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LT1112 数据表(PDF) 16 Page - Linear Technology |
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LT1112 数据表(HTML) 16 Page - Linear Technology |
16 / 22 page LT6016/LT6017 16 60167fa Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. If the op amp is operating in an inverting configuration there is no com- mon mode induced distortion. If the op amp is operating in the noninverting configuration within the normal input common mode range (V– to V+ –1.5V) the CMRR is very good, typically over 120dB. When the LT6016 transitions input stages going from the normal input stage to the Over-The-Top input stage or vice-versa, there will be a significant degradation in linearity due to the change in input circuitry. Lower load resistance increases distortion due to a net decrease in loop gain, and greater voltage swings internal to the amp necessary to drive the load, but has no effect on the input stage transition distortion. The lowest distor- tion can be achieved with the LT6016/LT6017 sourcing in class-A operation in an inverting configuration, with the input common mode biased mid-way between the supplies. Power Dissipation Considerations Because of the ability of the LT6016/LT6017 to operate on power supplies up to ±25V and to drive heavy loads, there is a need to ensure the die junction temperature does not exceed 150°C. The LT6016 is housed in an 8-lead MSOP package (θJA = 273°C/W). The LT6017 is housed in a 22 pin leadless DFN package (DJC22, θJA = 31.8°C/W). In general, the die junction temperature (TJ) can be esti- mated from the ambient temperature TA, and the device power dissipation PD: TJ = TA + PD • θJA The power dissipation in the IC is a function of supply voltage and load resistance. For a given supply voltage, the worst-case power dissipation PD(MAX) occurs at the maximum supply current with the output voltage at half of either supply voltage (or the maximum swing is less than one-half the supply voltage). PD(MAX) is given by: PD(MAX) = (VS • IS(MAX)) + (VS/2)2/RLOAD Example: An LT6016 in a MSOP package mounted on a PC board has a thermal resistance of 273°C/W. Operating on ±25V supplies with both amplifiers simultaneously driving 2.5kΩ loads, the worst-case IC power dissipation for the given load occurs when driving 12.5VPEAK and is given by: PD(MAX) = 2 • 50 • 0.6mA + 2 • (12.5)2/2500 = 0.185W With a thermal resistance of 273°C/W, the die temperature will experience approximately a 50°C rise above ambient. This implies the maximum ambient temperate the LT6016 should ever operate under the assumed conditions: TA = 150°C – 50°C = 100°C To operate to higher ambient temperatures, use two chan- nels of the LT6017 quad which has lower thermal resistance θJA=31.8°C/W,andanexposedpadwhichmaybesoldered down to a copper plane (connected to V–) to further lower the thermal resistance below θJA = 31.8°C/W. APPLICATIONS INFORMATION |
类似零件编号 - LT1112 |
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类似说明 - LT1112 |
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