LA1845N Datasheet, PDF (5/10 Pages) Sanyo Semicon Device – Single-Chip Home Stereo IC

Continued from preceding page.
Pin No.
Pin function
Pin voltage
Pilot detector low-
12
pass filter (Forced VCC – 1.0
mono) (VCO stop)
LA1845N, 1845NM
Notes
The device is forced to monaural when a current of
over 50 µA flows from this pin.
The VCO is stopped when a current of over 200 µA
flows from this pin.
The limit values for the resistor are the same as
those for pin 11.
Equivalent circuit
12
A10642
13
L outputs
14
R outputs
3.2 V
3.2 V
Output impedance r_o = 3.3 kΩ
15
Pilot canceler
output
Vreg
16
Decoder input
Vreg
Inverting input pin
RNF = 20 kΩ
13
( 14 )
A10647
15
3
A10645
RNF
16
17
PLL input
Vreg
Input impedance ri = 20 kΩ
Output impedance r_o = 2.3 kΩ
18
FM demodulator
output
Vreg + 0.7 (FM)
Vreg + 0.7 (AM)
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
19
AM detector
output
0 V (FM)
1.5 V (AM)
Output impedance r_o = 10 kΩ
S meter,
20
AM AGC
0.2 V (FM)
0.9 V (AM)
The resistance of the built-in resistor R is 13.9 kΩ
The SD responce during seek operation is
determined with the external capacitor connected
to this pin.
17
18
100V
19
A10649
20
R
A10651
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No. 5888-5/10