes’ diverse product portfolio includes parts for LCD/LED TVs and displays, desktop, notebook and tablet computing, smartphones and hand-held devices, set-top boxes, power supplies and USB protection as well as many other application areas.

Diodes Incorporated offers a wide array of products including diodes, rectifiers, transistors, MOSFETs, gate drivers, protection devices, function-specific arrays, amplifiers and comparators, Hall-effect sensors and temperature sensors, power management devices including LED drivers, AC-DC converters and controllers, DC-DC switching regulators, linear voltage regulators, current monitors, and voltage reference and shunt regulators, along with special function devices including USB power switches, load switch devices, voltage supervisors and motor controllers.

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