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MAX9201 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX9201 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Applications Information Circuit Layout Because of the large gain-bandwidth transfer function of the MAX9201/MAX9202/MAX9203 special precau- tions 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 mounted 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 parasitic 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 MAX9201/MAX9202/ MAX9203 can create oscillation problems when the input traverses the linear region. For clean output switching without oscilla- tion or steps in the output waveform, the input must meet minimum slew-rate requirements (0.5V/s typ). Oscillation is largely a function of board layout and of coupled source impedance 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 positive feedback between the output and positive input. This pushes the output through the transi- tion region clearly, but applies a hysteresis in threshold seen at the input terminals. TTL Output and Latch Inputs The comparator TTL output stages are optimized for driving low-power Schottky TTL with a fan-out of four. When the latch is connected to a logic high level, the comparator is transparent and immediately responds to changes at the input terminals. When the latch is con- nected to a TTL low level, the comparator output latch- es (in the same state) the instant that the latch command is applied, and will not respond to subse- quent changes at the input. No latch is provided on the MAX9201. 6 _______________________________________________________________________________________ Low Cost, 7ns, Low-Power Voltage Comparators PIN SO SOT NAME FUNCTION 18 VCC Positive Analog Supply 2 7 IN+ Positive Input 3 6 IN- Negative Input 45VEE Negative Analog Supply and Substrate 54 LATCH Latch Input 6 3 GND Ground 7 2 OUT Output 81 VDD Positive Digital Supply Pin Description (continued) VEE GND VDD VCC OUT +10V +5V VEE GND VDD VCC OUT +5V VEE GND VDD VCC OUT +5V +5V -5V Typical Power-Supply Alternatives Figure 1a. Separate Analog Supply, Common Ground Figure 1b. Single +5V Supply, Common Ground Figure 1c. Split ±5V Supply, Separate Ground MAX9203 |
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