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EL4453C Datasheet(PDF) 10 Page - Elantec Semiconductor |
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EL4453C Datasheet(HTML) 10 Page - Elantec Semiconductor |
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10 / 12 page  EL4453C Video Fader Fade-Control Characteristics The quantity VFADE in the above equations is bounded as b1 s VFADE s 1 even though the externally applied voltages often exceed this range Actually the gain transfer function around b1V and a1V is ‘‘soft’’ that is the gain does not clip abruptly below the 0%-VFADE volt- age or above the 100% – VFADE level An over- drive of 03V must be applied to VFADE to obtain truly 0% or 100% Because the 0% e or 100%- VFADE levels cannot be precisely determined they are extrapolated from two points measured inside the slope of the gain transfer curve Gener- ally an applied VFADE range of b15V to a15V will assure the full span of numerical b 1 s VFADE s 1 and 0 s F s1 The fade control has a small-signal bandwidth equal to the VIN channel bandwidth and over- load recovery resolves in about 20 ns Input Connections The input transistors can be driven from resistive and capacitive sources but are capable of oscilla- tion when presented with an inductive input It takes about 80 nH of series inductance to make the inputs actually oscillate equivalent to four inches of unshielded wiring or about six inches of unterminated input transmission line The oscil- lation has a characteristic frequency of 500 MHz Often placing one’s finger (via a metal probe) or an oscilloscope probe on the input will kill the oscillation Normal high frequency construction obviates any such problems where the input source is reasonably close to the fader input If this is not possible one can insert series resistors of around 51 X to de-Q the inputs Signal Amplitudes Signal input common-mode voltage must be be- tween (Vb) a 25V and (Va) b 25V to ensure linearity Additionally the differential voltage on any input stage must be limited to g6V to pre- vent damage The differential signal range is g 2V in the EL4453C The input range is sub- stantially constant with temperature The Ground Pin The ground pin draws only 6 mA maximum DC current and may be biased anywhere between (Vb) a25V and (Va) b 35V The ground pin is connected to the IC’s substrate and frequency compensation components It serves as a shield within the IC and enhances input stage CMRR and channel-to-channel isolation over frequency and if connected to a potential other than ground it must be bypassed Power Supplies The EL4453C works well on any supplies from g 3V to g15V The supplies may be of different voltages as long as the requirements of the GND pin are observed (see the Ground Pin section for a discussion) The supplies should be bypassed close to the device with short leads 47 mF tanta- lum capacitors are very good and no smaller by- passes need be placed in parallel Capacitors as small as 001 mF can be used if small load cur- rents flow Singe-polarity supplies such as a12V with a5V can be used where the ground pin is connected to a 5V and Vb to ground The inputs and outputs will have to have their levels shifted above ground to accommodate the lack of negative sup- ply The dissipation of the fader increases with power supply voltage and this must be compatible with the package chosen This is a close estimate for the dissipation of a circuit PDe2cVS maxcVSa(VSbVO)cVO RPAR where IS max is the maximum supply current VS is the g supply voltage (assumed equal) VO is the output voltage RPAR is the parallel of all resistors loading the output 10 |
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