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参数资料
| 型号： | LA2010 |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PSIP9 |
| 封装： | SIP-9 |
| 文件页数： | 3/9页 |
| 文件大小： | 123K |
| 代理商： | LA2010 |
LA2010
No.1343-3/9
Description of external parts
C1 :
Input coupling capacitor
Capacitor used for coupling with preceding preamp. Characteristics at the time of application of power
considered, the capacitance value of C1 must not exceed that of C3 on pin 3. 0.047
μF (polyester film
capacitor) is recommended. R1, R2 are used to adjust the input level. Pin 1 is high in input imedance ; in
order to be free from external effect, R2 must not exceed 10k
Ω and must be grounded.
C2, R3 : For setting interprogram space detect time (TD)
By selecting proper C2 and R3, your desired TD can be obtained.
TD = 1.34
×C2 R3 (s)
It is recommended to use R3 of 150k
Ω to 500kΩ.
It is recommended to use C2 of 0.22
μF (polyester film capacitor).
C3 :
NF capacitor
Lower cut-off frequency fL depends on this capacitor.
fL =
1
0.3
πC3 (μF)
……… (kHz)
Assuming C3 = 0.47
μF, fL = 2.2kHz is obtained. If the capacitance value of C3 is increased, fL lowers,
thereby being subjected to the effect of the variations in preamp. Further, since the time that elapses
between the moment VCC is applied and the moment the circuit is stabilized becomes longer, the reset time
must be made longer accordingly. Therefore, it is recommended to use C3 of 0.47
μF.
C4, R4 : For setting recorded area detect time (TS)
The presence or absence of a program (input signal) is checked by the time setting determined by C4, R4 as
follows :
For recorded area TS < TI + TD
For unrecorded area TS > TI + TD
The recorded area detect time is set by :
TS = C4 (
μF) R4 (kΩ) (ms)
Therefore, if the recorded area detect time (TS) is longer than
the input signal time (TI) + the unrecorded area detect time (TD),
no program is present. The resistance value of R4 must be 50k
Ω
to 200k
Ω ; it is recommended to use R4 of 100kΩ. The
capacitance value of C4 must not exceed 4.7
μF ; it is
recommended to use C4 of 1
μF to 3.3μF.
C5 :
For setting reset time
Capacitor used to set the time for initializing the circuit at the time of application of power. The reset pulse
is generated for a certain period of time [TR = 14.4 C5 (
μF) (ms) ] that is set each time power is applied.
C6, R5 : For power ripple filter.
TD
INPUT
pin6
TD
INPUT
pin2
pin4
TI
TS
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