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參數資料
| 型號： | LA1780M |
| 元件分類： | 調諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數： | 6/38頁 |
| 文件大小： | 764K |
| 代理商： | LA1780M |
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No. 5724-14/38
LA1780M
Pin No.
Function
Description
Equivalent circuit
Comparator
Quadrature
detector
IF limiter amplifier
Band
muting
Comparator
S-meter
Continued from preceding page.
Continued on next page.
The resistor R1 determines the
width of the band muting function.
Increasing the value of R1
narrows the band.
Reducing the value of R1 widens
the band.
34
AGC
35
QD output
Null voltage
36
QD input
When tuned, the voltage between
37
VREF
pins 34 and 37, V34 – 37, will be 0 V.
The band muting function turns
on when |V34 – 37| ≥ 0.7 V.
V37 = 4.9 V
A 130-A current flows from pin
38
FM SD ADJ
38 and, in conjunction with the
external resistance R, determines
the comparison voltage.
The keyed AGC operates when
the voltage created by dividing the
pin 24 S-meter output voltage by
the 6.4 and 3.6 k
resistors
39
Keyed AGC
becomes lower than the voltage
AM stereo buffer
determined by the resistor
between pin 39 and ground.
This pin also is used as the AM
stereo IF buffer pin.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA1780MA-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述:FTRAY - ANALOG CAR RADIO TUNER |
| LA1781M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
| 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:調諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數: 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 |
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