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AD7730BRUZ-REEL7 Fiches technique(PDF) 7 Page - Analog Devices |
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AD7730BRUZ-REEL7 Fiches technique(HTML) 7 Page - Analog Devices |
7 / 53 page AD7730/AD7730L –7– Figure 3. Signal Processing Chain PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS 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 AD7730. This serial clock can be a continuous clock with all data transmitted in a con- tinuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being transmitted to or from the AD7730 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 AD7730 is specified with a clock input frequency of 4.9152 MHz while the AD7730L is specified with a clock input frequency of 2.4576 MHz. SCLK MCLK IN DGND DVDD SYNC VBIAS RDY CS MCLK OUT POL DIN DOUT AGND AVDD ACX AIN1(+) STANDBY 14 1 2 24 23 5 6 7 20 19 18 3 4 22 21 8 17 9 16 10 15 11 TOP VIEW (Not to Scale) 12 13 AD7730 RESET REF IN(–) REF IN(+) AIN1(–) AIN2(+)/D1 AIN2(–)/D0 ACX PGA + SIGMA-DELTA MODULATOR SINC3 FILTER CHOP 22-TAP FIR FILTER FASTSTEP FILTER CHOP INPUT CHOPPING THE ANALOG INPUT TO THE PART CAN BE CHOPPED. IN CHOPPING MODE, WITH AC EXCITATION DISABLED, THE INPUT CHOPPING IS INTERNALTO THE DEVICE. IN CHOPPING MODE, WITH AC EXCITATION ENABLED, THE CHOPPING IS ASSUMED TO BE PERFORMED EXTERNAL TO THE PART AND NO INTERNAL INPUT CHOPPING IS PERFORMED. THE INPUT CHOPPING CAN BE DISABLED, IF DESIRED. SEE PAGE 26 ANALOG INPUT DIGITAL OUTPUT SINC3 FILTER 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 PART. SEE PAGE 26 BUFFER SKIP MODE IN SKIP MODE, THERE IS NO SECOND STAGE OF FILTERING ON THE PART. THE SINC3 FILTER IS THE ONLY FILTERING PERFORMED ON THE PART. SEE PAGE 29 SKIP OUTPUT SCALING 22-TAP FIR FILTER IN NORMAL OPERATING MODE, 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 FILTER UNTIL THE OUTPUT OF THIS FILTER HAS FULLY SETTLED. SEE PAGE 27 OUTPUT SCALING THE OUTPUT WORD FROM THE DIGITAL FILTER IS SCALED BY THE CALIBRATION COEFFICIENTS BEFORE BEING PROVIDED AS THE CONVERSION RESULT. SEE PAGE 29 FASTSTEP FILTER 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. SEE PAGE 29 OUTPUT CHOPPING THE OUTPUT OF THE FIRST STAGE OF FILTERING ON THE PART CAN BE CHOPPED. IN CHOPPING MODE, REGARDLESS OF WHETHER AC EXCITATION IS ENABLED OR DISABLED, THE OUTPUT CHOPPING IS PERFORMED. THE CHOPPING CAN BE DISABLED, IF DESIRED. SEE PAGE 26 PGA + SIGMA-DELTA MODULATOR 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. SEE PAGE 26 BUFFER 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. SEE PAGE 24 REV. B |
Numéro de pièce similaire - AD7730BRUZ-REEL7 |
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Description similaire - AD7730BRUZ-REEL7 |
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