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LA1260
Ordering number : EN1506D
FM/AM Tuner Systemfor Radio-Casette Recorders, Music Centers
Monolithic Linear IC
SANYO Electric Co.,Ltd. Semiconductor Bussiness HeadquartersTOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
N2897HA (KT)/33194HO/O067KI/8225MW/4045KI/8084KI, TS No.1506-1/14
FunctionsFM : IF amplifier, quadrature detector, AF preamplifier,
tuning indicator drive output.
AM : RF amplifier, MIX, OSC (with ALC), IF amplifier,
Detector, AGC, tuning indicator drive.
Features• Minimum number of external parts required (No AM
detection coil required).
• High S/N : FM 81dB
AM 53dB
• Low-level AM oscillator with ALC : Pin 16 OSC output
MW 130mV
SW 70 mV to 90 mV
(7MHz) (24MHz)
Package Dimensions
unit : mm
3006B-DIP16
[LA1260]
SANYO : DIP16
• Less AM whistle interference : Whistle 1% at input 100dB/m.
• On-chip LED tuning indicator driver.
• On-chip FM/AM selector.
• Independent FM/AM output pins : Possible to set FM/AM frequency characteristic independently.
SpecificationsMaximum Ratings at Ta=25°C, See specified Test Circuit.
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max Pins 6, 12 9 V
Maximum current drain ICC max Pins 6+7+12 50 mA
Flow-in current I7 Pin 7 20 mA
Flow-out current I15 Pin 15 0.1 mA
Allowable power dissipation Pd max Ta≤70°C 450 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +125 °C
Operating Conditions at Ta=25°C
Parameter Symbol Conditions Ratings Unit
Recommended operating voltage VCC 4.5 V
Operating voltage range VCC op 3.0 to 8.0 V
Operating Characteristics at Ta=25°C, VCC=4.5V, See specified Test Circuit
Parameter Symbol ConditionsRatings
min typ maxUnit
[AM Characteristics : f=1MHz]
Quiescent current Icco AM VIN=No input 7.5 10.5 mA
Detection output VO1 VIN=23dBµ, 400Hz-30% mod. –33 –28 –23 dBm
17.3 31 55 mV
S/N ratio S/N1 VIN=23dBµ, 400Hz-30% mod. 18.0 21.5 dB
Detection output VO2 VIN=60dBµ, 400Hz-30% mod. –19.0 –16.0 –13.0 dBm
87 122 174 mV
S/N ratio S/N2 VIN=60dBµ, 400Hz-30% mod. 48 53 dB
Total harmonic distortion THD1 VIN=60dBµ, 400Hz-30% mod. 0.45 1.3 %
THD2 VIN=100dBµ, 400Hz-30% mod. 1.5 3.0 %
LED lighting voltage VLEDAM IC=1mA 22 30 38 dBm
Oscillation output (24MHz) VOSC24M 60 86 120 mV
[FM Characteristics : f=10.7MHz]
Quiescent current IccoFM VIN=No input 8.5 12.0 mA
–3dB sensitivity VINlim –3dB down, 400Hz-100% mod. 35 42 dBµ
Demodulation output VO3 VIN=80dBµ, 400Hz-100% mod. –12.5 –9.5 –6.5 dBm
183 260 367 mV
S/N ratio S/N3 VIN=80dBµ, 400Hz-100% mod. 77 81 dB
S/N4 VIN=80dBµ, 400Hz-30% mod. 71 dB
Total harmonic distortion THD3 VIN=80dBµ, 400Hz-100% mod. 0.55 1.2 %
THD4 VIN=80dBµ, 400Hz-30% mod. 0.05 %
LED lighting voltage VLEDFM IL=1mA 39 49 dBµ
AM rejection ratio AMR VIN=80dBµ, 400Hz-100% FM mod. 60 dB
1kHz-30% AM mod.
