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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
unit : mm
SANYO : DIP20S
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 Maximum supply voltage Output voltage Input voltage Current drain Flow-out current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VO VIN ICC I18 I20 Pd max Topr Tstg Pins 8, 14 Pins 7, 10 Pin 6 Pins 7 + 8 + 10 + 14 Pin 18 Pin 20 LA1135 LA1135M Ta % 60°C, with PCB LA1135 LA1135M Conditions Ratings 16 24 5.6 41 2 2 730 660 20 to +70 40 to +80 40 to +125 Unit V V V mA mA mA mW mW °C °C °C
Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 8 7.5 to 12 Unit V 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 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 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
Signal meter output Input at signal meter output 1 V Local oscillation buffer output
3.5 18.0 320
No. 1272-2/18
LA1135, 1135M
Reference Characteristics
Parameter Usable sensitivity Wide-band AGC ON-state input Detection output variation Local oscillation variation within broadcast band Signal meter band * VO VOSC VSM-BW1 VSM-BW2 Selectivity IF interference Image frequency interference IF. R. IM. R. Symbol Q.S. Conditions Input at S/N = 20 dB (2SK315 IDDS = 11 mA) Reception 1.0 MHz quiescent Interference 1.4 MHz non-mod at input for AMT.D. ON Input 74 dBµ 130 dBµ VOSCL VOSCH 74 dBµ input, frequency at which output is reduced to 1/2 74 dBµ input, frequency at which output is reduced to 1/10 30 % mod ±10 kHz * fr = 600 kHz * fr = 1400 kHz * typ 25.0 82.0 Unit dBµ dBµ
0.2 15 ±1.5 4.5/+7 43 77.5 52.0 (63.0)
dB mVrms kHz kHz dB dB dB
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
LA1135, 1135M
Test Circuit 1
VCC = 8 V, fr = 1 MHz, fm = 400 Hz Unit (resistance: , capacitance: F) DC voltmeter
Distortion meter
Valve voltmeter VO
HF valve voltmeter
Coil T1 Varactor diode SVC321 (Sanyo) T2 T3 T4 T5 YT-30020 YT-30018 CFMA-027 YT-30007 YT-30008 (Mitsumi) (Mitsumi) (Toko) (Mitsumi) (Mitsumi)
Narrow-band filter BFU450CN (Murata)
Sample Printed Circuit Pattern
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: , capacitance: F)
Coil T1 T2 T3 T4 T5 YT-30202 YT-30018 CFMA-021A YT-30007 YT-30008 (Mitsumi) (Mitsumi) (Toko) (Mitsumi) (Mitsumi)
Varactor diode Narrow-band filter
SVC321
(Sanyo)
BFU450CN (Murata)
No. 1272-5/18
LA1135, 1135M
Proper cares in using IC
1. 2. 3. 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 16.0 MIX IF Det (dBµ)
4. 5.
28.0 45.0 61.0
How to apply input to each stage ANT stage ANT input MIX stage
IF stage
Det stage
Unit (resistance: , 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. 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. 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.
8.
9.
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 k RB = 3.0 k (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: ) 11. When using LW (approximately 50°C or greater), additionally connect a resistor of 27 k 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 k.)
Continued on next page. No. 1272-7/18
LA1135, 1135M
Continued from preceding page. Usable sensitivity, Maximum sensitivity dBµ Image frequency interference dB
Wide-band AGC OFF
Tracking at each point
Usable sensitivity S/N 20 dB
Maximum sensitivity at 25 dB output
Unit (resistance: , capacitance: F)
Receiving frequency, fr kHz
Specification for coil
YT-30202(Mitsumi) 1-3 4-6 84T 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: , capacitance: F)
No. 1272-8/18
LA1135, 1135M
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.
W.B.AGC-ON level dBµ
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 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
Desired:1.0 MHz 400 Hz 30% mod 74 dBµ Undesired: 1.4 MHz non-mod Wide-band AGC (pin 2 input)75 Desired: 1.0 MHz 400 Hz non-mod 74 dBµ Undesired: 1.4 MHz 1 kHz 80% mod
Output dB
Doubletuning
Cross modulation which occurs when the transistor for ANT damping is turned ON
Unit (resistence: , 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: , capacitance: F)
No. 1272-9/18
LA1135, 1135M
Cross Modulation Characteristics
Application where two PIN diodes are used for ANT damping Desired: 1.0 MHz fm = 400 Hz 30% mod Undesired: 1.4 MHz non-mod
Output dB
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
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) 12 64 23 2T 37T 82T 2T 40T 90T 2T 35T 75T
Secondary
YT-30018 (Mitsumi) 2157-2239-517A (Sumida) 7BRS-8932A (Toko) 12 64 23 2T 15T 82T 2T 16T 90T 2T 14T 75T
(2) OSC coil
YT-30008 (Mitsumi) 2157-2239-516 (Sumida) 7BR-5941Y (Toko) 12 23 29T 29T 34T 35T 29T 29T
(3) IFT (I)
CFMA-027 (Toko) 12 23 46 69T 77T 14T
High selectivity type
YT-30042 (Mitsumi) +SFP450H (Murata) 12 46 23 49T 27T 103T
Center frequency 450 kHz Qu = 115 ± 20% Tuning capacitance 180 pF
Center frequency 450 kHz Qu = 45 ± 20% Tuning capacitance 180 pF
No. 1272-10/18
LA1135, 1135M
(4) IFT (II)
YT-30007 (Mitsumi) 12 46 23 115T 6T 37T 4140-1289-164 (Sumida) 111T 6T 36T 7MC-6272N (Toko) 110T 6T 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 (8) Narrow-band resonator BFU450CN Murata
Overall Characteristics VSM V
Detection output at 30% mod
Tracking at each point IF interference
THD %
Wide-band AGC cutoff Image frequency interference
Input voltage dBµ Tweet Input Characteristics
Signal characteristic fr = 900 kHz fm = 400 Hz 30% mod
M.S., Q.S. dBµ
Input at 20 dB S/N
Input at 25 dBm output
Complete tuning (Beat max. at 900 kHz tuning)
Complete tuning (Zero beat)
ANT input dBµ
Receiving frequency, fr kHz
No. 1272-11/18
Total harmonic distortion, THD %
Output dBµ
IF interference, image frequency interference, S/N74 dB
Band Characteristics
Output dBm
LA1135, 1135M
Detuning Characteristics Detection output, VO-74 dBm
Vary VT so that tweet output is maximized at each point.
