BA7653AF-E2

Overview

The BA7653AF-E2 is a single-circuit video signal switcher manufactured by Rohm Semiconductor, housed in an 8-SOP package. It features one 3-input to 1-output switching circuit with sync-tip clamp inputs and high input impedance (10 MΩ or more). The device operates on a supply voltage range of 4.0 V to 7.0 V, drawing a typical circuit current of 5.0 mA at 5.0 V. Key electrical parameters include a maximum output level of 3.1 V P-P, a frequency characteristic of 10 MHz at 0 dB, and interchannel crosstalk of -70 dB at 4.43 MHz. The switching speed is typically 70 ns, and the operating temperature range spans from -30°C to +80°C.

Feature Summary

• Features a 3-input to 1-output switching circuit with sync-tip clamp inputs for matching synchronous tips to the same potential.
• Supports low value clamp capacitance (minimum 3000 pF) due to high input impedance configuration.
• Enables superimposed signal application through fast switching speed and minimal switching noise.
• Allows control voltage application to the CTL pin without requiring VCC voltage.

Applications

• Video cassette recorders (VCR)
• Television sets
• Equipment utilizing display signals

Procurement Notes

Verify component authenticity and datasheet revision status before integration. Confirm that the 8-SOP package dimensions align with PCB layout requirements. Ensure thermal design accounts for power dissipation limits within the specified operating temperature range. Validate that external circuit constants provide sufficient margins for static and transient characteristics during operation.

Selection Notes

Select this component for applications requiring a single 3-input video switch with sync-tip clamping capabilities. Verify that the 4.0 V to 7.0 V supply voltage range matches the system power rails. Consider the 8-SOP package size for space-constrained designs. Ensure the control logic levels for CTLa and CTLb pins are compatible with the driving microcontroller or logic circuit.

Part Context

The BA7653AF-E2 belongs to the BA765x series of high-performance video signal switchers from Rohm Semiconductor. This series includes variants like the BA7654F (2-input) and BA7652AF (with mute function). The BA7653AF specifically provides a 3-input to 1-output configuration, distinguishing it from the 2-input models while sharing similar electrical characteristics and package options within the family.

Replacement Considerations

BA7654F: Provides a 2-input to 1-output circuit instead of 3-input; requires unused pin management if adapting to 3-input designs.

FAQ

How should unused input pins be handled when using the BA7653AF as a 2-input switch?

If used as a 2-input switch, leave one input pin open. To prevent oscillation, connect the open input pin to GND via a capacitor or directly to VCC.

What is the recommended clamp capacitor value for stable operation?

A minimum of 3000 pF is required, with a recommended value of 0.01 µF ceramic capacitor for optimal performance.

Can the CTL pin be left open during operation?

No, the CTL pin must be set to either a High or Low logic level. Leaving it open results in an indeterminate status.