概述
数据手册0232-702-067 概述
FM IF SYSTEM FOR CAR RADIO 调频中频系统用于汽车收音机
0232-702-067 数据手册
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PDF下载Ordering number: EN 729E
Monalithic Linear IC
LA1140
FM IF System for Car Radio
Overview
Package Dimensions
unit : mm
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.
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
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
16
Unit
V
Maximum supply voltage
Maximum supply current
V
max
Pin 12
Pin 12
Ta = 25°C
Ta = 70°C
Pin 1 to 2
Pin 2
CC
I
max
40
mA
mW
mW
Vp-p
mA
mA
mA
mA
mA
mA
mA
mA
°C
CC
Allowable power
dissipation
Pd max
640
460
Input voltage
V
±1
IN
I2
Flow-in current
±0.2
I3
I6
Pin 3
±0.2
Pin 6
2
Flow-out current
I5
Pin 5
1
I13
I14
I15
I16
Topr
Tstg
Pin 13
Pin 14
Pin 15
Pin 16
2
2
1
1
Operating temperature
Storage temperature
–20 to +70
–40 to +125
°C
Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
8
Unit
V
Recommended supply
voltage
V
CC
Operating voltage range
V
op
7.5 to 16
V
CC
Operating Characteristics at Ta = 25°C, VCC = 8 V, f = 10.7 MHz, See specified Test Circuit
Parameter
Quiescent current
Symbol
Conditions
min
15
typ
21
max
27
30
Unit
mA
mA
I
Quiescent
CCO
Current drain
I
V
V
V
V
= 100 dBµ
20
25
260
0.05
78
CC
IN
IN
IN
IN
Demodulation output
Total harmonic distortion
Signal-to-noise ratio
Input limiting voltage
Muting sensitivity
V
= 100 dBµ, 400 Hz 100% mod.
= 100 dBµ, 400 Hz 100% mod.
= 100 dBµ, 400 Hz 100% mod.
200
320 mVrms
O
THD
S/N
0.2
%
72
dB
V
(lim)
V : 3 dB down, 400 Hz 100% mod.
25
29
32
dBµ
dBµ
IN
O
V
(Mute) V14 = 2.0 V
22
10
26
IN
V6 = 2.0 V (22 kΩ), V = 100 dBµ,
IN
Muting attenuation (1)
Mute (A
)
)
15
20
dB
CC
400 Hz 100% mod.
V6 = 5.0 V (22 kΩ), V = 100 dBµ,
IN
Muting attenuation (2)
Muting bandwidth
AM rejection ratio
Mute (A
24
140
50
28
210
63
32
dB
kHz
dB
CC
400 Hz 100% mod.
BW (Mute)
AMR
V
V
= 100 dBµ, V14 = 2.0 V
= 100 dBµ, FM 400 Hz
100% mod., AM 1 kHz 30% mod.
370
IN
IN
Muting drive output
Muting drive output
Signal meter output (1)
Signal meter output (2)
Signal meter output (3)
Signal meter output (4)
AGC output (1)
V14-0
V14-100
V15-0
Quiescent
3.5
0
4.2
0
5.0
0.3
V
V
V
V
V
V
V
V
V
V
V
= 100 dBµ
IN
Quiescent
0
0.1
1.4
2.4
5.3
4.1
0.02
0
0.3
V15-50
V15-70
V15-100
V16-0
V
V
V
= 50 dBµ
= 70 dBµ
= 100 dBµ
0.8
1.6
4.5
3.5
0
2.0
IN
IN
IN
3.2
6.0
Quiescent
= 100 dBµ
4.5
AGC output (2)
V16-100
V7-13
V
0.3
IN
Offset voltage (1)
Quiescent, pin 7 to 13
Quiescent, pin 8 to 13
–0.25
–0.5
+0.25
+0.5
Offset voltage (2)
V8-13
0
No. 729-2/15
LA1140
Equivalent Circuit Block Diagram
AC Test Circuit
T1: CBTKAC-24782 AUO (Toko Co.)
T2: CBTKAE-24783X (Toko Co.)
22µH: S-220J (Korin Co.)
Input signal strength is an actual input at pin 1
Signal
strength
Ind.
Unit (resistance: Ω, capacitance: F)
Muting Characteristic
The muting operation in the LA1140 is performed by an AF preamplifier, the gain of which varies continuously with control
current, and a muting drive output circuit which supplies the control current.
The gain of the AF preamplifier decreases with increasing gain control current applied to pin 6. However, the gain does not
decrease further when the control current reaches approximately 120 µA or greater. The lower limit of the gain under this
condition depends upon a resistor connected between pin 5 and GND, and the higher the resistance the lower the gain (the higher
the attenuation). Thus the maximum muting attenuation will be set by connecting the resistor between pin 5 and GND.
output
R5-G (lower) 20 kΩ
R5-G (higher) 100 kΩ
No. 729-3/15
LA1140
Since the muting control input pin 6 is connected to the base of the emitter grounded transistor (through a protection resistor of
500 Ω in series), the voltage between pin 6 and GND is about 0.6 V when the control current is applied. In actual cases, the
muting operation is accomplished by applying a voltage drive type muting drive output (pin 14 to pin 6 through a high resistance
(up to 20 kΩ)).
