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AD7657BSTZ-REEL Datasheet(PDF) 11 Page - Analog Devices |
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AD7657BSTZ-REEL Datasheet(HTML) 11 Page - Analog Devices |
11 / 25 page Preliminary Technical Data AD7658/AD7657/AD7656 Rev. PrI | Page 11 of 25 PIN FUNCTIONAL DESCRIPTIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 AD7656 TOP VIEW (Not to Scale) PIN 1 IDENTIFIER DB7/HBEN/DCEN DB6/SCLK DB5/DCIN A DB4/DCIN B DB3/DCIN C DB2/SEL C DB1/SEL B VDRIVE DB13 DB12 DB11 DB10/SDATA C DB9/SDATA B DB8/SDATA A DGND DB14/REFBUFEN/DIS V3 AGND AGND V2 AVCC AVCC V1 AVCC AVCC AVCC V5 AGND AGND V4 AVCC V6 Table 6. AD7658/AD7657/AD7656 Pin Function Descriptions Pin Mnemonic Description REFCAPA, REFCAPB, REFCAPC Decoupling capacitors are connected to these pins to decouple the reference buffer for each ADC pair. Each REFCAP pin should be decoupled to AGND using 10 µF and 100 nF capacitors. V1 – V6 Analog Input1-6. These are six single-ended Analog inputs. The Analog input range on these channels is ddetermined by the RANGE pin. AGND Analog Ground. Ground reference point for all analog circuitry on the AD7658/AD7657/AD7656. All analog input signals and any external reference signal should be referred to this AGND voltage. All eleven of these AGND pins should be connected to the AGND plane of a system. The AGND and DGND voltages ideally should be at the same potential and must not be more than 0.3 V apart, even on a transient basis. DVCC Digital Power. Normally at 5V. The DVCC and AVCC voltages should ideally be at the same potential and must not be more than 0.3 V apart even on a transient basis. This supply should be decoupled to DGND. 10 µF and 100 nF decoupling capacitors should be placed on the DVCC pin. VDRIVE Logic power supply input. The voltage supplied at this pin determines at what voltage the interface will operate. Nominally at the same supply as the supply of the host interface. This pin should be decoupled to DGND. 10 µF and 100 nF decoupling capacitors should be placed on the VDRIVE pin. |
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