Analog Security Camera

Camera: Surveillance Analog Solutions from Texas Instruments

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Reference Designs


What's New

LM3S1937 - Stellaris microcontroller

SN65HVD96 - SymPol Transceiver for Error-free Connection


Motor control algorithms allow security operators to move the camera through a joystick interface. Several of these proven programs are included in the motor control library of TI's TMSF280x and Stellaris motor control MCUs to help you expedite your design. Software also creates a timestamp that shows the name of the camera, date and time. Timestamping the image from the camera minimizes the ability of external tampering with the video feed at the operator level. In the audio signal path the software filters and modifies the sensitivity of the data converters, and also accounts for synchronizing audio and video.

Video quality:

Besides the intrinsic dependence on the imager quality, the video is heavily affected by ambient light and temperature levels. TI's TPS7xxx family provides the efficiency needed to avoid heavy heat loses when powering the video signal path, keeping the board cool and noise to a minimum.

Consumers are generally willing to pay a premium for cameras that work in all lighting conditions. Some surveillance systems add LEDs throughout the space surveyed while others embed them around the imager. The number of LEDs to use depends on the target distance, as well the size and type of imager. There are different requirements for color, black and white and infra red imagers. The best way to determine how many LEDs to use continues to be empirical illumination to the desired spec. TI's TPS54xx/TPS402xx can efficiently provide the conversion to drive the LEDs. Most today's cameras have D1 (720x486) resolution with trends towards 720p (1280x720 progressive) and higher resolutions. Main-stream cameras used in gas stations and some of the retail environment have to meet a minimum threshold of video quality (typically CIF).

System Audio:

The noise level of a busy store or an intersection is constantly changing. The LM3Sxxxx with integrated data converters are ideal for processing of sound, and pre-filtering the signal to adjust the data converter sensitivity to the noise floor. OPA36x buffer family and the DRV13x/DRV600 audio drivers ensure that the signal fidelity is maintained over the transmission path.


Most of the surveillance plug in systems work with feed voltages of 12 or 24 V. Additional constraints for power consumption go hand in hand with limitations in the heat the electronics can dissipate in the small camera housing. This is particularly important because the CCD imager captures ten times more noise for every degree above the specified temperature. Converters are especially good to power motors because they are efficient and avoid extra heat (when compared with LDOs). LDOs are used to power video and audio amplifiers because they provide low-ripple power rails leading to better signal fidelity.

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Application Notes (7)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 23 Apr 2012 466
HTM 8 KB 10 Sep 2008 282
HTM 8 KB 28 Nov 2007 153
HTM 8 KB 25 Oct 2007 2875
HTM 8 KB 20 Dec 2006 1171
HTM 9 KB 17 Jan 2005 2510
HTM 8 KB 24 May 2004 44902

User Guides (1)

Title Abstract Type Size (KB) Date Views
htm 8 KB 07 Jul 2010 462

Selection and Solution Guides

Solution Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 2.05 MB 31 Oct 2014 21543

Product Bulletin & White Papers

White Papers (1)

Title Abstract Type Size (MB) Date Views
PDF 667 KB 05 Mar 2012 1482

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