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