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参数资料
| 型号： | EL2150CW |
| 英文描述： | 125 MHz Single Supply, Clamping Op Amps |
| 中文描述： | 125 MHz的单电源，钳位运算放大器 |
| 文件页数： | 5/20页 |
| 文件大小： | 488K |
| 代理商： | EL2150CW |
EL2150CEL2157C
125 MHz Single Supply Clamping Op Amps
Applications Information
Contd
As far as the output stage of the amplifier is con-
cerned RFa RG appear in parallel with RL for
gains other than a1 As this combination gets
smaller the bandwidth falls off Consequently
RF has a minimum value that should not be ex-
ceeded for optimum performance
For AV ea1 RF e 0X is optimum For Av e
b
1or a2 (noise gain of 2) optimum response is
obtained with RF between 500X and 1 kX For
Av eb4or a5 (noise gain of 5) keep RF be-
tween 2 k
X and 10 kX
Video Performance
For good video performance an amplifier is re-
quired to maintain the same output impedance
and the same frequency response as DC levels are
changed at the output This can be difficult when
driving a standard video load of 150
X because of
the change in output current with DC level Dif-
ferential Gain and Differential Phase for the
EL2150CEL2157C are specified with the black
level of the output video signal set to a12V
This allows ample room for the sync pulse even
in a gain of a2 configuration This results in dG
and dP specifications of 005% and 005 while
driving 150
X at a gain of a2 Setting the black
level to other values although acceptable will
compromise peak performance
For example
looking at the single supply dG and dP curves for
RLe150 X if the output black level clamp is re-
duced from 12V to 06V dGdP will increase
from 005%005 to 008%025 Note that in a
gain of a2 configuration this is the lowest black
level allowed such that the sync tip doesn’t go
below 0V
If your application requires that the output goes
to
ground
then
the
output
stage
of
the
EL2150CEL2157C like all other single supply
op amps requires an external pull down resistor
tied to ground As mentioned above the current
flowing through this resistor becomes the DC
bias current for the output stage NPN transistor
As this current approaches zero the NPN turns
off and dG and dP will increase This becomes
more critical as the load resistor is increased in
value While driving a light load such as 1 k
X if
the input black level is kept above 125V dG and
dP are a respectable 003% and 003
For other biasing conditions see the Differential
Gain and Differential Phase vs Input Voltage
curves
Output Drive Capability
In spite of their moderately low 5 mA of supply
current the EL2150CEL2157C are capable of
providing g100 mA of output current into a 10
X
load or g60 mA into 50
X With this large output
current capability a 50
X load can be driven to
g
3V with VS e g5V making it an excellent
choice for driving isolation transformers in tele-
communications applications
Driving Cables and Capacitive Loads
When used as a cable driver double termination
is always recommended for reflection-free per-
formance For those applications the back-termi-
nation
series
resistor
will
de-couple
the
EL2150CEL2157C from the cable and allow ex-
tensive capacitive drive However other applica-
tions may have high capacitive loads without a
back-termination resistor In these applications a
small series resistor (usually between 5
X and
50
X) can be placed in series with the output to
eliminate most peaking The gain resistor (RG)
can then be chosen to make up for any gain loss
which may be created by this additional resistor
at the output
DisablePower-Down
The EL2157C amplifier can be disabled placing
its output in a high-impedance state The disable
or enable action takes only about 40 nsec When
disabled
the amplifier’s supply current is re-
duced to 0 mA thereby eliminating all power
consumption by the EL2157C The EL2157C am-
plifier’s power down can be controlled by stan-
dard CMOS signal levels at the ENABLE pin
The applied CMOS signal is relative to the GND
pin For example if a single a5V supply is used
the logic voltage levels will be a05V and a20V
If using dual g5V supplies the logic levels will
be b45V and b30V Letting the ENABLE pin
float will disable the EL2157C If the power-
down feature is not desired connect the EN-
ABLE pin to the VSa pin The guaranteed logic
levels of a05V and a20V are not standard TTL
levels of a08V and a20V so care must be tak-
en if standard TTL will be used to drive the EN-
ABLE pin
13
相关PDF资料 |
PDF描述 |
|---|---|
| EL2157CN | 125 MHz Single Supply, Clamping Op Amps |
| EL2157CS | 125 MHz Single Supply, Clamping Op Amps |
| EL2157C | 125 MHz Single Supply, Clamping Op Amp(125MHz 单电源钳位运算放大器) |
| EL2160C-1 | SWITCH, ON-OFF, BLK/BLK BTN; Switch function type:SPST Latching; Voltage, contact AC max:125V; Voltage, contact DC max:24V; Temp, op. max:85(degree C); Temp, op. min:-40(degree C); Diameter, panel cut-out:13.6mm; Length / Height, RoHS Compliant: Yes |
| EL2160CN | 130 MHz Current Feedback Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2150CW-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amps |
| EL2150CW-T7A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amps |
| EL2157 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amps |
| EL2157CN | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:125 MHz Single Supply, Clamping Op Amps |
| EL2157CS | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amps |
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