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AD7243AN Fiches technique(PDF) 8 Page - Analog Devices |
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AD7243AN Fiches technique(HTML) 8 Page - Analog Devices |
8 / 12 page AD7243 –8– REV. A APPLYING THE AD7243 Power Supply Decoupling To achieve optimum performance when using the AD7243, the VDD and VSS lines should each be decoupled to DGND using 0.1 µF capacitors. In noisy environments it is recommended that 10 µF capacitors be connected in parallel with the 0.1 µF capacitors. The internal scaling resistors provided on the AD7243 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 out- put range of ±5 V. Connections for the various ranges are out- lined below. 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 ROFS (Pin 13) to AGND. Natural Binary data format is selected by connecting BIN/COMP (Pin 4) to DGND. In this configuration, the AD7243 can be operated using either single or dual supplies. Note that the VDD supply must be ≥+14.25 V for this range in order to maintain sufficient amplifier head- room. 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 AD7243. Table I shows the digital code vs. analog output for this configuration. DAC AGND DGND REFOUT REFIN ROFS VOUT VDD 2R 2R AD7243* BIN/ COMP 0V OR VSS 0V TO + 10V *ADDITIONAL PINS OMITTED FOR CLARITY VDD VSS Figure 9. Unipolar (0 V to +10 V) Configuration Table I. Unipolar Code Table (0 V to +10 V Range) Input Data Word MSB LSB Analog Output, VOUT XXXX 1111 1111 1111 +2 REFIN × (4095/4096) XXXX 1000 0000 0001 +2 REFIN × (2049/4096) XXXX 1000 0000 0000 +2 REFIN × (2048/4096)= +REFIN XXXX 0111 1111 1111 +2 REFIN × (2047/4096) XXXX 0000 0000 0001 +2 REFIN × (1/4096) XXXX 0000 0000 0000 0 V X = Don’t Care. Note: 1 LSB = 2 REFIN/4096. Unipolar (0 V to +5 V) Configuration The 0 V to +5 V output voltage range is achieved by connecting ROFS to VOUT. Once again, the AD7243 can be operated using either single or dual supplies. The table for output voltage vs. digital code is as in Table I, with 2REFIN replaced by REFIN. Note, for this range, 1 LSB = REFIN • (2 –12 ) = (REFIN/4096). Bipolar ( 5 V) Configuration The bipolar configuration for the AD7243, which gives an out- put range of –5 V to +5 V, is achieved by connecting ROFS to REFIN. The AD7243 must be operated from dual supplies to achieve this output voltage range. Either offset binary or two’s complement data format may be selected. Figure 10 shows the connection diagram for bipolar operation. An AD586 provides the reference voltage for the DAC but this could be provided by the on-chip reference by connecting REFOUT to REFIN. VDD DAC AGND DGND REFIN ROFS 2R 2R AD7243* BIN/ COMP –5V TO + 5V *ADDITIONAL PINS OMITTED FOR CLARITY AD586 GND +VIN VOUT VDD VSS VSS VOUT VDD Figure 10. Bipolar Configuration with External Reference Bipolar Operation (Two’s Complement Data Format) The AD7243 is configured for two’s complement data format by connecting BIN/COMP (Pin 4) high. The analog output vs. digital code is shown in Table II. Table II. Two’s Complement Bipolar Code Table Input Data Word MSB LSB Analog Output, VOUT XXXX 0111 1111 1111 +REFIN × (2047/2048) XXXX 0000 0000 0001 +REFIN × (1/2048) XXXX 0000 0000 0000 0 V XXXX 1111 1111 1111 –REFIN × (1/2048) XXXX 1000 0000 0001 –REFIN × (2047/2048) XXXX 1000 0000 0000 –REFIN × (2048/2048) = –REFIN X = Don’t Care. Note: 1 LSB = REFIN/2048. Bipolar Operation (Offset Binary Data Format) The AD7243 is configured for Offset Binary data format by connecting BIN/COMP (Pin 4) low. The analog output vs. digi- tal code may be obtained by inverting the MSB in Table II. |
Numéro de pièce similaire - AD7243AN |
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Description similaire - AD7243AN |
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