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LT2079I Datasheet(PDF) 11 Page - Linear Technology |
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LT2079I Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT 2078/LT 2079 APPLICATIONS INFORMATION 1. 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 LT2078/LT2079, resistors in series with the input protect the devices even when the input is 5V below ground. 2. 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 lockup in servo systems. Due to a unique phase reversal protection cir- cuitry, the LT2078/LT2079 output does not reverse, as illustrated in Figure 2, even when the inputs are at –1V. Distortion There are two main contributors of distortion in op amps: distortion caused by nonlinear common mode rejection and output crossover distortion as the output transitions from sourcing to sinking current. The common mode rejection of the LT2078/LT2079 is very good, typically 108dB. Therefore, as long as the input operates in the normal common mode range, there will be very little common mode induced distortion. If the op amp is oper- ating inverting there is no common mode induced distor- tion. Crossover distortion will increase as the output load resistance decreases. For the lowest distortion the LT2078/ LT2079 should be operated with the output always sourc- ing current, this is usually accomplished by putting a resistor from the output to V –. In an inverting configura- tion with no load, the output will source and sink current through the feedback resistor. High value feedback resis- tors will reduce crossover distortion and maintain micropower operation. Matching Specifications In many applications the performance of a system de- pends on the matching between two op amps, rather than Figure 2. Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V) 2V 0V 6VP-P INPUT 1ms/DIV –1V TO 5V LT2078/79 • F01a 1ms/DIV LT2078/LT2079 NO PHASE REVERSAL LT2078/79 • F01C 2V 0V 4V 1ms/DIV OP-90 EXHIBITS OUTPUT PHASE REVERSAL LT2078/79 • F01b 2V 0V 4V 4V Table 1 LT2078AC/LT2079AC/LT2078AI/LT2079AI LT2078C/LT2079C/LT2078I/LT2079I PARAMETER 50% YIELD 98% YIELD 50% YIELD 98% YIELD UNITS VOS Match, ∆VOS LT2078 30 110 50 190 µV LT2079 40 150 50 250 µV Temperature Coefficient ∆VOS 0.5 1.2 0.6 1.8 µV/°C Average Noninverting IB 6 8610 nA Match of Noninverting IB 0.12 0.4 0.15 0.5 nA CMRR Match 120 100 117 97 dB PSRR Match 117 105 117 102 dB |
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