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AD7716BS Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7716BS Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page AD7716 a LC 2MOS 22-Bit Data Acquisition System There are 22 bits of data corresponding to the analog input. Two bits contain the channel address and 3 bits are the device address. Thus, each channel in a 32-channel system would have a discrete 5-bit address. The device also has a CASCOUT pin and a CASCIN pin that allow simple networking of multiple devices. The on-chip control register is programmed using the SCLK, SDATA and TFS pins. Three bits of the Control Register set the digital filter cutoff frequency for the device. Selectable fre- quencies are 584 Hz, 292 Hz, 146 Hz, 73 Hz and 36.5 Hz. A further 2 bits appear as outputs DOUT1 and DOUT2 and can be used for controlling calibration at the front end. The device is available in a 44-pin PQFP (Plastic Quad Flatpack) and 44-pin PLCC. GENERAL DESCRIPTION The AD7716 is a signal processing block for data acquisition systems. It is capable of processing four channels with band- widths of up to 584 Hz. Resolution is 22 bits and the usable dynamic range varies from 111 dB with an input bandwidth of 36.5 Hz to 99 dB with an input bandwidth of 584 Hz. The device consists of four separate A/D converter channels that are implemented using sigma-delta technology. Sigma-delta ADCs include on-chip digital filtering and, thus, the system filtering requirements are eased. Three address pins program the device address. This allows a data acquisition system with up to 32 channels to be set up in a simple fashion. The output word from the device contains 32 bits of data. One bit is determined by the state of the DIN1 in- put and may be used, for example, in an ECG system with an external pacemaker detect circuit to indicate that the output word is invalid because of the presence of a pacemaker pulse. FUNCTIONAL BLOCK DIAGRAM CONTROL LOGIC OUTPUT SHIFT REGISTER CONTROL REGISTER CLOCK GENERATION ANALOG MODULATOR LOW PASS DIGITAL FILTER CLKOUT CLKIN V REF AGND DGND D IN 1 D OUT 1 D OUT 2 MODE CASCIN CASCOUT SDATA SCLK TFS RFS DRDY A IN 1 A IN 2 A IN 3 A IN 4 AV DD DV DD AV SS A0 A1 A2 RESET ANALOG MODULATOR LOW PASS DIGITAL FILTER ANALOG MODULATOR LOW PASS DIGITAL FILTER ANALOG MODULATOR LOW PASS DIGITAL FILTER AD7716 FEATURES 22-Bit Sigma-Delta ADC Dynamic Range of 105 dB (146 Hz Input) 0.003% Integral Nonlinearity On-Chip Low-Pass Digital Filter Cutoff Programmable from 584 Hz to 36.5 Hz Linear Phase Response Five Line Serial I/O Twos Complement Coding Easy Interface to DSPs and Microcomputers Software Control of Filter Cutoff 5 V Supply Low Power Operation: 50 mW APPLICATIONS Biomedical Data Acquisition ECG Machines EEG Machines Process Control High Accuracy Instrumentation Seismic Systems One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 REV. A 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. |
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