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MAX96x / MAX99x: Ultra-High-Speed,   Beyond-the-Rails Comparators <ul><li>Source: Maxim </li></ul>
Introduction <ul><li>Purpose </li></ul><ul><ul><li>An Overview Study on Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyon...
Family Overview <ul><li>Ultra-Fast, 4.5ns Propagation Delay </li></ul><ul><li>Ideal for +3V and +5V Single-Supply Applicat...
Applications <ul><li>Single 3V/5V Systems </li></ul><ul><li>Portable/Battery-Powered Systems </li></ul><ul><li>Threshold D...
Quick Selection Part Number No. of Comps. Shutdown Latch Enable Logic Output Complementary Output Supply (V) MAX961 1 Yes ...
Timing <ul><li>The added hysteresis of these devices creates two trip points: one for the rising input voltage and one for...
MAX961/MAX963 Timing Diagram <ul><li>If LE is low, the latch is transparent the comparator operates as though the latch is...
Input Stage Circuit <ul><li>The comparators include internal protection circuitry that prevents damage to the precision in...
Output Stage Circuit <ul><li>The MAX9xx devices contain a current- driven output stage. </li></ul><ul><li>During an output...
Application Circuit Level Shifter From 3V Logic to 5V Logic <ul><li>It allows the translation of bipolar ±5V logic to unip...
Applications Information <ul><li>Use a PCB with a good, unbroken, low-inductance ground plane. </li></ul><ul><li>Place a d...
Additional Resource <ul><li>For ordering the MAX9xx comparators, please click the part list or </li></ul><ul><li>Call our ...
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MAX96x/MAX99x: Ultra-High-Speed, Beyond-the-Rails Comparators

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An Overview Study on Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyond-the-Rails Comparators

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MAX96x/MAX99x: Ultra-High-Speed, Beyond-the-Rails Comparators

  1. 1. MAX96x / MAX99x: Ultra-High-Speed, Beyond-the-Rails Comparators <ul><li>Source: Maxim </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>An Overview Study on Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyond-the-Rails Comparators . </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Features </li></ul></ul><ul><ul><li>Applications </li></ul></ul><ul><ul><li>Timing Diagram </li></ul></ul><ul><ul><li>Input / Output Stage </li></ul></ul><ul><ul><li>Application circuit </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>12 pages </li></ul></ul>
  3. 3. Family Overview <ul><li>Ultra-Fast, 4.5ns Propagation Delay </li></ul><ul><li>Ideal for +3V and +5V Single-Supply Applications </li></ul><ul><li>Beyond-the-Rails Input Voltage Range </li></ul><ul><li>Low, 5mA Supply Current (MAX997/MAX999) </li></ul><ul><li>3.5mV Internal Hysteresis for Clean Switching </li></ul><ul><li>Output Latch (MAX961/MAX963) </li></ul><ul><li>TTL/CMOS-Compatible Outputs </li></ul><ul><li>Shutdown Mode (MAX961/MAX963/MAX964/MAX997) </li></ul><ul><li>Available in Space-Saving Packages: </li></ul><ul><ul><li>5-Pin SOT23 (MAX999) </li></ul></ul><ul><ul><li>8-Pin μMAX (MAX961/MAX962/MAX997) </li></ul></ul><ul><ul><li>16-Pin QSOP (MAX964) </li></ul></ul>
  4. 4. Applications <ul><li>Single 3V/5V Systems </li></ul><ul><li>Portable/Battery-Powered Systems </li></ul><ul><li>Threshold Detectors/Discriminators </li></ul><ul><li>GPS Receivers </li></ul><ul><li>Line Receivers </li></ul><ul><li>Zero-Crossing Detectors </li></ul><ul><li>High-Speed Sampling Circuits </li></ul>
  5. 5. Quick Selection Part Number No. of Comps. Shutdown Latch Enable Logic Output Complementary Output Supply (V) MAX961 1 Yes Yes CMOS TTL Yes 2.7 ~ 5.5 MAX962 2 No No No MAX963 2 Yes Yes Yes MAX964 4 Yes No No MAX997 1 Yes No No MAX999 1 No No No
  6. 6. Timing <ul><li>The added hysteresis of these devices creates two trip points: one for the rising input voltage and one for the falling input voltage as shown beside. </li></ul><ul><li>The difference between the trip points is the hysteresis. </li></ul>
  7. 7. MAX961/MAX963 Timing Diagram <ul><li>If LE is low, the latch is transparent the comparator operates as though the latch is not present. </li></ul><ul><li>The comparator’s output state is stored when LE is pulled high. </li></ul>
  8. 8. Input Stage Circuit <ul><li>The comparators include internal protection circuitry that prevents damage to the precision input stage from large differential input voltages. </li></ul><ul><li>This protection circuitry consists of two groups of three front-to-back diodes between IN+ and IN-, as well as two 200Ω resistors. </li></ul><ul><li>The diodes limit the differential voltage applied to the comparator’s internal circuitry to no more than 3V F , where V F is the diode’s forward-voltage drop. </li></ul>
  9. 9. Output Stage Circuit <ul><li>The MAX9xx devices contain a current- driven output stage. </li></ul><ul><li>During an output transition, I SOURCE or I SINK is pushed or pulled to the output pin. </li></ul><ul><li>When the output voltage reaches V OH or V OL , the source or sink current decreases to a small value, capable of maintaining the V OH or V OL in static condition. </li></ul>
  10. 10. Application Circuit Level Shifter From 3V Logic to 5V Logic <ul><li>It allows the translation of bipolar ±5V logic to unipolar 3V logic by using the MAX972. </li></ul><ul><li>This circuit requires only a single comparator with an open-drain output. </li></ul>
  11. 11. Applications Information <ul><li>Use a PCB with a good, unbroken, low-inductance ground plane. </li></ul><ul><li>Place a decoupling capacitor (a 0.1μF ceramic surface- mount capacitor is a good choice) as close to VCC as possible. </li></ul><ul><li>On the inputs and outputs, keep lead lengths short to avoid unwanted parasitic feedback around the comparators. Keep inputs away from outputs. Keep impedance between the inputs low. </li></ul><ul><li>Solder the device directly to the printed circuit board rather than using a socket. </li></ul><ul><li>For slow-moving input signals, take care to prevent parasitic feedback. </li></ul><ul><li>A small capacitor (1000pF or less) placed between the inputs can help eliminate oscillations in the transition region. </li></ul>
  12. 12. Additional Resource <ul><li>For ordering the MAX9xx comparators, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For additional inquires contact our technical service hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1481/t/al </li></ul></ul>Newark 1 Farnell 1 Newark 2 Farnell 2

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