The muting drive output comes in three types:
1) Hole detector output which develops a voltage when C/N (carrier-to-noise
ratio) lowers under weak signal input conditions.
2) A reversed output of the signal strength indicating output (output at pin
15)
3) A bandwidth limited muting drive output which develops a voltage when
Unit (resistance: Ω)
the AFC output becomes higher than ±VBE during tuning-off operation.
All these outputs are led to an OR circuit and the processed output is developed at pin 14. Of the above muting drive outputs,
descriptions on the hole detector output and the bandwidth limited muting drive output will be omitted, since they are the same as
those used in conventional quadrature detector ICs (such as LA1230, LA1231N).
The inverted output of the signal strength indication output is obtained as illustrated below.
Inverter
Inverter
Inverter
(Offset)
(Muting drive output)
(AGC output)
(Signal meter output)
By referring to the illustration, V14 is given by the formula: V14 = Vr – (IO + I1 – aI2)RL – VBE
.
Conditions are: Vr 4.9 V, IO 0.2 mA, a 2, RL = 22 kΩ, VBE 0.6 V, I1 = V15/R15-G, I2 = V16/R16-G where V16 is a
constant equal to 4.1 V (typ) for medium or lower signal input levels, where the muting drive output is required. Since the V15
increases proportionally to the increase of the input signal strength, I1 will also increase. Therefore the V14 will decrease with
increasing signal strength. Thus the required muting drive output can be obtained by selecting proper values of R15-G and R16-G.
For example, the muting drive output moves toward strong input signal level
if the R16-G is decreased, or the muting drive output becomes zero due to the
offset current IO under a weak signal input condition, if the R16-G is
increased to infinity (namely pin 16 is opened). However the muting drive
output caused by a whole detector still exists in this case. Increasing R15-G
decreases the slope of the curve for the muting drive output vs. antenna signal
input level, or decreasing the R15-G increases the slope of the curve.
Furthermore, varying the value of a resistor connected between the muting
drive output (pin 14) and the muting control input (pin 6) changes the value of
ANT Input
the muting control current required to obtain the same muting drive output,
accordingly the slope of the curve for muting attenuation vs. antenna signal
input level is also changed. These characteristics investigated by using an
actual receiver are shown on the curves below.
The general method to adjust the muting circuit of the LA1140 is: to set the signal input level required to actuate the muting
circuit with the R16-G, to adjust the slope of the curve for the muting attenuation vs. antenna signal input with the R15-G, and to
adjust the maximum muting attenuation (determined by setting the noise level at no signal) with the R5-G. The slope of the curve
for the muting attenuation vs. antenna signal input level can also be adjusted by the resistor connected between pins 14 and 6 in
addition to R15-G, however, selecting a resistor too high does not allow the muting control current flowing into pin 6 to reach
120 µA even through the maximum muting drive output (V14) is applied, namely the muting attenuation does not reach its
maximum value. Accordingly a recommended value of the resistor between pins 14 and 6 is about 22 kΩ.
No. 729-4/15
LA1140
R15-G higher
ANT Input
Muting by varying R15-G
R14-6 lower
ANT Input
Muting by varying R14-6
Ambient temperature, Ta – °C
f = 10.7 MHz, non-modulation
Noise
Input voltage, VIN (pin 1) – dBµ
Input voltage, VIN (pin 1) – dBµ
V
= 8 V
CC
Resistance
Muting = OFF
between pin 5 and
GND is 100 kΩ
V6 through 22 kΩ – V
1 Tuned, muting OFF
Resistance between pin 5 and GND – Ω
2 – 200 kHz detuned, muting OFF
3 – 200 kHz detuned, muting ON
f
= 10.7 MHz
IN
O
V
= 100 dBµ
Pins 7 – 13 = 5.1 kΩ
Frequency detuned, ∆f – kHz
Input voltage, VIN (Pin 1) – dBµ
No. 729-5/15
LA1140
f = 10.7 MHz,
non-modulation
V
= 8 V
CC
Quadrature signal, V11 – dBµ
Resistance between pins 7 and 13, R7-13 – Ω
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
V
= 8 V, f = 10.7 MHz
V
= 8 V, f = 10.7 MHz
CC
CC
Non-modulation
Non-modulation
ICCO (quiescent)
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
V
= 8 V, V = 100 dBµ
IN
CC
Non-modulation
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No. 729-6/15
LA1140
V
= 8 V, f = 10.7 MHz
CC
Non-modulation
V
= 8 V
CC
f = 10.7 MHz
Quiescent
Non-modulation
Quiescent
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
V
= 8 V, f = 10.7 MHz
CC
Non-modulation
Quiescent
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
= 100 dBµ, non-modulation
V
IN
V7 to 13 = 0
Supply voltage, VCC – V
Supply voltage, VCC – V
f = 10.7 MHz
Non-modulation
Supply voltage, VCC – V
Supply voltage, VCC – V
No. 729-7/15
LA1140
Supply voltage, VCC – V
Supply voltage, VCC – V
V
= 100 dBµ
IN
Non-modulation
Supply voltage, VCC – V
Supply voltage, VCC – V
f = 10.7 MHz
Non-modulation
Quiescent
f = 10.7 MHz
Non-modulation
I
(quiescent)
CCO
Supply voltage, VCC – V
Supply voltage, VCC – V
f = 10.7 MHz
Non-modulation
f = 10.7 MHz
Non-modulation
Quiescent
Quiescent
Supply voltage, VCC – V
Supply voltage, VCC – V
No. 729-8/15
LA1140
Proper cares in using LA1140
1) The detector transformers should be designed to develop a quadrature signal (pin 11) of higher than 175 mVrms
(approximately 105 dBµ) under high antenna signal input. If the quadrature signal strength is less than 125 mVrms, the
muting drive output (V14) cannot decrease to zero even in a strong signal strength. Furthermore, when the quadrature signal
strength lies between 125 mV and 175 mV, the muting drive output may move from zero to plus under high temperature
conditions.
