Family of Programmable Analog Video Signal Processors by TI

Texas Instruments Incorporated introduced three integrated high-performance video amplifiers.

These new three-channel devices are the first to offer full I2C programmability of all functions independently for each channel, which provides the designer the flexibility to configure a video system as required or on-the-fly, without the need for hardware upgrades or modifications.

The devices are designed with integrated Butterworth filters to provide all the analog signal conditioning required in video applications such as set-top boxes, digital televisions, personal video recorders/DVD readers and portable USB devices.

Key Features of the THS73x3 Family Manufactured in TI's proprietary BiCom3 complementary bipolar silicon germanium process, the THS7303, THS7313 and THS7353 feature 2.7 V to 5 V single-supply operation and are as much as 20x lower power than competing amplifiers. For example, total quiescent current at 3.3 V for the THS7353 is 16.2 mA and total power is 54 mW. This reduces system thermal issues, increases long-term reliability and provides a key benefit for customers designing environmentally-friendly products. In addition, the devices share the following key features:
* 2:1 input MUX
* Integrated 5th order low pass filters with Butterworth characteristics, which strikes a balance between group delay and attenuation
* Selectable input bias modes and rail-to-rail outputs to allow for a variety of AC and DC coupled modes
* Individual channel disable and independent channel mute control
* When all channels are disabled, the current is 0.1 uA

The THS7303 and THS7313 are video line driver output devices configured in a gain of 6 dB with SAG correction, and they are capable of driving up to two doubly-terminated 75 ohms video lines. The THS7303 integrates I2C-programmable 9-, 16- and 35-MHz digital-to-analog converter (DAC) reconstruction filters for standard-definition digital television (SDTV), enhanced-definition
television (EDTV) and high-definition television (HDTV), and a 190-MHz filter bypass mode for 1080p or SXGA/UXGA video standards. The THS7313 includes a fixed 9-MHz filter for SDTV.

The THS7353 is a video input device containing analog-to-digital converter anti-aliasing filter modes selectable at 9-, 16-, and 35-MHz along with a 150-MHz bypass mode. The THS7353 unity gain amplifier can be configured with external resistors for gains up to 14dB to allow compensation of skin effect losses on cables or SinX/X DAC compensation.

The THS73x3 devices join TI's extensive offering of high-performance analog and digital signal processor products for video applications, including DaVinci products optimized for digital video systems. TI provides the silicon, software, systems expertise and support for customers' video designs, enabling them to get to market quickly.

write your comments about the article :: 2005 Computing News :: home page