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AD5700 Folha de dados(PDF) 6 Page - Analog Devices |
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AD5700 Folha de dados(HTML) 6 Page - Analog Devices |
6 / 8 page CN-0267 Circuit Note Rev. B | Page 6 of 8 The results are shown in Table 2 and were measured at the following conditions: • REGOUT = 3.3 V • ADuCM360 M3 core clock = 2 MHz • Both ADCs converting at 50 samples per second • ADC0 has both buffers on and gain = 8 • ADC1 has both buffers on and gain = 16 • RTD excitation current = 200 µA • SPI communicating to AD5421 with serial clock = 100 kHz • HART communicating The circuit with all relevant analog and digital blocks, including the input sensor, consumes power supply current within the budget allowed at the minimum 4 mA loop current. Table 2. Power Supply Current from AD5421, REGOUT = 3.3V Input Sensor Voltage T5 to T6 Maximum (mV) Current REGOUT Maximum (mA) None 24.4 2.44 24PCDFA6D (5 kΩ, 0.66 mA at 3.3 V) 31.0 3.10 In the second method for assessing the circuit power consumption, the circuit was verified to function as expected with the analog output current set to the minimum of 4 mA while performing HART communication. The result showed that the circuit delivered the 4 mA current and showed no distortion of the HART output signal. Primary Sensor Input Performance The ADuCM360 integrates most of the analog front-end on chip; therefore, the performance of the analog input is primarily determined by the specifications of the ADuCM360. The level of noise is the main factor that can be influenced by the interaction of the analog front-end with the rest of the circuitry on the board. Thus, tests were carried out to focus on the noise and related resolution performance of the system. The demonstration was configured to transmit data from the primary analog input, expressed as pressure in kPa, over the HART communication. One hundred samples were captured, and a basic data analysis to quantify the performance was completed. Two of the tests involved the following: • The first test was performed with a standard pressure sensor (Honeywell 24PCDFA6D) soldered directly on the board. • A second test was performed with the primary input signal generated by a set of fixed and variable resistors, as shown in Figure 7. Figure 7. Primary Input Signal Generated by a Set of Resistors ADuCM360 AIN0 1kΩ 27kΩ 10kΩ 18kΩ 1kΩ 0.1µF 0.01µF 0.01µF AIN1 AVDD VREF– GND_SW VREF+ ADC0 |
Nº de peça semelhante - AD5700 |
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Descrição semelhante - AD5700 |
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