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DAC08AQ Arkusz danych(PDF) 8 Page - Analog Devices |
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DAC08AQ Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 12 page REV. B DAC08 –8– V+, POSITIVE POWER SUPPLY – V dc 10 8 7 6 0 5 4 3 2 1 020 2 9 4 6 8 10 12 14 16 18 I– I+ ALL BITS “HIGH” OR “LOW” TPC 10. Power Supply Current vs. V+ V–, NEGATIVE POWER SUPPLY – V dc 10 8 7 6 0 5 4 3 2 1 –0 –20 –2 9 –4 –6 –8 –10 –12 –14 –16 –18 BITS MAY BE “HIGH” OR “LOW” I– WITH IREF = 2mA I– WITH IREF = 0.2mA I+ I– WITH IREF = 1mA TPC 11. Power Supply Current vs. V– 14 15 +VREF IREF RREF IIN RIN VIN VIN 14 15 R15 (OPTIONAL) RREF +VREF HIGH INPUT IMPEDANCE +VREF MUST BE ABOVE PEAK POSITIVE SWING OF V IN RREF R15 IREF PEAK NEGATIVE SWING OF IIN Figure 7. Accommodating Bipolar References 14 15 RREF (R14) R15 IREF +VREF 6789 10 11 12 4 2 FOR FIXED REFERENCE, TTL OPERATION, TYPICAL VALUES ARE: VREF = 10.000V RREF = 5.000k R15 = RREF CC = 0.01 F VLC = 0V (GROUND) 5 MSB B1 B2 B3 B4 B5 B6 B7 LSB B8 VREF (+) VREF (–) 316 13 1 V– CC COMP 0.1 F 0.1 F V– V+ VLC IO IO IFR = +VREF RREF 255 256 IO + IO = IFR FOR ALL LOGIC STATES V+ Figure 8. Basic Positive Reference Operation BASIC CONNECTIONS TEMPERATURE – C 10 9 8 7 6 0 5 4 3 2 1 –50 0 50 100 150 I– I+ ALL BITS “HIGH” OR “LOW” IREF = 2.0mA V– = –15V V+ = +15V TPC 12. Power Supply Current vs. Temperature 14 IREF = 2.000mA 4 2 MSB B1 B2 B3 B4 B5 B6 B7 LSB B8 IO IO 5.000k 5.000k EO EO 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 0 0 1 0 0 B6 1 0 0 1 0 0 B7 1 0 0 1 0 0 B8 1 1 0 1 1 0 IOmA 1.992 1.008 1.000 0.992 0.008 0.000 IOmA 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 –9.860 Figure 9. Basic Unipolar Negative Operation |
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