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LM1818N Folha de dados(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM1818N
Descrição Electrónicos  Electronically Switched Audio Tape System
Download  14 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1818N Folha de dados(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
TLH7894 – 9
FIGURE 7 Auto Level-Meter Circuit
METER DRIVINGMOTIONAL PEAK LEVEL
RESPONSE
(Figure 7)
The meter drive output (pin 8) is capable of supplying 1 – 2
mA at a filtered DC voltage that is typically equal to 10 times
the RMS value of the signal applied to the ALC-meter drive
input (pin 4) The RC network connected to pin 7 of the IC
determines the memory constant of the meter circuit It is
therefore possible to store the peak input signal by giving
this RC network a long time constant or read the instanta-
neous signal level by giving this RC network a very short
time constant (ie no capacitor) This memory capacitor is
discharged within the integrated circuit at a discharge rate
related to the DC level on the meter output pin When the
meter output pin is between 0 VDC and 07 VDC there is a
50 mA discharge current when the pin is between 07V and
11V there is no internal discharge current and when the
voltage on pin 8 is greater than 11V there is a discharge
equivalent to a 33k resistor across the memory capacitor
These different discharge rates allow the meter circuit to
display fast accurate responses on the lower portion of the
meter display slow responses in the higher portion of the
meter display and rapid discharge when the voltage is
above the maximum reading the meter can display The re-
sistor in series with the meter can be adjusted such that the
previously mentioned responses coincide with the proper
points (0 VU and a3 VU) on the meter scale
8


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