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PDF LA1145M Data sheet ( Hoja de datos )

Número de pieza LA1145M
Descripción FM IF System (Quadrature Detector) for Car Radio
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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No Preview Available ! LA1145M Hoja de datos, Descripción, Manual

Ordering number: EN 2725A
Monolithic Linear IC
LA1145, 1145M
FM IF System (Quadrature Detector) for Car Radio
Features
1. On-chip IF count buffer circuit and microprocessor-
controlled switch circuit for ETR.
2. Compared to the LA1140, the LA1145, 1145M offer:
1 Improved signal meter output linearity;
2 Improved band mute temperature stability;
3 Improved S/N ratio;
4 Improved sound quality at weak signal input when
noise is present, and;
5 Improved AMR characteristics during weak signal
input.
3. Reduced parts’ count simplifies design:
1 On-chip IF count buffer circuit;
2 On-chip SD circuit — sensitivity can be set
independently of soft mute characteristics, and;
3 Variable S-meter gradient — three pin S-meter output
(pins 5, 16 and 17) facilitates independent control of
SNC and HCC.
Package Dimensions
unit : mm
3115-SIP18Z
[LA1145]
unit : mm
3036B-MFP20
SANYO : SIP18Z
[LA1145M]
SANYO: MFP20
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HS(II)/3132TS/2118TA No.2725-1/17

1 page




LA1145M pdf
Sample Application Circuit
LA1145, 1145M
50 µs
DC
emphasis
capacitor
Mute driver
output
S-meter
output
LS1140 and LS1145 Compared
Parameter
Package
IF amp, limiter
Quadrature detector
AF preamp
AFC output
Signal meter output
Band muting
IF count buffer output
SD circuit
S/N
3 dBµ limiting sensitivity
Weak signal noise output
LA1140
SIP-16
Direct-coupled
j
j
j
j
j
78 dBµ
25 dBµ (fixed)
j
LA1145
SIP-18Z
MFP-20
C-coupled
j
j
j
jC
jC
j
j
86 dB
25 to 40 dBµ
jC
L1: 81N-014A (Sumida)
L2: 81N-014B (Sumida)
Unit (resistance: , capacitance: F)
Remarks
Improved linearity, variable S-meter gradient
Improved temperature stability,
VBE dependent
Common with STRQ
For the LA1140, Coupled with the soft muting
function.
–3 dBµ limiting sensitivity variable,
independent of soft muting function
No. 2725-5/17

5 Page





LA1145M arduino
LA1145, 1145M
Soft Mute Characteristics
1. Control
The S/N setting (C/N) for weak inputs and the –3 dB limiting sensitivity can be controlled by obtaining the proper value for
the un-soft muted input/output signal characteristic. However, usable sensitivity cannot be controlled as this is determined by
the front end and IF design which are unrelated to soft muting.
2. Soft mute setting
Soft mute operation depends on the S-meter circuit voltage and the hole
detection circuit voltage. As shown in the graph on the right, the degree
of soft muting correlates with the mute drive voltage, V15. The control
signal line of the mute drive voltage switches before and after the
10 dBµ ANT divergence point.
When adjusting the soft mute with a weak signal which does not affect
the S-meter, first adjust it using the hole detection input signal. However,
as the S-meter output will readjust the soft mute level, also adjust the
soft mute using the S-meter output. At this point, the hole detection
output adjusts the gain up to the IF input, causing a variance. Also, the
S-meter output is varied by the value of R16.
The LA1145 differs from the LA1140 in that it works with the internal
soft mute circuit continuously engaged.
Hole detector
S-meter
(Adjust R4, R5)
ANT input level (dBµ)
3. Soft mute transition response characteristic
The degree of soft muting automatically varies according to the change in input field strength. Omitting the influence of the
front end wideband AGC circuit, the LA1145’s response speed is dependent on the time constant at pins 15 and 16.
I/O Characteristics (RCT = 0 )
Mute Driver Voltage Characteristics
IF input level, – dBµ
I/O Characteristics (Mute Start Point)
IF input level – dBµ
I/O Characteristics (Mute Gradient)
ANT input level – dBµ
ANT input level – dBµ
No. 2725-11/17

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