Maxim Integrated Products has released MAX9515, a smallest, lowest pin-count video filter amplifier for standard-definition (SD) video connections from portable devices to TVs. Packaged in a 1-mm x 1-mm, 4-bump UCSP, these devices feature patent pending proprietary SmartSleep technology, which reduces current consumption to 5 μA in shutdown mode. It is designed for low-power, space-constrained portable applications-such as cell phones, digital still/video cameras, and portable media players-that require a video output to a SDTV.

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Traditionally, portable device designers employed either an active- or passive-filter topology to support a video output. Passive filters can require up to five LC components, which consume valuable board space. Additionally, the typical, three-pole, LC pi filter is unable to suppress fully the high-frequency RF noise caused by the video DAC. In compact designs, unsuppressed noise can easily be coupled into other parts of the system, degrading signal quality and causing extremely difficult design problems.

As per the supplier’s data sheet, the MAX9515 combines an active-filter stage with a video amplifier to band-limit the signal and set the video-output level to drive a TV connection. Featuring a higher-order filter than competitive devices, it achieves much better attenuation of high-frequency artifacts and noise in the video-output signal. The integrated fifth-order filter features ±1dB passband flatness up to 9 MHz and 50 dB attenuation at 27 MHz, thereby ensuring signal integrity in ultra-compact designs.

Additionally, MAX9515 employs SmartSleep technology to maximize battery life and save board space. According to Maxim, SmartSleep circuitry constantly monitors the video input for a valid video signal and the video output for the presence of a load. It only turns on and enters its full operating mode when it detects both video playback and a live connection to the TV. In shutdown mode, this circuitry disables the filter and output amplifier, reducing power consumption to an ultra-low 5 μA.

Consequently, MAX9515 intelligently manages power consumption with no external intervention from a host processor or microcontroller. And eliminates the need for external shutdown circuitry. Thus, consuming 30% smaller board space than competitive active-filter amplifiers, and 50% less space as compared to passive-filter solutions.

The MAX9515 operates from a 2.7 V to 3.6 V supply and is fully specified over the -40 °C to +125 °C temperature range. Prices start at $0.55, in pieces of 1000 and up. Maxim said that samples are available now for qualified customers.

www.maxim-ic.com