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LA1838 View Datasheet(PDF) - SANYO -> Panasonic

Part Name
Description
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LA1838 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Continued from preceding page.
Pin No.
Pin function
Pin voltage
10
AM narrow band
CF connection
1.3 V
LA1838
Notes
Recommended narrow band CF: BFU450 C4N
(Murata Mfg. Co., Ltd.)
When the narrow band SD function is not used,
bypass this circuit with a 50 resistor and a
0.047 µF capacitor in series.
Equivalent circuit
10
A10640
11
FM S-meter output 0 V
RL = 8 k
11
A10641
12
AM S-meter
output
0 V (AM)
The AM SD sensitivity is adjusted with an external
resistor connected between this pin and ground
28
AM/FM IF buffer
output,
13
Output control
0V
switch
(mute switch)
V13 0.5 V: Reception state
1.4 V V13 2.2 V: IF buffer output on
V13 3.5 V: IF buffer output and muting on
The device operates in AM mode when this pin is
connected to ground through a resistor.
14
Phase comparator
low-pass filter
(AM/FM switching)
VCC – 1.4 (FM)
0 V (AM)
Limit values for the resistor:
2.7 k(When VCC = 7 V)
3.9 k(8 V), 5.1 k(9 V)
6.2 k(10 V), 7.5 k(11 V)
Pilot detector low-
15
pass filter (Forced VCC – 1.0
mono) (VCO stop)
The device is forced to monaural when a current of
over 50 µA flows from this pin.
The VCO is stopped if this pin is connected to
ground.
The limit values for the resistor are the same as
those for pin 14.
16
Output impedance ro = 200
Pin 16: Right output, pin 17: Left output
17
Post-amplifier
Vreg
Inverting input pins
18
18
inputs and outputs Vreg
Pin 18: Right input, pin 19: Left input
19
19
RNF = 33 k
12
A10642
13
A10643
14
A10644
15
A10645
16
17
A10646
20
MPS outputs
21
3.5 V
3.5 V
Output impedance ro = 3.3 k
Pin 20: Right deemphasis
Pin 21: Left deemphasis
20
21
A10647
Continued on next page.
No. 5888-5/9
 

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