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AD7679ACPRL Folha de dados(PDF) 1 Page - Analog Devices |
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AD7679ACPRL Folha de dados(HTML) 1 Page - Analog Devices |
1 / 28 page 18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC AD7679 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved. FEATURES 18-bit resolution with no missing codes No pipeline delay (SAR architecture) Differential input range: ±VREF (VREF up to 5 V) Throughput: 570 kSPS INL: ±2.5 LSB max (±9.5 ppm of full scale) Dynamic range : 103 dB typ (VREF = 5 V) S/(N+D): 100 dB typ @ 2 kHz (VREF = 5 V) Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface SPI ®/QSPI™/MICROWIRE™/DSP compatible On-board reference buffer Single 5 V supply operation Power dissipation: 76 mW @ 500 kSPS 150 µW @ 1 kSPS 48-lead LQFP or 48-lead LFCSP package Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678 APPLICATIONS CT scanners High dynamic data acquisition Geophone and hydrophone sensors Σ-∆ replacement (low power, multichannel) Instrumentation Spectrum analysis Medical instruments GENERAL DESCRIPTION The AD7679 is an 18-bit, 570 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply. The part contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports. The part is available in a 48-lead LQFP or 48-lead LFCSP with operation specified from –40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM SWITCHED CAP DAC 18 CONTROL LOGIC AND CALIBRATION CIRCUITRY CLOCK AD7679 D[17:0] BUSY RD CS MODE0 OGND OVDD DGND DVDD AVDD AGND REF REFGND IN+ IN– PD RESET SERIAL PORT PARALLEL INTERFACE CNVST PDBUF REFBUFIN MODE1 03085–0–001 Figure 1. Functional Block Diagram Table 1. PulSAR Selection Type/kSPS 100–250 500–570 800– 1000 Pseudo- Differential AD7651 AD7660/AD7661 AD7650/AD7652 AD7664/AD7666 AD7653 AD7667 True Bipolar AD7663 AD7665 AD7671 True Differential AD7675 AD7676 AD7677 18-Bit AD7678 AD7679 AD7674 Multichannel/ Simultaneous AD7654 AD7655 PRODUCT HIGHLIGHTS 1. High Resolution, Fast Throughput. The AD7679 is a 570 kSPS, charge redistribution, 18-bit SAR ADC (no latency). 2. Excellent Accuracy. The AD7679 has a maximum integral nonlinearity of 2.5 LSB with no missing 18-bit codes. 3. Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 3-wire serial interface arrangement compatible with both 3 V and 5 V logic. |
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