參數(shù)資料
型號(hào): LA1867NM
元件分類: 接收器
英文描述: AM/FM, AUDIO DEMODULATOR, PQFP44
封裝: QIP-44
文件頁數(shù): 2/32頁
文件大?。?/td> 1074K
代理商: LA1867NM
Continued from preceding page.
No. 4619-10/32
LA1867NM
Pin
Function
Equivalent internal circuit
Note
24
AFC
25
QD OUT
26
QD IN
27
VREF
29
SD pin
30
SD sensitivity adjustment
pin
19
IF counter buffer
Seek/stop switch
R1 is the resistor that determines the band
muting bandwidth.
Increasing R1 reduces the bandwidth.
Decreasing R1 increases the bandwidth.
Null voltage
When tuned, the voltage between pins 24
and 27 will be 0 V.
V24 – V27 = 0 V
The band muting is turned on when
| V24 – V27 | ≥ 0.7 V.
The SD output for the pin 30 SD.
R determines the SD sensitivity.
Pin 23 is coupled to the muting drive output.
SD operates when the switch is off.
This pin is used for both the IF counter
buffer (AC output) and the seek/stop switch
(DC input).
It is not coupled to the SD output.
The IF buffer is turned on and off by the pin
19 DC bias level.
Pin 19: high → buffer on, low → buffer off.
Unit (resistance:Ω, capacitance:F)
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