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MAX4141 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4141 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page _______________Detailed Description The MAX4141 video switch is manufactured with Maxim’s proprietary complementary bipolar process that yields high bandwidth and low capacitance. To maintain a wide bandwidth, the MAX4141 incorporates a straightforward structure of input and output buffers. Make-before-break switching is employed to reduce noise and glitches, even when switching from part to part in large arrays. The input buffers provide a con- stant, high input impedance. And, they prevent the make-before-break action from feeding back to the input and causing noise and/or glitches. The design of the switching mechanism limits the inevitable glitch to within 13mVp-p. In addition, the glitch pulse is positive to avoid confusion with any neg- ative sync pulses. Unity-gain output buffers isolate other inputs from the switching action of large multiplex arrays. These buffers can drive 5k Ω resistive loads. Load capacitance is lim- ited only by system bandwidth requirements. The MAX4141 does not contain buffer latches. The digi- tal inputs control the switch transparently. __________Applications Information Grounding, Bypassing, and PC Board Layout In order to obtain the MAX4141’s full 330MHz bandwidth, Microstrip and Stripline techniques are recommended in most cases. To ensure your PC board does not degrade the switch’s performance, it’s wise to design the board for a frequency greater than 1GHz. Even with very short runs, it’s good practice to use this technique at critical points, such as inputs and outputs. Whether you use a constant-impedance board or not, observe the following guidelines when designing the board: • Do not use wire-wrap boards, because they are too inductive. • Do not use IC sockets. They increase parasitic capacitance and inductance. • In general, surface-mount components have shorter leads and lower parasitic reactance, and give better high-frequency performance than through-hole com- ponents. • The PC board should have at least two layers, with one side a signal layer and the other a ground plane. • Keep signal lines as short and as straight as possi- ble. Do not make 90° turns; round all corners. • The ground plane should be as free from voids as possible. 330MHz, 4x1 Precision Video Multiplexer 6 _______________________________________________________________________________________ ______________________________________________________________Pin Description Output Enable and device shutdown. A logic high on this pin enables the output. A logic low causes the output to assume a high-impedance state and reduces operating current. EN 9 Negative Power-Supply Voltage. Decouple to power ground. VEE 10 Signal Output OUT 11 Positive Power-Supply Voltage. Decouple to power ground. VCC 12 Channel Selection Bit. See truth tables. A1 13 Signal Input IN2 5 Signal Input IN3 7 No Connect—not internally connected. N.C. 8 Signal Input IN1 3 Analog (Signal) Ground. Since inputs are isolated by these grounds, they should be as noise-free as possible. GND 2, 4, 6 PIN Signal Input IN0 1 DESCRIPTION FUNCTION Channel Selection Bit. See truth tables. A0 14 |
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