Sanyo LA1135M Am tuner system for car radios and home stereo Datasheet

Ordering number: EN1272E
Monolithic Linear IC
LA1135, 1135M
AM Tuner System for
Car Radios and Home Stereos
Overview
The LA1135 is a high-performance AM electronic tuner IC that
is greatly improved in cross modulation characteristics. It is
especially suited for use in car radio and home stereo (antenna:
loop) applications.
Package Dimensions
unit : mm
3021B-DIP20S
[LA1135]
Functions
. MIX
. OSC (with ALC)
. IF amplifier
. Detector
. AGC (normal)
. RF wide-band AGC
. Auto search stop signal (signal meter output)
. Local oscillation buffer output
. Others
SANYO : DIP20S
unit : mm
3036B-MFP20
Features
. Excellent cross modulation characteristics: Meets the
.
.
.
.
.
.
.
.
.
requirements for preventing not only adjacent-channel
interference but also interference caused by all channels
within broadcast band.
Narrow-band signal meter output: Usable as auto search stop
signal. Has linearity up to 80 dBµ.
Local oscillation buffer output: Facilitates designing of
electronic tuner system, frequency display, etc.
OSC (with ALC): Improves tracking error because
oscillation output is stabilized at a low level (380 mVrms)
for varactor diode.
MIX: Double-balanced differential MIX meeting the
requirements for preventing spurious interference, IF
interference.
Good characteristics at high input: 130 dBµ input
fm = 400 Hz 80% mod THD = 0.4% typ
Low noise: Good S/N at medium input (56 dB typ)
Usable sensitivity: (S/N = 20 dB input): 25 dBµ (2SK315
IDSS = 11mA)
VCC variation compensation: Less variation in gain,
distortion: 8 to 12 V
Reduced pop noise: Capable of reducing pop noise at the
time of VCC ON, mode select by adjusting AGC time
constant.
[LA1135M]
SANYO: MFP20
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA(II)/D0994JN/O217KI/4034KI.TS(KOTO) No.1272-1/18
LA1135, 1135M
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Conditions
Ratings
Unit
VCC max
Pins 8, 14
16
Output voltage
VO
Pins 7, 10
24
V
Input voltage
VIN
Pin 6
5.6
V
Current drain
ICC
Pins 7 + 8 + 10 + 14
41
mA
Flow-out current
I18
Pin 18
2
mA
I20
Pin 20
Allowable power
dissipation
Pd max
LA1135
Operating temperature
Storage temperature
LA1135M Ta % 60°C, with PCB
Topr
V
2
mA
730
mW
660
mW
LA1135
–20 to +70
°C
LA1135M
–40 to +80
°C
–40 to +125
°C
Ratings
Unit
Tstg
Operating Conditions at Ta = 25°C
Parameter
Recommended supply
voltage
Operating supply voltage
range
Symbol
Conditions
VCC
VCC op
8
V
7.5 to 12
V
Operating Characteristics at Ta = 25°C, VCC = 8 V, fr = 1 MHz, fm = 400 Hz, See specified Test
Circuit.
Parameter
Current drain
Detection output
Signal-to-noise ratio
Total harmonic distortion
Signal meter output
Input at signal meter output 1 V
Local oscillation buffer output
Symbol
ICC1
ICC2
VO1
VO2
S/N
THD1
THD2
THD3
VSM1
VSM2
VIN1
VOSC BUF
Conditions
Quiescent
130 dBµ input
16 dBµ input, 30% mod
74 dBµ input, 30% mod
74 dBµ input, 30% mod
74 dBµ input, 30% mod
74 dBµ input, 80% mod
130 dBµ input, 80% mod
Quiescent
130 dBµ input
VSM = 1 V
min
13.5
20.0
–29.0
–15.0
51.0
3.5
18.0
320
typ
22.5
30.0
–25.0
–12.0
56.0
0.3
0.3
0.4
0
5.0
24.0
380
max
32.5
41.0
–21.0
–9.0
1.0
1.0
2.0
0.3
7.5
30.0
Unit
mA
mA
dBm
dBm
dB
%
%
%
V
V
dBµ
mVrms
No. 1272-2/18
LA1135, 1135M
Reference Characteristics
Parameter
Symbol
Usable sensitivity
Conditions
Q.S.
