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參數(shù)資料
| 型號(hào)： | LA3410 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories(帶FM附件VCO無需調(diào)整PLL FM MPX立體聲解調(diào)器) |
| 中文描述： | 壓控振蕩器非盈豐調(diào)整鎖相環(huán)調(diào)頻立體聲調(diào)頻解調(diào)器與配件（帶調(diào)頻附件壓控振蕩器無需調(diào)整盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器） |
| 文件頁數(shù)： | 5/13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 V
S
and limiting resistor R
S
.
The relation between V
S
and R
S
is shown in Fig. 10. When in the VCO stop mode, the value of R
S
must be set so
that the voltage on pin 11 is within the specified range (min=5.5V, max=V
CC
–3V). For example, it is seen from
Fig.10 that the value of limiting resistor R
S
is approximately 2.2k
when the voltage on pin 11 is set to 6V at
V
S
=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= F0–F1
×
100 [%]
F1
F0 : Free-running frequncy
F1 : Lock frequency when the input frequency is varied
F0–456
456
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