Equivalent Circuit Block Diagram
LA1260
No.1506-2/14
LA1260
No.1506-3/14
Unit (resistance : Ω, capacitance : F)
T1 Mitsumi YT30194 (56pF tuning)T2 Mitsumi KW30011T3 Mitsumi YT30105T4 Mitsumi YT30112
Proper Cares in Using the ICExternal parts placement and pattern
• The AM local oscillation parts, AM local oscillation coil, and antenna circuit parts such as bar antenna must be
separated from each other as far as possible to prevent Qs from worsening.
• Pin 16 (AM oscillation injection pin) and pin 14 (RF input pin) must be separated from each other on the pattern as
shown in Figure. A below. Care should be taken not to make unwanted coupling by parallel wiring as shown in
Figure B to prevent Qs from worsening.
FM quadrature detection coil
• The values recommended for the detection coil are shown below. (See Figure 1.)
Tuning capacitance : 56pF
Damping resistance : 6.8kΩ• Values other than recommended provide the LED drive characteristic as shown below.
Figure A Good example Figure B Bad example
Value increased Value decreased
Tuning capacitance • Lighting is delayed.• No lighting may occur at low
temperature.
• Lighting is advanced.• Mislighting may occur in the
absence of signal.
Damping resistance • Lighting is advanced.• Mislighting may occur in the
absence of signal.
• Lighting is delayed.• No lighting may occur at low
temperature.
If the product of tuning capacitance and damping resistance is equal to that of values recommended above (e. g.
tuning capacitance=82pF, damping resistance=4.7kΩ), other characteristics (demodulation output, S/N, THD, etc.)
than the LED drive characteristic remain almost unaffected.
• For applications where a double tuning coil is used, refer to "Applications where a double coil is used" on page 13.
Test Circuit
LA1260
No.1506-4/14
How to apply FM AFC
The S curve at the FM output pin (pin 8) is as shown in Figure 1. Therefore, the domestic (Japan) band (lower local
oscillation) use and foreign band (upper local oscillation) use differ as shown in Figures 2 and 3.
AM local oscillation
Since the LA1260 contains an ALC circuit, the oscillation level at pin 16 can be limited to 60 to 150mV in the
following applications where a coil is used.
Stable oscillation occurs at a coil impedance of 5kΩ or greater viewed from across pins 16 and 15. Turn ratio n and
QO must be determined so that the oscillation level at pin 16 becomes 75mV or greater for MW use and 60mV or
greater for SW use.
If turn ratio n is increased more than needed, the oscillation level at pin 16
drops, thereby lowering the maximum sensitivity as shown in Figure 5 and 6.
Figure 7 shows the relation between turn ratio n and oscillation level at pin
16 in the MW band.
Unit (capacitance : F)
Figure 1 Figure 2 Domestic (lower localoscillation) band
Figure 3 Foreign (upper localoscillation) band
Unit (resistance : Ω, capacitance : F)
Unit (capacitance : F)
OSC injection voltage at pin 16 – mV
Max
imum
sen
sitiv
ity, V
SU
sabl
e se
nsiti
vity
, QS
– d
B/m
Max
imum
sen
sitiv
ity, V
SU
sabl
e se
nsiti
vity
, QS
– d
B/m
OSC injection voltage at pin 16 – mV
21MHz reception mode fr=1000kHz reception
Maximum sensitivity(input at detectionoutput –30dBm)
Maximum sensitivity(input at detectionoutput –30dBm)
Usable sensitivity (S/N=20dB)
Usable sensitivity(S/N=20dB)
Figure 5 Figure 6
Figure 4
LA1260
No.1506-5/14
AM oscillation coil
Generally speaking, the following should be noted. Winding with loose
coupling between 1 and 2 and between 1 and 3 must be avoided. (Particularly
SW1, SW2).
To put in concretely, the pot core type is better than the screw core type which
is loose in coupling. This prevents the local oscillation frequency from turning
third resonance frequency related to the coupling coefficient.
