MAX4121CSA

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX4121CSA is an SPDT buffered video switch optimized for high-definition composite video switching arrays. It operates from ±5V supplies and features a -3dB bandwidth of 330MHz with 0.1dB gain flatness to 150MHz. The device exhibits a differential phase error of 0.01° and a differential gain error of 0.01%. It provides -92dB crosstalk and -78dB off isolation at 30MHz, alongside a 700V/µs slew rate. The unit draws a maximum operating current of 5.5mA, which reduces to 250µA when disabled. It is housed in an 8-pin SO package.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Open-loop buffer amplifier architecture ensures stability when driving capacitive loads without oscillation.
• Make-before-break switching mechanism minimizes noise and glitches during channel transitions.
• Positive polarity switching glitch prevents confusion with negative sync pulses.
• On-board control logic enables direct interfacing with digital systems.

Analog Switches, Multiplexers, Demultiplexers Applications

• Video-router and crosspoint arrays
• Broadcast and HDTV-quality color signal multiplexing
• RF and IF routing
• Graphics color-signal routing

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific suffix CSA corresponds to the commercial temperature range (0°C to +70°C) and narrow SO-8 package configuration. Confirm that the ordering information matches the required pin count and functional description for the SPDT topology before finalizing procurement documentation.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring high-frequency signal integrity in video switching matrices. Ensure the design accommodates dual ±5V power supplies. Verify that the system layout supports microstrip or stripline techniques to maintain the specified 330MHz bandwidth performance.

Analog Switches, Multiplexers, Demultiplexers Part Context

This part belongs to the MAX4111/MAX4121/MAX4221 family of wideband video switches manufactured using a complementary bipolar process. While the MAX4111 is an SPST switch and the MAX4221 is a dual SPDT switch, the MAX4121 serves as the single 2-input to 1-output switch within this series.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Direct replacements within the same family include the MAX4111CSA for SPST configurations and the MAX4221CSE for dual SPDT requirements. Cross-family substitution requires verification of pin compatibility and electrical parameter alignment.

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the switching glitch affect signal integrity?

The switching transient is limited to 13mVp-p and is positive in polarity, which prevents interference with negative sync pulses commonly found in video signals.

What is the input impedance characteristic?

The device maintains a constant high input impedance, typically exceeding 100MΩ, which isolates inputs from the switching action of other channels in large arrays.

Can the outputs drive capacitive loads?

Yes, the open-loop buffer architecture allows the outputs to drive capacitive loads without oscillation, though bandwidth may be affected by the total load capacitance.