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AD7676 Datenblatt(PDF) 10 Page - Analog Devices |
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AD7676 Datenblatt(HTML) 10 Page - Analog Devices |
10 / 32 page AD7612 Rev. 0 | Page 10 of 32 Pin No. Mnemonic Type1 Description 24 D11 or DO In parallel mode, this output is used as Bit 11 of the parallel port data output bus. RDERROR Serial Data Read Error. In serial slave mode (SER/PAR = high, EXT/INT = high), this output is used as an incomplete data read error flag. If a data read is started and not completed when the current conversion is complete, the current data is lost and RDERROR is pulsed high. 25 D12 or DI/O In parallel mode, this output is used as Bit 12 of the parallel port data output bus. HW/SW Serial Configuration Hardware/Software Select. In serial mode, this input is used to configure the AD7612 by hardware or software. See the Hardware Configuration section and Software Configuration section. When HW/SW = low, the AD7612 is configured through software using the serial configuration register. When HW/SW = high, the AD7612 is configured through dedicated hardware input pins. 26 D13 or DI/O In parallel mode, this output is used as Bit 13 of the parallel port data output bus. SCIN Serial Configuration Data Input. In serial software configuration mode (SER/PAR = high, HW/SW = low) this input is used to serially write in, MSB first, the configuration data into the serial configuration register. The data on this input is latched with SCCLK. See the Software Configuration section. 27 D14 or DI/O In parallel mode, this output is used as Bit 14 of the parallel port data output bus. SCCLK Serial Configuration Clock. In serial software configuration mode (SER/PAR = high, HW/SW = low) this input is used to clock in the data on SCIN. The active edge where the data SCIN is updated depends on the logic state of the INVSCLK pin. See the Software Configuration section. 28 D15 or DI/O In parallel mode, this output is used as Bit 15 of the parallel port data output bus. SCCS Serial Configuration Chip Select. In serial software configuration mode (SER/PAR = high, HW/SW = low) this input enables the serial configuration port. See the Software Configuration section. 29 BUSY DO Busy Output. Transitions high when a conversion is started, and remains high until the conversion is complete and the data is latched into the on-chip shift register. The falling edge of BUSY can be used as a data ready clock signal. Note that in master read after convert mode (SER/PAR = high, EXT/INT = low, RDC = low) the busy time changes according to Table 4. 30 TEN DI2 Input Range Select. Used in conjunction with BIPOLAR per the following: Input Range BIPOLAR TEN 0 V to 5 V Low Low 0 V to 10 V Low High ±5 V High Low ±10 V High High 31 RD DI Read Data. When CS and RD are both low, the interface parallel or serial output bus is enabled. 32 CS DI Chip Select. When CS and RD are both low, the interface parallel or serial output bus is enabled. CS is also used to gate the external clock in slave serial mode (not used for serial programmable port). 33 RESET DI Reset Input. When high, reset the AD7612. Current conversion, if any, is aborted. The falling edge of RESET resets the data outputs to all zero’s (with OB/2C = high) and clears the configuration register. See the Digital Interface section. If not used, this pin can be tied to OGND. 34 PD DI2 Power-Down Input. When PD = high, power down the ADC. Power consumption is reduced and conversions are inhibited after the current one is completed. The digital interface remains active during power down. 35 CNVST DI Conversion Start. A falling edge on CNVST puts the internal sample-and-hold into the hold state and initiates a conversion. 36 BIPOLAR DI2 Input Range Select. See description for Pin 30. 37 REF AI/O Reference Input/Output. When PDREF/PDBUF = low, the internal reference and buffer are enabled, producing 5 V on this pin. When PDREF/PDBUF = high, the internal reference and buffer are disabled, allowing an externally supplied voltage reference up to AVDD volts. Decoupling with at least a 22 μF is required with or without the internal reference and buffer. See the Reference Decoupling section. 38 REFGND AI Reference Input Analog Ground. Connected to analog ground plane. 39 IN− AI Analog Input Ground Sense. Should be connected to the analog ground plane or to a remote sense ground. 40 VCC P High Voltage Positive Supply. Normally +7 V to +15 V. 41 VEE P High Voltage Negative Supply. Normally 0 V to −15 V (0 V in unipolar ranges). |
Ähnliche Teilenummer - AD7676 |
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Ähnliche Beschreibung - AD7676 |
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