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PDF LA1780 Data sheet ( Hoja de datos )
| Número de pieza | LA1780 | |
| Descripción | Single-Chip Tuner IC for Car Radios | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN5724A
Monolithic Linear IC
LA1780M
Single-Chip Tuner IC for Car Radios
Overview
The LA1780M integrates all six blocks required in a car
radio tuner on a single chip. The LA1780M is based on
the LA1888NM, and features improvements to each of the
blocks; improvements designed to provide improved noise
characteristics, especially for noise related to multipath,
three-signal intermodulation distortion, and two-signal
suppression.
Functions
• FM front end
• FM IF
• Noise canceller
• Multiplex
• AM up-conversion
• FM/AM switch
• MRC
Features
• Improved noise reduction methods
— The FM front end provides excellent 3-signal
characteristics equivalent to those of the LA1193M.
Mounted on a 40 × 80 × 1.3 mm3
glass epoxy printed circuit board
Independent IC
— Superlative listenability due to improved medium and
weak field noise canceller characteristics.
— Improved separation characteristics
— Anti-birdie filter
— Improved AM and FM thermal characteristics
— Excellent FM signal meter linearity
— Modified N.C. circuit for improved noise rejection
• Double conversion AM tuner (up conversion)
Reduces the number of external components required as
compared to earlier double conversion tuners, in
particular, no crystal is required (when used in
conjunction with the LC72144).
• Sample-to-sample variation reduction circuit built into
the FM IF circuit.
(Fixed resistors are used for the SD, keyed AGC, mute
on adjustment, ATT, SNC, and HCC functions.)
• Since the LA1780M retains the block structure of the
LA1888NM, products using that IC can be easily
converted, allowing further end product miniaturization.
Package Dimensions
Unit:mm
3159-QFP64E
[LA1780M]
17.2
14.0 1.6
1.0 0.8
0.35 1.0
33
48
32
49
0.15
Ambient temperature, Ta — °C
64
1
17
16
0.1
2.7
15.6 0.8
SANYO: QFP64E (QIP64E)
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
33100TN (OT)/92498RM (OT) No. 5724-1/38
1 page  
Block Diagram
LA1780M
IF limiter
amplifier
No. 5724-5/38
5 Page 
Continued from preceding page.
Pin No.
Function
LA1780M
Description
This pin functions both as the IF
counter buffer (AC output) and as
the seek/stop switch pin.
The voltage V23 switches
between the following three
modes.
IF counter buffer seek/stop
During FM reception:
23 switching
5 V: Seek mode
2.5 V: Forced SD mode
0 V: Reception mode
SD circuit
AM reception
(two modes: 0 and 5 V)
5 V: Seek mode
0 V: Reception mode
Equivalent circuit
IF counter
buffer
Forced
SD: 2.5 V
24 AM/FM signal meter
Fixed-current drive signal meter
output
In AM mode, pin 32 outputs a
32 Dedicated FM signal meter 1-mA current. Thus the HCC
circuit is turned off.
FM
S-meter
AM
S-meter
Outputs a 1-mA
current during AM
reception
FM reception: the voltage V23
switches between three modes
as follows.
5 V: The SD pin operates linked
to the IF counter buffer.
2.5 V: Forced SD mode: operates
26 Stereo indicator for the SD pin
as the SD pin.
0 V: Reception mode: stereo
indicator
AM reception: (two modes: 0 and 5 V)
5 V: Operates as the seek SD pin.
0 V: Reception mode. Not used.
Stereo
indicator
Seek/stop
switching
Continued on next page.
No. 5724-11/38
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LA1780.PDF ] | |
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