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LM1865 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM1865
Spiegazioni elettronici  Advanced FM IF System
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1865 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI)

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TLH7509
February 1995
LM1865 Advanced FM IF System
General Description
Reduced external component cost improved performance
and additonal functions are key features to the LM1865 FM
IF system The LM1865 is designed for use in electronically
tuned radio applications It contains both deviation and sig-
nal level stop circuitry in addition to an open-collector stop
output The LM1865 generates a reverse AGC voltage (ie
decreasing AGC voltage with increasing signal)
Features
Y
On-chip buffer to provide gain and terminate two ce-
ramic filters
Y
Low distortion 01% typical with a single tuned quadra-
ture coil for 100% modulation
Y
Broad off frequency distortion characteristic
Y
Low THD at minimum AFT offset
Y
Meter output proportional to signal level
Y
Stop detector with open-collector output
Y
Adjustable signal level mutestop threshold controlled
either by ultrasonic noise in the recovered audio or by
the meter output
Y
Adjustable deviation mutestop threshold
Y
Separate time constants for signal level and deviation
mutestop
Y
Dual threshold AGC eliminates need for localdistance
switch and offers improved immunity from third order in-
termodulation products due to tuner overload
Y
User control of both AGC thresholds
Y
Excellent signal to noise ratio AM rejection and system
limiting sensitivity
Block Diagram
Order Number LM1865M
or LM1865N
See NS Package Number
M20B or N20A
TLH7509 – 1
FIGURE 1
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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