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AD1556AS Datenblatt(PDF) 1 Page - Analog Devices |
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AD1556AS Datenblatt(HTML) 1 Page - Analog Devices |
1 / 24 page REV. B 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD1555/AD1556 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 © Analog Devices, Inc., 2002 FUNCTIONAL BLOCK DIAGRAM MUX PGA REF DIVIDER DAC MODE CONTROL LOGIC OVERVOLTAGE DETECTION CLOCK GENERATION LOOP FILTER REFIN REFCAP2 REFCAP1 AGND3 DGND VL –VA +VA AGND2 MODIN PGAOUT AGND1 CLKIN SYNC BW0...BW2 RESET PWRDN GND VL AIN (+) AIN (–) TIN (+) TIN (–) AD1555 CB0...CB4 PGA CONTROL CONFIGURATION REGISTER STATUS REGISTER INPUT MUX MFLG MDATA TDATA CSEL MCLK INPUT SHIFT REGISTER DIN SCLK CS R/ W DOUT DRDY RSEL CLOCK DIVIDER DATA OUTPUT MUX DATA REGISTER AD1556 H/ S ERROR PGA0...PGA4 DIGITAL FILTER 24-Bit - ADC with Low Noise PGA FEATURES AD1555 Fourth Order - Modulator Large Dynamic Range 116 dB Min, 120 dB Typical @ 1 ms 117 dB Typical @ 0.5 ms Low Input Noise: 80 nV rms @ 4 ms with Gain of 34,128 Low Distortion: –111 dB Max, –120 dB Typical Low Intermodulation: 122 dB Sampling Rate at 256 kSPS Very High Jitter Tolerance No External Antialias Filter Required Programmable Gain Front End Input Range: 2.25 V Robust Inputs Gain Settings: 1, 2.5, 8.5, 34, 128 Common-Mode Rejection (DC to 1 kHz) 93 dB Min, 101 dB Typical @ Gain of 1 77 mW Typical Low Power Dissipation Standby Modes AD1556 FIR Digital Filter/Decimator Serial or Parallel Selection of Configuration Output Word Rates: 250 SPS to 16 kSPS 6.2 mW Typ Low Power Dissipation 70 W in Standby Mode Reference Design and Evaluation Board with Software Available APPLICATIONS Seismic Data Acquisition Systems Chromatography Automatic Test Equipment GENERAL DESCRIPTION The AD1555 is a complete sigma-delta modulator, combined with a programmable gain amplifier intended for low frequency, high dynamic range measurement applications. The AD1555 outputs a ones-density bitstream proportional to the analog input. When used in conjunction with the AD1556 digital filter/ decimator, a high performance ADC is realized. The continuous-time analog modulator input architecture avoids the need for an external antialias filter. The programmable gain front end simplifies system design, extends the dynamic range, and reduces the system board area. Low operating power and standby modes makes the AD1555 ideal for remote battery-pow- ered data acquisition systems. The AD1555 is fabricated on Analog Devices’ BiCMOS process that has high performance bipolar devices along with CMOS transistors. The AD1555 and AD1556 are packaged, respectively, in 28-lead PLCC and 44-lead MQFP packages and are specified from –55 °C to +85°C (AD1556 and AD1555 B Grade) and from 0 °C to 85°C (AD1555 A Grade). 0 FREQUENCY – Hz –120 –200 0 50 100 150 200 250 300 –20 –100 –140 –180 –60 –80 –160 –40 350 400 450 500 fIN = 24.4Hz SNR = 116.7dB THD = –120.6dB Figure 1. FFT Plot, Full-Scale AIN Input, Gain of 1 |
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Ähnliche Beschreibung - AD1556AS |
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