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參數(shù)資料
| 型號： | TDA4780 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | RGB video processor with automatic cut-off control and gamma adjust |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 27/44頁 |
| 文件大小： | 321K |
| 代理商： | TDA4780 |
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1997 Feb 06
27
Philips Semiconductors
Preliminary specification
RGB video processor with automatic
cut-off control and gamma adjust
TDA4780
Notes to the characteristics
1.
RGB signals controlled by saturation, adaptive black, contrast and brightness. Gamma affects the Y component of
the internal RGB signals.
Adaptive black control acts on Y signal, which is either Y input or Y output from RGB matrix. Negative set-up is not
affected. The level shift value is determined by the peak dark detector, operation selected by control bit ADBL. The
peak dark detector is inactive during blanking. Peak dark detector activated by internal line counter, which starts after
the end of the vertical blank of the sandcastle. Active from line 16 (after end of vertical sandcastle) to line 224
(NTSC mode, NMEN = 1) or line 272 (PAL mode, NMEN = 0). It is recommended to increase the contrast value
(subaddress 02H) by 15% if ADBL = 1. The line numbers are doubled if control bit HDTV = 1.
At minimum gamma (3FH) any differences in black level steps are amplified by 6 dB.
For nominal saturation the range of values is:
a) 1FH is the minimum value that can be used
b) 20H is the typical value that can be used
c) 21H is the maximum value that can be used.
For nominal contrast the range of values is:
a) 20H is the minimum value that can be used
b) 22H is the typical value that can be used
c) 24H is the maximum value that can be used.
2.
3.
4.
5.
6.
. For meaning of actual nominal signal see
chapter “Characteristics”.
Series resistor in supply voltage should be less than 0.3
.
At 1.0 V cut-off measurement level the function of the cut-off control loop is not guaranteed because the blanking
level is limited to the minimum output voltage. For proper working a guide number for the minimum cut-off
measurement level is 1.3 V.
7.
8.
9.
For nominal AC gain settings the range of values is:
a) 21H is the minimum value that can be used
b) 22H is the typical value that can be used
c) 23H is the maximum value that can be used.
V
V
nom24
V
nom22
10.
. For meaning of actual nominal signal see
chapter “Characteristics”.
11. Sandcastle pulse detector (pin 14)
The sandcastle pulse is compared with 3 (control bit SC5 = 0) or 2 (SC5 = 1) internal threshold levels to separate the
various pulses; the internal pulses are generated while the input is higher than the thresholds. The thresholds are
independent of supply voltage and temperature.
V
nom
-------V
V
V
nom24
------------------
V
V
nom22
------------------
–
V
V
nom24
------------------
V
V
nom20
------------------
–
V
V
nom22
------------------
V
V
nom20
------------------
–
=
=
=
V
nom
-------V
------------------
22
-------V
–
V
V
nom24
------------------
V
V
nom20
------------------
–
V
V
nom22
------------------
V
V
nom20
------------------
–
=
=
=
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