Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
Monolithic Linear IC
VCO Non-Adjusting PLL FM MPX
Stereo Demodulator with FM Accessories
Ordering number:ENN1407F
LA3410
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21000TH (KT)/90196RM/33194HO/O096KI/8024KI, TS No.14071/13
Package Dimensions
unit:mm
3006B-DIP16
[LA3410]
SANYO : DIP16
Overview
The LA3410 is a multiplex demodulator IC designed for
FM stereo tuner. It features the VCO non-adjusting func-
tion that eliminates the need to adjust the free-running fre-
quency of VCO.
Applications
Home stereos, portable hi-fi sets.
Functions
VCO non-adjusting function.
PLL MPX stereo demodulator.
Gain variable type post amplifier.
VCO stop function.
Separation adjust function.
Features
Non-adjusting VCO : Eliminates the need to adjust the
free-running frequency.
Good temperature characteristic of VCO :
0.1% typ. for
50
C change.
Low distortion at high frequencies in stereo main channel
(0.06% at f=10kHz) (Non-adjusting PLL makes the cap-
ture range narrower, leading to improvement in beat dis-
tortion at high frequencies in stereo main channel.)
Low distortion : 1kHz 300mV input mono 0.025% typ.
main 0.02% typ.
High S/N : 91dB typ. (mono 300mV input, LPF).
92dB typ. (mono 300mV input, IHF BPF).
High voltage gain : Approximately 8.5dB (at standard
constants).
Wide dynamic range : Distortion 1.0% at mono 800mV,
1kHz input.
Good ripple rejection of power supply : 34dB typ.
1
8
16
9
3.0
3.4
3.65max
19.2
0.71
2.54
1.2
0.25
0.48
7.62
6.4
LA3410
No.14072/13
Specifications
Absolute Maximum Ratings
at Ta = 25C
C
C
Ta
60C
Operating Conditions
at Ta = 25C
Operating Characteristics
at Ta = 25C, V
CC
=12V, V
i
=300mV, f=1kHz, L+R=90%, pilot=10%
Note 1 : The output voltage on pin 4 or 7 is measured after separation adjust.
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LA3410
No.14073/13
Equivalent Circuit Block Diagram and Sample Application Circuit
* : Use a nonpolarized electrolytic capacitor or poly-
ester film capacitor in the VCO stop mode. If a
polarized electrolytic capacitor is used, refer to
"VCO Stop Method" shown below.
X : Murata
CSB456F11
Kyocera KBR-457HS
LPF L BL-13 (Korin Giken)
Note 1 :
Set the PLL loop filter constants (R8, C9, C10),
with the input pilot level considered, so that the
capture range becomes wide. (Refer to No. 4 or
Proper Cares in Using IC.)
Sample Printed Circuit Pattern
LA3410
No.14074/13
External Parts
Note 1 : IF C9, C10 are polarized capacitors, refer to "VCO Stop Method TM" shown below
Note 2 : For loop filter constants (C9, C10, R8), refer to 4. Capture range and PLL loop filter constants on page 5 and set
these constants to the optimum values for the input pilot level.
Voltage on Each Pin and Pin Name
Proper Cares in Using IC
1. VCO stop method
One of the following is used to stop VCO. The monaural mode is forced to be entered at the time of VCO stop.
(1) VCO stop method
(a) For loop filter capacitors (C9, C10 in Fig. 1), use one of the following.
(1) Non-polarized capacitor
(2) Polyester film capacitor
[Reason] When in the VCO stop mode, external voltage V
S
causes an
unpolarized voltage of approximately 1.5V to be developed
across pins 14 and 15.
(b) Setting of external voltage V
S
and limiting resistor R
S
.
The relation between V
S
and R
S
is shown in Fig. 9. When in the VCO stop mode, the value of R
S
must be set so
that the voltage on pin 11 is within the specified range (min=5.5V, max=V
CC
3V). For example, it is seen from
Fig. 9 that the value of limiting resistor R
S
is approximately 4.2k
when the voltage on pin 11 is set to 6V at
V
S
=12V.
