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參數(shù)資料
| 型號： | LA3410 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LA3410 |
LA3410
No.1407–5/13
(2) VCO stop method
(a) Addition of diode (small-signal silicon diode)
Diode D1 is additionally connected across pins 11 and 15 as shown in
Fig. 2. In this case, the use of nonpolarized capacitors for C9, C10 across
pins 14 and 15 involves no problem (pin 15 : + polarity).
(Note) When D1 is connected across pins 11 and 14, stereo start time may
be 2 to 3 seconds late as compared with the application in Fig. 2.
(b) Setting of external voltage VS and limiting resistor RS.
The relation between VS and RS is shown in Fig. 10. When in the VCO stop mode, the value of RS must be set so
that the voltage on pin 11 is within the specified range (min=5.5V, max=VCC–3V). For example, it is seen from
Fig.10 that the value of limiting resistor RS is approximately 2.2k when the voltage on pin 11 is set to 6V at
VS=12V.
2. Checking of free-running frequency
Since no pin is provided for checking the free-running frequency, the free-running
frequency is checked through a burrer amplifier with a high input impedance, low
input capacitance connected to pin 16. Fig. 3 shows a sample circuit configuration.
The frequency measured in this circuit configuration is 456kHz or thereabouts. The
frequency in 19kHz equivalent can be obtained by dividing this measured value by 24.
The wiring across pin 16 and the buffer amplifier input must be made as short as
possible (within 1cm).
3. Ceramic resonator
Ceramic resonators other than specified cannot be used in applications of the LA3410. The Type No., manufacturer of
the ceramic resonators specified are shown below. For particulars about the ceramic resonator, contact the mamufacturer.
Type No.
Manufacturer
CSB456F11
Murata
KBR-457HS
Kyocera
4. Capture range and PLL loop filter constants
(1) Definition of capture range
Since the VCO of the LA3410 is adjustment-free, the capture range is defined by the following formula with the
deviation of the free-running frequency from the pilot signal considered.
Capture range C. R=
–
× 100 [%]
F0 : Free-running frequncy
F1 : Lock frequency when the input frequency is varied
F0–F1
F1
F0–456
456
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