參數(shù)資料
型號(hào)： TDA4886
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： 140 MHz video controller with I2C-bus
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP24
文件頁(yè)數(shù)： 18/52頁(yè)
文件大小： 495K
代理商： TDA4886
1998 Nov 11
18
Philips Semiconductors
Product specification
140 MHz video controller with I
2
C-bus
TDA4886
6.
Pin 5 should be used for input clamping and blanking during vertical retrace (signal blanking, brightness blanking and
if control bit PEDST = 1 pedestal blanking). With a fast clamping pulse (transition between V
5
= 1.2 to 3.5 V and vice
versa in less than 75 ns/V) no blanking will occur during input clamping.
For 75 ns/V < t
r/f5
≤
280 ns/V the generation of the internal vertical blanking pulse is uncertain. For t
r/f5
> 280 ns/V
the internal blanking pulse will be generated.
Pin 5 open-circuited will activate permanent input clamping and undefined blanking.
Pin 5 can be used to synchronize all adjustments via the I
2
C-bus (one by one). In case of a completed I
2
C-bus
transmission in buffered mode only the leading edge of a vertical blanking pulse activates an adjustment. See also
Section 7.10.
After the adjustment has been activated (validation of buffered I
2
C-bus data) the I
2
C-bus will be reset and further
transmissions in direct or buffered mode are enabled.
I
2
C-bus transmissions in direct mode need no synchronization pulses.
Input voltages less than
0.1 V can produce internal substrate currents which disturb the leakage currents at the
signal inputs. An internal protection circuit creates a current for pin voltages of approximately 0 V or less. Feeding
clamping/blanking pulses via a resistor of some k
protects the pin from negative voltages.
Pin 11 should be used for output clamping and/or blanking. Pin 11 open-circuited will activate permanent blanking
and output clamping.
10. Composite signals will not disturb normal operations because an internal clipping circuit cuts all signal parts below
input reference black level (see Fig.3).
7.
8.
9.
11. Contrast control acts on internal colour signals under I
2
C-bus control; subaddress 02H (bit resolution 1.6% of
contrast range).
12.
A
n
: colour signal output amplitude in channel n = 1, 2 or 3 at any contrast setting.
A
n0
: colour signal output amplitude in channel n = 1, 2 or 3 at nominal contrast setting and same gain setting.
13. When OSD fast blanking is active and V
2,3,4
are HIGH (V
1
> 1.7 V, V
2,3,4
> 1.7 V) the OSD colour signals will be
inserted in front of the gain potentiometers. This assures a correct grey scale of all video signals. The amplitudes of
the inserted OSD signals can be controlled simultaneously by OSD contrast via the I
2
C-bus.
14. OSD contrast control acts on inserted OSD colour signals under I
2
C-bus control; subaddress 03H (bit resolution
6.7% of OSD contrast range).
15. This pin can be used for subcontrast setting, beam current limiting and contrast modulation. Both the video and OSD
contrast are reduced simultaneously (see Figs 8 and 9). Because of the high-ohmic input impedance the pin should
be tied to a voltage of more than 5 V or applied with a capacitor of some nF if not used.
16. Brightness control adds an I
2
C-bus controlled DC offset to the internal colour signal; subaddress 01H (bit resolution
1.6% of brightness range).
17. The voltage difference between video black level and reference black level is related to the colour signal (see note 3)
with nominal 0.7 V (p-p) input signal, at nominal contrast (subaddress 02H = 26H) and for any gain setting.
The voltage difference (in Volts) is proportional to the gain setting (grey scale tracking). Therefore
V
bl
(in percent)
is constant for any gain setting. The given values of
V
bl
are valid only for video black levels higher than the signal
output switch-off voltage V
22,19,16(min)
.
18. Gain control acts on video signals and inserted OSD video signals under I
2
C-bus control; subaddress 04H
(channel 1), 05H (channel 2) and 06H (channel 3; bit resolution 1.6% of gain range respectively).
G
track
20
maximum of
A
1
A
10
--------
A
A
2
--------
×
log
A
1
A
10
--------
A
A
3
--------
×
log
A
2
A
20
--------
A
A
3
--------
×
log
;
;
×
dB
=
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