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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LT1228CS8 데이터시트(PDF) 1 Page - Linear Technology |
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LT1228CS8 데이터시트(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LT1228 1228fc ■ Video DC Restore (Clamp) Circuits ■ Video Differential Input Amplifiers ■ Video Keyer/Fader Amplifiers ■ AGC Amplifiers ■ Tunable Filters ■ Oscillators 100MHz Current Feedback Amplifier with DC Gain Control ■ Very Fast Transconductance Amplifier Bandwidth: 75MHz gm = 10 × ISET Low THD: 0.2% at 30mVRMS Input Wide ISET Range: 1µA to 1mA ■ 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: 25M Ω, 6pF ■ Wide Supply Range: ±2V to ±15V ■ Inputs Common Mode to Within 1.5V of Supplies ■ Outputs Swing Within 0.8V of Supplies ■ Supply Current: 7mA ■ Available in 8-Lead PDIP and SOIC Packages 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 operates 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. The LT1228 transconductance amplifier has a high imped- ance differential input and a current source output with wide output voltage compliance. The transconductance, gm, is set by the current that flows into Pin 5, ISET. The small signal gm is equal to ten times the value of ISETand this relationship 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 impedance and therefore it is an excellent buffer for the output of the transconductance amplifier. The current feed- back amplifier maintains its wide bandwidth over a wide range of voltage gains making it easy to interface the transconductance amplifier output to other circuitry. The current feedback amplifier is designed to drive low imped- ance loads, such as cables, with excellent linearity at high frequencies. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Frequency Response FREQUENCY (Hz) 100k –24 –15 –3 3 6 1M 10M 100M LT1228 • TA02 0 –6 –9 –12 –18 –21 ISET = 100µA VS = ±15V RL = 100Ω ISET = 1mA ISET = 300µA LT1228 • TA01 – + – + + R3A 10k R2A 10k R3 100 Ω R2 100 Ω 4.7 µF R4 1.24k R6 6.19k R5 10k ISET R1 270 Ω RG 10 Ω RF 470 Ω 4.7 µF 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 Differential Input Variable Gain Amp , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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