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DAC08CSZ 数据表(PDF) 11 Page - Analog Devices |
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DAC08CSZ 数据表(HTML) 11 Page - Analog Devices |
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11 / 21 page ![]() Data Sheet DAC08 Rev. D | Page 11 of 21 BASIC CONNECTIONS +VREF RREF IIN RIN VIN 14 15 R15 (OPTIONAL) HIGH INPUT IMPEDANCE +VREF MUST BE ABOVE PEAK POSITIVE SWING OF VIN RREF ≈ R15 IREF ≥ PEAK NEGATIVE SWING OF IIN IREF RREF VIN +VREF 14 15 14 15 Figure 23. Accommodating Bipolar References R15 IREF FOR FIXED REFERENCE, TTL OPERATION, TYPICAL VALUES ARE: VREF = 10.000V RREF = 5.000kΩ R15 = RREF CC = 0.01µF VLC = 0V (GROUND) MSB B1 B2 B3 B4 B5 B6 B7 LSB B8 V– CC COMP 0.1 µF V– V+ VLC IO V+ VREF (+) +VREF RREF (R14) VREF (–) 14 15 4 2 5 6 7 8 9 10 11 12 3 16 13 1 IO 0.1 µF IFR = × IO + IO = IFR FOR ALL LOGIC STATES +VREF RREF 255 256 Figure 24. Basic Positive Reference Operation IREF = 2.000mA MSB B1 B2 B3 B4 B5 B6 B7 LSB B8 5.000k Ω EO EO 5.000k Ω 4 2 IO IO 14 FULL RANGE HALF SCALE +LSB HALF SCALE HALF SCALE –LSB ZERO SCALE +LSB ZERO SCALE B1 1 1 1 0 0 0 B2 1 0 0 1 0 0 B3 1 0 0 1 0 0 B4 1 0 0 1 0 0 B5 1 1 1 0 0 0 B6 1 0 0 1 0 0 B7 1 0 0 1 0 0 B8 1 1 0 1 1 0 IO 1.992 1.008 1.000 0.992 0.008 0.000 IO 0.000 0.984 0.992 1.000 1.984 1.992 EO –9.960 –5.040 –5.000 –4.960 –0.040 0.000 EO –0.000 –4.920 –4.960 –5.000 –9.920 –9.960 Figure 25. Basic Unipolar Negative Operation IREF = 2.000mA MSB B1 B2 B3 B4 B5 B6 B7 LSB B8 10V 10k Ω 10k Ω EO EO 4 2 IO IO 14 POS. FULL RANGE POS. FULL RANGE –LSB ZERO SCALE +LSB ZERO SCALE ZERO SCALE –LSB NEG. FULL SCALE +LSB NEG. FULL SCALE B1 1 1 1 1 0 0 0 B2 1 1 0 0 1 0 0 B3 1 1 0 0 1 0 0 B4 1 1 0 0 1 0 0 B5 1 1 0 0 1 0 0 B6 1 1 0 0 1 0 0 B7 1 1 0 0 1 0 0 B8 1 0 1 0 1 1 0 EO –9.920 –9.840 –0.080 0.000 +0.080 +9.920 +10.000 EO +10.000 +9.920 +0.160 +0.080 0.000 –9.840 –9.920 Figure 26. Basic Bipolar Output Operation |
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