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LA3410
No.14075/13
(2) VCO stop method TM
(a) Addition of diode (small-signal silicon diode)
Diode D1 is additionally connected across pins 11 and 15 as shown in
Fig. 2. In this case, the use of nonpolarized capacitors for C9, C10 across
pins 14 and 15 involves no problem (pin 15 : + polarity).
(Note) When D1 is connected across pins 11 and 14, stereo start time may
be 2 to 3 seconds late as compared with the application in Fig. 2.
(b) Setting of external voltage V
S
and limiting resistor R
S
.
The relation between V
S
and R
S
is shown in Fig. 10. When in the VCO stop mode, the value of R
S
must be set so
that the voltage on pin 11 is within the specified range (min=5.5V, max=V
CC
3V). For example, it is seen from
Fig.10 that the value of limiting resistor R
S
is approximately 2.2k
when the voltage on pin 11 is set to 6V at
V
S
=12V.
2. Checking of free-running frequency
Since no pin is provided for checking the free-running frequency, the free-running
frequency is checked through a burrer amplifier with a high input impedance, low
input capacitance connected to pin 16. Fig. 3 shows a sample circuit configuration.
The frequency measured in this circuit configuration is 456kHz or thereabouts. The
frequency in 19kHz equivalent can be obtained by dividing this measured value by 24.
The wiring across pin 16 and the buffer amplifier input must be made as short as
possible (within 1cm).
3. Ceramic resonator
Ceramic resonators other than specified cannot be used in applications of the LA3410. The Type No., manufacturer of
the ceramic resonators specified are shown below. For particulars about the ceramic resonator, contact the mamufacturer.
Type No.
Manufacturer
CSB456F11
Murata
KBR-457HS
Kyocera
4. Capture range and PLL loop filter constants
(1) Definition of capture range
Since the VCO of the LA3410 is adjustment-free, the capture range is defined by the following formula with the
deviation of the free-running frequency from the pilot signal considered.
Capture range C. R=
100 [%]
F0 : Free-running frequncy
F1 : Lock frequency when the input frequency is varied
F0F1
F1
F0456
456
LA3410
No.14076/13
(2) PLL loop filter constants
(a) The capture range of the LA3410 depends pri-
marily on input pilot level and PLL loop filter
constants C9 and R8 as shown in Fig. 4-A.
It is necessary to set C9 and R8, with the in-
put pilot level considered, so that the capture
range becomes wide but the stereo distortion
is kept rather low. The transfer function of the
loop filter is given by :
Lag filter F (S)=
Lag Lead filter F (S)=
R0 : IC internal resistance
and the response is given by Fig.4-B. The cap-
ture range may be made wide by the follow-
ing methods.
Set 3 high to make the band width wide (De-
crease C9).
TM Increase the high frequency gain F (
) so long
as the characteristic of the Lag Lead filter is
not lost (Increases R8).
Fig. 4-C shows the capture range characteris-
tic when C9 and R8 are varied. When R8 is
increased, the capture range will increase to a
certain point. R8 must be set in this range.
When R8 is increased, the STEREO-L, R dis-
tortion may worsen at low frequencies (100
to 400Hz). In this case, connect a capacitor of
200 to 1000pF across pin 3 and GND to im-
prove the STEREO-L, R distortion (Refer to
Fig. 5).
(3) Fig. 4-D shows the capature range characteris-
tic when C10 is varied. The adequate value of
C10, which depends on C9 and R8, is 0.33 to
3.3
F. If the value of C10 is decreased too
much, the capture range will decrease as seen
from Fig. 3 ; and if increased too much, the
stereo start time after VCO STOP release will
be made late.
