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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)： | 5/48頁 |
| 文件大小： | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-13/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
39
Keyed AGC
AM stereo buffer
The keyed AGC operates when the
voltage created by dividing the pin 24
S-meter output voltage by the 6.4 and
3.6k
Ω resistors becomes lower than
the voltage determined by the resistor
between pin 39 and ground.
This pin also is used as the AM stereo
IF buffer pin.
24
39
+
--
KEYED
AGC
S-meter
6.4k
Ω
3.6k
Ω
Comparator
1.3V
50pF
150
Ω
90
μA
VCC
AM IF out
41
HCC capacitor
The HCC frequency characteristics
are determined by the external
capacitor connected at this pin.
41
+
2200pF
20k
Ω
20k
Ω
VCC
42
AM L.C. pin
This pin is used to change the
frequency characteristics of the
unneeded audio band under 100Hz in
AM mode to produce a clear audio
signal.
Note : The LC capacitor must be
connected between this pin
and VCC (pin 40).
This is because the detector
circuit operates referenced to
VCC.
The cutoff frequency fC is determined
by the following formula.
fC = 1/2π × 50kΩ × C
42
+
--
DET
VCC
C
50k
Ω
50k
Ω
1k
Ω
1k
Ω
43
Pilot detector
Inserting a 1M
Ω resistor between pin
43 and VCC will force the IC to mono
mode.
+
43
+
VCC
30k
Ω
30k
Ω
30k
Ω
19kHz
∠0°
BIAS
1
μF
Continued on next page.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LA1781MA-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: |
| LA1781MD-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays |
| 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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