SN761677DAR

Video Processing Overview

The SN761677DAR is a single-chip synthesized tuner IC designed for TV/VCR tuning systems, manufactured by Texas Instruments. It integrates a PLL synthesizer, three-band local oscillators (VHF-L, VHF-H, UHF), and a mixer within a 38-pin TSSOP package. The device operates on a 5-V supply voltage and includes an integrated 30-V DC/DC converter to drive the tuning amplifier. Control is managed via an I2C bus protocol supporting four data bytes transmission. Key electrical parameters include a 4-MHz crystal oscillator input, a 15-bit programmable counter, and a reference divider ratio selectable at 31.25 kHz, 50 kHz, or 62 kHz.

Video Processing Feature Summary

• Integrates a PLL synthesizer, three-band local oscillators, and a mixer into a single chip.
• Includes a low-noise 30-V DC/DC converter specifically for powering the tuning amplifier.
• Features four NPN emitter follower band switch drivers and four NPN open collector ports.
• Supports I2C bus control with a programmable reference divider ratio.

Video Processing Applications

• TV/VCR tuning systems
• Synthesized tuner designs requiring integrated frequency synthesis
• Broadcast receiver circuits utilizing VHF and UHF bands

Video Processing Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm that the specific ordering suffix matches the required package type and temperature range. Review the latest datasheet for any updates regarding production status, as availability may change. Ensure compliance with RoHS standards if applicable to your manufacturing process. Validate pin configurations against your PCB layout before finalizing procurement orders.

Video Processing Selection Notes

Select this component when a monolithic solution for TV/VCR tuning is required to minimize board space. Consider its integration of the DC/DC converter if external high-voltage generation is undesirable. Evaluate the I2C interface compatibility with your microcontroller system. Assess the thermal performance requirements given the operating temperature range and power dissipation characteristics. Verify that the available band switch drivers meet the load requirements of your tuner circuit.

Video Processing Part Context

This part belongs to the SN761677 family of synthesized tuner ICs from Texas Instruments. It is designed to replace discrete solutions involving separate synthesizers, oscillators, and converters. The device simplifies the design of broadcast receivers by consolidating critical RF and control functions. It represents a specialized class of analog mixed-signal ICs tailored for consumer electronics applications.

Video Processing Replacement Considerations

Check for obsolete status in current TI catalogs. If unavailable, evaluate newer tuner ICs from the same manufacturer with similar I2C interfaces and band coverage. Ensure substitute parts support the required 30-V output capability for the tuning amplifier. Verify pin-to-pin compatibility if direct replacement is necessary without redesigning the PCB.

Video Processing FAQ

What is the maximum output voltage of the integrated DC/DC converter?

The integrated DC/DC converter provides a maximum output voltage of 30 V when powered by an external supply.

How is the reference divider ratio configured?

The reference divider ratio is programmable via the I2C interface, allowing selection of 31.25 kHz, 50 kHz, or 62 kHz based on the control bits.

What type of package does the SN761677DAR use?

The SN761677DAR utilizes a 38-pin Thin-Shrink Small-Outline Package (TSSOP).