Texas Instruments THS7318YZFT

Overview

THS7318YZFT from Texas Instruments is a 3-channel low-power analog video line driver IC designed for EDTV/SDTV signal conditioning in portable systems. It integrates three independent 3rd-order 20-MHz Butterworth DAC reconstruction filters, rail-to-rail output drivers with 6 dB gain, and low-power shutdown mode (5 µW max), operating from 2.85 V to 5 V single supply. It processes Y', P'B/CVBS, and P'R/C' signals for composite and component video output in USB-powered media players.

For engineers reviewing the THS7318YZFT datasheet, THS7318YZFT pinout, THS7318YZFT application, or THS7318YZFT equivalent, key selection criteria include its 4.5 mA max quiescent current, ±0.14% channel-to-channel gain match, 0.05% differential gain, –21 dB stop-band attenuation at 43 MHz, and DSBGA-9 NanoFree™ package compatibility with space-constrained portable designs.

Technical Context

The THS7318YZFT implements three parallel signal paths-Y', P'B/CVBS, and P'R/C'-each comprising DC offset correction, a 3rd-order Butterworth low-pass filter (0.1-dB flatness to 11 MHz, –3 dB at 20 MHz), and a rail-to-rail output buffer. The P'B/CVBS channel is uniquely configured to drive two doubly terminated 75 Ω lines, while Y' and P'R/C' channels drive one 75 Ω load each.

It features logic-controlled enable (EN) with defined thresholds (0.6 V low, 2.1 V high), shutdown current <1 µA, and input bias currents as low as –415 nA. All channels maintain 62 dB SNR and 73 dBc THD at 1 MHz under 2-VPP conditions, supporting NTSC/PAL 480i/576i SDTV and 480p/576p EDTV standards.

Key Specifications

Pinout & Package

THS7318YZFT uses a 9-pin DSBGA (NanoFree™) wafer-scale package (YZF), measuring 1.45 mm × 1.39 mm with 0.5 mm ball pitch. The bottom-side layout supports compact PCB placement and thermal performance via solder-ball conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS7314YZFT, THS7318YZFT offers lower quiescent current and smaller footprint for dedicated 3-channel use; versus LMH0387SQ/NOPB, it provides native analog signal conditioning essential for legacy display interfaces where SDI is unsupported.

Availability

THS7318YZFT is available at Aetrix Electronics and suitable for personal media players, digital cameras, and cellular phone video output applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for THS7318YZFT 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 over 90 years of innovation in high-reliability electronic components.

The THS7318YZFT belongs to TI's video line driver product line, engineered specifically for low-power, high-fidelity analog video signal conditioning in portable and USB-powered consumer electronics.

FAQ

What is the maximum operating temperature range for the THS7318YZFT?

The THS7318YZFT is specified for continuous operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD22-A108 and supports deployment in consumer handheld devices exposed to variable environmental conditions, including automotive cabin environments and outdoor digital cameras. The device's thermal resistance (θJA = 105°C/W) ensures junction temperature remains below 125°C under typical 3.3 V, 3.5 mA operating conditions on standard FR4 PCBs.

Does the THS7318YZFT require external passive components for basic operation?

The THS7318YZFT operates autonomously with only decoupling capacitors: 0.1 µF ceramic capacitors placed near Vs+ and GND pins are mandatory for stability and noise suppression. No external resistors or inductors are needed for gain setting or filtering-the 6 dB gain and 20-MHz Butterworth response are fully integrated. Input/output DC blocking capacitors are optional and depend on whether AC- or DC-coupled video architecture is used in the target design.

How does the EN pin function in the THS7318YZFT, and what happens when it is left unconnected?

The EN pin on the THS7318YZFT is an active-high enable input that places the device in 5 µW shutdown mode when driven below 0.6 V and activates full operation above 2.1 V. If left unconnected (floating), the internal state is undefined and may cause erratic behavior-including partial channel activation or increased supply current-due to noise coupling. TI explicitly states in the datasheet that EN "must be driven and cannot be left floating," so a pull-up resistor to Vs+ or direct MCU control is required for reliable operation.

Can the THS7318YZFT drive both composite (CVBS) and component (Y'P'B P'R) video simultaneously?

Yes, the THS7318YZFT supports simultaneous composite and component video output through shared input and output paths: Pin 1B accepts either P'B or CVBS input, and Pin 3B delivers corresponding P'B or CVBS output. However, the signal format must be selected externally-the device does not auto-detect or switch modes. For true simultaneous dual-output (e.g., CVBS to TV + Y'P'B P'R to monitor), external multiplexing or separate signal sources are required, as the THS7318YZFT processes one signal set per channel at a time.

What is the significance of the 150 mV DC output offset in the THS7318YZFT?

The 150 mV DC output offset in the THS7318YZFT is intentionally generated by the internal DC offset circuit to prevent output stage saturation when driving AC-coupled video loads. This bias ensures the full 2-VPP video signal swings between ~150 mV and ~2.15 V, maintaining headroom for positive and negative excursions without clipping. It eliminates the need for external clamping diodes or black-level restoration circuits in downstream receivers, simplifying system-level analog video design while preserving signal integrity across NTSC/PAL standards.