The MAX9597 from Maxim is a fully integrated, +3,3 V SCART solution for set-top boxes and A/V receivers that have one SCART connector.
Designed to enable greener consumer applications, this device utilises innovative power-saving technology to dramatically reduce power consumption. Maxim’s patented DirectDrive technology enables the device to operate audio and video signals from +3,3 V, thereby eliminating the need for a +5 V supply and minimising the use of a +12 V supply.
The MAX9597 eases the routing of audio and video signals between an MPEG encoder and an external SCART connector. It integrates standard-definition video filters on all video-encoder inputs, and all audio drivers deliver a full-scale (2,0 VRMS) output. The audio section contains left and right audio paths with an independent operational amplifier at the inputs. The IC is controlled through an I²C-compatible interface.
In contrast, the MAX9597 is a complete SCART solution which operates audio and video circuitry from +3,3 V, and only requires +12 V for the slow-switching signal. DirectDrive technology employs an internal charge pump to invert the +3,3 V supply and generate a -3,3 V supply, thereby providing sufficient voltage swing to support 2,0 VRMS audio. To further reduce power consumption, the chip consumes a mere 53 mW during quiescent operation, and 5 μW in shutdown.
Conventional audio-line output drivers that operate from a single supply require series AC coupling capacitors. During power-up, the DC bias on the AC coupling capacitor moves from ground to a positive voltage. During power-down, the opposite occurs. The changing DC bias usually causes an audible transient, typically referred to as a 'click' or 'pop'.
In the MAX9597, DirectDrive audio circuitry suppresses this click-and-pop noise. With DirectDrive, the DC bias of the audio-line outputs is always at ground, regardless of whether the MAX9597 is being powered up or powered down. DirectDrive circuitry thus eliminates the need for AC-coupling capacitors on the audio outputs, thereby conserving board space, reducing system cost and improving frequency response.
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