SN761681DBTR

Video Processing Overview

The SN761681DBTR is a synthesized TV tuner IC manufactured by Texas Instruments, designed for television tuning systems. It integrates a PLL synthesizer, three-band local oscillator and mixer, a 30-V output tuning amplifier, four NPN band-switch drivers, and a 15-bit programmable counter with a reference divider. The device operates on a 5-V power supply and supports an I2C bus protocol for bidirectional data transmission. It features selectable reference divider ratios of 512, 640, or 1024 to determine the tuning step frequency based on a 4-MHz crystal oscillator. The component is housed in a 30-pin TSSOP package.

Video Processing Feature Summary

• Integrates a single-chip mixer, oscillator, and PLL synthesizer with a 30-V tuning voltage output.
• Features a three-band local oscillator supporting VHF-LOW, VHF-HIGH, and UHF bands.
• Includes four NPN-type band-switch drivers for external circuit control.
• Utilizes an I2C bus protocol for bidirectional data transmission and register configuration.

Video Processing Applications

• Television (TV) systems
• VCR/DVD recorders
• Set-top boxes

Video Processing Procurement Notes

Verify that the specific ordering suffix 'DBTR' corresponds to the tape-and-reel packaging format containing 2000 units per reel. Confirm the active status of the component through official manufacturer channels before finalizing procurement plans. Ensure compatibility with standard lead-free soldering processes as indicated by RoHS compliance documentation.

Video Processing Selection Notes

Select this component for applications requiring a fully integrated solution for VHF and UHF television signal processing. The inclusion of internal oscillators and mixers reduces the need for discrete RF components. Verify that the system design accommodates the required 5-V supply voltage and utilizes the I2C interface for digital control logic integration.

Video Processing Part Context

This part belongs to the SN761681 series of TV tuner ICs from Texas Instruments. The 'DBT' designation indicates the 30-pin Thin-Shrink Small-Outline Package (TSSOP), while the 'R' suffix specifies the reel packaging variant. This family is engineered specifically for consumer electronics requiring compact form factors and simplified RF front-end architectures.

Video Processing Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's latest product selection guide for potential alternatives or updated versions within the same functional category.

Video Processing FAQ

What is the function of the AS pin?

The AS pin serves as the address selection input, allowing the setting of different I2C addresses via high, mid, or low voltage levels applied to the terminal.

How is the tuning step frequency determined?

The tuning step frequency is selectable by configuring the reference divider ratio, which can be set to 512, 640, or 1024 using the I2C control bits.