2) When designing a PC board, special care should be given to the ground pattern layout by referring to that of the recommend
PC board example as shown below.
3) Do not connect a capacitor directly between pin 16 and ground. If the signal intensity of IF input varies in the vicinity of
90 dBµ, the voltage at pin 16 varies. Thus, charging/discharging current flows into the capacitor and goes to the muting drive
output (pin 14) through the inverter inside the IC, thereby causing the muting to malfunction.
Sample Application Circuit 1
TOKO
higher
[Maximum Att. Adj.]
lower
[Muting ON level Adj.]
[Slope Adj.]
[Slope Adj.]
Unit (resistance: Ω, capacitance: F)
No. 729-9/15
LA1140
Sample Printed Circuit Pattern
(Cu-foiled side 45 × 75 mm2)
.
Variations of muting characteristics with a resistor
connected between pin 16 and GND varied.
(Muting threshold level adjustment)
Demodulation
output
Mute
OFF
Mute
ON
Noise
ANT Input – dBµ
ANT Input – dBµ
No. 729-10/15
LA1140
R
– GND = 22 k
15
Adjustment output
.
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
Noise
ANT input – dBµ
Unit (resistance: Ω, capacitance: F)
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)
Demodulation output
Mute
OFF
Mute
ON
Noise
ANT input – dBµ
Unit (resistance: Ω, capacitance: F)
ANT input – dBµ
No. 729-11/15
LA1140
.
R5 – GND = 200k
Demodulation output
Variations of muting characteristics with a resistor
connected between pin 5 and GND varied.
(Adjustment of the maximum muting attenuation)
Noise
ANT input – dBµ
Unit (resistance: Ω, capacitance: F)
ANT input – dBµ
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
LA1140
Circuit Diagram
Oscilloscope
Pilot cancel
Ceramic oscillator
Unit (resistance: Ω, capacitance: F)
No. 729-13/15
LA1140
SNC Characteristic VO, NO – ANT IN
Signal Meter Output V15 – ANT IN
Stereo
Monaural
ANT input – dBµ
ANT input – dBµ
HCC Characteristics VO – ANT IN
Hcc OFF, monaural
Hcc
ON
ANT input – dBµ
Overall muting characteristic by SNC, HCC
ANT input – dBµ
Frequency characteristic of demodulation output by HCC
Muting
Stereo
Monaural
ANT input
= 10 dBµ
ANT input – dBµ
Modulation frequency – Hz
Signal meter output
Separation
ANT input – dBµ
No. 729-14/15
LA1140
Item
Manufacturer
Toko
Type Number
Package
Fixed
Inductor
Damping
Resistor
Note
Double tuning
Pri. CBTKAC-24782AUO
Sec. CBTKAE-24783X
10 mm sq.
10 mm sq.
22 µH
22 µH
10 kΩ
2.7 kΩ
Sumida
Toko
Pri. 0232-702-066
Sec. 0232-702-067
7 mm sq.
7 mm sq.
10 kΩ
2.7 kΩ
Single tuning
119AC-14086Z
MTKAC-25639Z
7 mm sq.
10 mm sq.
22 µH
22 µH
10 kΩ
10 kΩ
Korin
57-1011-01
59-1167-04
7 mm sq.
10 mm sq.
22 µH
(22 µH*)
22 kΩ
5.6 kΩ
*:Included
*:Included
Sumida
Sankyo
24M-190-268
24M-190-267
7 mm sq.
10 mm sq.
22 µH
22 µH
5.6 kΩ
5.6 kΩ
DC-11
7 mm sq.
(22 µH*)
10 kΩ
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like,
the failure of which may directly or indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation
and all damages, cost and expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or
implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of September, 1997. Specifications and information herein are subject to change without notice.
No. 729-15/15
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