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AD7679ACPRL Datasheet(PDF) 10 Page - Analog Devices |
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AD7679ACPRL Datasheet(HTML) 10 Page - Analog Devices |
10 / 28 page AD7679 Pin No. Mnemonic Type1 Description 35 CNVST DI Start Conversion. If CNVST is held HIGH when the acquisition phase (t8) is complete, the next falling edge on CNVST puts the internal sample/hold into the hold state and initiates a conversion. If CNVST is held LOW when the acquisition phase is complete, the internal sample/hold is put into the hold state and a conversion is started immediately. 36 AGND P Must Be Tied to Analog Ground. 37 REF AI Reference Input Voltage and Internal Reference Buffer Output. Apply an external reference on this pin if the internal reference buffer is not used. Should be decoupled effectively with or without the internal buffer. 38 REFGND AI Reference Input Analog Ground. 39 IN– AI Differential Negative Analog Input. 43 IN+ AI Differential Positive Analog Input. 46 REFBUFIN AI Reference Buffer Input Voltage. The internal reference buffer has a fixed gain. It outputs 4.096 V typically when 2.5 V is applied on this pin. 48 PDBUF DI Allows Choice of Buffering Reference. When LOW, buffer is selected. When HIGH, buffer is switched off. 1AI = Analog Input; AO = Analog Output; DI = Digital Input; DI/O = Bidirectional Digital; DO = Digital Output; P = Power. Table 7. Data Bus Interface Definitions MODE MODE1 MODE0 D0/OB/2C D1/A0 D2/A1 D[3] D[4:9] D[10:11] D[12:15] D[16:17] Description 0 0 0 R[0] R[1] R[2] R[3] R[4:9] R[10:11] R[12:15] R[16:17] 18-Bit Parallel 1 0 1 OB/2C A0:0 R[2] R[3] R[4:9] R[10:11] R[12:15] R[16:17] 16-Bit High Word 1 0 1 OB/2C A0:1 R[0] R[1] All Zeros 16-Bit Low Word 2 1 0 OB/2C A0:0 A1:0 All Hi-Z R[10:11] R[12:15] R[16:17] 8-Bit HIGH Byte 2 1 0 OB/2C A0:0 A1:1 All Hi-Z R[2:3] R[4:7] R[8:9] 8-Bit MID Byte 2 1 0 OB/2C A0:1 A1:0 All Hi-Z R[0:1] All Zeros 8-Bit LOW Byte 2 1 0 OB/2C A0:1 A1:1 All Hi-Z All Zeros R[0:1] 8-Bit LOW Byte 3 1 1 OB/2C All Hi-Z Serial Interface Serial Interface R[0:17] is the 18-bit ADC value stored in its output register. Rev. 0 | Page 10 of 28 |
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