BA7657F-E2

Overview

The BA7657F-E2 is a triple-circuit video signal switcher designed for high-resolution display devices. It operates on a single 5 V power supply with a typical circuit current of 35 mA and a maximum rating of 8.0 V. The device features wide-range RGB signal switches with a cutoff frequency of 230 MHz, alongside dedicated switching circuits for HD and VD synchronization signals. A key functional block is the built-in separation (BUNRI) circuit that extracts synchronization signals superposed on the G signal. The component is housed in an SOP-24 package and supports an operating temperature range from -25°C to +75°C.

Feature Summary

• Integrates wide-bandwidth analog switches for dual-channel RGB signal routing.
• Includes digital switching circuits for horizontal and vertical synchronization signals.
• Features a dedicated synchronization signal separation block for composite sync extraction.

Applications

• PC monitors
• HDTVs (high definition televisions)
• Plasma displays
• LCD monitors

Procurement Notes

Verify the specific ordering suffix E2 to confirm the embossed tape and reel packaging format containing 2000 units per reel. Ensure compatibility with SOP-24 surface mount footprints during board layout. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component when designing input blocks for advanced display devices requiring simplified RGB and synchronization signal routing. The integrated sync separation circuit reduces external component count compared to discrete solutions. Verify that the 230 MHz bandwidth meets the requirements for the target resolution and refresh rate applications.

Part Context

The BA7657F belongs to ROHM's high-performance video signal switcher family, developed specifically for PC monitors and HDTVs. It shares architectural similarities with the BH7659FS but lacks the I2C bus switch and power-saving features found in the latter. This part focuses on analog RGB switching and digital sync handling within a single SOP-24 package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult ROHM directly for updated product availability or alternative recommendations if discontinuation occurs.

FAQ

How does the synchronization signal separation block function?

The block separates composite signals (Sync on Green) and outputs positive-electrode composite synchronization signals. If an HD signal is being input, a detector stops the separation circuit to prevent interference.

What is the recommended method for suppressing high-frequency peaks?

Insert an external resistance between 100 and 300 Ω near the output pins to suppress frequency peaks at high frequencies.

How is the switching channel selected?

Applying a high-level voltage (≥1.8V) to the CTL pin selects Input 1, while applying a low-level voltage (≤1.2V) selects Input 2.