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TSX631 데이터시트(PDF) 20 Page - STMicroelectronics

부품명 TSX631
상세설명  Micropower (45 μA, 200 kHz) rail-to-rail 16 V CMOS operational amplifiers
PDF  31 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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TSX631 데이터시트(HTML) 20 Page - STMicroelectronics

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Application information
TSX63x, TSX63xA
20/31
DocID024293 Rev 1
Equation 5
To evaluate the op-amp reliability, a follower stress condition is used where VCC is defined
as a function of the maximum operating voltage and the absolute maximum rating (as
recommended by JEDEC rules).
The Vio drift (in µV) of the product after 1000 h of stress is tracked with parameters at
different measurement conditions (see Equation 6).
Equation 6
The long term drift parameter (ΔVio), estimating the reliability performance of the product, is
obtained using the ratio of the Vio (input offset voltage value) drift over the square root of the
calculated number of months (Equation 7).
Equation 7
where Vio drift is the measured drift value in the specified test conditions after 1000 h stress
duration.
4.5
High values of input differential voltage
In closed loop configuration, which represents the typical use of an op-amp, the input
differential voltage is low (close to Vio). However, some specific conditions can lead to
higher input differential values, such as:
•
operation in an output saturation state
•
operation at speeds higher than the device bandwidth, with output voltage dynamics
limited by slew rate.
•
use of the amplifier in a comparator configuration, hence in open loop
Use of the TSX631 in comparator configuration, especially combined with high temperature
and long duration can create a permanent drift of Vio.
All channels of the dual and quad versions of the TSX632 and TSX634 are virtually
unaffected when used in comparator configuration.
4.6
PCB layouts
For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible
to the power supply pins.
Months
AF 1000 h
×
12 months
24 h
365.25 days
×
()
⁄
×
=
VCC
maxVop with Vicm
VCC 2
⁄
==
ΔVio
Viodrift
months
()
------------------------------
=



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