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AD7247AAN Arkusz danych(PDF) 10 Page - Analog Devices |
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AD7247AAN Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 12 page AD7237A/AD7247A REV. 0 –10– APPLYING THE AD7237A/AD7247A The internal scaling resistors provided on the AD7237A/ AD7247A 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 on each part 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 off- set resistor, ROFSA, or ROFSB, to AGND (GND for AD7247A). In this configuration, the AD7237A/AD7247A can be operated from single or dual supplies. Figure 8 shows the connection dia- gram for unipolar operation for DAC A of the AD7237A, while the table for output voltage versus digital code in the DAC latch is shown in Table III. Similar connections apply to the AD7247A. Figure 8. Unipolar (0 to +10 V) Configuration Table III. Unipolar Code Table (0 to +10 V Range) DAC Latch Contents MSB LSB Analog Output, VOUT 1111 1111 1111 +2 • REF IN (4095/4096) 1000 0000 0001 +2 • REF IN (2049/4096) 1000 0000 0000 +2 • REF IN (2048/4096) = +REF IN 0111 1111 1111 +2 • REF IN (2047/4096) 0000 0000 0001 +2 • REF IN (1/4096) 0000 0000 0000 0 V Note: 1 LSB = REF IN/2048. Unipolar (0 V to +5 V) Configuration The 0 V to +5 V output voltage range is achieved by tying ROFSA or ROFSB to VOUTA or VOUTB. Once again, the AD7237A/ AD7247A can be operated single supply or from dual supplies. The table for output voltage versus digital code is as in Table III, with 2 • REF IN replaced by REF IN. Note, for this range, 1 LSB = REF IN • (2 –12) = (REF IN/4096). Bipolar Configuration The bipolar configuration for the AD7237A/AD7247A, which gives an output range of –5 V to +5 V, is achieved by connect- ing ROFSA, or ROFSB, to REF IN. The AD7237A/AD7247A must be operated from dual supplies to achieve this output voltage range. Figure 9 shows the connection diagram for bipolar opera- tion for DAC A of the AD7247A. An AD586 provides the refer- ence voltage for the DAC but this could be provided by the on-chip reference by connecting REF OUT to REF IN. The code table for bipolar operation is shown in Table IV. Similar connections apply for the AD7237A. Figure 9. Bipolar Configuration Table IV. Bipolar Code Table DAC Latch Contents MSB LSB Analog Output, VOUT 1111 1111 1111 +REF IN • (2047/2048) 1000 0000 0001 +REF IN • (1/2048) 1000 0000 0000 0 V 0111 1111 1111 –REF IN • (1/2048) 0000 0000 0001 –REF IN • (2047/2048) 0000 0000 0000 –REF IN • (2048/2048) = –REF IN Note: 1 LSB = REF IN/2048. |
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