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参数资料
| 型号： | EL4453 |
| 英文描述： | Video Fader |
| 中文描述： | 视频推子 |
| 文件页数： | 2/12页 |
| 文件大小： | 297K |
| 代理商： | EL4453 |
EL4453C
Video Fader
Fade-Control Characteristics
The quantity VFADE in the above equations is
bounded as b1 s VFADE s 1 even though the
externally applied voltages often exceed this
range
Actually
the
gain
transfer
function
around b1V and a1V is ‘‘soft’’ that is the gain
does not clip abruptly below the 0%-VFADE volt-
age or above the 100% – VFADE level An over-
drive of 03V must be applied to VFADE to obtain
truly 0% or 100% Because the 0% e or 100%-
VFADE levels cannot be precisely determined
they are extrapolated from two points measured
inside the slope of the gain transfer curve Gener-
ally an applied VFADE range of b15V to a15V
will assure the full span of numerical b 1
s
VFADE s 1 and 0 s F s1
The fade control has a small-signal bandwidth
equal to the VIN channel bandwidth and over-
load recovery resolves in about 20 ns
Input Connections
The input transistors can be driven from resistive
and capacitive sources but are capable of oscilla-
tion when presented with an inductive input It
takes about 80 nH of series inductance to make
the inputs actually oscillate equivalent to four
inches of unshielded wiring or about six inches of
unterminated input transmission line The oscil-
lation has a characteristic frequency of 500 MHz
Often placing one’s finger (via a metal probe) or
an oscilloscope probe on the input will kill the
oscillation Normal high frequency construction
obviates any such problems
where the input
source is reasonably close to the fader input If
this is not possible one can insert series resistors
of around 51
X to de-Q the inputs
Signal Amplitudes
Signal input common-mode voltage must be be-
tween (Vb) a 25V and (Va) b 25V to ensure
linearity Additionally the differential voltage on
any input stage must be limited to g6V to pre-
vent damage
The differential signal range is
g
2V in the EL4453C The input range is sub-
stantially constant with temperature
The Ground Pin
The ground pin draws only 6
mA maximum DC
current and may be biased anywhere between
(Vb) a25V and (Va) b 35V The ground pin
is connected to the IC’s substrate and frequency
compensation components It serves as a shield
within the IC and enhances input stage CMRR
and channel-to-channel isolation over frequency
and if connected to a potential other than
ground it must be bypassed
Power Supplies
The EL4453C works well on any supplies from
g
3V to g15V The supplies may be of different
voltages as long as the requirements of the GND
pin are observed (see the Ground Pin section for
a discussion) The supplies should be bypassed
close to the device with short leads 47
mF tanta-
lum capacitors are very good and no smaller by-
passes need be placed in parallel Capacitors as
small as 001
mF can be used if small load cur-
rents flow
Singe-polarity supplies such as a12V with a5V
can be used where the ground pin is connected to
a
5V and Vb to ground The inputs and outputs
will have to have their levels shifted above
ground to accommodate the lack of negative sup-
ply
The dissipation of the fader increases with power
supply voltage and this must be compatible with
the package chosen This is a close estimate for
the dissipation of a circuit
PDe2cVS maxcVSa(VSbVO)cVO RPAR
where
IS max is the maximum supply current
VS is the g supply voltage
(assumed equal)
VO is the output voltage
RPAR is the parallel of all resistors
loading the output
10
相关PDF资料 |
PDF描述 |
|---|---|
| EL4453C | Video Fader |
| EL4453CN | Video Fader |
| EL4453CS | Video Fader |
| EL4581CN | Sync Separator, 50% Slice, S-H, Filter |
| EL4581CS | Sync Separator, 50% Slice, S-H, Filter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4453C | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:Video Fader |
| EL4453CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Fader |
| EL4453CS | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Fader |
| EL4500-NA | 制造商:L COM 功能描述:ICRON EL4500 SYSTEM DVI-USB |
| EL4501 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Front End (VFE) |
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