LA1265
Ordering number : EN1820C
FM/AM Tuner 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
N2897HA (KT)/40194HK/O077KI/D095KI/2255KI, TS No.1820-1/15
Functions
FM : IF amplifier, quadrature detector, AF preamplifier,
signal meter, 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).
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).
Package Dimensions
unit : mm
3059-DIP22S
[LA1265]
SANYO : DIP22S
Variable stop sensitivity (variable separately for FM, AM)
Low whistle.
Signal meter pin.
Specifications
Maximum Ratings
at Ta=25C, See specified Test Circuit.
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
Pins 7, 8, 17
16
V
Flow-in current
I
8
Pin 8
20
mA
Flow-out current
I
20
Pin 20
1
mA
I
22
Pin 22
2
mA
Allowable power dissipation
Pd max
Ta
60C
650
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 operating voltage V
CC
8.5
V
Operating voltage range
V
CC
op
6 to 14
V
Operating Characteristics
at Ta=25C, V
CC
=8.5V, See specified Test Circuit
Parameter
Symbol
Conditions
Ratings
min
typ
max
Unit
[AM : f=1MHz]
Quiescent current
Icco
No input
18
26
mA
Detection output
V
O
1
V
IN
=20dB, 400Hz, 30% mod.
30
50
90
mV
V
O
2
V
IN
=80dB, 400Hz, 30% mod.
110
160
220
mV
S/N
S/N1
V
IN
=20dB
16
20
dB
S/N2
V
IN
=80dB
49
54
dB
Total harmonic distortion
THD1
V
IN
=80dB, 400Hz, 30% mod.
0.3
1.0
%
THD2
V
IN
=107dB, 400Hz, 30% mod.
0.5
2.0
%
Signal meter output
V
SM
1
No input
0
0
0.2
V
V
SM
2
V
IN
=80dB
2.4
2.8
3.1
V
LED lighting sensitivity
VLED on
I
LED
=1mA
15
24
33
dB
Local OSC buffer output
V
OSC
f
OSC
=1.45MHz
220
275
330
mV
[FM : f=10.7MHz]
Quiescent current
Icco
No input
20
28
mA
Input limiting sensitivity
3dBL.S.
3dB down, 400Hz, 100% mod.
31
37
dB
Demodulation output
V
O
V
IN
=10dB, 400Hz, 100% mod.
240
330
460
mV
S/N
S/N
V
IN
=100dB
78
84
dB
Total harmonic distortion
THD
V
IN
=100%dB, 400Hz, 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
1.5
2.7
3.1
V
LED lighting sensitivity
LED-on
I
LED
=1mA
35
50
65
dB
LED lighting bandwidth
LED-BW
V
IN
=100dB, I
LED
=1mA
90
120
160
kHz
AM rejection ratio
AMR
V
IN
=100dB, FM=400Hz
45
60
dB
100% mod. AM=1kHz 30% mod.
LA1265
No.1820-2/15
Ambient temperature, Ta C
Allowable power dissipation, Pd max mW
LA1265
No.1820-3/15
How to use the LA1265
1. LED lighting, muting drive output, stop signal (SD).
For LED lighting, muting drive output, stop signal, the output at
pin 8 is used.
The 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 CF (BFU450CN) at
pin 11. If a capacitor is connected in place of the CF, the
bandwidth will get wider.
For FM, the bandwidth depends on the resistance across pins
9 and 20. If the resistance is increased, the bandwidth will get
narrower. R=15k
makes the bandwidth approximately
120kHz.
Sensitivity adjustment of LED, muting, stop signal.
For FM, the semifixed variable resistor across pin 13 and GND is used.
For AM, the semifixed variable resistor across pins 13 and 14 is used. Be sure to start adjustment for FM, and then
make adjustment for AM. For the stop signal sensitivity and FM stop signal bandwidth, the variations should be
considered and it is recommended to use the semifixed variable resistor for adjustment.
