BH7236AF-E2

Overview

The BH7236AF-E2 is an NTSC/PAL analog video encoder manufactured by ROHM Semiconductor. It converts analog RGB component signals into six distinct video signal formats: composite video, luminance, chrominance, and individual R, G, B outputs. The device operates on a single 5.0V supply with logic inputs ranging from 3.0V to 5.0V. Key electrical parameters include a typical consumption current of 42 mA at VCC=5.0V, a white level output of 0.70 Vpp, and a burst level of 0.29 Vpp. It features built-in 75 Ω drivers for direct load driving and supports subcarrier inputs of 3.579545 MHz (NTSC) or 4.433619 MHz (PAL). The component is housed in a SOP-24 package.

Feature Summary

• Converts analog RGB signals into composite, luminance, chrominance, and separate color channel outputs.
• Supports both NTSC and PAL television standards via external pin selection.
• Integrates internal 75 Ω drivers for direct connection to standard video loads.
• Includes internal burst timing signal generation and PAL phase switching flip-flops.

Applications

• Video game consoles
• Television display terminals
• Video accessory devices

Procurement Notes

Verify the E2 suffix indicates embossed tape and reel packaging containing 1500 pieces per reel. Confirm the specific revision A datasheet matches the production batch requirements. Ensure the ordering quantity is a multiple of the minimum reel quantity. Cross-reference the manufacturer's official documentation for any updates to the absolute maximum ratings or recommended operating conditions.

Selection Notes

Select this component when analog RGB input is required rather than digital data. Compare against the BH7240AKV if digital parallel RGB input or higher performance metrics are needed. Verify that the system can provide the necessary composite sync and subcarrier signals externally. Ensure the PCB layout accommodates the separation of analog and digital ground planes as specified in the application notes.

Part Context

The BH7236AF belongs to ROHM's Video Accessory ICs line, specifically designed as NTSC/PAL analog video encoders. The -E2 suffix denotes the specific packaging format, which is an embossed tape and reel configuration suitable for automated surface-mount assembly processes.

Replacement Considerations

The BH7240AKV serves as a functional alternative within the same family but utilizes 8-bit digital RGB inputs instead of analog signals and employs a VQFP48C package. Direct substitution requires significant circuit redesign due to interface differences.

FAQ

How is the TV output format selected?

The format is selected by connecting the NT/PAL terminal to a high logic level for NTSC or a low logic level for PAL.

What is the function of the YTRAP terminal?

The YTRAP terminal connects to an external LC filter to eliminate chrominance components from the luminance signal, thereby reducing cross-color artifacts in the composite video output.

Can the device operate without initialization?

Yes, the datasheet specifies that unnecessary initialization is not required for operation.