LA1845N_09 Datasheet, PDF (4/9 Pages) Sanyo Semicon Device – For Home Stereo IC Single-Chip Tuner IC

Test Circuit
AM-IN
(1MHz)
OSC
BUFF
1000pF
20pF
39pF
HW50425
5.6kΩ
0.047μF
50Ω
39MH
+3.3_μF
6.8kΩ
24
23
22
21
LA1845N
22μF
20
0.047μF
1000pF 4.7μF
+
10μF
0.01μF ⁺
A LPF
0dB
A LPF
20kΩ
0.1μF _0.0047μF
65kΩ
0.015μF 0.015μF
20kΩ
19
18
17
16
15
14
13
LOUT
ROUT
LA1845N
1
2
FM-IN
(10.7MHz) 300Ω
75Ω
0.047μF
33μF ⁺ 0.047μF
3
4
HW6215
5
6
7
TU-LED ST-LED
V-SD
V-ST
1000pF
50kΩ
50kΩ
AM IF
8
10kΩ
9
10
11
12
1μF _3kΩ
+
1000pF
AM/FM
NORMAL ^{0.47μF +} _FM
IF-BUFF _{20pF SEEK}
AM
1μF
+
MONO
VCC
5.0V
600BEAS-10471
Detector coil
Discriminator
Top view
Pin Functions
Pin No.
1
Pin function
FM IF input
Pin voltage (V)
Vreg
Pin description
Input impedance ri = 330Ω
Equivalent circuit
1
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC.
3
2
3
REG
2.3
Vreg = 2.3V
3
4
AM IF input
5
GND
6
Tu-LED
7
ST-LED /
AM-IF output
8
FM detector
9
VCC
10
AM / FM IF
counter output,
output control
switch, mute
switch
Vreg
Input impedance ri = 2kΩ
0
VCC
VCC
Active low
Open collector
VCC
0
The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is
recommended for detector coil.
V10 ≤ 0.5V : Reception state
1.4V ≤ V10 ≤ 2.2V : Muting on
V10 ≤ 3.5V : IF counter output and muting on
4
6
7
10
Continued on next page.
No.7185-4/9