LED lighting sensitivity setting for AM.
For the LED lighting sensitivity setting for AM, it is desirable that the IC input be 30dB (antenna input :
approximately 50dB/m). In this case, the value of VR1 is 30k
.
Equivalent Circuit Block Diagram
Resistance across pins 9 and 20 k
LED Lighting Bandwidth Resistance across pins 9 and 20
LED lighting bandwidth kHz
S Carve
S meter
LA1265
No.1820-4/15
3. Local OSC buffer output
When local OSC buffer output wave form is saw-toothed at the SW mode, connect a resistance of 1.2k
or
thereabouts across pin 22 and GND.
4. AM input pin
It is desirable that the AM input pin (pin 19) be L-coupled to pin 18.
Inputting to pin 19 can be done by DC-cutting with a capacitor. However, an unbalance in the RF amplifier
(differential amplifier) causes gain drop and whistle worsening.
5. 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 automatic channel select mode. In this 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.
LED lighting sensitivity setting for FM.
For the LED lighting sensitivity setting for FM, the IC
input may be 45dB to 60dB. With the variations in the
front end considered, it is ideal that the IC input in a
standard receiving set be 51dB to 54dB. The lower
value of VR2 for the LED lighting sensitivity setting is as
illustrated right. Since the variations in the front end cause
the IC input setting sensitivity to vary, it is recommended
to use a value of VR2 at an input voltage lower than a
standard setting by 6dB or greater. For example, if IC
input 53dB is taken as a standard, use VR2
100k
at IC
input 47dB.
2. AM/FM changeover
Two selections are available for changeover as shown below
: (A) pin 17-used method and (B) pin 18-used method.
For (A), the voltage on pin 17 relative to V
CC
(pin 7) must be within the range of 0.8V to +0.1V. If not within this
range, distortion and selectivity will get worse.
For (A), a resistance of 68k
at the IFT cold terminal, which is used to prevent the changeover circuit from
malfunctioning, must be connected.
(A) pin 17-use method for AM/FM changeover
(B) Pin 18-used method for AM/FM changeover
IC input dB
Semifixed Variable Resistor for FM
VR2 semifixed variable resistor value k
LED lighting sensitivity setting for FM
Ideal setting range
Modulation frequency Hz
V9 Modulation Frequency
LA1265
No.1820-5/15
Parameter Frequency
Admittance
Unit
IF
i1
10.7MHz
r
i
330
c
i
20
pF
FM
Parameter Frequency
RF
i19
1MHz
r
i
r
o
c
i
Admittance
Unit
k
pF
AGC-off (V16=1.4V)
AGC-on (V16=2.5V)
15
16
4
4
MIX
o17
500kHz
c
o
k
pF
3
3
r
i
IF
i15
500kHz
c
o
k
pF
2
2
10
8
AM
6. 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 pins 22 and 21 is large, a parasitic oscillation of approximately 100MHz may
occur in the buffer output (pin 22). In this case, connect a capacitance of approximately 30pF across pin 22 and GND.
7. 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 put it concretely, the pot core type is better than the screw core type which
is loose in coupling. This prevents the local OSC frequency from turning third resonance frequency related to the
coupling coefficient.
8. Resistance across pin 8 and V
DD
.
If pin 8 is used for the stop signal (SD) only, without using LED, it is recommended to fix
resistance R
L
across pin 8 and GND to be 51k
to 100k
.
9. To prevent whistle from worsening, make the pattern of AM output pin 12 as short as
possible.
Input/Output Admittance
Test Circuit
: FM, AM-MW
T1 4147-1457-177 (Sumida)
T2 HW-40174 (Mitsumi)
T3a HW-40130, T3b HW-40131 (Mitsumi)
Unit (resistance :
, capacitance : F)
LA1265
No.1820-6/15
IF input voltage dB
FM Input/Output Characteristics
Detection output, Noise voltage dBm
Noise voltage
IF input voltage dB
FM Signal Meter Current Characteristic
Signal meter current, I
SM
mA
Non-modulation
See test circuit.
