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Successive Approximation Register ADC

Fri, 09/28/2001 - 9:40am
The AD7484 is a 14-bit SAR (successive approximation register) ADC. It offers a parallel interface with throughput rates up to 3 MSPS. A 12-bit version — the AD7482 — is also available. Interfacing is via standard control lines making the converters directly compatible with microcontrollers and DSPs. These ADCs contain a low-noise, wide-bandwidth track/hold amplifier that can handle input frequencies in excess of 50 MHz.

Factory trimming ensures high DC accuracy resulting in very low INL, offset, and gain errors. The converters use advanced circuit design techniques to achieve very low power dissipation (80 mW)at a high throughput rate of 3 MSPS. There are two power saving modes. NAP mode keeps reference circuitry active for quick power up and consumes 5 mW. STANDBY mode reduces power consumption to 5 μW. The AD7484 features an on-board +2.5 V reference and accommodates and external +2.5 V reference source. Also provided is an 8% over-range capability via a fifteenth bit. If the analog input range strays outside the nominal voltage, or drops to as low as 200 mV below ground, the designer can still accurately resolve the signal.

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