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LF400MH Arkusz danych(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LF400MH
Szczegółowy opis  Fast-Settling JFET-Input Operational Amplifier
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LF400MH Arkusz danych(HTML) 11 Page - National Semiconductor (TI)

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Application Hints (Continued)
TLH9414 – 24
FIGURE 4a Vos Adjust Circuit
TLH9414 – 25
FIGURE 4b Automatic Offset
Adjustment Using LMC669
In very critical applications where a manual adjustment is
impractical the LMC669 Auto Zero circuit may be used to
reduce the effective input offset voltage to around 5
mVas
in
Figure 4b The LF400 will perform better than slower am-
plifiers in an auto zero loop because its fast settling capabil-
ity keeps its summing node voltage more stable Therefore
the LMC669 is able to more accurately sample the summing
node voltage before making an offset correction
Input Bias Current
The JFET input stage of the LF400 ensures low input bias
current (200 pA maximum) when the die is at room tempera-
ture but this current approximately doubles for every 10 C
increase in temperature In applications that demand the
lowest possible input bias current a heat sink should be
used with the LF400 ‘‘Press on’’ heat sinks from manufac-
turers such as Thermalloy and AAVID can reduce junction
temperature by roughly 10 Cto40 C
Typical Applications
High-Speed DAC with Voltage Output
TLH9414 – 26
11


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