Wide-band AGC
ON-state input
Detection output variation
∆VO
Local oscillation variation
within broadcast band
∆VOSC
Signal meter band *
25.0
dBµ
Reception 1.0 MHz quiescent
Interference 1.4 MHz non-mod
at input for AMT.D. ON
82.0
dBµ
Input 74 dBµ → 130 dBµ
0.2
dB
VOSCL – VOSCH
15
mVrms
74 dBµ input, frequency at
which output is reduced to 1/2
VSM-BW2
74 dBµ input, frequency at
which output is reduced to 1/10
30 % mod ±10 kHz *
IF interference
IF. R.
fr = 600 kHz *
Image frequency
interference
IM. R.
fr = 1400 kHz *
±1.5
kHz
–4.5/+7
kHz
43
dB
77.5
dB
52.0
(63.0)
dB
*: Wide-band AGC OFF
( ): See circuit on page 7.
Allowable power dissipation, Pd max – mW
Note:
Unit
Input at S/N = 20 dB
(2SK315 IDDS = 11 mA)
VSM-BW1
Selectivity
typ
Pd max – Ta
with 54 × 34 × 1.7 mm3 PCB
Ambient temperature, Ta – °C
Equivalent Circuit Block Diagram
No. 1272-3/18
LA1135, 1135M
Test Circuit 1
VCC = 8 V, fr = 1 MHz, fm = 400 Hz
DC voltmeter
Unit (resistance: Ω, capacitance: F)
Distortion
meter
Valve
voltmeter
VO
HF valve voltmeter
Coil
T1
Varactor diode
SVC321
(Sanyo)
Narrow-band filter BFU450CN (Murata)
Sample Printed Circuit Pattern
YT-30020
(Mitsumi)
T2
YT-30018
(Mitsumi)
T3
CFMA-027
(Toko)
T4
YT-30007
(Mitsumi)
T5
YT-30008
(Mitsumi)
Cu-foiled area 105 × 120 mm2
No. 1272-4/18
LA1135, 1135M
Test Circuit 2
VCC = 8 V, fr = 1 MHz, fm = 400 Hz
DC voltmeter
Detection output
Distortion meter
Probe load open
Unit (resistance: Ω, capacitance: F)
Coil
T1
YT-30202
(Mitsumi)
T2
YT-30018
(Mitsumi)
T3
CFMA-021A
(Toko)
T4
YT-30007
(Mitsumi)
T5
YT-30008
(Mitsumi)
Varactor diode
Narrow-band filter
SVC321
(Sanyo)
BFU450CN (Murata)
No. 1272-5/18
LA1135, 1135M
Proper cares in using IC
1.
2.
3.
4.
5.
Bias condition: RF VCC % IF VCC
Avoid coupling between the antenna tuning circuit and the local oscillation.
Connect detection capacitor C15 across pins 13 (output) and 14 (VCC) so that no leakage of the IF signal to the GND line
occurs. (If connected to GND, the tweet and the usable sensitivity may get worse.) Radiation from C15 may cause harmonics
in the IF signal to return to the RF stage, thereby leading to more tweet interference. So, connect C15 as close to pins 13, 14
as possible. Consider the direction of the capacitor and separate it from the ANT circuit.
For R9, use a semifixed resistor with VSM considered.
When designing the coils, consider the following conditions.
Shown below is the input level at each pin at which the detection output at fm = 400 Hz 30% mod becomes –25 dB.
ANT
MIX
16.0
28.0 45.0 61.0
IF
Det
(dBµ)
How to apply input to each stage
MIX stage
ANT stage
ANT input
Det stage
IF stage
Unit (resistance: Ω, capacitance: F)
6.
ANT damping
To make the ANT damping constant within the receiving band, change the application circuit as shown below.
Old circuit
New circuit
Double tuning
Double tuning
Measures
Replace R1 with CD.
CD (2000 pF to 3000 pF or thereabouts)
Relocate L2.
Damping (600 kHz to 1400 kHz) Old circuit –15 dB
New circuit –4 dB
No. 1272-6/18
LA1135, 1135M
7.
Meaning of L2
If the RF stage is double-tunned, the difference in sensitivity within the RF band almost disappears, but an antireasonance
point of approximately 20 MHz appears, thereby leading to worse spurious characteristics. So, L2 is used to remove the SW
band.
8.
Wide-band AGC
This IC contains 2-channel wide-band AGC. Pin 6 detects an undesired signal within the RF band and wide-band AGC is
applied. This detection sensitivity is determined inside the IC. Pin 2 detects an undesired signal outside the RF band. This
detection sensitivity is determined by R3. When 1 mVrms (f = 1 MHz) signal is applied to pin 2, AGC operates.
9.
Measures against suppression of sensitivity
In the AGC circuit of the test circuit the presence of an undesired signal of high strength within the receiving band may cause
the desired signal to be suppressed when the desired signal is low or medium in strength. Shown below is the circuit
configuration where the necessary measures are taken against this suppression.
