LT1256 Datasheet | Linear Technology

LT1251/LT1256 40MHz Video Fader and DC Gain Controlled Amplifier Features s s s s s s s s DESCRIPTION The LT ®1251/LT1256 are 2-input, 1-output, 40MHz current feedback amplifiers with a linear control circuit that sets the amount each input contributes to the output. These parts make excellent electronically controlled variable gain amplifiers, filters, mixers and faders. The only external ponents required are the power supply bypass capacitors and the feedback resistors. Both parts operate on supplies from ± 2.5V (or single 5V) to ±15V (or single 30V). Absolute gain accuracy is trimmed at wafer sort to minimize part-to-part variations. The circuit is pletely temperature pensated. The LT1251 includes circuitry that eliminates the need for accurate control signals around zero and full scale. For control signals of less than 2% or greater than 98%, the LT1251 sets one input pletely off and the other pletely on. This is ideal for fader applications because it eliminates off-channel feedthrough due to offset or gain errors in the control signals. The LT1256 does not have this on/off feature and operates linearly over the plete control range. The LT1256 is remended for applications requiring more than 20d B of linear control range. s s s s Accurate Linear Gain Control: ± 1% Typ, ± 3% Max Constant Gain with Temperature Wide Bandwidth: 40MHz High Slew Rate: 300V/µs Fast Control Path: 10MHz Low Control Feedthrough: 2.5m V High Output Current: 40m A Low Output Noise 45n V/√Hz at AV = 1 270n V/√Hz at AV = 100 Low Distortion: 0.01% Wide Supply Range: ± 2.5V to ± 15V Low Supply Current: 13m A Low Differential Gain and Phase: 0.02%, 0.02° U APPLICATIONS s s s s s s s posite Video Gain Control RGB, YUV Video Gain Control Video Faders, Keyers Gamma Correction Amplifiers Audio Gain Control, Faders Multipliers, Modulators Electronically Tunable Filters , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION Two-Input...