參數(shù)資料
型號: LPC662IN
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運算放大器
英文描述: Low Power CMOS Dual Operational Amplifier
中文描述: DUAL OP-AMP, 6300 uV OFFSET-MAX, 0.35 MHz BAND WIDTH, PDIP8
封裝: PLASTIC, DIP-8
文件頁數(shù): 10/16頁
文件大?。?/td> 585K
代理商: LPC662IN
Application Hints
(Continued)
BIAS CURRENT TESTING
The test method of Figure 7 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its op-
eration, first close switch S2 momentarily. When S2 is
opened, then
A suitable capacitor for C2 would be a 5 pF or 10 pF silver
mica, NPO ceramic, or air-dielectric. When determining the
magnitude of I
, the leakage of the capacitor and socket
must be taken into account. Switch S2 should be left shorted
most of the time, or else the dielectric absorption of the ca-
pacitor C2 could cause errors.
Similarly, if S1 is shorted momentarily (while leaving S2
shorted)
where C
x
is the stray capacitance at the + input.
Typical Single-Supply Applications
(V
+
= 5.0 V
DC
)
DS010548-24
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 6. Air Wiring
DS010548-25
FIGURE 7. Simple Input Bias Current Test Circuit
Photodiode Current-to-Voltage Converter
DS010548-17
A 5V bias on the photodiode can cut its capacitance by a factor of 2
Note:
Micropower Current Source
DS010548-18
(Upper limit of output range dictated by input common-mode range;
Note:
www.national.com
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