S meter output
Wide-band
AGC input
Wide-band
AGC
circuit
Circuit added
ANT
damping pin
ANT
damping
driver circuit
Sample constants
RA= 4.3 kΩ
RB = 3.0 kΩ
(VSM-130 = 5.0 V)
10. Transient response of S meter output at search, stop mode
The circuit configuration shown below is available to stabilize the transient response of the S meter output at the search, stop
mode.
Signal during searching from PLL
Unit (resistance: Ω)
11. When using LW (approximately 50°C or greater), additionally connect a resistor of 27 kΩ across pins 18 and 19 against
increase in local oscillation level. When using MW, no additional resistor is required.
12. Improvement in image frequency interference
Change the RF double-tuning coil as follows, and the image frequency interference becomes 63 dB at fr = 1400 kHz.
(Q of the tuning circuit must not be decreased with resistor 100 kΩ.)
Continued on next page.
No. 1272-7/18
LA1135, 1135M
Usable sensitivity, Maximum sensitivity – dBµ
Image frequency interference – dB
Continued from preceding page.
Wide-band AGC OFF
Tracking at
each point
Usable sensitivity S/N 20 dB
Maximum sensitivity at –25 dB output
Unit (resistance: Ω, capacitance: F)
Receiving frequency, fr – kHz
Specification for coil
YT-30202(Mitsumi)
1-3
84T
4-6
17T
2157-2239-649 (Sumida)
7BRS-9286A (Toko)
13. The variations (especially in case of small coupling coefficient) in the oscilation coil may cause a parasitic oscillation of
approximately 100 MHz to occur at the local oscillation buffer output (pin 20) at low temperatures. In this case, connect a
capacitor of 30 pF or greater across pin 20 and GND. (When the oscillation coil is used with no tap, no problem arises.)
14. The recommended double-tuning circuit has a loose coupling at 2T. Therefore, the change in the total number of turns may
affect the coupling coefficient subtly, causing a tight coupling and making the selectivity characteristic double-humped.
Especially for a receiving band of 1400 kHz or more, the tracking method may affect the band characteristic of sensitivity
and the cross modulation characteristic considerably. When making a design, check to see if critical coupling occurs or not.
15. Sensitivity difference at 600 kHz or less
In the application circuit configuration shown below, the bypass capacitor in the position where the tuning voltage is applied
and coupling L for double-tuning may cause an antiresonance point of 400 kHz to 600 kHz depending on the variations in
the coil, varactor diode, etc. The value of the bypass must be 0.047 µF or greater. The recommended value is 0.1 µF.
Unit (resistance: Ω, capacitance: F)
No. 1272-8/18
LA1135, 1135M
W.B.AGC-ON level – dBµ
16. Measure against suppression of sensitivity in the presence of an undesired signal of high strength
(Sample application where two PIN diodes are used in the antenna damping circuit)
The LA1135 contains the wide-band AGC circuit (wide-band AGC with pin 2 input) against cross modulation which occurs
because an undesired signal of high strength distorts the FET input. The AGC = ON level depends on the value of external
resistor R3 as shown below.
Test conditions
Double-tuning
ANT input level
at which ANTD is turned ON when
fu = 1.4 MHz is inputed at fr = 1 MHz
Resistor value, R – Ω
When a nonlinear element, such as transistor, is used for antenna damping, cross modulation which occurs when the transistor is
turned ON is as shown below.
Cross Modulation Characteristics
Cross modulation characteristic which is caused
by the ANT Tr when the
LA1135 wide-band
AGC-ON level (with
pin 2 input) is varied
Wide-band AGC (pin 2 input)75Ω
Output – dB
Doubletuning
Desired:1.0 MHz 400 Hz 30% mod 74 dBµ
Undesired: 1.4 MHz non-mod
Desired: 1.0 MHz 400 Hz
non-mod 74 dBµ
Undesired: 1.4 MHz 1 kHz
80% mod
Cross modulation which occurs when the
transistor for ANT damping is turned ON
Unit (resistence: Ω, capacitance: F)
Undesired input – dBµ
The dynamic range of the FET input covers up to approximately 110 dBµ of antenna input, but the AGC-ON level must be set
lower because of the bad effect shown above.
Therefore, there are some cases where it is difficult to receive a desired signal of low strength in the presence of an an undesired
signal of high strength. To solve this problem, a sample application circuit where two PIN diodes with good linearity are used for
antenna damping and its cross modulation characteristic are shown below.
