Ordering number: EN1272E
Monolithic Linear IC
LA1135, 1135M
AM Tuner System for
Car Radios and Home Stereos
Overview |
Package Dimensions |
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.
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
unit : mm
3021B-DIP20S
[LA1135]
SANYO : DIP20S
unit : mm
3036B-MFP20
Features |
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. Excellent cross modulation characteristics: Meets the |
[LA1135M] |
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requirements for preventing not only adjacent-channel |
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interference but also interference caused by all channels |
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within broadcast band. |
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. Narrow-band signal meter output: Usable as auto search stop |
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signal. Has linearity up to 80 dBµ. |
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. Local oscillation buffer output: Facilitates designing of |
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electronic tuner system, frequency display, etc. |
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. OSC (with ALC): Improves tracking error because |
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oscillation output is stabilized at a low level (380 mVrms) |
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for varactor diode. |
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. MIX: Double-balanced differential MIX meeting the |
SANYO: MFP20 |
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requirements for preventing spurious interference, IF |
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interference. |
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. Good characteristics at high input: 130 dBµ input |
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f = 400 Hz 80% mod THD = 0.4% typ |
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. Lowm |
noise: Good S/N at medium input (56 dB typ) |
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. Usable sensitivity: (S/N = 20 dB input): 25 dBµ (2SK315 |
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. 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.
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 |
Conditions |
Ratings |
Unit |
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Maximum supply voltage |
VCC max |
Pins 8, 14 |
16 |
V |
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 |
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I20 |
Pin 20 |
2 |
mA |
Allowable power |
Pd max |
LA1135 |
730 |
mW |
dissipation |
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LA1135M Ta % 60°C, with PCB |
660 |
mW |
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Operating temperature |
Topr |
LA1135 |
±20 to +70 |
°C |
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LA1135M |
±40 to +80 |
°C |
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Storage temperature |
Tstg |
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±40 to +125 |
°C |
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Operating Conditions at Ta = 25°C |
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Parameter |
Symbol |
Conditions |
Ratings |
Unit |
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Recommended supply |
VCC |
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8 |
V |
voltage |
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Operating supply voltage |
VCC op |
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7.5 to 12 |
V |
range |
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Operating Characteristics at Ta = 25°C, V CC = 8 V, fr = 1 MHz, fm = 400 Hz, See specified Test Circuit.
Parameter |
Symbol |
Conditions |
min |
typ |
max |
Unit |
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Current drain |
ICC1 |
Quiescent |
13.5 |
22.5 |
32.5 |
mA |
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ICC2 |
130 dBµ input |
20.0 |
30.0 |
41.0 |
mA |
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Detection output |
VO1 |
16 dBµ input, 30% mod |
±29.0 |
±25.0 |
±21.0 |
dBm |
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VO2 |
74 dBµ input, 30% mod |
±15.0 |
±12.0 |
±9.0 |
dBm |
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Signal-to-noise ratio |
S/N |
74 dBµ input, 30% mod |
51.0 |
56.0 |
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dB |
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THD1 |
74 dBµ input, 30% mod |
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0.3 |
1.0 |
% |
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Total harmonic distortion |
THD2 |
74 dBµ input, 80% mod |
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0.3 |
1.0 |
% |
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THD3 |
130 dBµ input, 80% mod |
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0.4 |
2.0 |
% |
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Signal meter output |
VSM1 |
Quiescent |
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0 |
0.3 |
V |
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VSM2 |
130 dBµ input |
3.5 |
5.0 |
7.5 |
V |
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Input at signal meter output 1 V |
VIN1 |
VSM = 1 V |
18.0 |
24.0 |
30.0 |
dBµ |
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Local oscillation buffer output |
VOSC BUF |
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320 |
380 |
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mVrms |
No. 1272-2/18
LA1135, 1135M
Reference Characteristics
Parameter |
Symbol |
Conditions |
typ |
Unit |
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Usable sensitivity |
Q.S. |
Input at S/N = 20 dB |
25.0 |
dBµ |
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(2SK315 IDDS = 11 mA) |
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Wide-band AGC |
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Reception 1.0 MHz quiescent |
82.0 |
dBµ |
ON-state input |
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Interference 1.4 MHz non-mod |
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at input for AMT.D. ON |
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Detection output variation |
VO |
Input 74 dBµ → 130 dBµ |
0.2 |
dB |
Local oscillation variation |
VOSC |
VOSCL ± VOSCH |
15 |
mVrms |
within broadcast band |
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Signal meter band * |
VSM-BW1 |
74 dBµ input, frequency at |
±1.5 |
kHz |
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which output is reduced to 1/2 |
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VSM-BW2 |
74 dBµ input, frequency at |
±4.5/+7 |
kHz |
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which output is reduced to 1/10 |
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Selectivity |
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30 % mod ±10 kHz * |
43 |
dB |
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IF interference |
IF. R. |
fr = 600 kHz * |
77.5 |
dB |
Image frequency |
IM. R. |
fr = 1400 kHz * |
52.0 |
dB |
interference |
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(63.0) |
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Note: *: Wide-band AGC OFF ( ): See circuit on page 7.
Allowable power dissipation, Pd max ± mW
Pd max ± Ta
with 54 × 34 × 1.7 mm3 PCB
Ambient temperature, Ta ± °C
Equivalent Circuit Block Diagram
No. 1272-3/18
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LA1135, 1135M |
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Test Circuit 1 |
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VCC |
DC voltmeter |
Unit (resistance: Ω, capacitance: F) |
Distortion |
meter |
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Valve |
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voltmeter |
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VO |
HF valve voltmeter |
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Coil |
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T1 |
YT-30020 |
(Mitsumi) |
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T2 |
YT-30018 |
(Mitsumi) |
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Varactor diode |
SVC321 |
(Sanyo) |
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T3 |
CFMA-027 |
(Toko) |
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Narrow-band filter |
BFU450CN |
(Murata) |
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T4 |
YT-30007 |
(Mitsumi) |
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Sample Printed Circuit Pattern |
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T5 |
YT-30008 |
(Mitsumi) |
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Cu-foiled area 105 × 120 mm2
No. 1272-4/18
LA1135, 1135M
Test Circuit 2
VCC
DC voltmeter
Detection output
Distortion meter
Probe load open
Unit (resistance: Ω, capacitance: F) |
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Coil |
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T1 |
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YT-30202 |
(Mitsumi) |
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T2 |
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YT-30018 |
(Mitsumi) |
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T3 |
CFMA-021A |
(Toko) |
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T4 |
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YT-30007 |
(Mitsumi) |
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T5 |
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YT-30008 |
(Mitsumi) |
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Varactor diode |
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SVC321 |
(Sanyo) |
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Narrow-band filter |
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BFU450CN |
(Murata) |
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No. 1272-5/18
LA1135, 1135M
Proper cares in using IC
1.Bias condition: RF VCC % IF VCC
2.Avoid coupling between the antenna tuning circuit and the local oscillation.
3.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.
4.For R9, use a semifixed resistor with VSM considered.
5.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 |
IF |
Det |
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16.0 |
28.0 |
45.0 |
61.0 |
(dBµ) |
How to apply input to each stage
ANT stage |
MIX stage |
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ANT input |
IF stage |
Det 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
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