The LT1228 makes it easy to electronically control the gain of signals from DC to video frequencies. The LT1228 implements gain control with a transconductance amplifier (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, the gain-controlled amplifier can be implemented with the LT1228 and just a few resistors. The LT1228 transconductance amplifier has a high impedance differential input and a current source output with wide output voltage compliance.
LT1228 Pinout
LT1228 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | I OUT | Output Current Pin |
| 2 | INV-IN | Inverting Input Pin |
| 3 | NON-INV-IN | Non-Inverting Input Pin |
| 4 | I SET | Input Offset Current Pin |
| 5 | V- | Negative Voltage Pin |
| 6 | VOUT | Output Voltage Pin |
| 7 | V+ | Positive Voltage Pin |
| 8 | GAIN | Gain Pin |
LT1228 Key Features
- 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
Application
- Video DC Restore (Clamp) Circuits
- Video Differential Input Amplifiers
- Video Keyer/Fader Amplifiers
- AGC Amplifiers
- Tunable Filters
- Oscillators
You can download this datasheet for LT1228 100MHz Current Feedback Amplifier – Datasheet from the link given below:
