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AD7485 14-Bit, 1 MSPS SAR ADC

The AD7485 is a 14-bit, high speed, low power, successive-approximation ADC. The part features a serial interface with throughput rates up to 1 MSPS. The part contains a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 10MHz.

The conversion process is a proprietary algorithmic successive-approximation technique. The input signal is sampled and conversion is initiated on the falling edge of a CONVST signal. The conversion process is controlled by an external master clock. Interfacing is via standard serial signal lines making the part directly compatible with microcontrollers and DSPs.

The AD7485 provides excellent ac and dc performance specifications. Factory trimming ensures high dc accuracy resulting in very low INL, offset and gain errors.

The part uses advanced design techniques to achieve very low power dissipation at high throughput rates. Power consumption in normal mode of operation is 70 mW. There are two power-saving modes: a NAP mode, which keeps reference circuitry alive for quick power up, consumes 5 mW while a STANDBY mode reduces power consumption to a mere 5 µW.

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• Technical Articles：MS-2210: Designing Power Supplies for High Speed ADC