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LM1865 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM1865
Descripción Electrónicos  Advanced FM IF System
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1865 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Typical Application
LAYOUT CONSIDERATIONS
Although the pinout of the LM1865 has been chosen to min-
imize layout problems some care is required to insure sta-
bility The ground terminal on CF1 should return to both
the input signal ground and the buffer ground pin 19 The
ground terminal on CF2 should return to the ground side of
C4 The quadrature coil T1 and inductor L1 should be sepa-
rated from the input circuitry as far as possible
PC Layout (Component Side)
TLH7509 – 6
PERFORMANCE CHARACTERISTICS OF TYPICAL
APPLICATION WITH TUNER
The following data was taken using the typical application
circuit in conjunction with an FM tuner with 43 dB of gain a
55 dB noise figure and 30 dB of AGC range The tuner was
driven from a 50X source 75 ms of de-emphasis was used
on the audio output pin 15 The 0 dB reference is for g75
kHz deviation at 400 Hz modulation
Meter Output and
Signal-to-Noise
vs Tuner Input
Total Harmonic Distortion vs
Tuner Input
AM Rejection vs Tuner
Input
TLH7509 – 7
b
3 dB limiting e 09 mV
30 dB quieting e 14 mV
Level stopmute threshold e 14 mV
Deviation mute window (b3 dB) e g45 kHz
6


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