Texas Instruments THS7314DG4

Overview

THS7314DG4 from Texas Instruments is a 3-channel SDTV video amplifier with integrated 5th-order 8.5-MHz Butterworth low-pass filters, 6-dB fixed gain (2 V/V), rail-to-rail output stage, and support for DC-coupled or AC-coupled (sync-tip clamp) inputs. It operates from a single 3-V to 5-V supply, draws only 16 mA at 3.3 V, and drives dual 75-Ω video lines-ideal for CVBS, S-Video Y'/C', and 480i/576i Y'P'BP'R outputs in set-top boxes and portable video systems.

For engineers reviewing the THS7314DG4 datasheet, THS7314DG4 pinout, THS7314DG4 application, or THS7314DG4 equivalent, key selection criteria include its 8.5-MHz filter bandwidth, 0.1% differential gain/0.1° differential phase accuracy, 285-mV DC output level shift, 75-Ω line-driving capability, and SOIC-8 RoHS-compliant package compatibility with legacy video signal chains.

Technical Context

The THS7314DG4 implements three independent video buffer channels using SiGe BiCom-III process technology, each incorporating a 5th-order Butterworth low-pass filter optimized for SDTV reconstruction (CVBS, S-Video, Y'P'BP'R, G'B'R') with –3 dB at 8.5 MHz and 47 dB attenuation at 27 MHz. Its input biasing supports DC coupling with 285-mV output level shift or AC coupling with transparent sync-tip clamp functionality.

Each channel delivers fixed 6-dB gain (2 V/V) with rail-to-rail output swing-within 100 mV of rails-and drives up to two 75-Ω loads simultaneously. The device achieves 0.1% differential gain and 0.1° differential phase error under NTSC/PAL conditions, enabling broadcast-grade SD video fidelity without external passive filtering or gain-setting components.

Key Specifications

Pinout & Package

THS7314DG4 is housed in an SOIC-8 (D) package compliant with RoHS and green manufacturing standards. Pin spacing is 1.27 mm, body width 3.9 mm, and total footprint 4.9 × 6.0 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-channel SDTV video buffer applications.

Compared with THS7314DG4, THS7316DR offers extended bandwidth but sacrifices SDTV-optimized sync-tip accuracy, while LMH6738MA/NOPB provides raw speed and configurability at the cost of added BOM count, layout complexity, and power-making THS7314DG4 the optimal choice for cost-sensitive, space-constrained, and standards-compliant SDTV line driving.

Availability

THS7314DG4 is available at Aetrix Electronics and suitable for set-top box output buffering, PVR/DVDR output buffering, and USB/portable low-power video buffering requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for THS7314DG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of video signal chain expertise.

The THS7314DG4 belongs to TI's precision video amplifier product line, engineered specifically for SDTV broadcast and consumer electronics applications where filter integration, sync-tip integrity, and low-power operation are critical design requirements.

FAQ

What video standards does the THS7314DG4 support?

The THS7314DG4 supports NTSC, PAL, SECAM, and 480i/576i SDTV formats through its 5th-order 8.5-MHz Butterworth filter. It is explicitly designed for CVBS, S-Video (Y'/C'), Y'P'BP'R, G'B'R', and Y'U'V' signals. Its 0.1% differential gain and 0.1° differential phase meet broadcast-grade requirements for these standards, and the device maintains performance across the full –40°C to +85°C operating range specified in the THS7314DG4 datasheet.

Can THS7314DG4 drive two 75-Ω loads simultaneously per channel?

Yes, THS7314DG4 is rated to drive up to two 75-Ω video lines per channel with rail-to-rail output swing and minimal distortion. Its output stage delivers sufficient current (≥80 mA sourcing, ≥70 mA sinking at 3.3 V) and maintains <0.1° differential phase error even under dual-load conditions. This capability is confirmed in the THS7314DG4 Electrical Characteristics tables and Application Information section, eliminating the need for external buffers in standard SDTV distribution architectures.

How does the THS7314DG4 handle DC-coupled inputs with 0-V sync tips?

The THS7314DG4 incorporates a built-in 285-mV DC output level shift that ensures a 290-mV output for a 0-V input-preserving full sync-tip amplitude and preventing clipping in downstream AGC circuits. This feature is active in DC-coupled mode and is intrinsic to the THS7314DG4 architecture, as documented in the Functional Diagram and Electrical Characteristics (Biased Output Voltage parameter). No external components are required to achieve this behavior.

Is THS7314DG4 pin-compatible with other devices in the THS73xx family?

THS7314DG4 shares the same SOIC-8 (D) package and pinout with THS7313DG4 and THS7315DG4, but functional differences exist: THS7313DG4 lacks integrated filtering, THS7315DG4 features 10-MHz filters and higher quiescent current. While physical pin compatibility exists, signal routing and system-level performance (e.g., filter response, power, and biasing) differ. Always verify functional alignment using the THS7314DG4 datasheet before substitution.

What is the recommended power supply decoupling for THS7314DG4?

Texas Instruments specifies a minimum 0.1 µF ceramic capacitor placed as close as possible to the +Vs (Pin 4) and GND (Pin 5) pins of THS7314DG4 to suppress high-frequency noise and prevent oscillation. Additionally, a bulk capacitor (22 µF to 100 µF) should be placed on the main supply rail to attenuate 50/60 Hz line interference. These requirements are detailed in the THS7314DG4 Application Information section and are essential for stable operation across temperature and load conditions.