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參數(shù)資料
| 型號： | M491B1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL |
| 中文描述： | 單片電壓合成調(diào)諧系統(tǒng)的1個模擬控制 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 135K |
| 代理商： | M491B1 |
M491B
SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM
WITH 1 ANALOG CONTROL
.
16-STATION MEMORY - 7-SEGMENT LED
DISPLAY
.
VOLTAGESYNTHESIZER : 13 BITS
.
4-BANDPRESET CAPABILITY
.
NON-VOLATILEMEMORY : 304 BITS
- 16 WORDS OF19 BITS FORTUNING VOLT-
AGE (13 bits) - BAND (2 bits) - FINE DETUN-
ING (4 bits)
- 10
4
MODIFYCYCLES PER WORD
- MIN 10 YEARSDATARETENTION
.
PCM REMOTE CONTROL RECEIVER : DE-
CODES SIGNAL TRANSMITTED BYM708
.
VOLUME D/A: 6-BITRESOLUTION / 8kHz
.
MEMORY SKIP FUNCTION
.
AUTOMATIC SEARCH WITH DIGITAL AFT
CONTROL
.
FINE DETUNING D/A ACTING ON AFT DIS-
CRIMINATOR (16 steps) WITH SEPARATE
STORAGE FOR EACH MEMORY POSITION.
ALTERNATIVELYIT CAN BE USED TO CON-
TROL BRIGHTNESS OR COLOUR SATURA-
TION
.
MANUAL SEARCH WITH DIGITAL AFT CON-
TROL
.
MANUALSEARCH WITH LINEAR AFT
.
SWEEPSEARCHDISPLAYOUTPUT
.
SUPPLYVOLTAGES : V
DD
= + 5V,
V
PP
= + 25VFOR THE MEMORY
.
CLOCKOSCILLATOR: 445TO 510kHz
.
INTEGRATED DIGITAL POWER ON RESET
(no externalinitialization circuitry required)
September 1992
DIP40
(Plastic Package)
ORDER CODE :
M491B1
DESCRIPTION
The M491B is a monolithic N-MOS LSI circuit in-
cluding a Floating-gate Non-Volatile Memory for
storage of up to 16 stations. Tuning of the station
is performedwith a 8192step D/Aconverter,using
the principleof voltagesynthesis.It is designedfor
7-segmentLEDdisplays. Direct memory selection
is possibleonlyfrom remotecontrolwhileUp/Down
memory scanning is possibleon the set and also
from remote control. An option input for 8 or 16
stations is available. The circuit also includes a
PCM remote control receiveroperatingin conjunc-
tion with the transmitter M708. The highly reliable
transmissioncode ensureserror-free signaldetec-
tion even in presence of high noise conditions.
Search of the station is possible in automatic or
manual modes. The circuit can operate with a
DigitalorLinearAFTcontrol.TheDigitalAFTmode
is necessary for automaticsearch and requires an
external circuit (TDA4433 or equivalent,e.g. dual
comparatorplus TVstationdetector)to convertthe
AFC-S-curve intoanUp/Downcommand.Finetun-
ing(detuning)is also possiblewith differentmodes
ofoperation.Thecircuitisassembledin 40-pindual
in-line plasticpackage.
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(GND)
MEMORYSUPPLY
MEMORYTIMING
FINE TUNINGD/A
TUNINGD/A
DIGITALAFTSTATUS
OSC. IN
OSC. OUT
TEST
AFT1
AFT2
SWEEPDISPLAYOUT
VOLUMED/A
DIGITALAFTEN.
V3
V2
V1
X4
X3
X2
X1
MAINSON OPTION
MAINSON/OFF
SEGM.a
SEGM.b
SEGM.c
SEGM.d
OPT.8/16
SEGM.e
SEGM.f
SEGM.g
SEGM.h + i
UHF
CATV
VHFIII
VHFI
V
SS
V
DD
V
SS
(GND)
LINEARAFT DEF.
I.R.INPUT
4
PIN CONNECTIONS
1/16
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