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PDF TB1274BFG Data sheet ( Hoja de datos )
| Número de pieza | TB1274BFG | |
| Descripción | Synchronizing Signals Processor IC | |
| Fabricantes | Toshiba | |
| Logotipo |  |
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TB1274BFG
TOSHIBA Bi-CMOS INTEGRATED CIRCUIT SILICON MONOLITHIC
TB1274BFG
LUMINANCE,
CHROMA
AND
SYNCHRONIZING SIGNALS PROCESSOR IC
FOR PAL / NTSC / SECAM COLOR TV
TB1274BFG integrates luminance, chroma and synchronizing
signals processing circuits for PAL / NTSC / SECAM color TV
system.
TB1274BFG incorporates high performance picture quality
compensation circuits in luminance section, an automatic PAL
/ NTSC / SECAM discrimination and decode circuits in chroma
section, and an automatic 50 / 60 Hz discrimination circuit in
synchronizing section.
Besides a crystal oscillator generates 4.43MHz, 3.58MHz and
M/N-PAL clock signals internally for color demodulation. A
QFP48-P-1014-0.80
horizontal PLL circuit is also built in this IC.
PAL / SECAM demodulation circuits which are
Weight : 0.83 g (Typ.)
adjustment-free circuits incorporates a 1H DL circuit inside for
operating the base band signal processing system.
Also, TB1274BFG makes it possible to set and to control various functions through the built-in I2C BUS
line.
FEATURES
LUMINANCE SECTION
• Built-in chroma trap filter
• Y delay line
• Sharpness control
• Sub-Contrast control (-/+ 2dB)
• Black set-up
CHROMA SECTION
• Built-in 1H delay circuit (PAL / SECAM base band
demodulation system)
• One crystal color demodulation circuit (4.43MHz,
3.58MHz, M/N-PAL)
• Automatic system discrimination system and
forced system mode
• 1H delay line also serves as comb filter in NTSC
demodulation
• Built-in band-pass and take-off filter, SECAM bell
filter
• Sub-Color control (-/+2dB)
SYNCHRONIZING SECTION
• Built-in horizontal VCO resonator
• Adjustment-free horizontal and vertical oscillation
by count-down circuit
• Automatic vertical frequency discrimination
circuit
• Noise detection circuit
OTHERS
• Y/C out level control
• 4-channels inputs switching
• 2-input circuit for RGB
• 2-input circuit for Y/Cb/Cr
• Y/Cb/Cr outputs
• Cb/Cr offset adjustment
• Built-in pre filters for A/D converter
1 2005-08-18
1 page  
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TB1274BFG
PIN
No.
PIN NAME
FUNCTION
INTERFACE CIRCUIT
INPUT / OUTPUT
SIGNALS
32
17 Cr1-IN
18 Cb1-IN
17,18
240Ω
240Ω
240Ω
Input Y1/Cb1/Cr1 signal through
a clamping capacitor.
(Selected by I2C BUS.)
When Y/Cb/Cr1-IN is active, Y1
signal is synchronized.
1kΩ
1kΩ
28
32 Y : 1Vp-p(with sync)
DC : 1.7V
Cb/Cr : 0.7Vp-p(100％
color bar)
DC : 2.5V
19 Y1-IN
19
5kΩ
28
32
20 CLP-FIL
Connect a filter for clamping Y
signal.
20 10kΩ
50Ω
21 Y-OUT
22 Cb-OUT
23 Cr-OUT
Y/Cb/Cr output pins.
The output’s amplitudes is
variable from 0.5 to 1.6Vp-p by
I2C BUS.
24
YS1
(YCbCr2-in)
Pin to switch main signals and
YCbCr2 signals.
