LA1266
Ordering number : EN2291B
AM/FM Tuner System Of
Electronic Tuning Type
Monolithic Linear IC
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
N3097HA (KT)/41594HK/9047AT/7256KI, TS No.2291-1/11
Functions
FM : IF amplifier, quadrature detector, AF
preamplifier, signal meter, IF count
outputlifier, tuning indicator drive output
(common with stop signal, muting drive
output)
AM : RF amplifier, MIX, OSC (with ALC), IF
amplifier, detector, AGC, signal meter, tuning
indicator drive output (common with stop
signal), IF count output, local OSC buffer.
Features
Minimum number of external parts required.
Excellent S/N
Local OSC with ALC
Local OSC buffer
Tuning indicator pin (common with narrow-band
stop signal and muting drive output)
Variable stop sensitivity (variable separately for
FM, AM)
Less tweet interference
Signal meter pin
IF count output
Specifications
Maximum Ratings
at Ta=25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
Pins 7,8,20
16
V
Flow-in current
I
8
Pin 8
20
mA
Flow-out current
I
22
Pin 22
1
mA
I
24
Pin 24
2
mA
Allowable power dissipation
Pd max
Ta
60C
700
mW
Operating temperature
Topr
20 to +70
C
Storage temperature
Tstg
40 to +125
C
Operating Conditions
at Ta=25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
8.5
V
Operating voltage range
V
CC
op
6 to 14
V
Package Dimensions
unit : mm
3067-DIP24S
[LA1266]
SANYO : DIP24S
Operating Characteristics
at Ta=25C, V
CC
=8.5V, See Test Circuit.
Parameter
Symbol
Conditions
Ratings
min
typ
max
Unit
[AM : fc=1MHz, fm=1kHz]
Quiescent current
Icco
No input
22
30
mA
Detection output
V
O
1
V
IN
=20dB, 30% mod.
30
60
110
mV
V
O
2
V
IN
=80dB, 30% mod.
90
150
210
mV
Signal to noise ratio
S/N1
V
IN
=20dB
15
19
dB
S/N2
V
IN
=80dB
49
54
dB
Total harmonic distortion
THD1
V
IN
=80dB, 30% mod.
0.3
1.0
%
THD2
V
IN
=107dB, 30% mod.
0.3
1.0
%
Signal meter output
V
SM
1
No input
0
0
0.2
V
V
SM
2
V
IN
=80dB
1.8
2.8
3.5
V
LED drive sensitivity
LED-ON
I
LED
=1mA
13
23
33
dBm
Local OSC buffer output
V
OSC
fosc=1.45MHz
220
280
340
mV
IF buffer output
V
IF
V
IN
=20dB
120
180
250
mV
[FM : fc=10.7MHz, fm=1kHz]
Quiescent current
Icco
No input
29
40
mA
Input limiting sensitivity
3dBL.S.
3dB down, 100% mod.
31
37
dB
Demodulation output
V
O
V
IN
=100dB, 100% mod.
270
390
540
mV
S/N ratio
S/N
V
IN
=100dB
78
84
dB
Total harmonic distortion
THD
V
IN
=100dB, 100% mod.
0.03
0.3
%
Signal meter output
V
SM
1
No input
0
0
0.2
V
V
SM
2
V
IN
=100dB
1.7
2.3
3.1
V
LED drive sensitivity
LED-ON
I
LED
=1mA
46
61
76
dB
LED drive bandwidth
LED-BW
V
IN
=100dB, I
LED
=1mA
70
105
140
kHz
AM rejection ratio
AMR
V
IN
=100dB, 100% mod.
45
58
dB
AM-1kHz, 30% mod.
IF buffer output
V
IF
V
IN
=50dB
110
160
230
mV
Equivalent Circuit Block Diagram
LA1266
No.2291-2/11
LA1266
No.2291-3/11
How to use LA1266
1. LED driver, muting drive output, stop signal(SD).
For LED drive, muting drive output, stop signal, the output at pin 8 is used.
Voltage on pin 8, when tuned, turns from "H" to "L" . (Active-low)
Signal bandwidth at pin 8
For AM, the bandwidth depends on the C.F(BFU450CN) at pin 14.
If a capacitor is connected in place of the C.F, the bandwidth will get wider.
For FM, the bandwidth depends on the resistance across pins 9 and 22.
If the resistance is increased, the bandwidth will get narrower.
R=15k
makes the bandwidth approximately 110kHz.
Sensitivity adjustment of LED, muting, stop signal
For FM, the semifixed variable resistor across pin 16 and GND is used.
