Dual/Quad/Single, High-Speed, Ultra-Low-Power,Single-Supply TTL Comparators MAX907/MAX908/MAX909 VTRIP+ LATCH V 3V V IN+ HYST VTRIP+ + VTRIP- VOS = 2 LE 1.4V COMPARE V 0V th V IN- = 0V TRIP- ts VOD VOS DIFFERENTIAL V V IN OH INPUT VOLTAGE COMPARATOR OUTPUT VOH tPD+ V OUTPUT OL 1.4V (QOUT) VOL t Figure 1. Input and Output Waveforms, Noninverting Input SKEW Varied VOH OUTPUT (QOUT) 1.4V Applications Information VOL Circuit Layout Because of the MAX907/MAX908/MAX909’s high gain Figure 2. MAX909 Timing Diagram bandwidth, special precautions must be taken to real- ize the full high-speed capability. A printed circuit Battery-Operated Infrared Data Link board with a good, low-inductance ground plane is Figure 4's circuit allows reception of infrared data. The mandatory. Place the decoupling capacitor (a 0.1µF MAX403 converts the photodiode current to a voltage, ceramic capacitor is a good choice) as close to V+ as and the MAX907 determines whether the amplifier output possible. Pay close attention to the decoupling capaci- is high enough to be called a “1”. The current consump- tor’s bandwidth, keeping leads short. Short lead tion of this circuit is minimal: The MAX403 and MAX907 lengths on the inputs and outputs are also essential to require typically 250µA and 700µA, respectively. avoid unwanted parasitic feedback around the com- parators. Solder the device directly to the printed circuit board instead of using a socket. Overdriving the Inputs The inputs to the MAX907/MAX908/MAX909 may be driven beyond the voltage limits given in the Absolute Maximum Ratings, as long as the current flowing into the device is limited to 25mA. However, if the inputs are overdriven, the output may be inverted. The addition of an external diode prevents this inversion by limiting the input voltage to 200mV to 300mV below ground (Figure 3). _______________________________________________________________________________________9 Document Outline not-recomm-data-sheet-cover.pdf Not Recommended for New Designs not-recomm-data-sheet-coverMAX909.pdf Not Recommended for New Designs
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