Sample Application Circuit where two PIN diodes are used for ANT damping
Equivalent capacitance available
(Capacitance is desirable because
of a slight change in ANT damping
in the band)
(Approximately 3000 pF)
Doubletuning
Unit (resistance: Ω, capacitance: F)
No. 1272-9/18
LA1135, 1135M
Cross Modulation Characteristics
Application where two PIN diodes are used for ANT damping
Output – dB
Desired: 1.0 MHz fm = 400 Hz 30% mod
Undesired: 1.4 MHz non-mod
Desired: 1.0 MHz non-mod
Undesired: 1.4 MHz fm = 1 kHz 80% mod
Pin 2 input W.B.AGC
External pickup R3 = 5 Ω
Undesired input – dBµ
17. For details of the LA1135 wide-band AGC, refer to Technical Data No.79.
External Parts
(1) RF double-tuning coil
Primary
YT-30020 (Mitsumi) 2157-2239-518A (Sumida) 7BRS-8934A (Toko)
1–2
2T
2T
2T
6–4
37T
40T
35T
2–3
82T
90T
75T
Secondary
YT-30018 (Mitsumi) 2157-2239-517A (Sumida) 7BRS-8932A (Toko)
1–2
2T
2T
2T
6–4
15T
16T
14T
2–3
82T
90T
75T
(2) OSC coil
YT-30008 (Mitsumi) 2157-2239-516 (Sumida) 7BR-5941Y (Toko)
1–2
29T
34T
29T
2–3
29T
35T
29T
High selectivity type
(3) IFT (I)
CFMA-027 (Toko)
1–2
69T
2–3
77T
4–6
14T
Center frequency 450 kHz
Qu = 115 ± 20%
Tuning capacitance 180 pF
YT-30042 (Mitsumi)
+SFP450H (Murata)
1–2
49T
4–6
27T
2–3
103T
Center frequency 450 kHz
Qu = 45 ± 20%
Tuning capacitance 180 pF
No. 1272-10/18
LA1135, 1135M
(4) IFT (II)
YT-30007 (Mitsumi)
4140-1289-164 (Sumida)
7MC-6272N (Toko)
1–2
115T
111T
110T
4–6
6T
6T
6T
2–3
37T
36T
36T
Center frequency 455 kHz, Center frequency 455 kHz Center frequency 455 kHz,
Qu = 110%
Qu = 110%
Qu = 110%
Tuning capacitance 180 pF Tuning capacitance 180 pF Tuning capacitance 180 pF
(5) Varactor diode: SVC321
(6) FET at RF stage:
2SK315 F, G
2SK427 T, U
(7) Transistor for AGC
FET AGC: 2SC536 F, G
ANT damping: 2SC930 E
Overall Characteristics
VSM – V
IF interference
Wide-band AGC cutoff
Signal characteristic
fr = 900 kHz fm = 400 Hz 30% mod
Input at 20 dB S/N
Input at –25 dBm output
Total harmonic distortion, THD – %
Tweet Input Characteristics
Image frequency
interference
M.S., Q.S. – dBµ
Input voltage – dBµ
Output – dBµ
Tracking at each point
THD – %
Output – dBm
Detection output at 30% mod
Band Characteristics
Complete tuning
(Beat max. at
900 kHz tuning)
Complete tuning
(Zero beat)
ANT input – dBµ
IF interference, image frequency interference, S/N–74 – dB
(8) Narrow-band resonator BFU450CN Murata
Receiving frequency, fr – kHz
No. 1272-11/18
LA1135, 1135M
Detuning Characteristics
Spurious Characteristics
Difference in input at –25 dBm output
Output – dBµ
Detection output, VO-74 – dBm
Vary VT so that
tweet output is
maximized at each
point.