For AM, the semifixed variable resistor across pin 17 and GND is used.
The relation (for AM,FM) between signal meter voltage and input voltage with the resistance of the semifixed
variable resistor as a parameter is shown below.
LED Drive Bandwidth
Resistance across Pins 9 and 22
FM S Meter Voltage
AM S Meter Voltage
Unit (capacitance : F)
Resisitance across Pins 9 and 22 k
IF input voltage dB
LED drive bandwidth kHz
S meter voltage V
S meter voltage V
Antenna input voltage dB/m
LA1266
No.2291-4/11
2. AM/FM changeover
AM/FM changeover is made using pin 20 as shown right.
However, the voltage on pin 20 relative to V
CC
(pin 7) must be within
the range of +0.1V to 0.8V. If not within this range, distortion and
selectivity will get worse. A resistance of 68k
at the IFT cold terminal,
which is used to prevent the changeover circuit from malfunctioning,
must be connected.
3. Local OSC buffer output
When local OSC buffer output waveform is saw-toothed at the SW mode, connect a reistance of 1.2k
or
thereabouts across pin 24 and GND.
4. Capacitance across pin 9 and GND
A large capacitance across pin 9 and GND may cause a
misstop at an adjacent channel when the channel select
speed is made faster at the autmatic channel select mode.
In thes case, decrease the capacitance across pin 9 and
GND.
However, if too decreased, the LED will flutter at low
modulation frequencies at the time of detuning.
Therefore, it is recommended to fix the capacitance
across pin 9 and GND to be 3.3F to 10F.
The relation between modulation frequency and
demodulation output voltage on pin 9 with the
capacitance across pin 9 and GND as a parameter is
shown right.
5. If the coupling coefficient of the local OSC coil is small and an antiresonance point of approximately 100MHz is
present or the stray capacitance across pin 24 and pin 23 is large, a parasitic oscillation of approximately 100MHz
may occur in the buffer output (pin 24). In this case, connect a capacitance of approximately 30pF across pin 24 and
GND.
6. AM OSC coil
Generally speaking, the following should be noted. Avoid winding with loose coupling between primary side and
secondary side (especially SW1, SW2). To be concrete, the pot core type is better than the screw type which is loose
in coupling. This prevents the local OSC frequency from turning third
resonance frequency related to the coupling coefficient.
7. Resistance across pin 8 and V
DD
If pin 8 is used for stop signal (SD) only, without using LED, it is
recommended to fix resistance R
L
across pin 8 and V
DD
to be 51k
to
100k
.
8. To prevent whistle from worsening, make the pattern of AM output pin 15 as
short as possible.
9. AM, FM IF buffer output
Application of a voltage to pin 13 (STRQ) causes AM IF(455kHz) signal (at AM mode) and FM IF(10.7MHz) signal
(at FM mode) to be delivered at pin 11 and pin 10, respectively. It is recommended that the voltage to be applied to
68k
V9
Modulation Frequency
V9
mVrms
Modulatin frequency
Hz
LA1266
No.2291-5/11
Test Circuit : FM, AM-MW
AM Current Drain Characteristic
AM Input/Ontput Characteristic
FM Current Drain Characteristic
Unit (resistance :
, capacitance : F)
Current drain, I
CC
mA
Current drain, I
CC
mA
Noise voltage, Detection output dBm
Total harmonic distortion, THD %
Antenna input voltage dB/m
Antenna input voltage dB/m
Antenna input voltage, V
IN
(ANT) dB/m
(Inciuding no LED current)
Noise voltage
I
CC
(Inciuding no LED current)
Detection output 1kHz-30%
THD V
IN
(ANT)
Input voltage, V
IN
dB
LA1266
No.2291-6/11
AM S Meter Current Characteristic
S meter current, I
SM
mA
S meter voltage,Vsm V
Attenuation dB
Total harmonic distortion, THD %
IF buffer output mV Current drain, I
CC
mA
Sensitivity
dB/m
Detection output
dBm
Total harmonic distortion, THD %
S meter voltage, V
SM
V
Attenuation dB
S/N dB Detection output dBm
IF buffer output mV
Antenna input voltage dB/m
AM S Meter Voltage Characteristic
Fidelity Characteristic
Selectivity Characteristic
AM V
CC
Characteristic
AM Temperature Characteristic (1)
Antenna input voltage dB/m
Modulation frequency Hz
Supply voltage,V
CC
V
Ambient temperature, Ta C
Current drain, I
CC
no signal
Detection output
Input=80dB
, 1kHz-30% mod
THD input=80dB, 1kHz-30% mod
S/N Input=80dB
IF output Input=80dB
IF output Input=80dB
Input=20dB
Input=20dB
Detection output (Input=100dB/m)
S meter voltage
Input=0
Input=100dB/m
Input=45dB/m
If buffer output (Input=45dB/m)
Output 30mV sensitivity
LED lighting sensitivity
Frequency,
f kHz
Non-modulation
See Test Circuit.
