SANYO LA1143 Datasheet
LA1143
Ordering number : EN1140D
FM IF System for Car Radios
Monolithic Linear IC
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
91297HA (KT)/D157KI/2126KI/5085MW/D142KI, TS No.1140-1/5
Overview
The LA1143 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.
Functions
• IF amplification/limiter • Quadrature detector
• AF preamplifier • AFC output
• Signal meter output • AGC output
• Muting at detuning • Muting at small input
Package Dimensions
unit: mm
3006B-DIP16
[LA1143]
SANYO: DIP16
Features
1. Versatile mutings
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 40dB.
c) Input signal strength level which actuates the muting circuit can be set freely.
2. High limiting sensitivity (25 dBµ typ. with muting off) provides a good quieting characteristic.
3. High S/N (78dB typ.)
4. Low distortion (0.05% typ.) available, if used with double-tuned circuits.
5. Good AMR (63dB with 6 stages of differential IF amplifiers).
6. Signal meter drive output proportional to the input signal strength in dB (suitable to control multiplex IC LA3373).
7. Clamped (±VBE) AFC output, bandwidth adjustable.
8. Delayed AGC output for front end circuit.
Equivalent Circuit Block Diagram
Specifications
Maximum Ratings
at Ta=25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max Pin 12 16 V
Maximum supply current I
CC
max Pin 12 40 mA
Allowable power dissipation Pd max Ta=25°C 640 mW
Ta=70°C 460 mW
Input voltage V
IN
Pin 1 to 2 ±1 Vp-p
Flow-in current I
2
Pin 2 ±0.2 mA
I
3
Pin 3 ±0.2 mA
I
6
Pin 6 2 mA
Flow-out current I
5
Pin 5 1 mA
I
13
Pin 13 2 mA
I
14
Pin 14 2 mA
I
15
Pin 15 1 mA
I
16
Pin 16 1 mA
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +125 °C
Operating Condition at Ta=25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
8 V
Operating voltage range V
CC
op 7.5 to 16 V
Operating Characteristics at Ta=25°C, V
CC
=8V, f=10.7MHz, See specified Test Circuit.
Parameter Symbol Conditions
Ratings
min typ max
Unit
Quiescent current I
CCO
Quiescent 15 21 27 mA
Current drain I
CC
VIN=100dBµ 20 25 30 mA
Demodulation output V
O
VIN=100dBµ,400Hz, 100% mod. 200 260 320 mVrms
Total harmonic distortion THD V
IN
=100dBµ,400Hz, 100% mod. 0.05 0.2 %
Signal to noise ratio S/N V
IN
=100dBµ,400Hz, 100% mod. 72 78 dB
Input limiting voltage V
IN
(lim) VO: 3dB down, 400Hz 100% mod. 25 29 dBµ
Muting sensitivity V
IN
(mute) V14=2.0V 22 26 35 dBµ
Muting attenuation (1) Mute(ACC) V
6
=2.0V (22kΩ), VIN=100dBµ, 10 15 20 dB
400Hz 100% mod.
Muting attenuation (2) Mute(ACC) V
6
=5.0V (22kΩ), VIN=100dBµ, 24 28 32 dB
400Hz 100% mod.
Muting bandwidth BW(mute) V
IN
=100dBµ, V14=2.0V 140 210 370 kHz
AM rejection ratio AMR V
IN
=100dBµ, FM 400Hz 100% mod. 50 63 dB
AM 1kHz 30% mod.
Muting drive output V
14-0
Quiescent 3.5 4.2 5.0 V
Muting drive output V
14-100
VIN=100dBµ 0 0 0.3 V
Signal meter output (1) V
15-0
Quiescent 0 0.1 0.3 V
Signal meter output (2) V
15-50
VIN=50dBµ 0.8 1.4 2.0 V
Signal meter output (3) V
15-70
VIN=70dBµ 1.6 2.4 3.2 V
Signal meter output (4) V
15-100
VIN=100dBµ 4.5 5.3 6.0 V
AGC output (1) V
16-0
Quiescent 3.5 4.1 4.5 V
AGC output (2) V
16-100
VIN=100dBµ 0 0.02 0.3 V
Offset voltage (1) V
7-13
Quiescent, pin 7 to 13 –0.25 0 +0.25 V
Offset voltage (2) V
8-13
Quiescent, pin 8 to 13 –0.5 0 +0.5 V
LA1143
No.1140-2/5
Loading...