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LT1260CN Datasheet(PDF) 8 Page - Linear Technology |
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LT1260CN Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1259/LT1260 Enable/Disable The LT1259/LT1260 amplifiers have a unique high imped- ance, zero supply current mode which is controlled by independent EN pins. When disabled, an amplifier output The input slew rate of the LT1259/LT1260 is approxi- mately 270V/ µs and is set by internal currents and capaci- tances. The output slew rate is set by the value of the feedback resistors and internal capacitances. At a gain of 10 with at 1k feedback resistor and ±15V supplies, the output slew rate is typically 1600V/ µs. Larger feedback resistors will reduce the slew rate as will lower supply voltages, similar to the way the bandwidth is reduced. The graph of Maximum Undistorted Output vs Frequency relates the slew rate limitations to sinusoidal input for various gains. looks like a 4.4pF capacitor in parallel with a 75k resistor, excluding feedback resistor effects. These amplifiers are designed to operate with open drain logic: the EN pins have internal pullups and the amplifiers draw zero current when these pins are high. To activate an amplifier, its EN pin is pulled to ground (or at least 2V below the positive supply). The enable pin current is approximately 60 µA when activated. Input referred switching transients with no input signal applied are only 35mV positive and 80mV negative with RL = 100Ω. Amplifier Enable Time, AV = 10 VS = ±5V VIN = 0.1V LT1259/LT1260 • AI04 RF = 1k RG = 110Ω RL = 150Ω The enable/disable times are very fast when driven from standard 5V logic. The amplifier enables in about 100ns (50% point to 50% point) while operating on ±5V sup- plies. Likewise the disable time is approximately 40ns (50% point to 50% point) or 75ns to 90% of the final value. The output decay time is set by the output capaci- tance and load resistor. Large-Signal Transient Response, AV = 2 VS = ±15V RF = RG = 1.6k LT1259/LT1260 • AI01 RL = 400Ω Large-Signal Transient Response, AV = 10 VS = ±15V RF = 1k LT1259/LT1260 • AI02 RG = 110Ω RL = 400Ω OUTPUT EN VS = ±5V VIN = 0V Output Switching Transient LT1259/LT1260 • AI03 RF = RG = 1.6k RL = 100Ω OUTPUT EN APPLICATIO S I FOR ATIO |
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