LA1845NV Datasheet, PDF (5/10 Pages) Sanyo Semicon Device – Single-Chip Home Stereo IC

Continued from preceding page.
Pin No.
Pin function
Pin voltage
19 AM detector output
0V (FM)
1.5V (AM)
20 S meter,
AM AGC
0.2V (FM)
0.9V (AM)
21 AM RF input
Vreg
22 AFC
Vreg
LA1845NV
Equivalent circuit
Notes
Output impedance ro = 3.3kΩ
19
20
R
The resistance of the built-in resistor R is 13.9kΩ.
The SD response during seek operation is
determined with the external capacitor connected to
this pin.
Must be used at the same potential as pin 22.
21
The FM SD bandwidth can be adjusted with the
external resistor connected between this pin and
pin 3 (Vreg).
22
23 OSC
VCC
23
Connect the oscillator coil between this pin and pin
9 (VCC).
Note : Impedance of the secondary oscillator coil
must be 5kΩ or higher.
24 Oscillator buffer
output,
FM SD sensitivity
adjustment
VCC-1.4
R
24
The FM SD sensitivity can be adjusted with an
external resistor connected to this pin.
Output impedance R = 200Ω
Note : Resistance of the external resistor
connected to the pin 24 must be 3.3kΩ or higher.
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