Spurious Characteristics
Difference in input at 25 dBm output
Frequency deviation, f kHz THD fm Total harmonic distortion, THD %
Detection output 30% mod
Output dBµ Receiving frequency, fr Hz Detection Output, THD Modulation Characteristics Output dBµ
Input: 74 dBµ
Output mVrms
Detection output
Distortion
fm Hz Selectivity Characteristics
Modulation % Detuning Characteristics
Selectivity dB
Detection output 30% mod
W.B.AGC operation Difference in input at 25 dBm output
Frequency deviation, f kHz Detuning Characteristics
Output dBm
Noise
S meter output, VSM V
Using narrow-band filter
Frequency deviation, f kHz
Frequency deviation, f kHz No. 1272-12/18
THD %
LA1135, 1135M
VO, THD VCC Detection output-Input: 74 dBµ Output, VO dBm Total harmonic distortion, THD % VSM VCC Input: 130 dBµ S meter output, VSM V
Detection output
Using narrow-band filter
Supply voltage, VCC V ICC VCC Frequency deviation, f kHz
Supply voltage, VCC V f VCC OSC coil 1/2 tap
Current drain, ICC mA
Quiescent
Quiescent Quiescent
Supply voltage, VCC V VOSC VCC
OSC coil 1/2 tap
Supply voltage, VCC V
VOSC mV
Supply voltage, VCC V
No. 1272-13/18
LA1135, 1135M
Maximum sensitivity, MS dBµ No. 1272-14/18 VOSC mVrms Ambient temperature, Ta °C Unit (resistance:, 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. S/N74 dB Temperature Characteristics VSM = 1V input dBµ S meter output, V VSM-130, VSM-47 Temperature Characteristics Usable sensitivity, Q.S. dBµ Total harmonic distortion, THD % VO-74 dBm
Usable sensitivity (Input at 20 dB S/N)
VSM = 1 V input
ANT D ON input dBµ W.B.AGC ON input dBµ
Current drain, ICC mA
Ambient temperature, Ta °C
Cross Modulation Characteristics Testing Method
2-signal pad JIS Dummy ANT
Output
Desired signal ANT input
Desired signal ANT input
Solid line ---- Interference Dotted line ---- No interference
VAGC-0 V
LA1135, 1135M
Cross Modulation Characteristics
Desired 1.0 MHz 400 Hz 30% mod Undesired 1.4 MHz non mod
Cross Modulation Characteristics
Desired 1.4 MHz 400 Hz 30% mod Undesired 1.44 MHz non mod
Desired input 80 dBµ
Desired input 90 dBµ
Desired input 40 dBµ
Output dBµ
Desired 1.0 MHz non mod Undesired 1.4 MHz 400 Hz 80% mod
Output dBµ
Desired input 40 dBµ
Desired 1.4 MHz non mod Undesired 1.44 MHz 400 Hz 80% mod
Undesired input dBµ
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: , capacitance: F)
(3) Circuit configuration and connection 3-1 Circuit configuration
Unit (resistance: , capacitance: F) 3-2 Connection (bottom view)
No. 1272-16/18
LA1135, 1135M
3-3 Pin name
Pin No. 1 2 3 4 5 Pin Name Loop ANT Loop ANT RF AMP GND side NC NC Pin No. 6 7 8 9 10 11 Pin Name NC NC Local OSC RF output Tuning voltage Local OSC
(4) Specification
Receiving frequency band Tuning voltage Loop ANT IC MW BAND 1 to 9 V 42579719100 (LA-1500), 4257976000 (LA-100A) (Korin) LA1135
Overall Characteristics
Detection output at 30% mod
Band Characteristics
IF interference
Output dBµ
THD % VSM V Output dBµ
Image frequency interference S/N 20 dB sensitivity
Input voltage dBµ Detection Output, THD Modulation Degree Input 74 dBµ
Input at VO = 25 dBm
Output mV
VOSC mW
Detection output VO
Modulation degree %
THD %
Receiving frequency kHz
No. 1272-17/18
THD %
LA1135, 1135M
Detuning Characteristics Selectivity Characteristics
Detection output Input 74 dBµ
Output dBµ
Selectivity dB
Frequency deviation kHz VOSC VCC
Input 74 dBµ
VOSC mW
Frequency deviation kHz f VCC Frequency deviation, f kHz
Supply voltage, VCC V
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