EL2090 100MHz DC-Restored Video Amplifier
video amplifier sub-system. It contains a very high-quality
video amplifier and a nulling sample-and-hold amplifier
specifically designed to stabilize video performance. When
the HOLD logic input is set to a logic 0 during a horizontal
sync, the sample-and-hold amplifier may be used as a
general-purpose op-amp to null the DC offset of the video
amplifier. When the HOLD input goes to a logic 1 the
sample-and-hold stores the correction voltage on the hold
capacitor to maintain DC correction during the subsequent
scan line.
The video amplifier is optimized for video characteristics,
and performance at NTSC is nearly perfect. It is a currentfeedback
amplifier, so that -3dB bandwidth changes little at
various closed-loop gains. The amplifier easily drives video
signal levels into 75 loads. With 100MHz bandwidth, the
EL2090 is also useful in HDTV applications.
The sample-and-hold is optimized for fast sync pulse
response. The application circuit shown will restore the video
DC level in five scan lines, even if the HOLD pulse is only
2µs long. The output impedance of the sample-and-hold is
low and constant over frequency and load current so that the
performance of the video amplifier is not compromised by
connections to the DC restore circuitry.
The EL2090 is fabricated in Elantec's proprietary
Complementary Bipolar process which produces NPN and
PNP transistors with equivalent AC and DC performance.
The EL2090 is specified for operation over the 0°C to 75°C
temperature range.
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[ Input amplifier in video equipment ][ Restoration amplifier in video mixers ] |
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Datasheet |
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ISO9001 |
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Please see the document for details |
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PDIP SOL |
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English Chinese Chinese and English Japanese |
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August 1995 |
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Rev 0.00 |
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FN7040 |
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840 KB |
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