Ordering number : EN2650B Monolithic Linear IC LA1060 Antenna Switching Diversity Circuit for Car-Use FM Tuners Functions Package Dimensions • Noise amp, noise AGC circuit, noise density circuit. • Antenna switching trigger output circuit. • Antenna switching T flip-flop circuit. • Antenna holding function to be used at weak input signal reception mode, forced antenna holding function. unit: mm 3017B-SIP9 [LA1060] Features • "Count system"-used, reliable detection of multipath distortion. • One-tuner type diversity system allowing cost reduction of sets. • The output to hold the antenna at the weak input signal mode and the output (antenna switching trigger output) to indicate that the antenna switching frequency is high are delivered at the same pin, allowing a wide variety of applications according to the design concept of set. SANYO: SIP9 Specifications Maximum Ratings at Ta=25°C Parameter Maximum supply voltage Maximum flow-out Maximum flow-in current Allowable power dissipation Symbol Conditions Ratings VCC max I4 max Unit 16 V 1 mA I6 max 2 mA I7 max 10 mA I8 max 10 mA I6 max Pd max Ta≤75°C 10 mA 200 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +125 °C Operating Conditions at Ta=25°C Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings Unit 8 V 6.5 to 15 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 82997HA (KT)/7119YT/D147TA/N196AT, TS No.2650-1/8 LA1060 Electrical Characteristics at Ta=25°C, VCC=8.0V, f=100kHz sine wave Parameter Symbol Current drain ICC Conditions No input, not including pins Ratings Unit min typ max 3.8 4.9 6.0 mA 7, 8 current Pin 7 high voltage V7H Pin 7-GND resistance=1kΩ 5.0 6.0 7.0 V Pin 8 high voltage V8H Pin 8-GND resistance=1kΩ 5.0 6.0 7.0 V Noise amp gain VG1 Input=3mVrms *1 33 36 39 dB VG2 Input=100mVrms *1 10 13 16 dB 9 12 15 mVrms Noise detection sensitivity NDS Noise AGC=OFF Input signal level at which the output at pins 7, 8 starts to be inverted *2 Number of noise counts NCN Input=30mVrms 10 Number of sine waves which causes the output at pins 7, 8 to be inverted *2 Gate time tG Noise AGC=OFF 100 120 140 µs Repetitive period of pin 4 waveform Pin 6 voltage V6 Input=100mVrms *3 1.6 2.0 2.5 V Antenna holding HLD Input=100mVrms, noise AGC=OFF 5.0 6.0 7.0 V Pin 8 output voltage *4 Note *1 : S1=OFF S2=OFF S3=ON *2 : S1=OFF S2=ON S4=OFF S5=OFF S3=OFF S4=ON S5=OFF *3 : S1=OFF S2=OFF S3=OFF S4=ON S5=OFF *4 : S1=OFF S2=ON S5=ON S3=OFF S4=ON Pin Assignment No.2650-2/8 LA1060 AC Characteristics Test Circuit Diagram Unit (resistance : Ω, capacitance : F) Block Diagram Unit (resistance : Ω, capacitance : F) No.2650-3/8 LA1060 Sample Application Circuit 1 When the SW is placed in the 300kΩ position, the antenna is held on the pin 8 side at the weak input signal mode. When the SW is placed in the 10kΩ position, the antenna holding function at the weak input signal mode does not work. Unit (resistance : Ω, capacitance : F) Circuit to cause the separation control at the MPX stage to be entered into the forced monaural mode when the antenna switching frequency is high. The antenna switching trigger pulse at pin 6 is peak-held, integrated, and attacks the separation control pin. Component Placement Diagram R1, Q1, R5, R10, R11 are connected to the Cu-foiled side. (Because no holes are made.) No.2650-4/8 LA1060 Noise Detection Method of the LA1060 (1) "Count system"-used noise detection • The LA 1060 is so designed as to count the noise components of 100kHz or greater in the IF output to detect the multipath distortion. • Car-use FM tuners are always affected by noises shown below. (1) Ignition noise (2) Noise attendant on modulation. The actual modulation signal is not a continuous wave, but an intermittent signal. When the modulation signal rises in a burst fashion, the high frequency noise components are detected in the