Electronic Components Datasheet Search |
|
MAX9042 Datasheet(PDF) 9 Page - Maxim Integrated Products |
|
MAX9042 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page Detailed Description The MAX9039–MAX9043 and MAX9050–MAX9053 fea- ture single/dual, low-power, low-voltage comparators and a precision voltage reference. They operate from a single 2.5V to 5.5V (MAX9039/MAX904_) or 2.7V to 5.5V (MAX905_) supply. The single comparators with reference, (MAX9039/MAX9040/MAX9041/MAX9050/ MAX9051 consume only 40µA of supply current, while the dual comparators with reference (MAX9042/ MAX9043/MAX9052/MAX9053) consume only 55µA of supply current. Their common-mode input range extends 0.25V beyond each rail. Internal hysteresis ensures clean output switching, even with slow-moving input signals. The output stage employs a unique design that mini- mizes supply current surges while switching, virtually eliminating the supply glitches typical of many other comparators. Large internal output drivers allow rail-to- rail output swing that can sink and source up to 8mA of current. The precision reference uses a proprietary curvature- correction circuit and laser-trimmed thin-film resistors, resulting in a temperature coefficient of less than 30ppm/°C over the extended temperature range and initial accuracy of 0.4% (A grade). The reference output voltage is set to 1.23V in the MAX9039, 2.048V in the MAX9040–MAX9043, and to 2.500V in the MAX9050–MAX9053. Comparator Input Stage Circuitry The devices’ input common-mode range extends from (VEE - 0.25V) to (VCC + 0.25V). These comparators may operate at any differential input voltage within these lim- its. Input bias current is typically 1.0pA if the input volt- age is between the supply rails. Comparator inputs are protected from overvoltage by internal body diodes connected to the supply rails. As the input voltage exceeds the supply rails, these body diodes become forward biased and begin to conduct. Consequently, bias currents increase exponentially as the input volt- age exceeds the supply rails. Comparator Output Stage Circuitry The comparators in these devices contain a unique output stage capable of rail-to-rail operation with loads up to 8mA. Many comparators consume orders-of-mag- nitude more current during switching than during steady-state operation. However, with this family of com- parators, the supply current change during an output transition is extremely small. The Typical Operating Characteristics graph Supply Current vs. Switching Frequency shows the minimal supply current increase as the output switching frequency approaches 1MHz. This characteristic reduces the need for power-supply filter capacitors to reduce glitches created by compara- tor switching currents. Another advantage realized in high-speed, battery-powered applications is a substan- tial increase in battery life. Applications Information Additional Hysteresis These comparators have ±3mV internal hysteresis. Additional hysteresis can be generated with two resis- tors using positive feedback (Figure 1). Use the follow- ing procedure to calculate resistor values: 1) Calculate the trip points of the comparator using these formulas: and VTH is the threshold voltage at which the comparator switches its output from high to low as VIN rises above the trip point. VTL is the threshold voltage at which the comparator switches its output from low to high as VIN drops below the trip point. 2) The hysteresis band will be: VV R RR TL REF =− + 1 2 12 VV VV R RR TH REF CC REF =+ − () + 2 12 Micropower, Single-Supply, UCSP/SOT23 Comparator + Precision Reference ICs _______________________________________________________________________________________ 9 MAX9039–MAX9043 MAX9050–MAX9053 OUT IN+ IN- R2 R1 VIN VREF VCC VEE VCC Figure 1. Additional Hysteresis VV V V R RR HYS TH TL CC =− = + 2 12 |
Similar Part No. - MAX9042 |
|
Similar Description - MAX9042 |
|
|
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 |