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LT1256 Datasheet(PDF) 1 Page - Linear Technology |
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LT1256 Datasheet(HTML) 1 Page - Linear Technology |
1 / 22 page LT1228 1 1228fd TYPICAL APPLICATION FEATURES DESCRIPTION 100MHz Current Feedback Amplifier with DC Gain Control The LT®1228 makes it easy to electronically control the gain of signals from DC to video frequencies. The LT1228 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 LT1228 combines both amplifiers into an 8-pin package, and oper- ates on any supply voltage from 4V (±2V) to 30V (±15V). A complete differential input, gain controlled amplifier can be implemented with the LT1228 and just a few resistors. TheLT1228transconductanceamplifierhasahighimped- ancedifferentialinputandacurrentsourceoutputwithwide output voltage compliance. The transconductance, gm, is setbythecurrentthatflowsintoPin5,ISET.Thesmallsignal gmisequaltotentimesthevalueofISETandthisrelationship holds over several decades of set current. The voltage at Pin 5 is two diode drops above the negative supply, Pin 4. The LT1228 current feedback amplifier has very high input impedanceandthereforeitisanexcellentbufferfortheout- putofthetransconductanceamplifier.Thecurrentfeedback amplifiermaintainsitswidebandwidthoverawiderangeof voltage gains making it easy to interface the transconduc- tance amplifier output to other circuitry. The current feed- back amplifier is designed to drive low impedance loads, suchascables,withexcellentlinearityathighfrequencies. APPLICATIONS n Very Fast Transconductance Amplifier Bandwidth: 75MHz gm = 10 × ISET Low THD: 0.2% at 30mVRMS Input Wide ISET Range: 1µA to 1mA n 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 n Wide Supply Range: ±2V to ±15V n Inputs Common Mode to Within 1.5V of Supplies n Outputs Swing Within 0.8V of Supplies n Supply Current: 7mA n Available in 8-Lead PDIP and SO Packages n Video DC Restore (Clamp) Circuits n Video Differential Input Amplifiers n Video Keyer/Fader Amplifiers n AGC Amplifiers n Tunable Filters n Oscillators L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LT1228 • TA01 – + – + + R3A 10k R2A 10k R3 100Ω R2 100Ω 4.7µF R4 1.24k R6 6.19k R5 10k ISET R1 270Ω RG 10Ω RF 470Ω 4.7µF 15V gm CFA VOUT 1 8 6 3 2 7 5 4 –15V + – VIN HIGH INPUT RESISTANCE EVEN WHEN POWER IS OFF –18dB < GAIN < 2dB VIN ≤ 3VRMS FREQUENCY (Hz) 100k –24 –15 –3 3 6 1M 10M 100M LT1228 • TA02 0 –6 –9 –12 –18 –21 ISET = 100µA VS = ±15V RL = 100 ISET = 1mA ISET = 300µA Differential Input Variable Gain Amp Frequency Response |
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