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Ordering number : EN2650B
Monolithic Linear IC
LA1060
Antenna Switching Diversity Circuit for Car-Use FM Tuners
Functions
* 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.
Package Dimensions
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=25C
Parameter Maximum supply voltage Maximum flow-out Symbol VCC max I4 max I6 max I7 max I8 max Maximum flow-in current Allowable power dissipation Operating temperature Storage temperature I6 max Pd max Topr Tstg Ta75C Conditions Ratings 16 1 2 10 10 10 200 -20 to +75 -40 to +125 Unit V mA mA mA mA mA mW C C
Operating Conditions at Ta=25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 8 6.5 to 15 Unit V V
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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=25C, VCC=8.0V, f=100kHz sine wave
Parameter Current drain Pin 7 high voltage Pin 8 high voltage Noise amp gain Noise detection sensitivity Symbol ICC V7H V8H VG1 VG2 NDS Conditions No input, not including pins 7, 8 current Pin 7-GND resistance=1k Pin 8-GND resistance=1k Input=3mVrms *1 Input=100mVrms *1 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 Number of sine waves which causes the output at pins 7, 8 to be inverted *2 Gate time Pin 6 voltage Antenna holding tG V6 HLD Noise AGC=OFF Repetitive period of pin 4 waveform Input=100mVrms *3 Input=100mVrms, noise AGC=OFF Pin 8 output voltage *4 Note *1 : S1=OFF S2=OFF S3=ON *2 : S1=OFF S2=ON *4 : S1=OFF S2=ON S4=OFF S5=OFF S5=OFF S5=OFF S5=ON S3=OFF S4=ON S3=OFF S4=ON 1.6 5.0 2.0 6.0 2.5 7.0 V V 100 120 140 s 10 5.0 5.0 33 10 9 6.0 6.0 36 13 12 7.0 7.0 39 16 V V dB dB Ratings min 3.8 typ 4.9 max 6.0 Unit mA
15 mVrms
*3 : S1=OFF S2=OFF S3=OFF S4=ON
Pin Assignment
No.2650-2/8
LA1060 AC Characteristics Test Circuit Diagram
Unit (resistance : , capacitance : F)
Block Diagram
Unit (resistance : , capacitance : F)
No.2650-3/8
LA1060 Sample Application Circuit 1
When the SW is placed in the 300k position, the antenna is held on the pin 8 side at the weak input signal mode. When the SW is placed in the 10k position, the antenna holding function at the weak input signal mode does not work.
Unit (resistance : , 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 100s) 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 100s so that the above-mentioned three types of noise cause no malfunction to occur. (Note 1) * If the period of noise duration is 20s or less, the noise is hardly offensive to the ears. If the period of noise duration is 50 to 200s, 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 500s or more, the noise is heard as a sound "zah" which is offensive to the ears.
Sample Application Circuit 2
Unit (resistance : , capacitance : F) No2650-5/8
LA1060 Sample Application Circuit 3
Unit (resistance : , capacitance : F)
Voltage gain, VG - dB
Pin 3 voltage, V3 - V Pin 1 input voltage, V1IN - dB
Pin 6 voltage, V6 - V
Pin 1 input voltage, V1IN - dB
Pin 8 voltage, V8(High) - V
Voltage gain, VG - dB
Frequency, f - Hz
Resistance, R8 -
No.2650-6/8
LA1060
Gate time, tG - s
Pin 4 capacitance, C4 - nF
Gate time, tG - s
Resistance, R - k
Voltage gain, VG - dB
Pin 6 voltage, V6 - V
Ambient temperature, Ta - C
Ambient temperature, Ta - C
Voltage gain, VG - dB
Supply voltage, VCC - V H.P.F OUT noise output (LA2110 Pin 10) - mV
Pin 6 voltage, V6 - V
Supply voltage, VCC - V
IF OUT noise output (LA1140) - mV
Tuner input - dB
Tuner input - dB
No.2650-7/8
LA1060
Pin 3 (AGC) voltage, V3(AGC) - V
Tuner input - dB
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 0 to 50k--100k to decrease the input noise level. 2. Gate time setting The recommended gate time is 120s. 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 300k. 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 (300k) 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 10k. 4. Forced antenna holding Set the pin 6 voltage to 2.5V or greater (example : connect to VCC through 10k), 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

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