1
SC9R0+1
SC10R8+1
SC10 (R0+R8)+1
LA3410
No.14077/13
(4) When C9 is decreased, the capture range will
widen but the stereo main distortion at f=10kHz
will worsen (beat distortion). This data is shown
in Fig. 4-E. Set C2 so that the stereo distortion
is kept rather low.
(5) The data on pilot level vs. capture range is
shown in Fig. 4-F to G. It is necessary to set the
loop filter constants, with the input pilot level
considered, so that the capture range becomes
wide. For example, when the LA1260 is used
for IF IC, the minimum demodulation output
will be 183mV (100% mod) and the stereo op-
eration must be performed at pilot level 12mV
with a pilot margin allowed. In this case,
C2=0.1
F, R1=6.8 to 10k
are recommended.
5. Improvement in sub, stereo (R) distortions worsened at low frequencies.
There are some cases where the sub, stereo (R) distortions are worsened
at low frequencies. One cause for this worsening is the phase shift be-
tween 38kHz and 19kHz in the flip-flop inside the IC. This shift is im-
proved by connecting a phase compensating capacitor across pin 3 and
GND as shown in Fig. 5. The CD value differs with each IF (the phase
shift between the sub signal and pilot signal in the composite signal
differs with each IF). An adequate value is 200 to 1500pF.
LA3410
No.14078/13
6. Separation adjust
The separatin is adjusted by varying the main signal level in the composite signal. The main signal is applied to the post
amplifier input through amplifiers A1, A3. The input level in A3 is varied by internal resistor RA and external variable
resistor VR1. Therefore, the output main signal becomes 0 at VR1=0 and is maximized at VR1=
. The separation is
presettable if VR1 is set to an adequate value. In this case, the VR1 value differs with each set ; X of VR1 is approxmately
150k
when the ratio of the main signal and sub signal at the LA3410 input is 1 : 1 and the sub signal and pilot signal
are in phase. The separation, when preset, varies 30dB min. with the variations in the IC only considered. If the value
of capacitor C8 for DC cut is decreased, the separation gets worse at low frequencies.
7. Post amplifier oscillation when loaded capacitively (inductively)
If the post amplifier outputs (pins 4, 7) are loaded capacitively (inductively), oscillation may occur. When connecting
a low-pass filter to each of the outputs, an input resistor must be connected across the post amplifier output and the low-
pass filter and the wiring across these points must be made as short as possible.
8. Forced monaural mode
The following method is used to provide the forced monaural mode. In this case, VCO oscillation does not stop. The
above-mentioned VCO stop method is used to stop VCO oscillation.
Connect pin 10 to GND through a resistor of 10k
.
Other application circuit
1. How to improve the dynamic range of the post amplifier
The amplifier bias voltage is set low (3.0V) so that the LA3410 is capable of being operated from low voltage. If the
supply voltage is high, the following method can be used to extend the dynamic range.
Fig. 6 shows how to extend the dynamic range of the post amplifier. When R
B
is not used, the DC voltage across pins
4 and 7 is 3.0V. The DC volatage across pins 4 and 7 can be increased to extend the dynamic range of the post amplifier.
Pins 5, 6, being minus input pins of the post amplifier, are virtual GND
points. By connecting R
B
across pin 5 and GND and across pin 6 and GND,
the DC voltages on pins 4, 7 are obtained as follows :
The upper and lower loss voltages of the post amplifier are approximately
2V and 0.5V respectively. With these loss voltages considered, the voltages
on pins 4, 7 are set. For example, Figs. 11, 12 show how the dynamic range
is improved when the DC voltages on pins 4, 7 are set to approximately
5.2V with upper loss voltage 2V and lower loss voltage 0.5V of the post
amplifier considered. Fig. 11 shows the characteristic where no R
B
is con-
nected ; Fig. 12 shows the characteristic where R
B
=82k
is connected.
2. Feedback resistance of post amplifier and total gain
Table 2 shows the feedback resistance of the post amplifier and the total gain. Fig. 13 shows the distortion vs. feedback
resistance characteristic. Figs. 14, 15 show the sample application circuits where R1 (R2) is 100k
and 130k
respec-
tively.
