THS7353PWG4

Overview

The THS7353PWG4 is a low-power, single-supply video buffer fabricated using SiGe BiCom-III process. It integrates three independent channels with selectable 5th-order Butterworth anti-aliasing filters (9-MHz, 16-MHz, 35-MHz) and a bypass mode offering 150-MHz bandwidth. The device supports I2C control for input selection, bias modes, and mute functions. It operates on a 2.7-V to 5-V supply with a total quiescent current of 16.2 mA at 3.3 V. Key features include a 2:1 input multiplexer per channel, external gain adjustment from 0 dB to 14 dB, rail-to-rail output, and less than 1 μA disable current.

Feature Summary

• Integrates selectable 5th-order Butterworth low-pass filters for SDTV, EDTV, and HDTV signal conditioning.
• Features individual I2C programmable control for input muxing, bias modes, and mute functions across all channels.
• Provides external analog gain adjustment capability ranging from 0 dB to 14 dB for line driving or loss compensation.
• Supports AC-coupled sync-tip clamp and DC-coupled bias modes with optional 250-mV input shift.

Applications

• HDTV video buffering for 720p/1080i signals
• PVR/DVDR video buffering
• Projector video buffering
• USB/portable low power video buffering

Procurement Notes

Verify the G4 suffix indicates lead-free/RoHS compliance as per Texas Instruments standards. Confirm the PW package designation corresponds to the 20-pin TSSOP housing. Ensure the specific revision level matches the design requirements, noting that production data reflects specifications current at publication date. Cross-reference the ordering information addendum for any updates to packaging or availability status.

Selection Notes

Select this component when multi-standard video buffering with integrated filtering is required. The I2C interface allows dynamic configuration of filter cutoff frequencies and input sources without external logic. Consider the 16.2 mA quiescent current for portable applications powered by USB or batteries. Verify that the 2:1 MUX and external gain adjust pins meet the system's flexibility needs for multiple input sources and cable loss compensation.

Part Context

This part belongs to the THS7353 series of low-power video buffers. It is manufactured using complementary silicon-germanium (SiGe) BiCom-III technology, which enables high-speed performance with low power consumption. The device is designed to replace discrete filter and amplifier solutions in modern video processing chains, simplifying board space and reducing component count for composite, S-Video, and component video interfaces.

Replacement Considerations

Direct pin-compatible replacements within the same family include THS7353PW and THS7353PWR. Verify that substitute parts maintain the same I2C address and register map if software compatibility is critical. Check datasheet revisions to ensure electrical characteristics like slew rate and distortion remain consistent for the target application frequency range.

FAQ

What are the selectable filter corner frequencies?

The THS7353 offers selectable 5th-order Butterworth filter corner frequencies of 9 MHz, 16 MHz, and 35 MHz. Additionally, the filter can be bypassed to provide a full bandwidth of 150 MHz.

How is the gain adjusted externally?

Each channel has a dedicated Gain Adjust pin. Shorting this pin to the output provides 0 dB gain. Connecting external resistors or capacitors between the Gain Adjust pin and analog ground allows for adjustable gain up to 14 dB.

What input bias modes are supported?

The device supports AC-coupled with Sync-Tip Clamp (STC), AC-coupled with fixed bias, DC-coupled, and DC-coupled with a 250-mV input offset shift. These modes are selected via I2C commands.