Antenna input voltage dBm
MW Input/Output Characteristics
Noise voltage, Detection output dBm
Total harmonic distortion, THD %
reception
Antenna input voltage dBm
AM Signal Meter Voltage Characteristic
Signal meter voltage, V
SM
V
Antenna input voltage dBm
AM Signal Meter Current Characteristic
Signal meter current, I
SM
mA
Non-modulation
See test circuit.
Non-modulation
See test circuit.
Modulation frequency Hz
MW Fidelity Characteristics
Attenuation dB
Total harmonic distortion, THD %
reception
Attenuation
Distortion
input
Noise
voltage
Mod.
IF input voltage dB
FM Signal Meter Voltage Characteristic
Signal meter voltage, V
SM
V
Non-modulation
See test circuit.
IF input voltage dB
Total harmonic distortion, THD %
AM output
LA1265
No.1820-7/15
Receiving frequency, f
r
kHz
MW Reception Characteristic
Sensitivity dB/m Interference dB
Tracking adjust at each frequency
IF interference
Frequency deviation,
f Hz
MW Detuning Characteristic
Detection
output dBm
Supply voltage, V
CC
V
Local OSC buffer output, V
OSC
mV
Local OSC buffer output, V
OSC
mV
IF input voltage dB
Current drain, I
CC
mA
Receiving frequency, f
r
kHz
Frequency deviation,
f kHz
Selectivity Characteristic
Attenuation dB
Output 25mV const.
Frequency, f Hz
Spurious Characteristic
Response dB
Reception : 1kHz
(400Hz-30% mod.,
detection output 20mV)
Max. sensitivity
Usable sensitivity (400Hz-30% mod., S/N=20dB)
Image
interference
FM Current Drain Characteristic
Antenna input voltage dBm
Current drain, I
CC
mA
AM Current Drain Characteristic
I
CC
(including
no LED current)
(including no LED current)
LA1265
No.1820-8/15
Ambient temperature, Ta C
Supply voltage, V
CC
V
Ambient temperature, Ta C
FM Temperature Characteristics
FM V
CC
Characteristics
AM Temperature Characteristics
Sensitivity dB
Detection output dBm
Sensitivity dB
S meter voltage, V
SM
V
Current drain, I
CC
mA
Total harmonic distortion, THD %
Total harmonic
distortion,THD %
Bandwidth, LED-BW kHz
Sensitivity dB
Noise voltage, V
N
dBm Detection output dBm
S meter voltage, V
SM
V
S meter voltage, V
SM
V
Noise voltage, V
N
dBm
Detection output dBm
Detection output
Input
input
input
input
Detection output
input
input
input
no input
S/N=20dB sensitivity 400Hz-100% mod.