FM demodulation output (because in a burst fashion, overmodulation may occur or the signal rise characteristic may include the high frequency components.) (3) Random noise The random noise at the weak input signal mode includes some noise components whose peak value is two to three times as high as the average noise level. • As a result of checking the above-mentioned noises, we found that the noise of more than a given level being present within a given period of time (example : within 100µs) is included in the FM demodulation output of caruse FM tuners at less than a given density only. • By contrast, when the multipath distortion or skip noise occurs, the continuous noise components occur and the above-mentioned noise density increases. • Therefore, by using "count system" to count the noise density, the detection of multipath distortion and skip noise detection can be performed with less malfunction. (2) Noise detection time • It is desirable that the noise detection time is faster (Note 1). However, the noise detection time (noise count time) of the LA1060 is approximately 100µs so that the above-mentioned three types of noise cause no malfunction to occur. (Note 1) • If the period of noise duration is 20µs or less, the noise is hardly offensive to the ears. If the period of noise duration is 50 to 200µs, the noise is heard as a sound "buzz", but a single noise is hardly offensive to the ears. • If the period of noise duration is 500µs or more, the noise is heard as a sound "zah" which is offensive to the ears. Sample Application Circuit 2 Unit (resistance : Ω, capacitance : F) No2650-5/8 LA1060 Sample Application Circuit 3 Pin 6 voltage, V6 – V Pin 3 voltage, V3 – V Voltage gain, VG – dB Unit (resistance : Ω, capacitance : F) Pin 1 input voltage, V1IN – dBµ Voltage gain, VG – dB Pin 8 voltage, V8(High) – V Pin 1 input voltage, V1IN – dBµ Frequency, f – Hz Resistance, R8 – Ω No.2650-6/8 Gate time, tG – µs Gate time, tG – µs LA1060 Resistance, R – kΩ Pin 6 voltage, V6 – V Voltage gain, VG – dB Pin 4 capacitance, C4 – nF Ambient temperature, Ta – °C Voltage gain, VG – dB Pin 6 voltage, V6 – V Ambient temperature, Ta – °C Supply voltage, VCC – V IF OUT noise output (LA1140) – mV H.P.F OUT noise output (LA2110 Pin 10) – mV Supply voltage, VCC – V Tuner input – dBµ Tuner input – dBµ No.2650-7/8 Pin 3 (AGC) voltage, V3(AGC) – V LA1060 Tuner input – dBµ Note for Application 1. Noise sensitivity setting When the LA1060 is used in conjunction with the LA2110, it is unnecessary to adjust the sensitivity. However, if any malfunction occurs, increase the noise sensitivity control VR form 0Ω to 50kΩ—100kΩ to decrease the input noise level. 2. Gate time setting The recommended gate time is 120µs. If any malfunction occurs, shorten the gate time, and less malfunction will result. If the gate time is made longer, the multipath distortion detection sensitivity is increased. The gate time can be set by varying the value of the capacitor or resistor connected to pin 4. 3. Antenna holding function a. To hold the antenna at the weak input signal mode, set the value of the resistor connected to pin 6 to approximately 300kΩ. In this case, the pin 8 output is brought to High level. The antenna input level at which the antenna is held can be adjusted by varying the value (300kΩ) of the resistor. b. To switch the antenna even at the weak input signal mode, set the value of the resistor connected to pin 6 to approximately 10kΩ. 4. Forced antenna holding Set the pin 6 voltage to 2.5V or greater (example : connect to VCC through 10kΩ), and the antenna can be held on the pin 8 side, 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 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 August, 1997. Specifications and information herein are subject to change without notice. No.2650-8/8