LA1845NV Datasheet, PDF (4/10 Pages) Sanyo Semicon Device – Single-Chip Home Stereo IC

Continued from preceding page.
Pin No.
Pin function
Pin voltage
10 AM/FM IF counter
0V
output, output
control switch, mute
switch
11 Phase comparator
low-pass filter
(AM/FM switching)
VCC-1.0
LA1845NV
Equivalent circuit
10
Notes
V10≤0.5V : Reception state
1.4V≤V10≤2.2V : Muting on
V10≥3.5V : IF counter output and muting on
11
The device operates in AM mode when a current of
over 200µA flows from pin. 12.
12 Pilot detector low-
pass filter (Forced
VCC-1.0
12
mono) (VCO stop)
13 L outputs
14 R outputs
3.2V
15 Pilot canceler
output
Vreg
16 Decoder input
Vreg
17 PLL input
Vreg
13
( 14 )
15
3
RNF
16
17
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.
The limit values for the resistor are the same as
those for pin 11.
Output impedance ro = 3.3kΩ
Inverting input pin
RNF = 20kΩ
Input impedance ri = 20kΩ
18 FM demodulator
Vreg+0.7
18
Output impedance ro = 2.3kΩ
output
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
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