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參數(shù)資料
| 型號： | LA1781M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | 14 X 14 MM, QIP-64 |
| 文件頁數(shù)： | 8/48頁 |
| 文件大小： | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-16/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
54
49
Mixer output : 130
μA
Mixer input
The mixer coil connected to the pin 54
mixer output must be wired to VCC
(pin 40).
The pin 49 mixer input
Impedance is 330
Ω
54
49
OSC
Pin 40 VCC
330
Ω
55
58
W-AGC IN
AM SD ADJ
N-AGC IN
Muting attenuation
adjustment pin
Pins 55 and 58 include built-in DC cut
capacitors.
The AGC on level is determined by
the values of the capacitors C1 and
C2.
Pin 55 functions as the SD sensitivity
adjustment pin in AM mode.
The output current I55 is 50
μA, and
V55 varies depending on the value of
the external resistor.
The SD function operates by
comparing V55 with the S-meter
voltage.
55
58
+
--
W-AGC
N-AGC
Pin 62
VCC
30pF
50pF
50
μA
Signal meter
AM SD
C1
C2
MIX
IN
MIX
OUT
59, 60
63, 64
Mixer output
Mixer input
Double balanced mixer.
Pins 59 and 60 are the mixer
10.7MHz output
Pins 63 and 64 are the mixer input.
This is an emitter insertion type
circuit, and the amount of insertion is
determined by the capacitors C1 and
C2.
Note :The lines for pins 63 and 64
must be kept separated from
the lines for pins 59 and 60.
59
60
63
O S C
64
1ST.IF
30
Ω
VCC
C1
C2
5pF
RF AMP
620
Ω
620
Ω
VCC
Continued on next page.
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相關代理商/技術參數(shù) |
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|---|---|
| LA1781M_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
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| LA1781MD-B-MPB-E | 功能描述:調(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| LA1781ML-MPB-E | 功能描述:調(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
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