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AD7249ARZ датащи(PDF) 8 Page - Analog Devices |
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AD7249ARZ датащи(HTML) 8 Page - Analog Devices |
8 / 12 page REV. C –8– AD7249 t2 t5 t4 t3 t10 t6 t7 t8 t9 DB15 DB14 DB13 DB12 DB11 DB0 DB15 DB14 DB13 DB12 DB10 DB0 DON'T CARE DON'T CARE DON'T CARE DAC SELECT =0 MSB DON'T CARE DON'T CARE DON'T CARE DAC SELECT =1 MSB LSB LSB DAC A DAC B t1 SCLK SYNC SDIN LDAC CLR Figure 8. Timing Diagram TRANSFER FUNCTION The internal scaling resistors provided on the AD7249 allow several output voltage ranges. The part can produce unipolar output ranges of 0 V to +5 V or 0 V to +10 V and a bipolar output range of ±5 V. Connections for the various ranges are outlined below. Since each DAC has its own ROFS input the two DACs can be set up for different output ranges. Unipolar (0 V to +10 V) Configuration The first of the configurations provides an output voltage range of 0 V to +10 V. This is achieved by connecting the output offset resistor ROFSA, ROFSB (Pin 3, 16) to AGND. Natural Bi- nary data format is selected by connecting BIN/COMP (Pin 7) to DGND. In this configuration, the AD7249 can be operated using either single or dual supplies. Note that the VDD supply is AD7249* VDD VDD 2R 2R 2R 2R A1 A2 12-BIT DAC A 12-BIT DAC B REFOUT REFIN ROFSA VOUTA 0V TO 10V ROFSB VOUTB 0V TO 10V BIN/COMP DGND AGND 0V OR VSS VSS *ADDITIONAL PINS OMITTED FOR CLARITY. Figure 9. Unipolar (0 V to +10 V) Configuration restricted to +15 V ± 10% for this range in order to maintain sufficient amplifier headroom. Dual supplies may be used to improve settling time and give increased current sink capability for the amplifier. Figure 9 shows the connection diagram for unipolar operation of the AD7249. Table I shows the digital code vs. analog output for this configuration. Unipolar (0 V to +5 V) Configuration The 0 V to +5 V output voltage range is achieved by tying ROFSA to VOUTA or ROFSB to VOUTB. Once again, the AD7249 can be operated using either single or dual supplies. The table for output voltage versus digital code is as in Table I, with 2REFIN replaced by REFIN. Note, for this range, 1 LSB = REFIN × (2–12) = (REFIN/4096). Table I. Unipolar Code Table (0 V to +10 V Range) Input Data Word MSB LSB Analog Output, VOUT XXXY 1111 1111 1111 +2REFIN × (4095/4096) XXXY 1000 0000 0001 +2REFIN × (2049/4096) XXXY 1000 0000 0000 +2REFIN × (2048/4096) = +REFIN XXXY 0111 1111 1111 +2REFIN × (2047/4096) XXXY 0000 0000 0001 +2REFIN × (1/4096) XXXY 0000 0000 0000 0 V X = Don’t Care. Y = DAC Select Bit, 0 = DAC A, 1= DAC B. Note: 1 LSB = 2REFIN/4096. |
Аналогичный номер детали - AD7249ARZ |
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Аналогичное описание - AD7249ARZ |
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