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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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DAC7634EB bảng dữ liệu(PDF) 18 Page - Texas Instruments |
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DAC7634EB bảng dữ liệu(HTML) 18 Page - Texas Instruments |
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18 / 33 page  www.ti.com NC NC SDI DGND CLK DGND LDAC DGND LOAD DGND CS DGND SDO DGND RSTSEL DGND RST DGND NC NC DGND DGND V DD V DD V OUTA Sense V OUTA AGND V SS V REFL AB Sense V REFL AB V REFH AB V REFH AB Sense V OUTB Sense V OUTB V OUTC Sense V OUTC V REFH CD Sense V REFH CD V REFL CD V REFL CD Sense V OUTD Sense V OUTD V SS V SS AGND AGND V CC V CC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 DAC7634 Reset DAC Registers Chips Select Serial Data Out Serial Data In Clock Load DAC Registers Load NC = No Connection –2.5V to +2.5V –2.5V to +2.5V –2.5V to +2.5V –2.5V to +2.5V +2.5V +2.5V –2.5V –2.5V +5V +5V –5V –5V +5V + + 1 µF 1 µF 0.1 µF 0.1 µF 0.1 µF 1 µF ANALOG OUTPUTS DAC7634 SBAS134B – JULY 2004 – REVISED DECEMBER 2005 Figure 50. Basic Dual-Supply Operation of the DAC7634 converter with a 2.5 V full-scale range has a 1-LSB value of 38 µV. With a load current of 1 mA, series wiring and connector resistance of only 40 m Ω (R W2) When VSS = –5V (dual supply operation), the output causes a voltage drop of 40 µV, as shown in amplifier can swing to within 2.25 V of the supply Figure 51. To understand what this means in terms of rails, specified over the –40°C to 85°C temperature a system layout, the resistivity of a typical 1-ounce range. When VSS = 0 V (single-supply operation), and copper-clad printed-circuit board is 1.2 m Ω per with RLOAD also connected to ground, the output can square. For a 1-mA load, a 10-mil wide printed-circuit swing to ground. Care must also be taken when conductor 600 mil long results in a voltage drop of 30 measuring the zero-scale error when VSS = 0 V. µV. Because the output voltage cannot swing below The DAC7634 offers a force and sense output ground, the output voltage may not change for the configuration for the high open-loop gain output first few digital input codes (0000H, 0001H, 0002H, amplifier. This feature allows the loop around the etc.) if the output amplifier has a negative offset. At output amplifier to be closed at the load (as shown in the negative limit of –2 mV, the first specified output Figure 51), thus ensuring an accurate output voltage. starts at code 0040H. Due to the high accuracy of these D/A converters, system design problems such as grounding and contact resistance become important. A 16-bit 18 |
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