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AD7723 Datasheet(PDF) 1 Page - Analog Devices |
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AD7723 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 23 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 AD7723 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 16-Bit, 1.2 MSPS CMOS, Sigma-Delta ADC FUNCTIONAL BLOCK DIAGRAM AGND AVDD DGND VIN(+) VIN(–) REF2 XTAL CLKIN MODE 1 STBY SYNC CFMT/ RD DGND/ DRDY DGND/ DB1 DOE/ DB4 SFMT/ DB5 FSI/ DB6 SCO/ DB7 MODULATOR FIR FILTER XTAL CLOCK AD7723 DGND/ DB2 DGND/ DB3 SDO/ DB8 DGND/DB0 CONTROL LOGIC DVDD /CS MODE 2 HALF_PWR UNI DGND/DB14 DGND/DB15 SCR/DB13 SLDR/DB12 SLP/DB11 TSI/DB10 FSO/DB9 XTAL_OFF 2.5V REFERENCE REF1 DVDD FEATURES 16-Bit Sigma-Delta ADC 1.2 MSPS Output Word Rate 32/16 Oversampling Ratio Low-Pass and Band-Pass Digital Filter Linear Phase On-Chip 2.5 V Voltage Reference Standby Mode Flexible Parallel or Serial Interface Crystal Oscillator Single +5 V Supply GENERAL DESCRIPTION The AD7723 is a complete 16-bit, sigma-delta ADC. The part operates from a +5 V supply. The analog input is continuously sampled, eliminating the need for an external sample-and-hold. The modulator output is processed by a finite impulse response (FIR) digital filter. The on-chip filtering combined with a high oversampling ratio reduces the external antialias requirements to first order in most cases. The digital filter frequency response can be programmed to be either low pass or band pass. The AD7723 provides 16-bit performance for input bandwidths up to 460 kHz at an output word rate up to 1.2 MHz. The sample rate, filter corner frequencies and output word rate are set by the crystal oscillator or external clock frequency. Data can be read from the device in either serial or parallel format. A stereo mode allows data from two devices to share a single serial data line. All interface modes offer easy, high speed connections to modern digital signal processors. The part provides an on-chip 2.5 V reference. Alternatively, an external reference can be used. A power-down mode reduces the idle power consumption to 200 µW. The AD7723 is available in a 44-lead PQFP package and is specified over the industrial temperature range from –40 °C to +85 °C. Two input modes are provided, allowing both unipolar and bipolar input ranges. |
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