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MAX908MJD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX908MJD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page __________Applications Information Circuit Layout Because of the MAX907/MAX908/MAX909’s high gain bandwidth, special precautions must be taken to real- ize the full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. Place the decoupling capacitor (a 0.1µF ceramic capacitor is a good choice) as close to V+ as possible. Pay close attention to the decoupling capaci- tor’s bandwidth, keeping leads short. Short lead lengths on the inputs and outputs are also essential to avoid unwanted parasitic feedback around the com- parators. Solder the device directly to the printed cir- cuit 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 addi- tion of an external diode prevents this inversion by limit- ing the input voltage to 200mV to 300mV below ground (see Figure 3). Battery-Operated Infrared Data Link Figure 4's circuit allows reception of infrared data. The MAX403 converts the photodiode current to a voltage, and the MAX907 determines whether the amplifier output is high enough to be called a “1”. The current consump- tion of this circuit is minimal: The MAX403 and MAX907 require typically 250µA and 700µA, respectively. Single/Dual/Quad High-Speed, Ultra Low-Power, Single-Supply TTL Comparators _______________________________________________________________________________________ 9 VTRIP+ VHYST VTRIP- VIN+ COMPARATOR OUTPUT VOH VOL VTRIP+ + VTRIP- 2 VOS = VIN- = 0V Figure 1. Input and Output Waveforms, Noninverting Input Varied tPD+ tSKEW VIN VOD th ts 3V 1.4V 0 VOS VOH 1.4V VOL VOH 1.4V VOL COMPARE LATCH LE DIFFERENTIAL INPUT VOLTAGE OUTPUT (QOUT) OUTPUT ( QOUT) Figure 2. MAX909 Timing Diagram |
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