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參數(shù)資料
| 型號： | FM1246 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | CABLE ASSEM 2MM 40POS F-F 12,1 |
| 中文描述： | 桌面視頻 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 177K |
| 代理商： | FM1246 |
1997 May 14
2
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
FEATURES
System I and FM radio broadcast
True 5 V device (low power dissipation)
Full TV frequency range from channel A (45.75 MHz) to
channel 69 (855.25 MHz)
FM radio band coverage from 87.50 to 108.00 MHz
PLL controlled tuning
Programmable PLL step size (31.25, 50 or 62.5 kHz)
True-synchronous vision IF demodulator (PLL)
Ultra-linear FM PLL demodulator for FM radio broadcast
Demodulated video output, AF sound output, second
sound IF output
I
2
C-bus control of tuning, address selection, AFC status
information
Complies with European regulations on radiation, signal
handling and immunity “CENELEC 55020, 55013’’
Small horizontally mounted metal housing.
DESCRIPTION
The FM1246 front-end is designed to receive both TV and
FM stereo signals in the PC Multimedia environment. The
units are available with separate 75
inputs for TV and
FM broadcast reception. The input connectors available
are either standard phono or IEC type (female for TV, male
for FM radio). The tuning, bandswitching and antenna
selection are made through the I
2
C-bus.
The front-end covers the TV bands from 45.75 MHz to
855.25 MHz. The FM band covers the standard
87.50 MHz to 108.00 MHz. An RDS decoder can be
connected to the AF-MPX output. The FM1246 meets the
input immunity and radiation requirements of CENELEC.
The FM1246 consists of a TV tuner, an FM radio tuner and
an IF section, all on a single PCB. The front-end is
assembled in a metal housing made of a rectangular
tin-plated steel frame, with front and rear covers, which
have soldered contacts to the frame. The two phono or
IEC antenna connectors (female for TV, male for FM
radio) are mounted on one side of the frame for the TV/FM
signal inputs. All other connections are made via pins at
the bottom.
The TV IF section uses an intercarrier SAW filter, followed
by a true-synchronous vision IF demodulator (PLL) IC. The
analog AFC voltage is fed to the 5-level A/D converter in
the PLL tuning IC, so that the AFC status can be read via
the I
2
C-bus.
In the FM radio mode, the level detector and AFT functions
are provide for the auto-search routines. The level detector
and AFT status can be read from the A/D bits in the
status-byte. The mute function is also provided to
suppress the audio output signal, if required.
The tuner AGC for both TV and FM radio operation, is
generated with a novel AGC detector which measures the
IF signal level directly at the tuner IF output pins. As
opposed to the conventional AGC detector, this new circuit
allows a higher take-over level and offers superior
immunity against tuner overload.
The demodulation of the TV sound and FM radio IF
(10.70 MHz) is done with a PLL demodulation circuit
contained in the IF IC. In the FM radio mode, the
multiplexed AF signal is then channelled to a stereo
decoder IC which extracts the left/right analog signals.
The multiplexed audio signal is also available at pin 25 to
support RDS implementations. The 2
nd
IF TV sound output
is provided to connect external (analog 2 carrier or digital)
stereo processing.
ORDERING INFORMATION
MARKING
The following items of information are printed on a sticker
that is on the top cover of the tuner:
Type number
Code number
Origin letter of factory
Change code
Year and week code.
TYPE
DESCRIPTION
CATALOGUE
NUMBERS
FM1246/HM/PH
FM1246/HM/I
standard phono
IEC connector
3139 147 13901
3139 147 13911
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FM1246/HM/I | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Desktop video & FM radio module system CCIR I |
| FM1246/HM/PH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Desktop video & FM radio module system CCIR I |
| FM1250 | 制造商:Cliff Electronic Components 功能描述:PLUG CLIFFCON S 4 WAY 制造商:Cliff Electronic Components 功能描述:PLUG, CLIFFCON S, 4 WAY 制造商:Cliff Electronic Components 功能描述:PLUG, CLIFFCON S, 4 WAY; Series:Cliffcon S; Gender:Plug; Connector Mounting:Cable; Contact Termination:-; SVHC:No SVHC (19-Dec-2012); Connector Colour:-; Connector Type:Audio; Contact Plating:-; No. of Contacts:4; Pin Size:- ;RoHS Compliant: Yes |
| FM1250-2545-A | 功能描述:支架與墊片 2.5 x 0.45 THRD ALUM FEMALE 3mm LENGTH RoHS:否 制造商:Schurter 類型:Transipillar Spacers 長度:16 m 螺紋大小:M4 外徑:10 mm 材料:Nylon with Steel 電鍍:Zinc |
| FM1250-2545-SS | 功能描述:支架與墊片 2.5 x 0.45 THRD SS FEMALE 3mm LENGTH RoHS:否 制造商:Schurter 類型:Transipillar Spacers 長度:16 m 螺紋大小:M4 外徑:10 mm 材料:Nylon with Steel 電鍍:Zinc |
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