1.8V Video Amplifier Drives 2V Output

Until now video amplifiers had to operate on a 2.5V (or higher) single power supply to provide an output voltage sufficient for a 2VP-P video signal. Maxim offers DirectDrive® video amplifiers that operate on single power supplies as low as 1.8V, yet still create the full 2VP-P output range.

Operating a DirectDrive Video Amplifier on 1.8V

70% Less Power Consumed The MAX9509 consumes just 11mW of power—that is 70% less than a typical competitive device operating on a 3.3V supply. Eliminate an Analog Supply Because their high PSRR rejects the noise from a digital power supply (e.g., 49dB at 100kHz for the MAX9509/MAX9510), these DirectDrive video amplifiers can operate using a digital 1.8V supply. Lower Video DAC Power Consumption by 16x or More When using Maxim's 1.8V video amplifiers, video DAC power consumption is substantially reduced. The drive current is proportional to the full-scale voltage level and inversely proportional to the output resistor value. The input video signal is only 0.25VP-P, a factor of 4 lower than the normal full-scale video signal. The DAC's output resistor value can be increased from 37.5Ω to 150Ω, also a factor of 4. As a result, the DAC's drive current is reduced by a total factor of 16. Bonus: Because the DAC's output swing down to 0.25VP-P, the video DAC supply voltage can be decreased from 3.3V to 1.8V. Due to the drop in both driver current and supply voltage, the DAC's power consumption is substantially reduced.