el4095c ETC-unknow, el4095c Datasheet - Page 18

• Manufacturer Part Number: el4095c
• Description: Video Gain Control/fader/multiplexer
• Manufacturer: ETC-unknow

Applications Information
The EL4095 is connected as a unity-gain fader
with an LRC peaking network connected to the
A-input and an RC rolloff network connected to
the B-input The plot shows the range of peaking
controlled by the V
would be useful for flattening the frequency re-
sponse of a system or for providing equalization
ahead of a lossy transmission line
Noise
The electrical noise of the EL4095 has two com-
ponents the voltage noise in series with
5 nV Hz wideband and there is a current noise
injected into
noise will be
V
and the input-referred noise is
V
where A
Here is a plot of input-referred noise vs A
Thus for a gain of three or more the fader has a
noise as good as an op-amp The only trade-off is
that the dynamic range of the input is reduced by
the gain due to the nonlinearity caused by
gained-up output signals
Power Dissipation
Peak die temperature must not exceed 150 C
This allows 75 C internal temperature rise for a
75 C ambient The EL4095 in the 14-pin PDIP
n out
n input-referred
EL4095C
Video Gain Control Fader Multiplexer
Input-Referred Noise vs Closed-Loop Gain
e
V
(A
V
is the fed-back gain of the EL4095
e
b
V
n input
V
(V
IN
n input
of 35 pA Hz
)
2
GAIN
a
)
2
(I
a
n input
(I
n input
input This circuit
R
F
)
The
2
R
F
A
V
Contd
a
)
2
V
output
V
4095 – 35
IN
is
18
package has a thermal resistance of 65 C W and
can thus dissipate 1 15W at a 75 C ambient tem-
perature The device draws 20 mA maximum
supply current only 600 mW at
and the circuit has no dissipation problems in
this package
The
105 C W thermal resistance with the EL4095
and only 714 mW can be dissipated at 75 C ambi-
ent temperature The EL4095 thus can be operat-
ed with
dissipation caused by heavy loads must be con-
sidered If this is a problem the supplies should
be reduced to
The output will survive momentary short-cir-
cuits to ground but the large available current
will overheat the die and also potentially destroy
the circuit’s metal traces The EL4095 is reliable
within its maximum average output currents and
operating temperatures
EL4095C Macromodel
This macromodel is offered to allow simulation of
general EL4095 behavior We have included
these characteristics
Small-signal frequency response
Output loading effects
Input impedance
Off-channel feedthrough
Output impedance over
b
These will give a good range of results of various
operating conditions but the macromodel does
not behave identically as the circuit in these ar-
eas
Temperature effects
Signal overload effects
Signal and V
Current-limit
Video and high-frequency
Glitch and delay from
FORCE inputs
V
frequency
sensitivity to parasitic
capacitance
distortions
IN
characteristics and
SO-14
g
G
15V supplies at 75 C but additional
operating range
g
surface-mount
5V to
g
12V levels
Signal path DC distoritons
V
V
100% gain error
FORCE operation
Manufacturing tolerances
Supply voltage effects
Slewrate limitations
Noise
Power supply interactions
GAIN
GAIN
delay
package
g
I-V characteristics
overdrive recovery
15V supplies
has
a