LED unlighted time and distortion in AM (MW)
By increasing the value of the electrolytic capacitor for AGC at pin 11 (Figure 8), the distortion in the AM mode can
be improved, but the LED unlighted time is made longer. 10µF is recommended for obtaining the optimum LED
unlighted time and distortion. The LED unlighted time is 200ms at this value (Approximately 400ms at 22µF).
FM-AM selection and dc level at pin 12
(1) Pin 12-used method=recommended circuit
The FM mode is entered with pin 12 open. When pin 12 and pin 6
are at the same potential in terms of DC, the AM circuit is turned on
by the internal switch. It should be noted that the dynamic range is
narrowed whether the potential at pin 12 is lower or high than that
at pin 6.
(2) Pin 13-used method
The AM mode is entered with pin 13 open. When pin 13 is
grounded, the FM circuit is turned on and the AM circuit is turned
off by the internal switch. In this case, pin 12 and pin 6 (VCC) are
at the same potential.
Unit (capacitance : F)
Receiving frequency, fr – Hz
OSC
vol
tage
at c
oil e
nd, V
OSC
– m
V
V16
OSC
vol
tage
–
mV
Figure 7
MW OSC characteristic
Modulation degree – %
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
Figure 8
Input 100dBmVCC=4.5VAM mod. char. and electrolyticcapacitor at pin 11.
100Hz, capaci
tor acro
ss pin 11 an
d Gnd : 10µF
V16
OSC
vol
tage
OSC
vol
tage
at c
oil e
nd
Relation between turnration n and OSC level
Unit (capacitance : F)
LA1260
No.1506-6/14
FM IF/MW Test Circuit
Unit (resistance : Ω, capacitance : F)
L1 TN10896 (Mitsumi)T1 YT-30194 (Mitsumi), 2153-4095-239 (Sumida)T2 KW-30011 (Mitsumi)T3 YT-30105 (Mitsumi)
[FM Characteristics]
Antenna input voltage, VIN – dB/m
Modulation frequency – Hz
Noi
se v
olta
ge, V
Nde
tect
ion
outp
ut, V
O–
dB
m MW input char.1MHz reception
Antenna input voltage, VIN – dB/m
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
Atte
nuat
ion
–
dB
MW fidelity char.
Frequency, ∆ – kHz
Atte
nuat
ion
–
dB
Sensitivity char.f=1MHz
Output 25mV const
Attenuation
Distortion
Input 30% mod.
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
Vol
tage
at p
in 1
1 –
V
Cur
rent
dra
in, I
CC
– m
A
Voltage atpin 11
Current drain
LED lighted
Noisevoltage
Detection output
LA1260
No.1506-7/14
[FM Characteristics]
Frequency, ∆f – Hz
Det
ectio
nou
tput
– d
Bm MW detuning char.
Receiving frequency, ∆f – kHz
Sens
itivi
ty d
B/m
In
terf
eren
ce
– d
B
MW receiving char.Tracking adjust
at each freq.IF interference
Usable sensitivity
Max. sensitivity
Receiving frequency, ∆f – kHz
OSC
vol
tage
–
mV
rms OSC coil end
Input voltage – dB/m
Det
ectio
n ou
tput
,W
hist
le o
utpu
t –
dB
m
Detection output (400Hz-30% mod.)
IF input voltage – dBµ
Det
ectio
n ou
tput
,N
oise
out
put
–
dBm
Detection output
IF input voltage – dBµ
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
AM output
400Hz-75kHz dev
Noise voltage
Frequency, f – Hz
Res
pons
e –
dB
Reception : 1MHz MW char.
