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System-on-Chip Tuner IC for Car Stereo Systems
System-on-Chip Tuner IC for Car Stereo Systems
LA1776M
LA1776M
Overview
The LA1776M is a car radio AM/FM tuner IC that is based on the current LA1787M but features improved AM
upconversion (for improved reception characteristics) and improvements in most other characteristics as well.
The LA1776M pin arrangement is only slightly changed from the LA1787M for easy printed circuit board pattern
design.
Functions
FM front end
FM IF
Multiplex
AM upconversion
Features
Characteristics improved by new noise prevention measures in the mixer and amplifier blocks
Three-signal characteristics improved due to increased dynamic range in the FM front end mixer
Improved AM practical sensitivity and saturation signal-to-noise ratio
FM S-meter shifter function can adjust for sample-to-sample variations in the S-meter
(Fixed resistors are used for SD, KEYEDAGC, MUTE ON ADJ, MUTE ATT, SNC, and HCC.)
High-speed search is possible using the FM band muting time constant switching function
The low power consumption of the earlier device has been reduced even further
Increased flexibility in the MRC setting
Package: QIP64E (14
14 mm)
Block Diagram
VCC
56k
BV
+
48
47
46
75
100k
AM 2nd
min:5k
MIX IN
49
FM-IF-IN2
50
AMDET
AM
AMLC
MUTE
620
1M
51
IF2
AM-IF-IN
ANT D
100 F
52
AMIF
AM
AGC
IF1
AM-IF-OUT
FM-IF-OUT
53
15p
15p
AM MIX
AM
AM-MIX-OUT
Vsm
54
FM-WB-AGC
W-AGC
AM
100 F
AM-SD-ADJ
100k
55
X OSC
+
100k
N-AGC
RF-AGC
56
AM-IF-IN1
FM-IF-IN1
1ST
57
IF
6p
AM-NB-AGC
AMP
IN
MUTE-ATT
470
58
LEVEL
W-AGC
MIX-OUT
DET
59
MIX-OUT
60
AM/FM MIX
N-AGC
FE
33
VCC
61
+
30
1000p
AM-MIX-IN
62
AM OSC
FM RF
MIX-IN
10p
BUFF
AGC
63
FM OSC
10p
BUFF
64
ANT-D
1000p
MIX-IN
1
2
3
+
15p
1000p
220k
AGC
1000p
100
1000p
AM VCC 8V AM ANT AM/FM ANT IN
FE GND
AM/FM VT
FE VCC
51 Car Audio
New
New
New
product
product
product
Noise canceller
MRC
FM/AM switch
5V
ST IND
AM/FM SD
0.022 F
1.3k
+
30k
+
+
+
+
45
44
43
42
41
40
39
38
37
36
35
34
33
FM-VSM
1000p
32
MUTE
DET-OUT
3
drive
31
+
8200p
IF-AMP
SW
REG
68k
1
2
Q.DET
30
0.22 F
IF-AMP
2.7V
+
NC-IN
FM AFC
HCC
IF-AMP
IF
29
REG
AM
MUTE
count AMP
NC.MPX
MRC
AGC
IF-AMP
H det
AMP.
SNC
out2
drive
28
REG
IF-AMP
IF
FM IF
MRC-OUT
3.3 F
s mute
Mute
count SW
time
AM
ATT
27
IF-AMP
const
control
GAD
REG
+
MRCADJ
AM
FM Vsm
REG
FM/AM
26
Zap
AM
SD-ST IND
MRC
BUFF
noise
3.3 F
GND
amp
25
REG
AM/FM
AM/FM VSM
KEYED
FE
SW
+
0.022 F
24
AGC
IF COUNT
23
BUFFER
PHASE-COM
22
phase
tri
VCO
PHASE-
NC
NC
comp
ger
HCC
HPF
LPF
stop
COM
+
21
ECL
pilot
FF 38k
FF
SNC
+
det
VCO
ECL
20
19k
CSB
SEP-ADJ
912kHz
ECL
pilot
AM OSC
19
can
FF
VCO
ECL
20k
0.047 F
NC
Sud De
TRIG
AGTE
18
AGC
100k
FM OSC
ECL
coder
Main
PI-CAN
MATRIX
HC
OUT
17
0.01 F
PI-CAN
4
5
6
7
8
9
10
11
12
13
14
15
16
IN
+
6800p
30k
AM/FM SW
AM/FM
10.25kHz IN
L-ch
R-ch
GND
VCC
OSC BUFF
Overview
The LC72350 Series (LC72358N, LC72362N, and LC72366) are system-on-chip electronic tuning
microcontrollers with a 1.33 s instruction execution time.
These devices include both a high-speed locking circuit and a high-performance direct PLL circuit that can control
the local oscillator C/N characteristics.
Functions
ROM: 16 KB (LC72358N)
RAM: 512 nibbles (LC72358N and LC72362N)
1024 nibbles (LC72366)
A/D converter: 6-bit successive approximation A/D converter with 6 input channels
PLL: Built-in sub-charge pump for high-speed locking, built-in dead zone control
Serial I/O: Three channels (8-bit 3-wire serial I/O)
Multiple interrupt support: 4 levels
Cycle time: 1.33 s (4.5 MHz)
QTP version: LC72P366
Package: QIP80E (14
Block Diagram
30k
+
51k
0.022 F
IF Buffer
47k
+
5/2.5/0V
FM/AM VSM
Electronic Tuning ETR Controllers
Electronic Tuning ETR Controllers
LC72350
LC72350
Series
Series
24 KB (LC72362N)
32 KB (LC72366)
20 mm)
52 Car Audio
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