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AD7731BRU-REEL7 Fiches technique(PDF) 6 Page - Analog Devices |
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AD7731BRU-REEL7 Fiches technique(HTML) 6 Page - Analog Devices |
6 / 44 page AD7731 –6– REV. 0 SIGMA- DELTA MODULATOR AD7731 SERIAL INTERFACE AND CONTROL LOGIC REGISTER BANK CLOCK GENERATION PROGRAMMABLE DIGITAL FILTER SIGMA-DELTA A/D CONVERTER BUFFER PGA AGND AVDD AIN1 AIN2 AIN3/D1 AIN4/D0 STANDBY SYNC MCLK IN MCLK OUT SCLK CS DIN DOUT RESET RDY POL DGND AGND AVDD DVDD REF IN(–) REF IN(+) MUX AIN5 AIN6 CALIBRATION MICROCONTROLLER REGISTER BANK TWELVE REGISTERS CONTROL ALL FUNCTIONS ON THE PART AND PROVIDE STATUS INFORMATION AND CONVERSION RESULTS SEE PAGE 20 CALIBRATION MICROCONTROLLER THE AD7731 OFFERS A NUMBER OF DIFFERENT CALIBRATION OPTIONS INCLUDING SELF AND SYSTEM CALIBRATION SEE PAGE 28 *SPI IS A TRADEMARK OF MOTOROLA, INC. BUFFER AMPLIFIER THE BUFFER AMPLIFIER PRESENTS A HIGH IMPEDANCE INPUT STAGE FOR THE ANALOG INPUTS ALLOWING SIGNIFICANT EXTERNAL SOURCE IMPEDANCES SEE PAGE 23 BURNOUT CURRENTS TWO 100nA BURNOUT CURRENTS ALLOW THE USER TO EASILY DETECT IF A TRANSDUCER HAS BURNT OUT OR GONE OPEN-CIRCUIT SEE PAGE 23 PROGRAMMABLE GAIN AMPLIFIER THE PROGRAMMABLE GAIN AMPLIFIER ALLOWS SEVEN UNIPOLAR AND SEVEN BIPOLAR INPUT RANGES FROM +20mV TO +1.28V SEE PAGE 23 DIFFERENTIAL REFERENCE THE REFERENCE INPUT TO THE PART IS DIFFERENTIAL AND FACILITATES RATIOMETRIC OPERATION. THE REFERENCE VOLTAGE CAN BE SELECTED TO BE NOMINALLY +2.5V OR +5V. REFERENCE DETECT CIRCUITRY TESTS FOR OPEN OR SHORTED REFERENCES SEE PAGE 24 SIGMA-DELTA ADC THE SIGMA-DELTA ARCHITECTURE ENSURES 24 BITS NO MISSING CODES. THE ENTIRE SIGMA-DELTA ADC CAN BE CHOPPED TO REMOVE DRIFT ERRORS SEE PAGE 24 PROGRAMMABLE DIGITAL FILTER TWO STAGE FILTER THAT ALLOWS PROGRAMMING OF OUTPUT UPDATE RATE AND SETTLING TIME AND THAT HAS A FASTSTEPTM MODE (SEE FIGURE 3) SEE PAGE 24 STANDBY MODE THE STANDBY MODE REDUCES POWER CONSUMPTION TO 50 W SEE PAGE 32 CLOCK OSCILLATOR CIRCUIT THE CLOCK SOURCE FOR THE PART CAN BE PROVIDED BY AN EXTERNALLY-APPLIED CLOCK OR BY CONNECTING A CRYSTAL OR CERAMIC RESONATOR ACROSS THE CLOCK PINS SEE PAGE 31 SERIAL INTERFACE SPI*-COMPATIBLE OR DSP- COMPATIBLE SERIAL INTERFACE THAT CAN BE OPERATED FROM JUST THREE WIRES. ALL FUNCTIONS ON THE PART (APART FROM MASTER RESET) CAN BE ACCESSED VIA THE SERIAL INTERFACE SEE PAGE 33 OUTPUT DRIVERS THE AIN3 AND AIN4 INPUT CHANNELS CAN BE RECONFIGURED TO BECOME TWO OUTPUT DIGITAL PORT LINES THAT CAN BE PROGRAMMED OVER THE SERIAL INTERFACE SEE PAGE 32 ANALOG MULTIPLEXER A DIFFERENTIAL MULTIPLEXER ALLOWS SELECTION OF THREE FULLY DIFFERENTIAL PAIRS OR FIVE PSEUDO-DIFFERENTIAL INPUT PAIRS TO BE SWITCHED TO THE BUFFER AMPLIFIER. THE MULTIPLEXER IS CONTROLLED VIA THE SERIAL INTERFACE SEE PAGE 23 Figure 2. Detailed Functional Block Diagram REV. A |
Numéro de pièce similaire - AD7731BRU-REEL7 |
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Description similaire - AD7731BRU-REEL7 |
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