Features: *Complete video level restoration system
* 0.01% differential gain and 0.02§ differential phase accuracy at NTSC
* 100 MHz bandwidth
* 0.1 dB flatness to 20 MHz
* Sample-and-hold has 15 nA typical leakage and 1.5 pC charge injection
*System can acquire DCcorrection level in 10 ms, or 5 scan lines of 2 ms each, to (/2 IRE
* VS e g5V to g15V
* TTL/CMOS hold signalApplication*Input amplifier in videoequipment
* Restoration amplifier in video mixersPinout
SpecificationsVoltage between V+ and V- ............................................ 36V
Voltage between VIN-, S/HIN+,
S/HINb, CHOLD, and GND pins............................. (Va) a 0.5V
..........................................................................to (Vb) b0.5V
VOUT Current............................................................... 60 mA
Current into VINb and HOLD Pins................................... 5 mA
Current S/HOUT ............................................................16 mA
Internal Power Dissipation ...................................See Curves
Operating Ambient Temperature Range........... .....0 to 75
Operating Junction Temperature
Plastic DIP or SOL.......................................................... 150
Storage Temperature Range ........................±65 to a150DescriptionThe EL2090C is the first complete DC-restored monolithic 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 sampleand- 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 EL2090C video amplifier is optimized for video characteristics, and performance at NTSC is nearly perfect. It is a current-feedback amplifier, so that b3 dB bandwidth changes little at various
closed-loop gains. The amplifier easily drives video signal levels into 75X loads. With 100 MHz bandwidth, the EL2090 is also useful in HDTV applications.
The EL2090C 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 2 ms long. The
output impedance of the sample-and-hold is low and constant over frequency and load current so that the performance of thevideo amplifier is not compromised by connections to the DC
restore circuitry.
The EL2090C is fabricated in Elantec's proprietary Complementary Bipolar process which produces NPN and PNP transistors with equivalent AC and DC performance. The EL2090C
is specified for operation over the 0§C to 75§C temperature range.
EL2090C Data Sheet
