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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)： | 11/16頁 |
| 文件大?。?/td> | 135K |
| 代理商： | M491B1 |
1sec
LINEAR AFT
DEFEAT OUTPUT
MAN UP/DOWN
KEY PRESSED
MAN UP/DOWN
KEY RELEASED
4
Figure12
PIN16 :LINEAR AFT DEFEAT OUTPUT
This output is normally High and goesLow when a
Manual Up/Down command is issued.
It returns High with a 1 second delay from the
release of the key, in order to give the user the
possibilityofthe tuningadjustmentwithouttheAFT
intervention. It goes Low for 0.5s during program
change.
20
MEMORY
UP
DIGITAL
AFT ON
BAND
SEQ.
BAND
I
MEMORY
DOWN
AUTOMATIC
SEARCH
POWER
ON/OFF
BAND
III
VOLUME
UP
BAND
UHF
MAN SEARCH
DOWN
MAN SEARCH
UP
FT.
DOWN
FT.
UP
VOLUME
DOWN
BAND
CATV
19
18
AUTOMATIC
PRESET
MEMORY
ADDRESSING
STORE
MUTE
23
22
21
24
V1
V2
V3
X1
X2
X3
X4
4
Figure13
PIN 17 : DIGITALAFT ENABLE INPUT
If this input is connected to V
SS
(GND), the digital
AFT loop is always disabled. If pin 17 is left open
or is connectedto V
DD
, the digital AFT is automat-
ically enabled at power on. When a manual
up/downsearchcommandisissued,thedigitalAFT
loop isdisabled andthe digitalAFTstatusoutputis
inhibited.
The digitalAFT loop is restoredby the commands:
DigitalAFTon/Automaticsearch/Automaticpreset.
PINS18-19-20-21-22-23-24:
KEYBOARDMATRIX (seeFigure 13)
A command is acceptedif the corresponding con-
tact has been closed for a minimum time of 30ms.
Local input commands and I.R. commands have
the same priority.
If acompleteI.R. command hasbeenreceived, the
local inputs are blocked until the command has
been executedand the”end oftransmissioncode”
generated.
Viceversa an I.R. signal cannot be decoded until
an issuedlocal command has been executed.
MEMORYUP/DOWN
Depressingone ofthesetwocommands,the mem-
ory position is stepped in the UP or DOWN direc-
tion.
If the keyis kept closed, the channelsare stepped
UP/DOWNevery0.5secondor every5 commands
from the transmitter.
The memory locations9 to 16 are jumped if pin 31
is at GND level.
BAND SELECTION
The bandscan be selected either directly or with a
step-by-stepcommand inthe followingsequence:
VHF I
CATV
VHF III
UHF
VHF I and so on
Only one band change is performed at each ac-
cepted command.
Disabled bands are automaticallyskipped. Aband
can bedisabledconnectingthe correspondingout-
put to V
SS
.
M491B
11/16
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| M49-20.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 20.000MHz HC49S-SMD |
| M49-24.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.000MHz HC49S-SMD |
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| M49-25.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 25.000MHz HC49S-SMD |
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