Whistle max
Frequency, ∆f – kHzW
hist
le o
utpu
t –
dB
m
Input 100dB/m
IC injection end V16
detectionoutput 20mV)
LA1260
No.1506-8/14
IF input voltage – dBµ
Vol
tage
at p
in 1
1, V
11
– V
ICC (including no LED current)
Supply voltage, VCC – V
OSC
fre
quen
cy, ∆
f OSC
– k
Hz
OSC
vol
tage
, VO
SC–
mV
OSC frequency (20MHz)
Supply voltage, VCC – V
OSC
fre
quen
cy, ∆
f OSC
– k
Hz
OSC
vol
tage
, Vol
tage
at p
in 1
6 –
m
V
OSC frequency (20MHz)
Ambient temperature, Ta – °C
OSC
fre
quen
cy, ∆
f OSC
– k
Hz
OSC
vol
tage
at p
in 1
6, V
OSC
– m
V
OSC frequency
Ambient temperature, Ta – °C
Sens
itivi
ty
– d
Bµ
Noi
se v
olta
ge, V
N–
dB
mD
etec
tion
outp
ut
– d
Bm
Cur
rent
dra
in, I
CC
– m
A
Tot
al h
arm
onic
dis
tort
ion,
TH
D –
%
Vol
tage
at p
in 1
1, 1
1V
– V
Input 60dBµ
THD input 100dBµ
Input
THD input
V11 input 60dBµ
V11 quiescent
LED lightedsensitivity
S/N 20mV sensitivity
Output 20mVsensitivity
Detectionoutput
ICC no input
OSC voltage
Injection voltage V16
Injection voltage V16
Supply voltage, VCC – V
Sens
itivi
ty
– V
Det
ectio
n ou
tput
–
dB
m
Cur
rent
dra
in, I
CC
– m
A
Vol
tage
at p
in 1
1, V
11
– V
Detection output
–3dB limiting sensitivity
LED lighted sensitivity
Voltage at pin 11
Input=80dBµ
Input=45dBµ
No input
Current drain, ICC
Quiescent
Supply voltage, VCC – V
Cur
rent
dra
in, I
CC
– m
A
Sens
itivi
ty
– d
B/m
Det
ectio
n ou
tput
–
dB
Cur
rent
dra
in, I
CC
– m
A
Vol
tage
at p
in 1
1 –
V
ICC no input
Sensitivity output 20mV
LED light sensitivity
quiescentLED lighted
Detectionoutput
LA1260
No.1506-9/14
Sample Application Circuit 1 : FM IF/SW2 (7.2 to 24.0MHz)
Unit (resistance : Ω, capacitance : F)
T1 YT-30194 (Mitsumi), 2153-4095-339 (Sumida)T2 KW-30011 (Mitsumi)T6 YT-30112 (Mitsumi)T7 YT-30117 (Mitsumi), 2158-4140-044 (Sumida)
Ambient temperature, Ta – °C
OSC
fre
quen
cy, ∆
f OSC
– k
Hz
OSC frequency
OSC
vol
tage
at p
in 1
6 V
OSC
(V16
) –
m
V
Ambient temperature, Ta – °C Ambient temperature, Ta – °C
FM o
utpu
tvo
ltage
, V8
–
VV
olta
ge a
t pi
n 15
: V
ref,
V15
–
V
Voltage at pin 15
Quiescent
THD min,
Output voltage V18
Sens
itivi
ty
– d
Bµ
Vol
tage
at
pin
11, V
11
– V
TH
D
– %
Dis
tort
ion,
Noi
se v
olta
ge
– d
Bm
Cur
rent
dra
in,I
CC
– m
A
Det
ectio
n ou
tput
–
dB
m
OSC voltage
Detectionoutput
Noisevoltage
Voltage pin 11
Distortion
Quiescent
LED lightedsensitivity
–3dB limitingsensitivity
Current drain 80dBµ
Quiescent
LA1260
No.1506-10/14
Receiving frequency, fr – Hz
Imag
e in
terf
eren
ce
– d
BSe
nsiti
vity
–
dB
µ
Usable sensitivityS/N=20dB
Receiving frequency, fr – Hz
OSC
vol
tage
, VO
SC–
VO
SC v
olta
ge, V
OSC
– V
IEC input voltage – dBµ
Vol
tage
at p
in 1
1, V
11
– V
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
SW OSC char.No tap
SW2 input char.
