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參數資料
| 型號： | LA1835 |
| 元件分類： | 調諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PDIP30 |
| 封裝： | SDIP-30 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 468K |
| 代理商： | LA1835 |
Continued from preceding page.
No. 4159-7/14
LA1835
No.
Function
Voltage
Internal equivalent circuit
Note
20
21
22
23
24
25
26
27
MPX outputs
Left and right outputs
MPX input
MPX VCO
AM/FM demodulator
output
AM low cut
AMAGC
AM RF input
3.5
2.9
3.5 (FM)
0 (AM)
2.9 (FM)
3.0 (AM)
2.9 (FM)
3.0 (AM)
0 (FM)
0.5 (AM)
Vreg
Output impedance ro = 3.3 k
Pin 20: left de-emphasis
Pin 21: right de-emphasis
Input impedance ri = 20 k
Increasing the value of the external capacitor
connected between this pin and pin 24 improves
the low frequency separation characteristics.
However, the impulse noise associated with
switching between AM and FM also increases.
Recommended ceramic oscillator: CSB456F15
(Murata Mfg. Co., Ltd.)
Output impedances
FM: ro = 250
AM: ro = 10 k
The separation can be adjusted by changing the
value of the external capacitor connected between
this pin and ground.
The low-band frequency characteristics of the AF
demodulator can be adjusted by changing the value
of the external capacitor connected between this
pin and ground. The AM detector output can be
attenuated by adding a resistor in series with the
capacitor.
The internal load resistance, R is 6.7 k
.
Pin 27 must be used at the same voltage as pin 4,
the regulator voltage.
Continued on next page.
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