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AD7731BR-REEL Datasheet(PDF) 7 Page - Analog Devices |
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AD7731BR-REEL Datasheet(HTML) 7 Page - Analog Devices |
7 / 44 page AD7731 –7– REV. 0 FASTSTEP™ FILTER CHOP ANALOG INPUT DIGITAL OUTPUT BUFFER SKIP OUTPUT SCALING 22-TAP FIR FILTER THE ANALOG INPUT TO THE PART CAN BE CHOPPED. IN CHOPPING MODE, THE INPUT IS CHOPPEDAND THE OUTPUT OF THE FIRST STAGE FILTER IS CHOPPED REMOVING ERRORS IN THAT PATH. THE DEFAULT CONDITION IS CHOPPING DISABLED THE FIRST STAGE OF THE DIGITAL FILTERING ON THE PART IS THE SINC3 FILTER. THE OUTPUT UPDATE RATE AND BANDWIDTH OF THIS FILTER CAN BE PROGRAMMED. IN SKIP MODE, THE SINC3 FILTER IS THE ONLY FILTERING PERFORMED ON THE P3T. IN SKIP MODE, THERE IS NO SECOND STAGE OF FILTERING ON THE PART. THE SINC3 FILTER IS THE ONLY FILTERING PERFORMED ON THE PART. THIS IS THE SECOND STAGE FILTER WITH SKIP DISABLED, THE NORMAL OPERATING MODE OF THE SECOND STAGE OF THE DIGITAL FILTERING ON THE PART IS A FIXED 22-TAP FIR FILTER. IN SKIP MODE, THIS FIR FILTER IS BYPASSED. WHEN FASTSTEP™ MODE IS ENABLED AND A STEP INPUT IS DETECTED, THE SECOND STAGE FILTERING IS PERFORMED BY THE FAST STEP FILTER UNTIL THE OUTPUT OF THIS FILTER HAS FULLY SETTLED THE OUTPUT WORD FROM THE DIGITAL FILTER IS SCALED BY THE CALIBRATION COEFFICIENTS BEFORE BEING PROVIDED AS THE CONVERSION RESULT WHEN FASTSTEP™ MODE IS ENABLED AND A STEP CHANGE ON THE INPUT HAS BEEN DETECTED, THE SECOND STAGE FILTERING IS PERFORMED BY THE FASTSTEP™ FILTER UNTIL THE FIR FILTER HAS FULLY SETTLED. THE OUTPUT OF THE FIRST STAGE OF FILTERING ON THE PART CAN BE CHOPPED. THE DEFAULT CONDITION IS CHOPPING DISABLED THE PROGRAMMABLE GAIN CAPABILITY OF THE PART IS INCORPORATED AROUND THE SIGMA DELTA MODULATOR.THE MODULATOR PROVIDES A HIGH- FREQUENCY 1-BIT DATA STREAM TO THE DIGITAL FILTER. THE INPUT SIGNAL IS BUFFERED ON-CHIP BEFORE BEING APPLIED TO THE SAMPLING CAPACITOR OF THE SIGMA DELTA MODULATOR. THIS ISOLATES THE SAMPLING CAPACITOR CHARGING CURRENTS FROM THE ANALOG INPUT PINS PGA & SIGMA-DELTA MODULATOR SINC3 FILTER CHOP INPUT CHOPPING SINC3 FILTER SKIP MODE 22-TAP FIR FILTER OUTPUT SCALING FASTSTEP™ FILTER YY OUTPUT CHOPPING PGA & SIGMA-DELTA MODULATOR BUFFER SEE PAGE 25 SEE PAGE 25 SEE PAGE 25 SEE PAGE 26 SEE PAGE 29 SEE PAGE 28 SEE PAGE 25 SEE PAGE 24 SEE PAGE 23 Figure 3. Signal Processing Chain PIN CONFIGURATION SCLK MCLK IN DGND DVDD SYNC NC RDY CS MCLK OUT POL DIN DOUT AGND AVDD AIN5 AIN1 STANDBY 14 1 2 24 23 5 6 7 20 19 18 3 4 22 21 817 916 10 15 11 TOP VIEW (Not to Scale) 12 13 AD7731 RESET REF IN(–) REF IN(+) AIN2 AIN3/D1 AIN4/D0 AIN6 NC = NO CONNECT PIN FUNCTION DESCRIPTIONS Pin Pin No. Mnemonic Function 1 SCLK Serial Clock. Schmitt-Triggered Logic Input. An external serial clock is applied to this input to transfer serial data to or from the AD7731. This serial clock can be a continuous clock with all data transmitted in a continuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being trans- mitted to or from the AD7731 in smaller batches of data. 2 MCLK IN Master Clock signal for the device. This can be provided in the form of a crystal/resonator or external clock. A crystal/resonator can be tied across the MCLK IN and MCLK OUT pins. Alternatively, the MCLK IN pin can be driven with a CMOS-compatible clock and MCLK OUT left unconnected. The part is specified with a clock input frequency of 4.9152 MHz. REV. A |
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Descripción similar - AD7731BR-REEL |
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