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LT1014DMEP Datasheet(PDF) 11 Page - Texas Instruments |
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LT1014DMEP Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page APPLICATION INFORMATION SINGLE-SUPPLY OPERATION (a) VI(PP) = −1.5 V to 4.5 V (b) Output Phase Reversal Exhibited by LM358 (c) No Phase Reversal Exhibited by LT1014 5 4 3 2 1 0 −1 −2 5 4 3 2 1 0 −1 5 4 3 2 1 0 −1 LT1014D-EP www.ti.com ........................................................................................................................................................................................... SLOS609 – DECEMBER 2008 The LT1014D is fully specified for single-supply operation (VCC- = 0). The common-mode input voltage range includes ground, and the output swings within a few millivolts of ground. Furthermore, the LT1014D has specific circuitry that addresses the difficulties of single-supply operation, both at the input and at the output. At the input, the driving signal can fall below 0 V, either inadvertently or on a transient basis. If the input is more than a few hundred millivolts below ground, the LT1014D is designed to deal with the following two problems that can occur: 1. On many other operational amplifiers, when the input is more than a diode drop below ground, unlimited current flows from the substrate (VCC- terminal) to the input, which can destroy the unit. On the LT1014D, the 400- Ω resistors in series with the input (see schematic) protect the device even when the input is 5 V below ground. 2. When the input is more than 400 mV below ground (at TA = 25°C), the input stage of similar type operational amplifiers saturates, and phase reversal occurs at the output. This can cause lockup in servo systems. Because of unique phase-reversal protection circuitry (Q21, Q22, Q27, and Q28), the LT1014D outputs do not reverse, even when the inputs are at -1.5 V (see Figure 25). However, this phase-reversal protection circuitry does not function when the other operational amplifier on the LT1014D is driven hard into negative saturation at the output. Phase-reversal protection does not work on an amplifier: • When 4's output is in negative saturation (the outputs of 2 and 3 have no effect) • When 3's output is in negative saturation (the outputs of 1 and 4 have no effect) • When 2's output is in negative saturation (the outputs of 1 and 4 have no effect) • When 1's output is in negative saturation (the outputs of 2 and 3 have no effect) At the output, other single-supply designs either cannot swing to within 600 mV of ground or cannot sink more than a few microproamperes while swinging to ground. The all-npn output stage of the LT1014D maintains its low output resistance and high gain characteristics until the output is saturated. In dual-supply operations, the output stage is free of crossover distortion. Figure 25. Voltage-Follower Response With Input Exceeding the Negative Common-Mode Input Voltage Range Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): LT1014D-EP |
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