Output 20mV sensitivity
LED lighting
sensitivity
input
input
input
no input
Detection output (Input=100dB)
3dB limiting sensitivity
S meter voltage
Input
LED lighting sensitivity
Input
Input
Current drain, I
CC
No signal
3dB limiting sensitivity
LED lighting
sensitivity
input
LA1265
No.1820-9/15
Test Circuit
: SW2
Unit (resistance :
, capacitance : F)
T0 : YT-30177 (Mitsumi)
T1 : HW-40184 (Mitsumi)
T2 : HW-40174 (Mitsumi)
T3a : HW-40130, T3b : HW-40131 (Mitsumi)
Variable capacitor PVC 22KTL (Mitsumi)
Supply voltage, V
CC
V
AM V
CC
Characteristics
Detection output dB
Sensitivity dBm
S meter voltage, V
SM
V
Current drain, I
CC
mA
Current drain, I
CC
No signal
Detection output (Input=100dB)
Output 20V sensitivity
LED lighting sensitivity
Input
Input
S meter voltage
Input
Dummy
LA1265
No.1820-10/15
IEC input voltage dB
Detection output
SW2 Input/Output Characteristics
Noise voltage, Detection output dBm
Total harmonic distortion, THD %
IEC input voltage dB
SW2 Input/Output Characteristics
Noise voltage, Detection output dBm
Receiving frequency, f
r
MHz
Usable
sensitivity
Image
sensitivity
Max. sensitivity
Input at detection
output 20mV
Image interference dB Sensitivity dB
Frequency, f Hz
8.5MHz Spurious Characteristics
Spurious dB
Receiving frequency
Image frequency
Total harmonic distortion, THD %
IEC input voltage dB
Detection output
SW2 Input/Output Characteristics
Noise voltage, Detection output dBm
Total harmonic distortion, THD %
Noise
voltage
Noise
voltage
Detection output
Noise
voltage
Detection output
Referenced to output 20dBm
Receiving frequency, f
r
MHz
8.5 to 9.4MHz Spurious Characteristics
Spurious dB
Receiving frequency
Image frequency
Referenced to output 20dBm
LA1265
No.1820-11/15
Coil Specifications
MW antenna
Bar antenna (for PVC22KTL)
TN-10896 (Mitsumi)
Tight solenoid direct winding
17T 0.5
space winding
4T tight solenoid winding
Loop antenna (for SVC321)
LA300 (Korin Giken)
Loop antenna matching coil
KT-412
MW OSC
4147-1457-177 (Sumida)
For PVC22KTL
KO-387 (Korin Giken)
For SVC321
AM-IFT
Matching coil for SFU450B (1-element type)
Matching coil for SFZ450B (2-element type)
FM single tuning detection coil
(Mitsumi)
Internal 180pF
(Sumida)
Internal 180pF
(Mitsumi)
Internal 180pF
(Sumida)
Internal 180pF
(Mitsumi)
Internal 82pF10%
Damping resistance
Internal 82pF10%
Damping resistance
(Sumida)
LA1265
No.1820-12/15
FM double tuning detection coil
(Mitsumi)
(Mitsumi)
Internal 100pF10%
Internal 100pF10%
(Sumida)
(Sumida)
Internal 62pF10%
Unit (resistance :
)
Internal 82pF10%
LA1265
No.1820-13/15
Sample Application Circuit
: LA1186N + LA1265 (US Band)
Unit (resistance :
, capacitance : F)
B.P. F SNY-2101 (Sumida)
T1
: YT-30224 (Mitsumi)
V
D
1, V
D
2=SVC201
T2
: KL412 (Korin)
BL-70
V
D
3, V
D
4=SVC321
T3
: KO387 (Korin)
TC1=20pF
T4
: HW-40174 (Mitsumi), 2150-2061-049 (Sumida)
TC2=20pF
T5a
: HW-40130 (Mitsumi), 2231-096 (Sumida)
CF1, CF2=SFE10.7MA
T5b
: HW-40130 (Mitsumi), 2231-096 (Sumida)
CF3=SFZ450B (Murata)
CF4=BFU450CN (Murata)
L1 : YT-30196 (Mitsumi), 0708-700 (Sumida)
L2 : HW50433 (Mitsumi), 0267-034 (Sumida)
LA1265
No.1820-14/15
Sample Printed Circuit Pattern
(Cu-foiled area)
LA1186+LA1265 Overall Characteristics
Input dB
Detection output (75k dev)
Signal meter
Noise voltage
AM output
Noise voltage, AM output, Detection output dBm
Total harmonic distortion, THD %
Signal meter V
LA1186+LA1265 Overall Characteristics
Input dB/m
Detection output
Signal meter
Noise voltage
Noise voltage, AM output, Detection output dBm
Total harmonic distortion, THD %
Signal meter V
LA1265
No.1820-15/15
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.
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