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AD7730 Datasheet(PDF) 6 Page - Analog Devices |
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AD7730 Datasheet(HTML) 6 Page - Analog Devices |
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6 / 53 page  AD7730/AD7730L –6– Figure 2. Detailed Functional Block Diagram SIGMA- DELTA MODULATOR AD7730 6-BIT DAC SERIAL INTERFACE AND CONTROL LOGIC REGISTER BANK CLOCK GENERATION PROGRAMMABLE DIGITAL FILTER SIGMA-DELTA A/D CONVERTER BUFFER PGA AGND AVDD VBIAS AIN1(+) AIN1(–) AIN2(+)/D1 AIN2(–)/D0 ACX ACX STANDBY SYNC MCLK IN MCLK OUT SCLK CS DIN DOUT RESET RDY POL DGND AGND AVDD DVDD REF IN(–) REF IN(+) MUX REFERENCE DETECT AC EXCITATION CLOCK CALIBRATION MICROCONTROLLER + REGISTER BANK THIRTEEN REGISTERS CONTROL ALL FUNCTIONS ON THE PART AND PROVIDE STATUS INFORMATION AND CONVERSION RESULTS SEE PAGE 11 STANDBY MODE THE STANDBY MODE REDUCES POWER CONSUMPTION TO 5 A SEE PAGE 33 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 32 SERIAL INTERFACE SPI*-COMPATIBLE OR DSP- COMPATIBLE SERIAL INTERFACE WHICH CAN BE OPERATED FROM JUST THREE WIRES. ALL FUNCTIONS ON THE PART CAN BE ACCESSED VIA THE SERIAL INTERFACE SEE PAGE 35 OFFSET/TARE DAC ALLOWS A PROGRAMMED VOLTAGE TO BE EITHER ADDED OR SUBTRACTED FROM THE ANALOG INPUT SIGNAL BEFORE IT IS APPLIED TO THE PGA SEE PAGE 24 OUTPUT DRIVERS THE SECOND ANALOG INPUT CHANNEL CAN BE RECONFIGURED TO BECOME TWO OUTPUT DIGITAL PORT LINES WHICH CAN BE PROGRAMMED OVER THE SERIAL INTERFACE SEE PAGE 33 AC EXCITATION FOR AC-EXCITED BRIDGE APPLICATIONS, THE ACX OUTPUTS PROVIDE SIGNALS THAT CAN BE USED TO SWITCH THE POLARITY OF THE BRIDGE EXCITATION VOLTAGE SEE PAGE 41 ANALOG MULTIPLEXER A TWO-CHANNEL DIFFERENTIAL MULTIPLEXER SWITCHES ONE OF THE TWO DIFFERENTIAL INPUT CHANNELS TO THE BUFFER AMPLIFIER. THE MULTIPLEXER IS CONTROLLED VIA THE SERIAL INTERFACE 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 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 SEE PAGE 25 PROGRAMMABLE DIGITAL FILTER TWO STAGE FILTER THAT ALLOWS PROGRAMMING OF OUTPUT UPDATE RATE AND SETTLING TIME AND WHICH HAS A FAST STEP MODE (SEE FIGURE 3) SEE PAGE 26 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 26 PROGRAMMABLE GAIN AMPLIFIER THE PROGRAMMABLE GAIN AMPLIFIER ALLOWS FOUR UNIPOLAR AND FOUR BIPOLAR INPUT RANGES FROM +10mV TO +80mV SEE PAGE 24 BUFFER AMPLIFIER THE BUFFER AMPLIFIER PRESENTS A HIGH IMPEDANCE INPUT STAGE FOR THE ANALOG INPUTS ALLOWING SIGNIFICANT EXTERNAL SOURCE IMPEDANCES SEE PAGE 24 BURNOUT CURRENTS TWO 100nA BURNOUT CURRENTS ALLOW THE USER TO EASILY DETECT IF A TRANSDUCER HAS BURNT OUT OR GONE OPEN-CIRCUIT SEE PAGE 25 +/– *SPI IS A TRADEMARK OF MOTOROLA, INC. REV. B |
Número de pieza similar - AD7730_12 |
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Descripción similar - AD7730_12 |
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