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IC BLOCK DIAGRAM & DESCRIPTION
IC101 LA1824 (Tuner)
Quiescent
Pin
Function
voltage (V)
number
AM
FM
Pilot detector
14
filter
2.9
3.8
(forced mono)
Phase
15
compara tor f ilter
0
3.8
(AM/FM switch)
16
L output
1.4
1.4
17
R output
18
MPX input
1.3
1.3
AM/FM
19
detector
0.5
1.5
output
20
FM-OSC
4.5
4.4
Equivalent circuit
Remarks
14
Forced monaural mode w hen pin
14 is connected to ground
ILA00318
15
FM mode is when pin 15 is open,
and AM mode is w hen pin 15 is
connected to ground
ILA00319
16
Rout = 7.5 k
Rout
(
)
17
ILA00320
18
Rin = 50 k
Rin
ILA00321
Output impedance
AM : Rout = 50 k
FM : Rout = 500
Rout(FM)
19
The channel separation can be
Rout(AM)
adjusted with an external
capacitor connected between this
ILA00322
pin and ground
21
20
Connect the FM oscillator coil
between this pin and pin 21
(V CC 2)
ILA00323
Quiescent
Pin
Function
voltage (V)
number
AM
FM
21
V CC 2
4.5
4.4
22
FM-RF output
4.5
4.4
24
FM-RF input
0
1.0
23
GND2
0
0
- 7 -
Equivalent circuit
Remarks
FM-FE block V CC
R
21
4
Power is supplied pin 4 (VCC1)
via external resistor (10
ILA00324
22
21
Connect the FM-RF coil between
this pin and pin 21 (V CC 2)
24
Rin
Rin = 500
ILA00325
FM-FE block ground
)
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