Table 2. R1 (R2), C3 (C4) gain
3.0 =3.0 (1+ )
R
B
+R
1
R
B
R
1
R
B
3.0 =3.0 (1+ )
R
B
+R
2
R
B
R
2
R
B
k
)
2
R
(
1
R
F
p
)
4
C
(
3
C
]
B
d
[
n
i
a
g
l
a
t
o
T
]
V
m
[
p
y
t
e
g
a
t
l
o
v
l
a
n
g
i
s
t
u
p
t
u
O
2
6
0
5
7
5
.
8
0
3
7
2
8
0
2
6
1
1
5
6
9
0
0
1
0
1
5
3
1
7
7
1
1
0
3
1
0
9
3
5
1
0
3
5
1
0
5
1
0
3
3
6
1
6
6
7
1
0
8
1
0
7
2
5
.
.
7
1
9
1
1
2
LA3410
No.14079/13
Decoder circuit (Refer to the Block Diagram in the Sample Application Circuit.)
The LA3410 adopts a decoder circuit of chopper type. The sub signal sync-detected by this decoder is applied to the
post amplifier minus input through R
B
as shown in the Sample Application Circuit. This signal is matrixed with the
main signal coming out of A3. The demodulation method is, in a sense, a combination of switching method and matrix
method. The gain for the sub signal is :
R1, R2 : Post amplifier feedback resistor
VS :
Peak value of input sub signal
The gain for the main signal is :
VR1 :
Semifixed resistor for separation adjust
V
M
:
Peak value of input main signal
In the LA3410, the gain of the main signal is varied with VR1 to adjust the separation. The IF output is generally such
that the sub signal level is lower than the main signal level. In this case also, the separation can be adjusted.
3. De-emphasis
The de-emphasis characteristic depends on the feedback resistors, capacitors of the post amplifier. R1, R2, C3, C4 in
the Sample Application Circuit are set as R1C3=R2C4=50
s, 75
s. Table 3 shows the values of R1, R2, C3, C4 and the
de-emphasis constants.
Table 3
The post amplifier requires feedback capacitors C3, C4 regardless of the de-emphasis characteristic. Without these
capacitors, the stereo distortion gets worse.
4. Low-pass filter
Fig. 8 shows a sample circuit configuration where an LC filter is used as the low-pass filter and Fig. 16 shows a sample
characteristic of this filter. As compared with the LPF (BL-13) in the Sample Application Circuit, the use of this filter
makes the attenuation less at 19kHz, 38kHz ; therefore, carrier leak at the LPF output causes the stereo distortion and
separation characteristic to get worse than specified in the Operating Characteristics. For the stereo distortion, the BL-
13 provides approximately 0.02%, while the LC filter provides approximately 0.5%
V
S
or V
S
R
1
R
B
2
R
2
R
B
2
V
M
or V
M
VR1
R
A
+VR1
R1
R
C
VR1
R
A
+VR1
R2
R
C
)
2
R
(
1
R
s
0
5
)
4
C
(
2
C
s
5
7
)
4
C
(
2
C
k
3
3
F
p
0
0
5
1
F
p
0
0
2
2
k
9
3
F
p
0
0
2
1
F
p
0
0
0
2
k
1
5
F
p
0
0
0
1
F
p
0
0
5
1
k
2
6
F
p
0
5
7
F
p
0
0
0
1
k
2
8
F
p
0
2
6
F
p
0
1
9
k
0
1
1
F
p
0
7
4
F
p
0
8
6
k
0
3
1
F
p
0
9
3
F
p
0
6
5
LA3410
No.140710/13
LA3410
No.140711/13
LA3410
No.140712/13
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be expor ted without obtaining the expor t license from the author ities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
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 February, 2000. Specifications and information herein are subject
to change without notice.
LA3410
PS No.140713/13
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