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PDF LA1140 Datasheet ( Hoja de datos )

Número de pieza LA1140
Descripción FM IF System for Car Radio
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo

Total 15 Páginas
		
LA1140 Hoja de datos, Descripción, Manual
Ordering number: EN 729E
Monalithic Linear IC
LA1140
FM IF System for Car Radio
Overview
The LA1140 is an IF system IC designed for FM car stereo
receivers. It features versatile muting characteristics and allows
receiver designers to realize the muting performance according
to their design concept. Since the muting characteristics can be
varied with a switch or a semi-fixed resistor, DX-Local
switching will be accomplished with ease.
Package Dimensions
unit : mm
3020A-SIP16
[LA1140]
Functions
. IF amplification/limiter
. Quadrature detector
. AF preamplifier
. AFC output
. Signal meter output
. AGC output
. Muting bandwidth
. Muting under weak signal strength
SANYO : SIP16
Features
. Versatile muting
a) When muting operation is performed under a weak signal
strength, an attenuation slope of the audio output against
the input signal strength variations can be set at any given
value.
b) Maximum muting attenuation can be selected to be
approximately 6 to 40 dB.
c) Input signal strength level which actuates the muting
. circuit can be set freely.
High limiting sensitivity (25 dBµ typ. with muting off)
provides a fine quieting characteristic.
. High S/N (78 dB typ.)
. Low distortion (0.05% typ.) avaiable if used with
. double-tuned circuits.
Good AMR (63 dB typ. with 6 stages of differential IF
. amplifiers).
Signal meter drive output proportional to the input signal
strength in dB (suitable to control multiplex IC LA3370).
. Clamped (±VBE) AFC output, bandwidth adjustable.
. Delayed AGC output for front end circuit.
. Small space factor due to single-ended package employed.
. 3 mm pitch of pin terminals permitting ease-to-write PC
board pattern.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA(II)/D0994JN/N257TA/4105MW/3233KI,TS O090KI No.729-1/15

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LA1140 datasheet

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LA1140 pdf
R15-G higher
ANT Input
Muting by varying R15-G
R14-6 lower
ANT Input
Muting by varying R14-6
LA1140
Ambient temperature, Ta – °C
f = 10.7 MHz, non-modulation
Noise
Input voltage, VIN (pin 1) – dBµ
Muting = OFF
Input voltage, VIN (pin 1) – dBµ
VCC = 8 V
Resistance
between pin 5 and
GND is 100 k
Resistance between pin 5 and GND –
fO = 10.7 MHz
VIN = 100 dBµ
Pins 7 – 13 = 5.1 k
V6 through 22 k– V
1 Tuned, muting OFF
2 – 200 kHz detuned, muting OFF
3 – 200 kHz detuned, muting ON
Frequency detuned, f – kHz
Input voltage, VIN (Pin 1) – dBµ
No. 729-5/15

5 Page

LA1140 arduino
LA1140
. Variation of muting characteristics with a resistor
connected between pin 15 and GND varied.
(Slope adjustment 1 of the curve for muting
attenuation vs. antenna signal input level)
Mute
OFF
Mute
ON
R15 – GND = 22 k
Adjustment output
Noise
ANT input – dBµ
ANT input – dBµ
. Variations of muting characteristics with a resistor
connected between pins 14 and 6 varied.
(Slope adjustment 2 of the curve for muting
attenuation vs. antenna signal input level)
Unit (resistance: , capacitance: F)
Mute
OFF
Demodulation output
Mute
ON
Noise
ANT input – dBµ
ANT input – dBµ
Unit (resistance: , capacitance: F)
No. 729-11/15

11 Page





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