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TLC271CDR Datasheet(PDF) 3 Page - Texas Instruments |
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TLC271CDR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 82 page TLC271, TLC271A, TLC271B LinCMOS PROGRAMMABLE LOW-POWER OPERATIONAL AMPLIFIERS SLOS090D – NOVEMBER 1987 – REVISED MARCH 2001 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 bias selection Bias selection is achieved by connecting the bias select pin to one of three voltage levels (see Figure 1). For medium-bias applications, it is recommended that the bias select pin be connected to the midpoint between the supply rails. This procedure is simple in split-supply applications, since this point is ground. In single-supply applications, the medium-bias mode necessitates using a voltage divider as indicated in Figure 1. The use of large-value resistors in the voltage divider reduces the current drain of the divider from the supply line. However, large-value resistors used in conjunction with a large-value capacitor require significant time to charge up to the supply midpoint after the supply is switched on. A voltage other than the midpoint can be used if it is within the voltages specified in Figure 1. VDD 1 M Ω 1 M Ω 0.01 µF Low Medium High To the Bias Select Pin BIAS MODE BIAS-SELECT VOLTAGE (single supply) Low Medium High VDD 1 V to VDD – 1 V GND Figure 1. Bias Selection for Single-Supply Applications high-bias mode In the high-bias mode, the TLC271 series features low offset voltage drift, high input impedance, and low noise. Speed in this mode approaches that of BiFET devices but at only a fraction of the power dissipation. Unity-gain bandwidth is typically greater than 1 MHz. medium-bias mode The TLC271 in the medium-bias mode features low offset voltage drift, high input impedance, and low noise. Speed in this mode is similar to general-purpose bipolar devices but power dissipation is only a fraction of that consumed by bipolar devices. |
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