- 7 -
IC BLOCK DIAGRAM & DESCRIPTION
IC101 LA1824 (Tuner)
Pin
Quiescent
number
Function voltage (V) Equivalent circuit
Remarks
AM FM
Pilot detector
Forced monaural mode w
hen pin
14 filter 2.9 3.8
14 is connected to ground
(forced mono)
Phase FM mode is when pin 15 is open,
15
compara tor f
ilter
0
3.8
and AM mode is w hen pin 15 is
(AM/FM switch)
connected to ground
16 L output
1.4 1.4
Rout = 7.5 k
17
R output
18 MPX input 1.3 1.3
Rin = 50 k
Output impedance
AM : Rout = 50 k
FM : Rout = 500
AM/FM
19 detector 0.5 1.5
The channel separation can be
output
adjusted with an external
capacitor connected between this
pin and ground
Connect the FM oscillator coil
20 FM-OSC 4.5 4.4 between this pin and pin 21
(V
CC
2)
ILA00318
14
15
ILA00319
ILA00320
16
17
Rout
ILA00321
18
Rin
ILA00322
19
Rout(FM)
Rout(AM)
ILA00323
21 20
( )
Pin
Quiescent
number
Function voltage (V) Equivalent circuit
Remarks
AM FM
FM-FE block V
CC
21 V
CC
2 4.5 4.4
Power is supplied pin 4 (V
CC
1)
via e
xternal resistor (10
)
Connect the FM-RF coil between
22 FM-RF output 4.5 4.4
this pin and pin 21 (V
CC
2)
24 FM-RF input 0 1.0
Rin = 500
23 GND2 0 0
FM-FE block ground
ILA00324
R
421
ILA00325
Rin
24
22 21
To Next Page
Loading...
