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參數(shù)資料
| 型號： | FN7173 |
| 廠商： | Intersil Corporation |
| 英文描述： | Sync Separator, 50% Slice, S-H, Filter, Horizontal sync output |
| 中文描述： | 同步分離器，50％的切片，上海，過濾器，臥式同步輸出 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 141K |
| 代理商： | FN7173 |
7
Description of Operation
A simplified block schematic is shown in Figure 1. The
following description is intended to provide the user with
sufficient information to understand the effects of the
external components and signal conditions on the outputs of
the integrated circuit.
The video signal is AC coupled to pin 4 via the capacitor C
1
,
nominally 0.1μF. The clamp circuit A1 will prevent the input
signal on pin 4 going more negative than 1.5V, the value of
reference voltage V
R1
. Thus the sync tip, the most negative
part of the video waveform, will be clamped at 1.5V. The
current source I
1
, nominally 6μA, charges the coupling
capacitor during the remaining portion of the H line,
approximately 58μs for a 15.75kHz timebase. From I t = C
V, the video time-constant can be calculated. It is important
to note that the charge taken from the capacitor during video
must be replaced during the sync tip time, which is much
shorter, (ratio of x 12.5). The corresponding current to
restore the charge during sync will therefore be an order of
magnitude higher, and any resistance in series with C
I
will
cause sync tip crushing. For this reason, the internal series
resistance has been minimized and external high resistance
values in series with the input coupling capacitor should be
avoided. The user can exercise some control over the value
of the input time constant by introducing an external pull-up
resistance from pin 4 to the 5V supply. The maximum
voltage across the resistance will be V
DD
less 1.5V, for black
level. For a net discharge current greater than zero, the
resistance should be greater than 450k. This will have the
effect of increasing the time constant and reducing the
degree of picture tilt. The current source I
1
directly tracks
reference current I
TR
and thus increases with scan rate
adjustment, as explained later.
The signal is processed through an active 3 pole filter (F1)
designed for minimum ripple with constant phase delay. The
filter attenuates the color burst by 12dB and eliminates fast
transient spikes without sync crushing. An external filter is
not necessary. The filter also amplifies the video signal by
6dB to improve the detection accuracy. The filter cut-off
frequency is controlled by an external resistor from pin 1 to
ground.
FIGURE 4. STANDARD (NTSC INPUT) H. SYNC DETAIL
EL4583
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