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AD7866 データシート(PDF) 5 Page - Analog Devices |
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AD7866 データシート(HTML) 5 Page - Analog Devices |
5 / 20 page REV. 0 AD7866 –5– ORDERING GUIDE Resolution Package Model Temperature Range (Bits) Package Description Option AD7866ARU –40 °C to +85°C 12 Thin Shrink SO (TSSOP) RU-20 AD7866BRU –40 °C to +85°C 12 Thin Shrink SO (TSSOP) RU-20 EVAL-AD7866CB 1 Evaluation Board (TSSOP) EVAL-CONTROL BRD2 2 Controller Board NOTES 1This can be used as a stand-alone evaluation board or in conjunction with the evaluation board controller for evaluation/demonstration purposes. 2This evaluation board controller is a complete unit, allowing a PC to control and communicate with all Analog Devices evaluation boards ending in the CB designators. PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Function 1 REF SELECT Internal/External Reference Selection Pin. Logic Input. If this pin is tied to GND, the on-chip 2.5 V reference is used as the reference source for both ADC A and ADC B. In addition, pins VREF, DCAPA, and DCAPB must be tied to decoupling capacitors. If the REF SELECT pin is tied to a logic high, an external reference can be supplied to the AD7866 through the VREF pin, in which case decoupling capacitors are required on DCAPA and DCAPB. However, if the VREF pin is tied to AGND while REF SELECT is tied to a logic low, an individual external reference can be applied to both ADC A and ADC B through pins DCAPA and DCAPB, respectively. See Reference section. 2, 9 DCAPB, DCAPA Decoupling capacitors are connected to these pins to decouple the reference buffer for each respective ADC. The on-chip reference can be taken from these pins and applied externally to the rest of a system. Depending on the polarity of the REF SELECT pin and the configuration of the VREF pin, these pins can also be used to input a separate external reference to each ADC. The range of the external reference is dependent on the analog input range selected. See Reference section. 3, 8 AGND Analog Ground. Ground reference point for all analog circuitry on the AD7866. All analog input signals and any external reference signal should be referred to this AGND voltage. Both of these pins should connect to the AGND plane of a system. The AGND and DGND voltages should ideally be at the same potential and must not be more than 0.3 V apart even on a transient basis. 4, 5 VB2, VB1 Analog Inputs of ADC B. Single-ended analog input channels. The input range on each channel is 0 V to VREF or a 2 × VREF range depending on the polarity of the RANGE pin upon the falling edge of CS. 6, 7 VA2, VA1 Analog Inputs of ADC A. Single-ended analog input channels. The input range on each channel is 0 V to VREF or a 2 × VREF range depending on the polarity of the RANGE pin upon the falling edge of CS. 10 VREF Reference Decoupling Pin and External Reference Selection Pin. This pin is connected to the inter- nal reference and requires a decoupling capacitor. The nominal reference voltage is 2.5 V and this appears at the pin; however, if the internal reference is to be used externally in a system, it must be taken from either the DCAPA or DCAPB pins. This pin is also used in conjunction with the REF SELECT pin when applying an external reference to the AD7866. See REF SELECT pin description. PIN CONFIGURATION TOP VIEW (Not to Scale) 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 AD7866 REF SELECT A0 DCAPB AGND VB2 VB1 VA2 VA1 AGND DCAPA VREF CS SCLK VDRIVE DOUTB DOUTA DGND DVDD AVDD RANGE |
同様の部品番号 - AD7866 |
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同様の説明 - AD7866 |
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