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MAX903CPA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX903CPA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page High-Speed, Low-Power Voltage Comparators 8 _______________________________________________________________________________________ Applications Information Circuit Layout Because of the large gain-bandwidth transfer function of the MAX900–MAX903, special precautions must be taken to realize their full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. All decoupling capacitors (the small 100nF ceramic type is a good choice) should be mount- ed as close as possible to the power-supply pins. Separate decoupling capacitors for analog VCC and for digital VDD are also recommended. Close attention should be paid to the bandwidth of the decoupling and terminating components. Short lead lengths on the inputs and outputs are essential to avoid unwanted par- asitic feedback around the comparators. Solder the device directly to the printed circuit board instead of using a socket. Input Slew-Rate Requirements As with all high-speed comparators, the high gain-band- width product of the MAX900–MAX903 can create oscil- lation problems when the input traverses the linear region. For clean output switching without oscillation or steps in the output waveform, the input must meet mini- mum slew-rate requirements. Oscillation is largely a function of board layout and of coupled source imped- ance and stray input capacitance. Both poor layout and large-source impedance will cause the part to oscillate and increase the minimum slew-rate requirement. In some applications, it may be helpful to apply some posi- tive feedback between the output and + input. This pushes the output through the transition region cleanly, but applies a hysteresis in threshold seen at the input terminals. TTL Output and Latch Inputs The comparator TTL-output stages are optimized for dri- ving low-power Schottky TTL with a fan-out of four. When the latch is connected to a logic high level or left floating, the comparator is transparent and immediately responds to changes at the input terminals. When the latch is connected to a TTL low level, the comparator output latches in the same state as at the instant that the latch command is applied, and will not respond to sub- sequent changes at the input. No latch is provided on the MAX901. Power Supplies The MAX900–MAX903 can be powered from separate analog and digital supplies or from a single +5V supply. The analog supply can range from +5V to +10V with VEE grounded for single-supply operation (Figures 1A and 1B) or from a split ±5V supply (Figure 1C). The VDD digital supply always requires +5V. In high-speed, mixed-signal applications where a com- mon ground is shared, a noisy digital environment can adversely affect the analog input signal. When set up with separate supplies (Figure 1C), the MAX900–MAX903 isolate analog and digital signals by providing a separate AGND (VEE) and DGND. +10V +5V VCC VEE VDD OUT GND +5V VCC VEE VDD OUT GND +5V -5V +5V VCC VEE VDD OUT GND Figure 1A. Separate Analog Supply, Common Ground Figure 1B. Single +5V Supply, Common Ground Figure 1C. Split ±5V Supply, Separate Ground Typical Power-Supply Alternatives |
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