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Differential amps suit high-speed communications apps

Posted: 23 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Tech? LT6402? LT6411? differential amplifiers? ADC drivers?

Linear Technology Corp. has introduced the LT6402 and LT6411, two new differential amplifiers suitable as high-speed ADC drivers, twisted-pair line drivers and single-ended to differential signal converters.

The company said these new products use a new design topology to integrate precision gain-setting resistors on-chip. In addition to simplifying system design and reducing external component count, these devices optimize distortion power and noise performance, critical for high-speed communications applications. With a -3dB bandwidth of 300MHz, the LT6402 is available in three fixed gain options, 6dB, 12dB and 20dB. Low noise and low distortion make the LT6402 suitable for communications transceiver applications as a differential 12bit to 14bit ADC driver, a general-purpose differential gain block, or in other applications requiring differential drive, the company explained. The LT6402 further minimizes external circuitry and simplifies design by providing an on-chip filter and an output common mode voltage pin (VOCM).

The LT6411 is a dual-selectable gain amplifier that can be configured to drive differential signals. The gain of each amplifier can be independently selected, resulting in differential gains of -1, 1, and 2 (0dB or 6dB). With a -3dB bandwidth of 650MHz and a slew rate of 3300V/?s, the LT6411 achieves very low distortion for input signals up to 70MHz, while consuming only 16mA supply current. During periods of inactivity, the LT6411 can be disabled, dropping current consumption to less than 0.35mA max per amplifier. The LT6411 can be used on split supplies as large as 6.3V or on a single supply as low as 4.5V.

"The new LT6411 and LT6402 provide system designers with the flexibility and performance they need to drive high-speed communications and video signals in a wide range of applications," says Brian Black, product marketing manager for Linear Technology's signal conditioning product group.

The LT6402 and LT6411 are available today, with prices starting from $2.39 each in quantities of 1,000 pieces.

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