NJM2249M

Video Processing Overview

The NJM2249M is a 3-input to 1-output video switch IC manufactured by Nisshinbo Micro Devices Inc. It operates within a supply voltage range of 4.75V to 13.0V and features an operating current of 10.5mA typical at 5V. The device provides a bandwidth of 10MHz with a cross-talk specification of -70dB at 4.43MHz. It utilizes bipolar technology and is housed in an 8-DMP surface-mount package.

Video Processing Feature Summary

• Integrates internal sink-chip clamp function on one input terminal for fixed DC level adjustment
• Provides transistor base inputs for luminance signal control on two other terminals
• Supports wide frequency range operation with high cross-talk rejection

Video Processing Applications

• Video Cassette Recorders (VCR)
• Video Cameras
• Audio-Visual Televisions (AV-TV)
• Video Disc Players

Video Processing Procurement Notes

Verify component authenticity through authorized channels as the NJM2249M is listed as discontinued. Confirm package type matches the DMP-8 specification. Check RoHS compliance status against specific manufacturing dates, as older batches may not meet current environmental standards. Validate pin configuration compatibility before integration into existing designs.

Video Processing Selection Notes

Select this component for applications requiring three distinct video sources to be routed to a single output line. Ensure the design accommodates the 4.75V to 13V supply range. Consider the internal clamp functionality for VIN1 if DC level fixing is required without external circuitry. Verify that the 10MHz bandwidth meets the signal requirements of the target application.

Video Processing Part Context

The NJM2249 belongs to the NJM2249 series of video switch integrated circuits from Nisshinbo Micro Devices. This series includes variants such as NJM2249L, NJM2249D, and NJM2249V, which differ primarily in packaging options like DIP8, SIP8, and SSOP8 alongside the DMP8 variant. These components are designed for consumer video signal routing tasks.

Video Processing Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the component is discontinued, engineers must evaluate alternative video switches with similar 3-to-1 topology and comparable electrical specifications for system upgrades or replacements.

Video Processing FAQ

What is the function of the VIN1 terminal?

VIN1 has an internal sink-chip clamp function that allows for the fixing of the video signal's DC level.

How is the luminance level controlled?

The luminance level can be easily fixed by an outer circuit connected to the transistor base inputs at VIN2 and VIN3.

What is the recommended resistance between INPUT and GND for clamp type inputs?

A 1MΩ resistance is required between the INPUT and GND pins for clamp type inputs to prevent unstable pin voltage caused by minute currents.