Detectionoutput 30% mod.
Noise voltage
Voltage at pin 11
LED lighted Distortio
n
Distortio
n
Voltage at pin 16
Image interference
Input at detectionoutput –30dBmMax. sensitivity
Det
ectio
n ou
tput
–
dB
m
IEC input voltage – dBµ
Vol
tage
at p
in 1
1, V
11
– V
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
SW2 input char.
Detectionoutput 30% mod.
Noise voltage
Voltage at pin 11
LED lighted
Det
ectio
n ou
tput
–
dB
m
LA1260
No.1506-11/14
Frequency, f – MHz
Spur
ious
–
dB
OSC
fre
quen
cy
Imag
e fr
eque
ncy
8.5MHz spurious responseOutput –39dBm
(referenced to ANTinput 24.5dBµ, 8.5MHz)
ANT input voltage – dB/m
Det
ectio
n ou
tput
, Noi
se v
olta
ge
– d
Bm
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %
SW input/output char.
ANT input voltage – dBµ
Det
ectio
n ou
tput
–
dB
m
Tot
al h
arm
onic
dis
tort
ion,
TH
D
– %LED lighted
AM mod. output
Noise voltage
Distortion
Detection output
30% detectionoutput
Noise
outp
ut Dis
tort
ion
Receiving frequency, fr – MHz
Spur
ious
–
dB
OSC
fre
quen
cy
8.5MHz to 9.4MHz spurious responseOutput –30dBm
(referenced to ANTinput 24.5dBµ, 8.5MHz)
LA1260
No.1506-12/14
Sample Application Circuit 2 : FM (band in US) /MW/SW1 (2.2 to 7.5MHz) /SW2 (7.2 to 24.0MHz)
Application where the LA1185 and LA1260 are used
[Circuit Diagram] (The sample printed circuit pattern is shown on page 13.)
Uni
t (re
sist
ance
: Ω
, cap
acita
nce
: F)
L1
TN
1089
6 ba
r an
tenn
a (M
itsum
i)T
3Y
T-3
0105
(M
itsum
i)T
25.
5mm
φai
r co
re 0
.88m
m w
ire
4T R
FT
4Y
T-3
0224
(M
itsum
i)L
35.
5mm
φai
r co
re 0
.88m
m w
ire
3T O
SCT
5Y
T-3
0134
(M
itsum
i)T
1Y
T-3
0194
(M
itsum
i),
T6
YT
-301
12 (
Mits
umi)
2153
-409
5-33
9 (S
umid
a)T
7Y
T-3
0117
(M
itsum
i)T
2K
W-3
0011
(A
M M
ix)
2158
-414
0-04
4 (S
umid
a)
T4 : YT-30224 (Mitsumi)FM IF
Internal 100pF, external 5pF
LA1260
No.1506-13/14
Sample Printed Circuit Pattern : Cu-foiled area (The circuit diagram is shown on page 12.)
• Applications where a double tuning coil is used (See page 3.)The use of the following coil improves the distortion approximately 0.1% at 100% modulation.
ANT input voltage – dBµ
Det
ectio
n ou
tput
, Noi
se v
olta
ge
– d
Bm
Tot
al h
arm
onic
di
stor
tion,
TH
D
– %
Detectionoutput
AM output
Noisevoltage
Distortion
LED lighting sensitivity 11.5dBµ
(Korin Giken) (Korin Giken)
(Mitsumi) (Mitsumi)
Unit (resistance : Ω, capacitance : F)
LA1260
No.1506-14/14
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 lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall: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:Not impose any responsibilty 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 guarant-eed 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 November, 1997. Specifications and information herein are subject
to change without notice.