Electronic Components Datasheet Search |
|
EL2252 Datasheet(PDF) 7 Page - Intersil Corporation |
|
EL2252 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 9 page 7 Simplified Schematic Applications Information The EL2252 is very easy to use and is relatively oscillation- free, but a few items must be attended. The first is that both supplies should be bypassed closely. 1µF tantalums are very good and no additional smaller capacitors are necessary. The EL2252 requires V- to be at least 5V to preserve AC performance. V+ must be at least 6V for a TTL output swing, 8V for CMOS outputs. The input voltage range will be referred to the more positive of the two inputs. That is, bringing an input as negative as V- will not cause problems; it's the other input's level that must be considered. The typical input range is +13/-12V when the supplies are ±15V. This range diminishes over temperature and varies with processing; it is wise to set power supplies such that V+ is 5V more positive than the most positive input signal and V- more negative than 6V below the most negative input. ±12V supplies will easily encompass all CMOS and ECL logic inputs. If the input exceeds the device's common-mode input capability, the EL2252 propagation delay and input bias current will increase. Fault currents will occur with inputs a diode below V- or above V+. No damage nor VOS shift will occur even when fault currents within the absolute maximum ratings. One of the few ways in which oscillations can be induced is by connecting a high-Q reactive source impedance to the EL2252 inputs. Such sources are long wires and unterminated coaxial lines. The source impedance should be de-Q'ed. One method is to connect a series resistor to the EL2252 input of around 100 Ω value. More resistance will calm the system more effectively, but at the expense of comparator response time. Another method is to install a “snubber” network from comparator input to ground. A snubber is a resistor in series with a small capacitor, around 100 Ω and 33pF. Each physical and electrical environment will require different treatments, although many need none. The major use of the HYS pin is to suppress noise superimposed on the input signal. By shorting the HYS pin to V- a ±30mV hysteresis is placed around the VOS of the comparator input. Leaving the pin open, or more appropriately, grounding the HYS pin removes all hysteresis. Connecting a resistor between HYS and V- allows an adjustment of the peak-to-peak hysteresis level. Unfortunately, an external resistor cannot track the internal devices properly, so temperature and unit-to-unit variations of hysteresis are increased. The relationship between the resistor and resulting hysteresis level is not linear, but a 1.5k resistor will approximately halve the nominal value. The time delay of the EL2252 will increase by about 0.7ns when using full hysteresis. The EL2252 is specifically designed to be tolerant of large inputs. It will exhibit very much increased delay times for input overdrives below 100mV. If very small overdrives must be sensed, the EL2018 or EL2019 comparators would be good choices, although they lose accuracies with signal input Slew Rates above 400V/µs. The EL2252 keeps its timing accuracy with input Slew Rates between 100V/µs and 4000V/µs of input Slew Rate. The output stage drives tens of pF load capacitances without increased overshoot, but propagation delay increases about ONE COMPARATOR EL2252 |
Similar Part No. - EL2252 |
|
Similar Description - EL2252 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |