Differential Drivers

March 8, 2007
The ADA4937-1 and ADA4938-1 differential drivers have distortion levels 10 dB lower than comparable drivers.

The drivers are optimized to drive high-performance analog-to-digital converters from dc to 100 MHz. The improved performance, when used in wireless equipment, translates into higher data rates with fewer errors. When used in data-acquisition systems, data collection is faster and more accurate.

The ADA4937-1 for 3 to 5-V supplies, excels at low distortion, hitting –120/–102 dBc at 10 MHz, –98/–100 dBc at 40 MHz, and –84/–90 dBc at 70 MHz. Comparing figures for the ADA4938-1, for 5 to 10-V supplies, are –112/–108-dBc distortion at 10 MHz, –96/–93 dBc 30 MHz, and –79/–81 dBc at 50 MHz in dual supply applications. An internal common-mode feedback architecture lets the output common-mode voltage be controlled by an externally applied voltage. This architecture bridges the output and input range of the ADC and eliminates the need for an ac coupling.

Analog Devices Inc.,
804 Woburn St.,Wilmington, MA 01887,
(800) 2625643,

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