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LT6016 数据表(PDF) 16 Page - Linear Technology

部件名 LT6016
功能描述  Dual/Quad 3.2MHz, 0.8V/關s Low Power, Over-The-Top Precision Op Amp
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT6016 数据表(HTML) 16 Page - Linear Technology

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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 (Vto 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


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