LA1844

Manufacturer Part NumberLA1844
DescriptionSingle chip tuner IC
ManufacturerSanyo Semiconductor Corporation
LA1844 datasheet
 


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Continued from preceding page.
Pin voltage
Pin No.
Function
(V)
12
Pilot detector
V CC -1.0
low-pass filter
(Forced mono)
(VCO stop)
13
L outputs
3.2
14
R outputs
15
Pilot canceler
Vreg
output
16
Decoder input
Vreg
17
PLL input
Vreg
18
FM demodulator
Vreg+0.7
output
19
AM detector
0 (FM)
output
1.5 (AM)
20
S meter,
0.2 (FM)
AM AGC
0.9 (AM)
LA1844,LA1844M
Equivalent circuit
The device is forced to monaural when a current of
over 50µA flows from this pin.
The VCO is stopped when a current of over 200µA
flows from this pin.
Output impedance R O = 3.3kΩ
Inverting input pin
RNF = 20kΩ
Input impedance R i = 20kΩ
Output impedance R O = 2.3kΩ
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
Output impedance R O = 3.3kΩ
The resistance of the built-in resistor R is 13.9kΩ
The SD responce during seek operation is
determined with the external capacitor connected
to this pin.
Notes
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