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AD1672 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD1672 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Complete 12-Bit, 3 MSPS Monolithic A/D Converter AD1672 © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES Single Supply Pin Configurable Input Voltage Ranges Power Dissipation: 240 mW No Missing Codes Guaranteed Differential Nonlinearity Error: 0.5 LSB Complete: On-Chip Sample-and-Hold Amplifier and Voltage Reference Signal-to-Noise and Distortion Ratio: 68 dB Spurious-Free Dynamic Range: –77 dB Out of Range Indicator Binary Output Data Digital I/Os Compatible with +5 V or +3.3 V Logic 28-Pin PLCC Package input combined with the power and cost savings over previously available solutions will enable new designs in communications, imaging and medical applications. The AD1672 provides both reference output and reference input pins allowing the onboard reference to serve as a system reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application. The digital output data is pre- sented in a straight binary output format for the unipolar input ranges of 0 V to 2.5 V and 0 V to 5.0 V. For the bipolar input range of –2.5 V to +2.5 V, the digital output data is presented in an offset binary format. An out-of-range (OTR) signal indicates an overflow condition. It can be used with the most significant bit to determine low or high overflow. The AD1672 is packaged in a 28-pin PLCC package and is specified for operation from –40 °C to +85°C. PRODUCT HIGHLIGHT The AD1672 offers a complete single-chip sampling 12-bit, 3 MSPS analog-to-digital conversion function in a 28-pin PLCC package. The AD1672 at 240 mW consumes a fraction of the power of presently available solutions and provides exceptional perfor- mance relative to other monolithic solutions. OUT OF RANGE (OTR)—The OTR output bit indicates when the input signal is beyond the AD1672’s input range. Ease-of-Use—The single supply AD1672 is complete with SHA voltage reference and pin strappable input ranges. It is compat- ible with a wide range of amplifiers. PRODUCT DESCRIPTION The AD1672 is a monolithic, single supply 12-bit, 3 MSPS analog-to-digital converter with an on-chip, high performance sample-and-hold amplifier (SHA) and voltage reference. The AD1672 uses a multistage pipelined architecture with output error correction logic to provide 12-bit accuracy at 3 MSPS data rates and guarantees no missing codes over the full operating temperature range. The AD1672 combines a high performance BiCMOS process and a novel architecture to achieve its high performance levels. The fast settling input SHA is equally suited for both multi- plexed systems that switch negative to positive full-scale voltage levels in successive channels and sampling single-channel inputs at frequencies up to the Nyquist rate. The AD1672’s wideband FUNCTIONAL BLOCK DIAGRAM THA THA DAC AMP REF AMP 4 4 3 4 CORRECTION LOGIC 2.5V REF OUTPUT REFCOM OUTPUT DATA 12 BITS CLOCK INPUT ADC DAC ADC BANDGAP REFERENCE LATCHES CLOCK TIMER NOISE REDUCTION AIN1 & 2 REF IN AD1672 THA THA REFCOM ADC DAC ADC DAC |
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