ADC boasts speed,
accuracy and low power
Analog Devices claims its latest ADC is twice as fast, twice as precise and four times more power efficient than competitive parts
The AD7677 PulSAR 1Msample/s successive-approximation (SAR) ADC is accurate to 1LSB integral nonlinearity (INL), delivering industry-leading speed and precision to a variety of applications. ADI reached this new level of precision only months after the announcement of the AD7671, the first 1Msample/s 16bit SAR convertor.
SAR convertors, which comprise the majority of the ADC market, are widely considered the most cost-effective technology for applications that require very precise digital modelling of higher frequency analogue signals.
The AD7677 is a fully differential ADC that offers16bit resolution with no missing codes.
The AD7677 has no pipeline delay and operates at three different speeds, including 1Msample/s 'warp' mode for asynchronous sampling applications, 800Ksample/s 'normal' mode, and an 'impulse' mode, in which power consumption varies with throughput rate.
Signal to noise and distortion (SINAD) for the AD7677 is typically 94dB, with a minimum of 92 dB.
The device operates from a single 5V power supply and dissipates only 115mW (typical).
It consumes only 7uW when in power-down mode.
The AD7677 is designed to interface easily with the rest of the circuit.
Bipolar/unipolar inputs accommodate variable input ranges.
An internal conversion clock, error correction circuits, and both serial and parallel system interface ports are integrated on-chip.
With its compact, 9 x 9 mm 48-lead LQFP, the AD7677 saves board space, is pin compatible with the AD7664, AD7675 and AD7676 PulSAR family of 16bit SAR convertors, and is specified to operate from -40 to +85C.
The AD7677 is priced at $39.76 in 1000-piece quantities.
Evaluation boards and production quantities are now available.
(This was Electronicstalk's Top Story on 25 January 2002)
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