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Teilenummer | LA1140 |
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Beschreibung | FM IF System for Car Radio | |
Hersteller | Sanyo Semicon Device | |
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Gesamt 15 Seiten 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
LA1140
Resistance between pins 7 and 13, R7-13 – Ω
f = 10.7 MHz,
non-modulation
VCC = 8 V
Quadrature signal, V11 – dBµ
Ambient temperature, Ta – °C
VCC = 8 V, f = 10.7 MHz
Non-modulation
Ambient temperature, Ta – °C
VCC = 8 V, f = 10.7 MHz
Non-modulation
Ambient temperature, Ta – °C
VCC = 8 V, VIN = 100 dBµ
Non-modulation
ICCO (quiescent)
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No. 729-6/15
6 Page LA1140
. Variations of muting characteristics with a resistor
connected between pin 5 and GND varied.
(Adjustment of the maximum muting attenuation)
R5 – GND = 200k
Demodulation output
Noise
ANT input – dBµ
ANT input – dBµ
Unit (resistance: Ω, capacitance: F)
Sample Application Circuit 2
High Frequency Section of Car Radio and Car Stereo with Noise Canceller and FM Stereo Multiplexer
Almost all noise under a medium and lower input signal strength can be rejected by processing the muting characteristic of the
LA1140, the stereo noise control (SNC) characteristic and the high cut control characteristic of the LA3370. These examples are
as follows:
Front
end
Sample application of LA1140, LA3370
No. 729-12/15
12 Page | ||
Seiten | Gesamt 15 Seiten | |
PDF Download | [ LA1140 Schematic.PDF ] |
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