LA1845N_09 Datasheet, PDF (5/9 Pages) Sanyo Semicon Device – For Home Stereo IC Single-Chip Tuner IC

Continued from preceding page.
Pin No.
Pin function
11
Phase comparator
low-pass filter
(AM/FM switching)
LA1845N
Pin voltage (V)
VCC-1.0
Pin description
The device operates in AM mode when a current of
over 200μA flows from pin.12.
Limit values for the resistor :
2.7kΩ (When VCC = 7V)
3.9kΩ (8V)
12
Pilot detector
low-pass filter
(Forced mono)
(VCO stop)
13
L outputs
14
R outputs
VCC-1.0
3.2
3.2
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
15
Pilot canceler output
Vreg
Equivalent circuit
11
12
13
( 14 )
15
3
16
Decoder input
Vreg
Inverting input pin
RNF = 20kΩ
RNF
16
17
PLL input
Vreg
Input impedance ri = 20kΩ
18
FM demodulator
output
Vreg + 0.7
Output impedance ro = 2.3kΩ
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
19
AM detector output
0 (FM)
1.5 (AM)
Output impedance ro = 10kΩ
20
S meter,
AM AGC
21
AM RF input
22
AFC
0.2 (FM)
0.9 (AM)
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.
Vreg
Must be used at the same potential as pin 22.
Vreg
The FM SD bandwidth can be adjusted with the
external resistor connected between this pin and
pin 3 (Vreg).
17
18
100V
19
20
R
21
22
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