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LT1673 Datasheet(PDF) 8 Page - Linear Technology |
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LT1673 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1672/LT1673/LT1674 Start-Up Characteristics Micropower op amps are sometimes not micropower during start-up, wreaking havoc on low current supplies. In the worst case, there may not be enough supply current available to take the system up to nominal voltages. Figure 1 is a graph of LT1673 supply current vs supply voltage for the three limit cases of input offset that could occur during start-up. The circuits are shown in Figure 2. One circuit creates a positive offset, forcing the output to come up saturated high. Another circuit creates a negative offset, forcing the output to come up saturated low, while the last brings up the output at half supply. In all cases, the supply current is well behaved. Supply current is highest with the output forced high, so if one amplifier is unused, it is best to force the output low or at half supply. APPLICATIO S I FOR ATIO TOTAL SUPPLY VOLTAGE (V) 0 5 4 3 2 1 0 4 1672/3/4 FO1 1 2 3 5 OUTPUT VS/2 OUTPUT HIGH OUTPUT LOW Figure 1. Start-Up Characteristics 16/2/3/4 F02 OUTPUT HIGH V+ V– V– V– V+ V+ – + OUTPUT AT VS/2 – + OUTPUT LOW – + 820k 200k Figure 2. Circuits for Start-Up Characteristics Reverse Battery The LT1672/LT1673/LT1674 are protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is typically less than 100nA (inputs grounded and outputs open). For typical single supply applications with ground referred loads and feedback networks, no other precautions are required. If the reverse battery condition results in a negative voltage at either the input pins or output pin, the current into the pin should be limited by an external resistor to less than 10mA. Inputs While the LT1672/LT1673/LT1674 will function normally with its inputs taken above the positive supply, the com- mon mode range does not extend beyond approximately 300mV below the negative supply at room temperature. Small-Signal Response Small-Signal Response Large-Signal Response TYPICAL PERFORMANCE CHARACTERISTICS VS = ±15V CL = 100pF AV = 5 VS = 5V CL = 100pF AV = 5 VS = 5V CL = 100pF AV = 5 1672/3/4 G19 1672/3/4 G20 1672/3/4 G21 |
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