LA1837_09 Datasheet, PDF (6/9 Pages) Sanyo Semicon Device – For Home Stereo IC with Electronic Tuning Support Single-Chip IC

Continued from preceding page.
Pin No.
Pin function
26
AFC
LA1837
Pin voltage (V)
Vreg
Pin description
The FM SD bandwidth can be modified with the
external resistor connected between this pin and pin
28.
27
AM RF input
28
REG
Vreg
Use this pin at the same potential as pin 28.
Vreg
Vreg = 3.6V
Equivalent circuit
26
27
28
29
OSC
Vreg
Use an oscillator coil between this pin and pin 28.
29
30
Oscillator buffer
1.6V (FM)
The FM SD sensitivity can be modified with the
output,
1.3V (AM) external resistor connected between this pin and
FM SD sensitivity
ground.
30
adjustment
Output impedance ro = 20Ω
Coil specifications (bottom view)
•AM oscillator (for the DUT)
HW-50425 (Mitsumi Electric Co., Ltd.)
3
4
2
1
6
3-2
2T
4-6
9T
2-1
86T
Qo ≥ 80
L = 270μH
•FM detector
600BEAS-9715Z (The Toko Electric Corporation)
3-1
22T
3
4
f = 10.7MHz
Qo = 40
Includes an internal
2
82pF capacitor.
S1
6
•IFT
YD-1073-1 (Mitsumi Electric Co., Ltd.)
3
S4
2
1S
YD-1073
6
SFU450B
1-2
58T
4-6
7T
2-3
94T
fo = 450kHz
Qo = 110
Includes an internal
180pF capacitor.
SFU450B included.
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