Ordering number : EN7930A
Monolithic Linear IC
LA1844
LA1844M
Overview
For Home Stereo
Single-chip Tuner IC
The LA1844, LA1844M is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning
functions using SD/IF-count technique. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit, thus
allows additional parts to be reduced.
Features
•
Integrated MPX VCO (ceramic resonators are no longer required.)
•
Built-in adjacent channel interference rejection function (114kHz, 190kHz)
•
Supports both SD and IF-count techniques
•
Both FM SD sensitivity and bandwidth can be set
•
Pilot canceler built in.
•
Package : DIP24S(300mil) [LA1844], MFP24S(300mil) [LA1844M]
Functions
•
AM :
RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, SD, oscillator buffer, IF buffer, stereo IF output,
AGC time constant switch
•
FM IF : IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output
•
MPX : PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent channel interference
rejection function, pilot canceler
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before usingany SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
83006 / 52106 MS OT B8-7111 No.7930A-1/11
LA1844,LA1844M
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Symbol
VCC max
Pd max
Ta
≤
45°C
Ta
≤
80°C
Operating temperature
Storage temperature
Topr
Tstg
Conditions
Ratings
9
400
260
-20 to +80
-20 to +150
Unit
V
mW
mW
°C
°C
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCC op
Conditions
Ratings
5
4.3 to 8.0
Unit
V
V
Electrical Characteristics
at Ta
=
25°C
FM Mono Characteristics
at fC
=
10.7MHz, VCC = 5V
Ratings
Parameter
Current drain
Demodulator output
Total harmonic distortion
Signal-to-noise ratio
AM rejection ratio
3dB sensitivity
SD sensitivity
IF counter buffer output
Mute attenuation
Symbol
ICCO-FM
VOFM
THDFM mono
S/NFM
AMR
Vi-limit
LED Sens
VIFBuff-FM
Mute-Att
With no input signal
100dBμ, 100% modulation, fm = 1kHz
100dBμ, 100% modulation, fm = 1kHz
100dBμ, 100% modulation, fm = 1kHz
100dBμ, AM 30% modulation, fm = 1kHz
100dBμ, 100% modulation,
fm = 1kHz output reference, -3dB input
0% modulation
100dBμ
100dBμ, 100% modulation, fm = 1kHz
37
200
47
275
76
57
400
dBμ
mVrms
dB
73
47
Conditions
min
18
210
typ
28
330
0.35
80
65
32
40
max
38
420
1.5
Unit
mA
mVrms
%
dB
dB
dBμ
FM Stereo Characteristics
at fC
=
10.7MHz, 100dBμ, VCC = 5V
Ratings
Parameter
Separation
Stereo on level
Total harmonic distortion
Adjacent channel rejection ratio 1
Adjacent channel rejection ratio 2
Carrier leak
Symbol
Sep
STON
THD-main
BR1
BR2
CL
Conditions
L+R = 90%, Pilot = 10%, fm = 1kHz
Pilot input
Pilot input
fs = 113kHz, Vs = 90%, pilot = 10% :
The left - right modulation, demodulated output
fs = 189kHz, Vs = 90%, pilot = 10% :
The left - right modulation, demodulated output
L+R = 90%, pilot = 10% reference,
pilot = 10% output
38
44
dB
41
dB
min
30
1.5
typ
42
3.5
0.45
36
5.5
1.5
max
Unit
dB
%
%
dB
AM Characteristics
at fC
=
1000kHz, VCC = 5V
Ratings
Parameter
Current drain
Detector output
Symbol
ICCO-AM
VOAM1
VOAM2
Signal-to-noise ratio
S/NAM1
S/NAM2
Total harmonic distortion
THDAM1
THDAM2
SD sensitivity
Local oscillator buffer output
IF counter buffer output
SD-Sens
VOSC-AM
VIFBuff-AM
With no input signal
23dBμ, 30% modulation, fm = 1kHz
80dBμ, 30% modulation, fm = 1kHz
23dBμ, 30% modulation, fm = 1kHz
80dBμ, 30% modulation, fm = 1kHz
80dBμ, 30% modulation, fm = 1kHz
107dBμ, 30% modulation, fm = 1kHz
0% modulation
With no input signal
23dBμ
11
100
140
Conditions
min
11
40
90
17
48
typ
22
80
160
23
54
0.4
0.5
21
140
285
1.1
1.3
31
200
400
max
33
160
230
Unit
mA
mVrms
mVrms
dB
dB
%
%
dBμ
mVrms
mVrms
No.7930A-2/11
工业自动化与控制
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