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3.3-V video amps

See this new product at electronica 2008, stand A4.207

Intersil has introduced 200 MHz single supply video drivers, the ISL59833 and ISL59837, equipped with charge pumps that create negative voltage of -1.6V and remove the need for external negative rails. They offer true-single-supply operation of video amplifiers using a single +3.3V power supply. Both drivers handle video signals with black level at ground and the sync pulse below ground, enabling significant reductions in board space and total component cost. The video drivers provide 200 MHz -3dB bandwidth and 50 MHz 0.1dB bandwidth and have an output buffer with a fixed gain of 2. Both devices have an enable pin to power down the op amps, reducing the current to 60 mA. The ISL59837 also has a power-down feature for the charge-pump, further reducing the current to less than 1 mA. DC-accurate output coupling eliminates the need for large output AC coupling capacitors. Generating the negative voltage internally allows for DC-accurate coupling of video onto a 75-Ω double-terminated line. The buffers have an integrated 6 dB of compensation, so there is no need for external gain-setting resistors. An external reference voltage can be applied to the REF pin to shift the analogue video level down, which enables designers to adjust DC levels of the signal or remove a DAC. They occupy a 16-lead QSOP package.