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EL2018 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL2018 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 It is possible to make an oscillation resistant design by putting a short duration “0” on the LE input whenever you wish to make a comparison. This gates the comparator on only for a brief instant, long enough to compare, but not long enough to oscillate. The minimum duration of this pulse is specified by the minimum clock width parameter in the AC electrical tables. The CS input may be left floating and still produce a guaranteed logic “0” input (active). Floating the LE input will normally produce a logic “0” input also, but operation is not guaranteed. Proper RF technique suggests that these inputs be grounded or pulled to ground if they are not used. Output Stage The output stage of the EL2018 is a pair of complementary emitter followers operating as a linear amplifier. This makes the output stage of the EL2018 glitch free, and improves accuracy and stability when operating with small signals. Three-State Output, Power Saving Feature The EL2018 has an output stage which can be put into a high impedance “three-state” mode. When it is in this mode, the input stage and latch remain active, yet the device dissipates only 50% of the power used when the output is active. This has advantages in a large ATE system where there may be 1000 comparators, but only 10% are in use at any one time. Due to the power saving feature and linear output stage, the EL2018 does not have a standard TTL three-state output stage. As such one must be careful when using the three- state feature with devices other than other EL2018s or EL2019s. When operating from ±15V supplies the three- state feature is compatible with all TTL families, however CMOS families may conflict on high outputs. Since the output stage of the EL2018 turns on faster than it turns off, a 50 Ω to 100Ω resistor in series with the output will limit fault currents between devices with minimum impact on logic drive capability. System Design Considerations The most common problem users have with high speed comparators is oscillations due to output to input feedback. This can be avoided by using a ground plane, proper supply bypassing, and routing the inputs and outputs away from each other. Since the EL2018 has a gain bandwidth product of about 40GHz, layout and bypassing are important to a successful system design. A unique alternative to the EL2018 is the EL2019, with its edge triggered master/slave flip flop. Device Functions The various operating states of the EL2018 are described in the function table on page 7. EL2018 |
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