Ordering number : ENA2057A
Monolithic Linear IC
LA1844MC
Overview
For Home Stereo
Single-chip Tuner IC
The LA1844MC 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 : MFP24SJ(300mil)
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 Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment. The products mentioned herein
shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life,
aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system,
safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives
in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any
guarantee thereof. If you should intend to use our products for new introduction or other application different
from current conditions on the usage of automotive device, communication device, office equipment, industrial
equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the
intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely
responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
s products or
equipment.
62712 SY 20120611-S00003/51612 SY No.A2057-1/11
LA1844MC
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.A2057-2/11
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
