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AD7890ARZ-2 Arkusz danych(PDF) 9 Page - Analog Devices |
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AD7890ARZ-2 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 29 page AD7890 Rev. C | Page 8 of 28 Pin No. Mnemonic Description 14 SHA IN Track/Hold Input. The input to the on-chip track/hold is applied to this pin. It is a high impedance input and the input voltage range is 0 V to 2.5 V. 15 AGND Analog Ground. Ground reference for track/hold, comparator, and DAC. 16 VIN1 Analog Input Channel 1. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 17 VIN2 Analog Input Channel 2. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 18 VIN3 Analog Input Channel 3. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 19 VIN4 Analog Input Channel 4. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 20 VIN5 Analog Input Channel 5. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 21 VIN6 Analog Input Channel 6. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 22 VIN7 Analog Input Channel 7. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 23 VIN8 Analog Input Channel 8. Single-ended analog input. The analog input range on is ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4) and 0 V to 2.5 V (AD7890-2). The channel to be converted is selected using the A0, A1, and A2 bits in the control register. The multiplexer has guaranteed break-before-make operation. 24 REF OUT/REF IN Voltage Reference Output/Input. The part can be used with either its own internal reference or with an external reference source. The on-chip 2.5 V reference voltage is provided at this pin. When using this internal reference as the reference source for the part, REF OUT should decoupled to AGND with a 0.1 μF disc ceramic capacitor. The output impedance of this reference source is typically 2 kΩ. When using an external reference source as the reference voltage for the part, the reference source should be connected to this pin. This overdrives the internal reference and provides the reference source for the part. The REF IN input is buffered on-chip. The nominal reference voltage for correct operation of the AD7890 is 2.5 V. |
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