Detection output 30% mod
Input: 74 dBµ
Distortion
Selectivity – dB
fm – Hz
Selectivity Characteristics
Modulation – %
Detuning Characteristics
Detection output 30% mod
Frequency deviation, ∆f – kHz
Detuning Characteristics
Output – dBm
W.B.AGC
operation
Difference in
input at –25 dBm
output
S meter output, VSM – V
Detection output
THD – %
Output – dBµ
Receiving frequency, fr – Hz
Detection Output, THD – Modulation Characteristics
Output – mVrms
Total harmonic distortion, THD – %
Frequency deviation, ∆f– kHz
THD – fm
Noise
Using narrow-band filter
Frequency deviation, ∆f – kHz
Frequency deviation, ∆f – kHz
No. 1272-12/18
LA1135, 1135M
Detection output
Input: 130 dBµ
S meter output, VSM – V
Output, VO – dBm
Detection output-Input: 74 dBµ
VSM – VCC
Total harmonic distortion, THD – %
VO, THD – VCC
Using narrow-band filter
Supply voltage, VCC – V
ICC – VCC
Supply voltage, VCC – V
∆f – VCC
Quiescent
Quiescent
Quiescent
Supply voltage, VCC – V
VOSC – VCC
Frequency deviation, ∆f – kHz
Current drain, ICC – mA
OSC coil 1/2 tap
Supply voltage, VCC – V
VOSC – mV
OSC coil 1/2 tap
Supply voltage, VCC – V
No. 1272-13/18
LA1135, 1135M
Ambient temperature, Ta – °C
Maximum sensitivity, MS – dBµ
Usable sensitivity (Input at 20 dB S/N)
VOSC – mVrms
S/N–74 – dB
VO-74 – dBm
Total harmonic distortion, THD – %
Current drain, ICC – mA
VAGC-0 – V
VSM = 1V input – dBµ
S meter output,
–V
VSM-130, VSM-47
ANT D ON input – dBµ
W.B.AGC ON input – dBµ
VSM = 1 V
input
Usable sensitivity, Q.S. – dBµ
Temperature Characteristics
Temperature Characteristics
Ambient temperature, Ta – °C
Cross Modulation Characteristics Testing Method
Output
2-signal pad JIS Dummy ANT
Desired signal ANT input
Desired signal ANT input
Unit (resistance:Ω, capacitance: F)
A: Desired signal 80 dBµ 400 Hz 30% mod.
The strength of an undesired signal
(non-mod) causes the desired signal to
be suppressed.
B: Desired signal 80 dBµ non-mod.
The strength of an undesired signal (400
Hz 80% mod) causes interference to
occur.
Solid line —— Interference
Dotted line ---- No interference
No. 1272-14/18
LA1135, 1135M
Cross Modulation Characteristics
Desired 1.4 MHz
400 Hz
30% mod
Undesired 1.44 MHz
non mod
Desired input 90 dBµ
Desired input 80 dBµ
Output – dBµ
Desired input 40
dBµ
Output – dBµ
Desired 1.0 MHz
400 Hz
30% mod
Undesired 1.4 MHz
non mod
Cross Modulation Characteristics
Desired 1.0 MHz
non mod
Undesired
1.4 MHz
400 Hz
80% mod
Undesired input – dBµ
Desired input 40 dBµ
Desired 1.4 MHz
non mod
Undesired
1.44 MHz
400 Hz
80% mod
Undesired input – dBµ
No. 1272-15/18
LA1135, 1135M
Specification for LA1135 loop ANT
(1) Features of specification for LA1135 loop ANT
1) Excellent high-input characteristic
The antena damping circuit prevents the antena circuit from being magnetic-saturated, which results in worsened
characteristic, at a high input.
2) Excellent cross modulation characteristic
(2) Application circuit
DC voltmeter
Distortion meter
Valve voltmeter
HF valve voltmeter
Unit (resistance: Ω, capacitance: F)
(3) Circuit configuration and connection
3-1 Circuit configuration
Unit (resistance: Ω, capacitance: F)
3-2 Connection (bottom view)
No. 1272-16/18
LA1135, 1135M
3-3 Pin name
Pin No.
Pin Name
Pin No.
Pin Name
1
Loop ANT
6
NC
2
Loop ANT
7
NC
3
RF AMP GND side
8
Local OSC
4
NC
9
RF output
5
NC
10
Tuning voltage
11
Local OSC
(4) Specification
Receiving frequency band
MW BAND
Tuning voltage
1 to 9 V
Loop ANT
42579719100 (LA-1500), 4257976000 (LA-100A) (Korin)
IC
LA1135
Overall Characteristics
Band Characteristics
IF interference
THD – %
VSM – V
Output – dBµ
Output – dBµ
Detection output at 30% mod
Image frequency interference
S/N 20 dB sensitivity
Input voltage – dBµ
Input at VO = –25 dBm
Detection Output, THD – Modulation Degree
Modulation degree – %
THD – %
VOSC – mW
Detection output VO
THD – %
Output – mV
Input 74 dBµ
Receiving frequency – kHz
No. 1272-17/18
LA1135, 1135M
Input 74 dBµ
Supply voltage, VCC – V
Frequency deviation, ∆f – kHz
Frequency deviation – kHz
∆f – VCC
VOSC – mW
Frequency deviation – kHz
VOSC – VCC
Input 74 dBµ
Output – dBµ
Detection output
Selectivity Characteristics
Selectivity – dB
Detuning Characteristics
Supply voltage, VCC – V
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. 1272-18/18
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