Attenuation
Distorrion
f=1MHz
100dB/m Input constant
30% mod
f=1MHz
1kHz-30% mod
Output 50mV
constant
Non-modulation
See Test Circuit.
LA1266
No.2291-7/11
S meter current, I
SM
A
S meter voltage, V
SM
V
S meter voltage, V
SM
V
Sensitivity dB
LED-on Voltage V
Noise voltage, AM output,
Detection output dBm
Total harmonic distortion, THD %
Sensitivity
dB
Detection output
dBm
IF buffer output mV Current drain, I
CC
mA
S meter voltage, V
SM
V
AM Temperature Characteristic(2)
FM Input/Output Characteristic
Distortion Characteristic
FM S Meter Characteristic
FM V
CC
Characteristic
FM S Meter Voltage Characteristic
IF input voltage dB
IF input voltage dB
Supply voltage, V
CC
V
IF input voltage db
IF input voltage dB
V
SN input=25dB
V
SN
no input
Detection output 1kHz-75kHz dev
AM output
1kHz-30% mod
Noise Voltage
f=10.7MHz
THD 1kHz-75kHz dev
Detection output (Input=100dB)
Current drain, I
CC
no signal
-3dB limiting sensitivity
LED lighting sensitivity
Input=100dB
S meter voltage Input=100dB
0dB
IF buffer output (Input=50dB
)
LED-on voltge
LED-lighting sensitivity
Output 20mV sensitivity,1kHz-30% mod
Non-modulation
See Test Circuit.
Non-modulation
See Test Circuit.
S/N=20dB sensitivity, 1kHz-30% mod
V
SN input=80dB
Ambient temperature, Ta C
LA1266
No.2291-8/11
Detection output dBm
S/N dB
S meter voltage, V
SM
V
Sensitivity dB/m Interference dB
Total harmonic distortion, THD %
Sensitivity dB
IF buffer output mV
LED-on voltage V
Bandwidth kHz
FM Temperature Characteristic(1)
AM Receiving Characteristic
FM Temperature Characteristic(1)
Detection output
Input=100dB, 1kHz-100% mod
IF buffer output Input=100dB
LED-on voltage
LED lighting sensitivity
-3dB limiting sensitivity,
1kHz-100% mod
LED-BW, Input=100dB
S/N Input=100dB
THE Input=100dB, 1kHz-100% mod
V
SM
Input=100dB
V
SM
Input=50dB
V
SM
no input
IF interference
Image interference
Usable sensitivity (1kHz - 30%mod, S/N=20dB)
Maximum sensistivity
(1kHz - 30% mod, detection output 40mV)
Tracking adjust at each frequency.
Ambient temperature, Ta C
Receiving frequency, fr kHz
Ambient temperature, Ta C
LA1266
No.2291-9/11
Coil Specifications
MW antenna
Bar antenna (for PVC22KTL)
TN-10896 (Mitsumi)
Loop antenna (for SVC321)
LA300 (Korin Giken)
Loop antenna. matching coil
KL-412
YT-30150 (Mitsumi) KO-387 (Korin Giken)
For SVC321
AM IFT coil
Matching coil for SFZ450B
(2-element type)
FM double tuning detection coil
HW-6146 HW-40131
(Mitsumi)
(Mitsumi)
(Mitsumi)
Tight solenoid direct winding
space winding
tight solenoid winding
Internal 180pF
Internal 100pF10%
Internal 100pF10%
Unit (resistance :
)
LA1266
No.2291-10/11
Sample Application Circuit : LA1177, LA1266, LM7000
Unit (resistance :
, capacitance : F)
LA1266
No.2291-11/11
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:
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.
Noise voltage, AM output,
Detection output dBm
S meter voltage V
Total harmonic distortion, THD %
LA1177+LA1266 Overall Characteristic
LA1177+LA1266 Overall Characteristic
Input dB
Detection output
(75kHz dev.)
S meter (non-modulation,VR=15k
)
THD (1kHz-75kHz dev.)
AM output (1kHz-30%mod)
Noise voltage
Input dB
PDF 
ZIP