Video amplifiers

25 July 2012 Analogue, Mixed Signal, LSI

Analog Devices has introduced a series of high-speed video amplifiers that integrate short-to-battery protection and fault detection for analog video systems in automotive safety and infotainment applications.

Housed in 3 x 3 mm packages, the devices reduce board space compared to fully discrete solutions and are ideal for space-constrained applications, such as rear-view cameras.

The ADA4830-1 (single-channel) and ADA4830-2 (dual-channel) video difference amplifiers, and ADA4432-1 (single-ended output) and ADA4433-1 (differential output) analog video filter amplifiers, provide designers with a complete chipset for transporting analog video signals over shielded and unshielded twisted pair cables.

The ICs can also be used independently to provide receiver (ADA4830-1/2) and transmitter (ADA4432-1/33-1) functions as part of a video signal chain. They feature integrated short-to-ground protection, fault detection, wide common-mode voltage ranges and robust ESD performance.

The ADA4830-1 and ADA4830-2 video difference amplifiers are designed for use as receivers of CVBS (Composite Video Blanking and Synchronous) signals in standard-definition PAL/NTSC video applications. In addition to integrated short-to-battery (input) protection up to 18 V on a single 3 V to 5 V supply, the devices include a short-to-battery flag that indicates the presence of a fault condition at the input.

The ADA4830-1 and ADA4830-2 also have ESD tolerance up to ±8 kV Human Body Model (HBM), a wide input common-mode voltage range that extends to

-8,5 V below ground and 55 dB common mode rejection at 7 MHz.

The ADA4432-1 (single-ended output) and the ADA4433-1 (differential output) analog video filter amplifiers are designed as transmitters for automotive analog video filtering applications. They feature the same 18 V short-to-battery protection (output), fault flags and ±8 kV HBM tolerance as the ADA4830.

Additionally, they feature continuous output short-to-ground protection and include a high-order video filter with a -3 dB cutoff frequency at 10 MHz and 45 dB of rejection at 27 MHz.

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