TI's lowest power video ampifiers

2nd October 2008

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Datasheet

Texas Instruments has introduced a flexible four-channel video buffer that consumes 57 percent less power than its closest competitor. The new device also includes a power-down feature to lower system power consumption even more and help enable manufacturers to achieve ENERGY STAR compliance in set-top boxes (STBs) and personal and digital video recorders (PVRs and DVRs). The balance of ultra-low power and reduced space and cost also makes the amplifier well-suited for video surveillance systems and SCART audio/video connectors. Available development tools help manufacturers easily configure and test the amplifier for SCART applications, eliminating the need for costly components.

The THS7374 and THS7375 support a wide supply voltage range of +2.85 V to +5.5 V, providing designers with maximum flexibility while consuming minimal power. The devices feature a 9.6-mA total quiescent current at 3.3-V supply for all four channels. Even operating at 5 V, each device consumes only 10 mA total quiescent power. A power-down option further reduces quiescent current consumption to 0.1-uA, making the THS7374/5 ideal choices for consumer device systems seeking ENERGY STAR compliance.

Further adding to the devices’ flexibility, the THS7374/5 video amplifiers also include a 6th order 9.5-MHz Butterworth filter used as a digital-to-analog converter (DAC) reconstruction filter or an analog-to-digital converter (ADC) anti-aliasing filter to deliver higher quality analog video outputs or inputs. The filter is well-suited for SDTV video, allowing the THS7374/5 to simultaneously support a composite (CVBS) video channel, along with three channels to support s-video and component Y'U'V', G'B'R' (R'G'B'), or Y'P'BP'R 480i/576i. Additionally, the filter can be bypassed to provide a 150-MHz amplifier bandwidth to support wider bandwidth signals. The THS7374/5 supports multiple input and output configurations for either AC- or DC-coupled applications. On the output side, the devices’ deliver 80 mA output current drive capability, which can drive two lines per channel or 75-Ohm loads. In addition, the THS7374’s rail-to-rail output stage includes a 6-dB gain for video line driving.

Extending TI’s offering for video designs TI complements its video amplifiers with its suite of DaVinciTM digital media processors. The THS7375 provides a 15-dB output gain, enabling SDTV-compliant outputs from the processor and providing power savings and analog signal filtering to improve analog video quality.

In addition, TI provides a host of signal chain and power management devices to be used in conjunction with the THS7374/5 to help manufacturers meet ENERGY STAR requirements in a STB design, including the recently introduced TPS54331, a 3-A 28-V DC/DC converter with Eco-mode™ light load efficiency.