21,22,23
50Ω
28
32
28
32
DC ;
Y : 1.3V, Cb/Cr : 1.8V
AC ;
Y:
0.7Vp-p(0dB,non-sync)
Cb/Cr : 0.7Vp-p(0dB)
24 6.1kΩ
28
1.0V≦YCbCr2≦5.0V
(Th : 0.7V)
5 2005-08-18
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TB1274BFG
ITEM / Number of bits
FUNCTION
VARIABLE RANGE
PRESET
N-COMB / ①
VIDEO SELECT / ④
RGB SELECT / ②
HALF TONE / ①
Cb/Cr-MUTE / ①
Cb/Cr OFFSET1 /
④/④
Cb/Cr OFFSET2 /
④/④
V-FREQ / ③
V C/D MODE / ②
AFC SENS / ②
MVM / ①
S R-Y ADJ / ④
S B-Y ADJ / ④
BELL/HPF / ②
BELL f0 / ①
S V-ID SW / ①
S GP / ②
S ID / ①
S-INHBT / ①
RGB1 ENB / ①
1H addition switch, when NTCS.
Selection of input video signals
Selection of input sources.
Refer to FUNCTION DESCRIPTION.
Half tone gain switch
Cb/Cr output mute switch
Cb/Cr offset adjustment (main route)
0 : OFF, 1 : ADD
Refer to
FUNCTION DESCRIPTION.
00 : Main, 01 : YCbCr1
10 : RGB1, 11 : don’t use
0 : -10dB, 1 : -6dB
0 : OFF, 1 : ON
0 H : -12 ～ F H : +10.5mV
OFF
0000
Main
-10dB
OFF
0mV
Cb/Cr offset adjustment (YCbCr2 0 H : -12 ～ F H : +10.5mV
input)
0mV
V count down frequency switch.
000 : Automatic mode 1,
Automatic
Automatic mode 1 ;
001 : 50Hz, 010 : 60Hz,
mode 1
50/60Hz automatic distinction. At 011 : Automatic mode 2,
no-signal, the last statement is 100 : Forced 312.5H (AFC
kept. Right after power-on, 50Hz free-run),
mode is run.
101 : Forced 262.5H (AFC
Automatic mode 2 ;
free-run),
50/60Hz automatic distinction. And 110 : Forced 313H (AFC
50Hz mode is run at no-signal.
free-run),
Refer to FUNCTION DESCRIPTION. 111 : Forced 263H (AFC free-run)
V count down judge switch.
00 :Normal 1, 01 : Teletext,
Normal 1
Refer to FUNCTION DESCRIPTION. 10 : Fast, 11 : Normal 2
note)
Normal 1 : One time detection
Normal 2 : Continuously detection
AFC sensitivity switch
00 : +6dB, 01 : 0dB,
+6dB
10 : -6dB, 11 : -17dB
(data : 00)
Macrovision Mask + AFC Mask
0 : Narrow, 1 : Always masked
Narrow
SECAM R-Y black adjustment
0 H : -10 ～ F H : 8.8mV
0mV
SECAM B-Y black adjustment
0 H : -10 ～ F H : 8.8mV
0mV
SECAM bell/HPF switching. Or the 00 : Bell, 01 : Boost 1,
Bell
high frequency side on SECAM bell 10 : Boost 2, 11 : HPF
filter is boosted.
Refer to FUNCTION DESCRIPTION.
BELL f0 adjustment
0 : Normal, 1 : +15kHz
Normal
SECAM V-ID switch
0 : OFF, 1 : ON
OFF
SECAM gate position adjustment (Its 00 : Normal, 01 : 0.4μs delay,
Normal
width is same)
10 : Normal, 11 : 0.4μs forward
SECAM sensitivity switch
0 : Normal, 1 : Low
Normal
SECAM inhibition switch
0 : Normal, 1 : Inhibited
Normal
Enable YS3 to switch to RGB1-IN.
0 : Disable, 1 : Enable
Disable
Refer to FUNCTION DESCRIPTION.
11 2005-08-18
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| PDF Descargar | [ Datasheet TB1274BFG.PDF ] | |
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