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AD7393 датащи(PDF) 10 Page - Analog Devices |
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AD7393 датащи(HTML) 10 Page - Analog Devices |
10 / 11 page AD7392/AD7393 –10– REV. A UNIPOLAR OUTPUT OPERATION This is the basic mode of operation for the AD7392. As shown in Figure 29, the AD7392 has been designed to drive loads as low as 5 k Ω in parallel with 100 pF. The code table for this operation is shown in Table II. 1 20 19 17, 18 0.01 F +2.7V TO +5.5V VDD AGND/DGND AD7392 0.1 F10 F DIGITAL INTERFACE CIRCUITRY OMITTED FOR CLARITY VOUT RL 5k CL 100pF REF EXT REF R Figure 29. AD7392 Unipolar Output Operation Table II. Unipolar Code Table Hexadecimal Decimal Output Number Number Voltage (V) in DAC Register in DAC Register VREF = 2.5 V FFF 4095 2.4994 801 2049 1.2506 800 2048 1.2500 7FF 2047 1.2494 000 0 0 The circuit can be configured with an external reference plus power supply or powered from a single dedicated regulator or reference depending on the application performance re- quirements. BIPOLAR OUTPUT OPERATION Although the AD7393 has been designed for single-supply op- eration, the output can be easily configured for bipolar opera- tion. A typical circuit is shown in Figure 30. This circuit uses a clean regulated +5 V supply for power, which also provides the circuit’s reference voltage. Since the AD7393 output span swings from ground to very near +5 V, it is necessary to choose an exter- nal amplifier with a common-mode input voltage range that extends to its positive supply rail. The micropower consump- tion OP196 has been designed just for this purpose and results in only 50 microamps of maximum current consumption. Con- nection of the equal valued 470 k Ω resistors results in a differen- tial amplifier mode of operation with a voltage gain of two, which produces a circuit output span of ten volts (that is, –5 V to +5 V). As the DAC is programmed from zero-code 000H to midscale 200H to full scale 3FFH, the circuit output voltage VO is set at –5 V, 0 V and +5 V (minus 1 LSB). The output voltage VO is coded in offset binary according to Equation 4. V O = D 512 –1 × 5 Equation 4 where D is the decimal code loaded in the AD7393 DAC regis- ter. Note that the LSB step size is 10/1024 = 10 mV. This cir- cuit has been optimized for micropower consumption including the 470 k Ω gain setting resistors, which should have low tem- perature coefficients to maintain accuracy and matching (prefer- ably the same resistor material, such as metal film). If better stability is required, the power supply could be substituted with a precision reference voltage such as the low drop out REF195, which can easily supply the circuit’s 162 µA of current, and still provide additional power for the load connected to VO. The micropower REF195 is guaranteed to source 10 mA output drive current, but only consumes 50 µA internally. If higher resolution is required, the AD7392 can be used with the addi- tion of two more bits of data inserted into the software coding, which would result in a 2.5 mV LSB step size. Table III shows examples of nominal output voltages VO provided by the Bipolar Operation circuit application. VO C VDD REF GND <100 A <2 A 470k +5V ISY < 162 A OP196 470k +5V –5V BIPOLAR OUTPUT SWING –5V AD7393 DIGITAL INTERFACE CIRCUITRY OMITTED FOR CLARITY VOUT <50 A Figure 30. Bipolar Output Operation Table III. Bipolar Code Table Hexadecimal Decimal Analog Number Number Output In DAC Register in DAC Register Voltage (V) 3FF 1023 4.9902 201 513 0.0097 200 512 0.0000 1FF 511 –0.0097 000 0 –5.0000 |
Аналогичный номер детали - AD7393 |
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Аналогичное описание - AD7393 |
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