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LT1077 Datasheet(PDF) 10 Page - Linear Technology |
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LT1077 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1077 1077fa APPLICATIO S I FOR ATIO resistors.) When the output is high the pull-down resistor draws 80µA which dominates the micropower current budget. This situation is much worse in the gain of one circuit with V–=0V. At 100V common mode, the output has to sink 2µA. At a minimum output voltage of 20mV competing devices require a 10k pull-down resistor. As the output now swings to 10V, this resistor draws 1mA of current. Since the output of the LT1077 cannot go exactly to ground, but can only approach ground to within a few millivolts, care should be exercised to ensure that the output is not saturated. For example, a 1mV input signal will cause the amplifier to set up in its linear region in the gain 100 configuration shown below; however, it is not enough to make the amplifier function properly in the voltage follower mode. Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V) Single supply operation can also create difficulties at the input. The driving signal can fall below 0V—inadvertently or on a transient basis. If the input is more than a few hundred millivolts below ground, two distinct problems can occur on previous single supply designs, such as the LM124, LM158, OP-20, OP-21, OP-220, OP-221, OP-420 (a and b), OP-90/290/490 (b only): a) When the input is more than a diode drop below ground, unlimited current will flow from the substrate (V – terminal) to the input (this can destroy the unit). On the LT1077, resistors in series with the input protect the device even when the input is 5V below ground. b) When the input is more than 400mV below ground (at 25°C), the input stage saturates and phase reversal occurs at the output (this can cause lock-up in servo systems). Due to a unique phase reversal protection circuitry, the LT1077’s output does not reverse, as illustrated below, even when the input is at – 1.0V. 100mV 1mV 99R 5V R + – OUTPUT SATURATED ≈ 3.5mV 1mV 5V + – LT1077 • AI01 Gain 100 Amplifier Voltage Follower 1ms/DIV 2V 1ms/DIV 2V 2V 4V 4V 4V 0 0 0 LT1077 NO PHASE REVERSAL OP-90 EXHIBITS OUTPUT PHASE REVERSAL 1ms/DIV 6VP-P INPUT –1.0 TO 5.0V |
Similar Part No. - LT1077_1 |
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Similar Description - LT1077_1 |
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