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LT6015/LT6016/LT6017

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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 LT6015/LT6016/

LT6017 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 distortion

canbeachievedwiththeLT6015/LT6016/LT6017sourcing

in class-A operation in an inverting configuration, with the

inputcommonmodebiasedmid-waybetweenthesupplies.

Power Dissipation Considerations

Because of the ability of the LT6015/LT6016/LT6017 to

operate on power supplies up to ±25V and to drive heavy

loads, there is a need to ensure the die junction tempera-

ture does not exceed 150°C. The LT6015 is housed in a

5-lead TSOT-23 package (JA = 250°C/W). The LT6016

is housed in an 8-lead MSOP package (JA = 273°C/W).

The LT6017 is housed in a 22 pin leadless DFN package

(DJC22, JA = 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 • JA

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

±25Vsupplieswithbothamplifierssimultaneouslydriving

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-

nelsoftheLT6017quadwhichhaslowerthermalresistance

JA=31.8°C/W,andanexposedpadwhichmaybesoldered

down to a copper plane (connected to V–) to further lower

the thermal resistance below JA = 31.8°C/W.

applicaTions inForMaTion

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