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TLC27L2BCDRG4 Datasheet(PDF) 28 Page - Texas Instruments |
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TLC27L2BCDRG4 Datasheet(HTML) 28 Page - Texas Instruments |
28 / 50 page TLC27L2, TLC27L2A, TLC27L2B, TLC27L7 LinCMOS PRECISION DUAL OPERATIONAL AMPLIFIERS SLOS052D − OCTOBER 1987 − REVISED OCTOBER 2005 28 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION output characteristics (continued) (b) CL = 260 pF, RL = NO LOAD (a) CL = 20 pF, RL = NO LOAD VI − 2.5 V CL VO 2.5 V TA = 25°C f = 1 kHz VI(PP) = 1 V (d) TEST CIRCUIT (c) CL = 310 pF, RL = NO LOAD Figure 41. Effect of Capacitive Loads and Test Circuit Although the TLC27L2 and TLC27L7 possess excellent high-level output voltage and current capability, methods for boosting this capability are available, if needed. The simplest method involves the use of a pullup resistor (RP) connected from the output to the positive supply rail (see Figure 42). There are two disadvantages to the use of this circuit. First, the NMOS pulldown transistor N4 (see equivalent schematic) must sink a comparatively large amount of current. In this circuit, N4 behaves like a linear resistor with an on-resistance between approximately 60 Ω and 180 Ω, depending on how hard the operational amplifier input is driven. With very low values of RP, a voltage offset from 0 V at the output occurs. Second, pullup resistor RP acts as a drain load to N4 and the gain of the operational amplifier is reduced at output voltage levels where N5 is not supplying the output current. |
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