16-BIT SAR converter

Analog Devices has introduced a 16-bit successive-approximation register analog-to-digital converter.

Analog Devices has introduced a 16-bit successive-approximation register (SAR) analog-to-digital converter (ADC).

The AD7686 is a 16-bit, 550 kSPS, charge redistribution SAR ADC that operates from a single power supply. It contains a high-speed, 16-bit sampling ADC, an internal conversion clock, error correction circuits, and a flexible serial interface port. The part also includes a low-noise, wide-bandwidth, very short aperture delay track/hold circuit, which can sample an analog input range from 0 V to VREF. The reference voltage is applied externally and may equal the supply voltage.

The AD7686 has no data latency, and operates at three different speeds, including a very high sampling rate ‘warp’ mode of 550 kSPS for asynchronous conversion rate applications, a 450 kSPS ‘normal’ mode for low power applications, and an ‘impulse’ mode in which the power consumption varies with the throughput. Also, the serial interface features the possibility to ‘daisy chain’ several ADCs on a single three-wire bus and provide an optional busy indicator.

The AD7686 is housed in 10-lead MSOP with operation specified from -40 degrees C to +85 degrees C. It dissipates 20 mW with a 2.7 V supply. The device is priced at $12.00 per unit in 1,000-piece quantities.

Sampling now, the part will be in full production in December 2003.

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