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PDF LM3189 Data sheet ( Hoja de datos )
| Número de pieza | LM3189 | |
| Descripción | LM3189 FM IF System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3189 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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April 1987
LM3189 FM IF System
General Description
The LM3189N is a monolithic integrated circuit that provides
all the functions of a comprehensive FM IF system The
block diagram of the LM3189N includes a three stage FM IF
amplifier limiter configuration with level detectors for each
stage a doubly balanced quadrature FM detector and an
audio amplifier that features the optional use of a muting
(squelch) circuit
The advanced circuit design of the IF system includes desir-
able deluxe features such as programmable delayed AGC
for the RF tuner an AFC drive circuit and an output signal
to drive a tuning meter and or provide stereo switching log-
ic In addition internal power supply regulators maintain a
nearly constant current drain over the voltage supply range
of a8 5V to a16V
The LM3189N is ideal for high fidelity operation Distortion
in an LM3189N FM IF system is primarily a function of the
phase linearity characteristic of the outboard detector coil
The LM3189N has all the features of the LM3089N plus
additions
The LM3189N utilizes the 16-lead dual-in-line plastic pack-
age and can operate over the ambient temperature range of
b40 C to a85 C
Features
Y Exceptional limiting sensitivity 12 mV typ at b3 dB
point
Y Low distortion 0 1% typ (with double-tuned coil)
Y Single-coil tuning capability
Y Improved (S a N) N ratio
Y Externally programmable recovered audio level
Y Provides specific signal for control of inter-channel mut-
ing (squelch)
Y Provides specific signal for direct drive of a tuning me-
ter
Y On channel step for search control
Y Provides programmable AGC voltage for RF amplifier
Y Provides a specific circuit for flexible audio output
Y Internal supply voltage regulators
Y Externally programmable ON channel step width and
deviation at which muting occurs
Block Diagram
All resistance values are in X
L tunes with 100 pF (C) at 10 7 MHz Q0 j 75
(Toko No KACS K586HM or equivalent)
C1995 National Semiconductor Corporation TL H 7960
TL H 7960 – 1
RRD-B30M115 Printed in U S A
1 page  
Typical Performance Characteristics
AM Rejection (30% Mod) vs
IF Input Signal
Mute Control Output
(Pin 12) vs IF Input Signal
Typical Audio Attenuation
(Pin 6) vs Mute Input
Voltage (Pin 5)
Muting Action Tuner AGC and Tuning
Meter Output as a Function
of Input Signal Voltage
AFC Characteristics (Current
at Term 7 as a Function
of Change in Frequency)
Deviation Mute Threshold as
a Function of Load Resistance
(Between Term 7 and Term 10)
Typical Limiting and Noise
Characteristics
TL H 7960 – 7
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM3189.PDF ] | |
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