EL4089 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 EL4089
기능 DC Restored Video Amplifier
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EL4089 데이터시트, 핀배열, 회로
DC Restored Video Amplifier
 Complete video level restoration
 0 02% differential gain and 0 05
differential phase accuracy at
 60 MHz bandwidth
 0 1 dB flatness to 10 MHz
 VS e g5V to g15V
 TTL CMOS hold signal
 Input amplifier in video
 Restoration amplifier in video
Ordering Information
Part No Temp Range Package Outline
EL4089CN 0 C to a75 C 8-Pin P-DIP MDP0031
EL4089CS 0 C to a75 C 8-Lead SO MDP0027
General Description
The EL4089C is an 8-pin complete DC-restored monolithic vid-
eo amplifier sub-system It contains a high quality video ampli-
fier and a nulling sample-and-hold amplifier specifically de-
signed to stabilize video performance
When the HOLD logic input is set to a TTL CMOS logic 0 the
sample- and-hold amplifier can be used to null the DC offset of
the video amplifer
When the HOLD input goes to a TTL CMOS logic l the cor-
recting voltage is stored on the video amplifier’s input coupling
capacitor The correction voltage can be further corrected as
need be on each video line
The video amplifier is optimized for video performance and low
power Its current feedback design allows the user to maintain
essentially the same bandwidth over a gain range of nearly 10 1
The amplifier drives back-terminated 75X lines
The EL4089C is fabricated in Elantec’s proprietary Comple-
mentary Bipolar process which produces NPN and PNP tran-
sistors with equivalent AC and DC performance The EL4089C
is specified for operation over 0 C to a75 C temperature range
Connection Diagram
DC restoring amplifier with a gain of 2 restoring to ground
4089 – 1
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ‘‘controlled document’’ Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1993 Elantec Inc

EL4089 pdf, 반도체, 판매, 대치품
DC Restored Video Amplifier
Typical Performance Curves
Supply Current vs Temperature
VS e g15V
Supply Current
vs Supply Voltage
Restoring Current
vs Temperature
4089 – 2
Amplifier Input Current
vs Die Temperature
4089 – 3
Amplifier Output Voltage
vs Die Temperature
VS e g15V
4089 – 4
Amplifier Offset Voltage
vs Die Temperature
4089 – 5
4089 – 6
4089 – 7


EL4089 전자부품, 판매, 대치품
DC Restored Video Amplifier
Typical Application
The EL4089 can be used to DC-restore a video
waveform (see Fig 1) The above circuit forces
the cable driving video amplifier’s output to
ground when the HOLD pin is at a logic low
The ‘‘correction voltage’’ is stored on capacitor
CX1 an external ceramic capacitor The capaci-
tor value is chosen from the system require-
ments The typical input bias current to the vid-
eo amplifier is 1 mA so for a 62 ms hold time and
a 0 01 mF capacitor the output voltage drift is
6 2 mV in one line
The S H amplifier can provide a typical current
of 300 mA to charge capacitor CX1 so with a
1 2 ms sampling time the output can be corrected
by 36 mV in each line
Using a smaller value of CX1 increases both the
voltage that can be corrected and the drift while
being held likewise using a larger value of CX1
reduces the voltages
The RX1 resistor is in the circuit purely to simu-
late some external source impedance and is not
needed as a real component Likewise for RX2
The 75X back terminating resistor RXT is rec-
ommended when driving 75X cables
The board layout should have a ground plane un-
derneath the EL4089 with the ground plane cut
away from the vicinity of the VINb pin (pin 1)
This helps to minimize the stray capacitance on
pin 1
Power supply bypassing is important and a
0 1 mF ceramic capacitor from each power pin to
ground placed very close to the power pins to-
gether with a 4 7 mF tantalum bead capacitor is
When both digital and Analog grounds are on the
same board the EL4089 should be on the Analog
ground The digital ground can be connected to
the Analog ground through a 100X –300X resis-
tor near the EL4089 This allows the digital sig-
nal a return path while preventing the digital
noise from corrupting the analog ground
Figure 1
4089 – 19


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