Linear Technology introduced the LT1398 and LT1399, dual and triple current feed-back op amps with 300MHz bandwidth at gain of two and 0.1dB gain flatness up to 150MHz. They maintain excellent linearity while driving cables and other low impedance loads and can drive large capacitive loads. These characteristics make the LT1398 and LT1399 ideal for driving LCD displays and other RGB applications, and in VGA or higher resolution video graphics.

The addition of a small series resistor enables the LT1398 and LT1399 to drive very large capacitive loads typical of LCD panels. For a 300pF load and a 6V output step, the LT1398 and LT1399 settle to 0.1% in just 35ns. They provide sharp images with their 800V/ýs slew rate and 1.3ns rise and fall time. Each amplifier within these parts has an individual shutdown pin for easy multiplexing and signal routing.

Driving larger LCD displays has become a major challenge while still achieving bandwidth. In this part I am impressed with its drive capabilities -- high capacitance loads and the 80-mA output current per channel -- and I am extremely impressed with the 0.1-dB flatness to 150 MHz. The supply range will allow its incorporation in virtually any design while the complete shut-off current of zero obviously cannot be improved on. The slew rate is not the highest around but the maximal flatness is, I believe, more important in the video/graphics designs the parts are intended for. The 4.5 mA power consumption is good for the drive levels possible.