參數(shù)資料
型號(hào)： TDA8505
廠商： NXP SEMICONDUCTORS
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： SECAM encoder
中文描述： COLOR SIGNAL ENCODER, PDIP32
封裝： PLASTIC, SOT-232-1, SDIP-32
文件頁(yè)數(shù)： 6/32頁(yè)
文件大小： 466K
代理商： TDA8505
July 1994
6
Philips Semiconductors
Preliminary specification
SECAM encoder
TDA8505
FUNCTIONAL DESCRIPTION
The following three important circuits are integrated:
Encoder circuit
Modulator control circuit
Sync separator and pulse shaper.
Encoder circuit
I
NPUT STAGE
R, G and B inputs are connected to the matrix via a
clamping and a blanking circuit.
For an EBU colour bar of 75% the amplitude of the signal
must be 0.7 V (peak-to-peak value). The outputs of the
matrix are Y, D'R and D'B.
The second part of the input stage contains inputs for
colour difference signals and a luminance signal. The
condition for 75% colour bar is
(R
Y) = 1.05 V (peak-to-peak value) at pin 1,
(B
Y) = 1.33 V (peak-to-peak value) at pin 3 and
Y = 1 V (peak-to-peak value) without sync at pin 5. After
clamping and blanking the amplitude and polarity are
corrected such that the signals are equal to the signals of
the matrix output. Signals are connected to a switch. Fast
switching between the two input parts is possible by the
multiplexer control pin (pin 2).
The Y output signal of the multiplexer is added to the sync
pulse of the sync separator.
The Y input (pin 5) is different to the other 5 inputs. The
timing of the internal clamping is after the sync period and
there is no vertical blanking.
The input blanking of Y can be switched off by a HIGH at
pin 12, and the internal sync separator signal is not added
to the Y signal. In this way the Y+SYNC is allowed at pin 5
and after clamping internally connected directly to pin 25.
The colour difference signals are switched sequentially by
H/2 and fed to the low frequency pre-emphasis circuit.
The colour-killing input signal at pin 28 can be used for
completely blanking the internal colour difference signals
at the input of the low frequency pre-emphasis filter.
L
OW FREQUENCY PRE
-
EMPHASIS
This filter is fully integrated, Fig.3 illustrates the nominal
response.
The transfer is guaranteed within the illustrated area for
the whole ambient temperature range by a compensation
circuit.
Fig.3 Nominal response for the low frequency pre-emphasis filter.
handbook, full pagewidth
(dB)
10
MLA953 - 1
10
6
10
5
10
4
0
8
6
4
2
2
f (Hz)
10
7
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