TA1276AN
TENTATIVE
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA1276AN
PAL / NTSC VIDEO CHROMA AND DEFLECTION IC FOR CTV
(NORMAL SCAN / DOUBLE SCAN MODE)
TA1276AN provides Video, Chroma and Deflection (Sync, when
double scan mode) circuit for a PAL / NTSC Color TV, and
suitable for a high picture quality, large screen size, wide and / or
double scanning TV. These functions are integrated in a 56pin
dual-in-line shrink-type plastic package.
TA1276AN provides a high-performance video processor in which
a YUV double scanning signal can be applied in Video, PAL /
NTSC auto-detection circuit in Chroma and 50 / 60Hz
auto-detection circuit in Sync. PAL demodulation circuit includes
Baseband signal processing system. And this demodulation
circuit does not required any adjustment.
TA1276AN includes I
2
C bus interface, so you can adjust various
functions and controls via the bus.
Weight: 5.55g (Typ.)
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TA1276AN
FEATURES
l
Video / Chroma section
·
Y delay line
·
Chroma trap
·
IQ demodulation for NTSC, UV demodulation for PAL
l
BEP (Back End Processor) section
·
Enable to process a YUV signal independently
·
Double scanning signal processing capability
(Y processing section)
·
Black Stretcher (Controlled by I
2
C bus)
·
Highbright-color Circuit
·
D.L. Aperture Sharpness Circuit+Super Real Transcend Circuit (LTI)
·
γ
Correction (Enable to control Binary line, Gain / Start point)
·
Y noise reduction circuit
·
Velocity Scan Modulation output (The first order differential output and phase / amplitude adjustment)
(Color difference section)
·
Color Detail Enhancer
·
Selectable relative phase and amplitude
·
Flesh-color restoration
·
Color
γ
circuit
·
Baseband tint color
(Text section)
·
RGB primary color output
·
On Screen Display interface
·
Linear RGB interface
·
Fast Blanking
·
Drive control
·
AKB (only black level) or Cut-off Bus control
l
Deflection section
·
High Performance Sync. Separation Circuit
·
Adjustment free H and V oscillation circuit by Countdown system
·
Horizontal and Vertical position adjustment
·
Sync separation, HD output
·
Horizontal and Vertical pulse output in normal mode.
·
DC Restoration Circuit (Controlled by I
2
C bus)
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TA1276AN
BLOCK DIAGRAM
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TA1276AN
TERMINAL FUNCTIONS
PIN
No.
PIN NAME
FUNCTION
INTERFACE CIRCUIT
INPUT /
OUTPUT
SIGNAL
DC
Outputs oscillation waveform of
VCXO.
When 3.58NTSC killer-off this pin
voltage sets 3.2V.
When B / W or other systems
killer-off, this pin voltage sets 1.4V.
3.58NTSC
:3.2V
B / W or Others
system
:1.4V
AC
0.6V
p-p
1
f
sc
output
2
SCP output
Outputs SCP (Sand Castle Pulse).
The output signal consists of clamp
pulse, horizontal blanking pulse, and
vertical blanking.
The minimum load resistance is 3kΩ.
3
SECAM
control
The input / output pin that is used to
control the SECAM demodulation IC.
When current stronger than 250µA
flows from this pin, that is recognized
as SECAM.
When
PAL / NTSC
4.0V
When SECAM
0.75V
4
Y1 output
Outputs the Y signal that routed the
f
sc
TRAP (TRAP can be turned on or
off with Bus.) and the Y delay line
circuit.
5
Outputs B-Y (U) or I signal.
U / Q output It includes LPF that can remove
carrier.
DC
2.5V
Rainbow
color bar
: 360mV
p-p
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TA1276AN
PIN
No.
PIN NAME
FUNCTION
INTERFACE CIRCUIT
INPUT /
OUTPUT
SIGNAL
6
V / I output
Outputs R-Y (V) or Q signal.It
includes LPF that can remove carrier.
The chroma signal that routed ACC
and TOF circuits (before demo input)
can be monitored by pulling up this
pin at 10kΩ.
DC
2.5V
Rainbow
color bar
: 360mV
p-p
7
1H DL
control
Outputs the result of whether the
signal is PAL, SECAM or NTSC.
Connect the output to the 1H DL IC.
In the case of discrimination between
white or black, the voltage just before
that is retained.
The voltage immediately after
turning-on is not fixed.
8.4V: PAL
4.3V: SECAM
0V: NTSC
8
9
10
4.43MHz
X’tal
M PAL X’tal
3.58MHz
X’tal
Connect X’tal. In the case of series
capacity, the oscillation frequency (f
0
)
can be changed. In the case of
parallel capacity, the changeable
range of frequency can be changed.
DC
4.0V
90mV
p-p
11
APC filter
Connect APC filter demodulating the
chroma. The oscillation frequency of
VCXO varies depending on the
voltage at this pin.
DC
12
V
CC1
(5V)
The V
CC
of the chroma and I C Bus
blocks.
Connect 5V (Typ.)
2
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2002-03-29
MCU
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