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AD7190BRUZ-REEL Arkusz danych(PDF) 10 Page - Analog Devices |
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AD7190BRUZ-REEL Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 40 page AD7190 Rev. 0 | Page 10 of 40 NC = NO CONNECT PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 1 2 3 4 5 6 7 8 9 10 MCLK2 SCLK CS P1/REFIN2(+) P2 P3 MCLK1 P0/REFIN2(–) NC AINCOM 12 11 AIN2 AIN1 20 21 22 23 24 19 18 17 16 15 DOUT/RDY SYNC DVDD AGND DGND AVDD BPDSW REFIN1(–) REFIN1(+) DIN AD7190 TOP VIEW (Not to Scale) 14 13 AIN3 AIN4 Figure 5. Pin Configuration Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 MCLK1 When the master clock for the device is provided externally by a crystal, the crystal is connected between MCLK1 and MCLK2. 2 MCLK2 Master Clock Signal for the Device. The AD7190 has an internal 4.92 MHz clock. This internal clock can be made available on the MCLK2 pin. The clock for the AD7190 can be provided externally also in the form of a crystal or external clock. A crystal can be tied across the MCLK1 and MCLK2 pins. Alternatively, the MCLK2 pin can be driven with a CMOS-compatible clock and the MCLK1 pin left unconnected. 3 SCLK Serial Clock Input. This serial clock input is for data transfers to and from the ADC. The SCLK has a Schmitt- triggered input, making the interface suitable for opto-isolated applications. The serial clock can be continuous with all data transmitted in a continuous train of pulses. Alternatively, it can be a noncon- tinuous clock with the information transmitted to or from the ADC in smaller batches of data. 4 CS Chip Select Input. This is an active low logic input used to select the ADC. CS can be used to select the ADC in systems with more than one device on the serial bus or as a frame synchronization signal in communicating with the device. CS can be hardwired low, allowing the ADC to operate in 3-wire mode with SCLK, DIN, and DOUT used to interface with the device. 5 P3 Digital Output Pin. This pin can function as a general-purpose output bit referenced between AVDD and AGND. 6 P2 Digital Output Pin. This pin can function as a general-purpose output bit referenced between AVDD and AGND. 7 P1/REFIN2(+) Digital Output Pin/Positive Reference Input. This pin functions as a general-purpose output bit referenced between AVDD and AGND. When REFSEL = 1, this pin functions as REFIN2(+). An external reference can be applied between REFIN2(+) and REFIN2(−). REFIN2(+) can lie anywhere between AVDD and GND + 1 V. The nominal reference voltage, (REFIN2(+) − REFIN2(−)), is AVDD, but the part functions with a reference from 1 V to AVDD. 8 P0/REFIN2(−) Digital Output Pin/Negative Reference Input. This pin functions as a general-purpose output bit referenced between AVDD and AGND. When REFSEL = 1, this pin functions as REFIN2(−). This reference input can lie anywhere between GND and AVDD − 1 V. 9 NC No Connect. This pin should be tied to AGND. 10 AINCOM Analog Input AIN1 to Analog Input AIN4 are referenced to this input when configured for pseudo differential operation. 11 AIN1 Analog Input. It can be configured as the positive input of a fully differential input pair when used with AIN2 or as a pseudo differential input when used with AINCOM. 12 AIN2 Analog Input. It can be configured as the negative input of a fully differential input pair when used with AIN1 or as a pseudo differential input when used with AINCOM. |
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Podobny opis - AD7190BRUZ-REEL |
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