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EL2276CS Datasheet(PDF) 11 Page - Elantec Semiconductor |
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EL2276CS Datasheet(HTML) 11 Page - Elantec Semiconductor |
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11 / 20 page  EL2176CEL2276C 70 MHz1 mA Current Mode Feedback Amp wDisable Applications Information Contd back and gain resistors further exacerbates the problem by further lowering the pole frequency The EL2176CEL2276C have been specially de- signed to reduce power dissipation in the feed- back network by using large 10 k X feedback and gain resistors With the high bandwidths of these amplifiers these large resistor values would nor- mally cause stability problems when combined with parasitic capacitance but by internally can- celing the effects of a nominal amount of parasit- ic capacitance the EL2176CEL2276C remain very stable For less experienced users this fea- ture makes the EL2176CEL2276C much more forgiving and therefore easier to use than other products not incorporating this proprietary cir- cuitry The experienced user with a large amount of PC board layout experience may find in rare cases that the EL2176CEL2276 C have less band- width than expected In this case the inverting input may have less parasitic capacitance than expected by the internal compensation circuitry of the EL2176CEL2276C The reduction of feed- back resistor values (or the addition of a very small amount of external capacitance at the in- verting input eg 05 pF) will increase band- width as desired Please see the curves for Fre- quency Response for Various RF and RG and Frequency Response for Various CINb Feedback Resistor Values The EL2176CEL2276C have been designed and specified at gains of a1 and a2 with RF e 10 k X This value of feedback resistor gives 70 MHz of b3 dB bandwidth at AV ea1 with about 15 dB of peaking and 60 MHz of b3dB bandwidth at AV ea2 with about 05 dB of peaking Since the EL2176CEL2276C are cur- rent-feedback amplifiers it is also possible to change the value of RF to get more bandwidth As seen in the curve of Frequency Response For Various RF and RG bandwidth and peaking can be easily modified by varying the value of the feedback resistor Because the EL2176C is a current-feedback am- plifier the gain-bandwidth product is not a con- stant for different closed-loop gains This feature actually allows the EL2176CEL2276C to main- tain about the same b3 dB bandwidth regard- less of closed-loop gain However as closed-loop gain is increased bandwidth decreases slightly while stability increases Since the loop stability is improving with higher closed-loop gains it becomes possible to reduce the value of RF below the specified 10 kX and still retain stability resulting in only a slight loss of bandwidth with increased closed-loop gain Supply Voltage Range and Single- Supply Operation The EL2176CEL2276C have been designed to operate with supply voltages having a span of greater than 3V and less than 12V In practical terms this means that the EL2176CEL2276C will operate on dual supplies ranging from g15V to g6V With a single-supply the EL2176C will operate from a3V to a12V As supply voltages continue to decrease it be- comes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages The EL2176CEL2276C have an input voltage range that extends to with- in 1V of either supply So for example on a sin- gle a5V supply the EL2176CEL2276C have an input range which spans from 1V to 4V The out- put range of the EL2176C EL2276C is also quite large extending to within 1V of the supply rail On a g5V supply the output is therefore capable of swinging from b4V to a4V Single-supply output range is even larger because of the in- creased negative swing due to the external pull- down resistor to ground On a single a5V sup- ply output voltage range is about 03V to 4V 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 is especially difficult when driving a standard video load of 150 X be- cause of the change in output current with DC level Until the EL2176CEL2276C good Differ- ential Gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance) These currents were typically in excess of the 11 |
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