LA1844

Manufacturer Part NumberLA1844
DescriptionSingle chip tuner IC
ManufacturerSanyo Semiconductor Corporation
LA1844 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
Page 6/11:

Pin Functions

Download datasheet (822Kb)Embed
PrevNext

Pin Functions

Pin voltage
Pin No.
Function
(V)
1
FM IF input
Vreg
2
AM mixer output
V CC
3
REG
2.1
4
AM IF input
Vreg
5
GND
0
6
Tu-LED
V CC
7
ST-LED / AM-IF
output
8
FM detector
V CC
9
VCC
5.0
10
AM / FM IF
0
counter output,
output control
switch,
mute switch
11
Phase comparator
V CC -1.0
low-pass filter
(AM/FM switching)
LA1844,LA1844M
Equivalent circuit
Input impedance R i = 330Ω
Connect the mixer coil between this pin and V CC
Vreg = 2.4V
Input impedance R i = 2kΩ
Active low
Open collector
The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is
recommended for detector coil.
V 10 ≤ 0.5V : Reception state (Normal)
1.4V ≤ V 10 ≤ 2.2V : Muting on (Mute)
V 10 ≥ 3.5V : IF counter output and muting on
(Seek)
The device operates in AM mode when a current
of over 200µA flows from pin 12.
Notes
Continued on next page.
No.7930A-6/11