參數(shù)資料
型號: LA17000M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80
封裝: 14 X 14 MM, QFP-80
文件頁數(shù): 29/54頁
文件大?。?/td> 830K
代理商: LA17000M
LA17000M
No. 6522-35/54
Continued from preceding page.
Pin No.
Function
Equivalent circuit
Description
46
Noise canceller input
47
AM/FM detection
output
48
IF S-meter output and
MRC DC input pin
49
Mute driver output
A13346
A13347
Continued on next page.
FM
detec-
tion
output
AM
detec-
tion
FM S-meter output block
MRC AC input block
Adjust an external 1-k
resistor to
attenuate and control the MRC AC
input.
A13348
1) The mute time constant is
determined by an external CR as
follows:
Attack time
TA = 10 k
× C1
Release time
TR = 50 k
× C1
2) Noise convergence adjustment
Fine adjustments can be made
when there is no input to the ANT
input by inserting a resistor
between pin 49 and GND.
3) Mute off function
Short pin 49 with GND using a
4-k
resistor.
Pin 46: N.C. input
Input impedance 50 k
Pin 47: AM.FM detection output
For FM: Low impedance
For AM: 10 k
output
To improve low-band separation, use
a coupling capacitor of at least 10
.
SD circuit
BAND
MUTE
MRC input
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