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ADM1023 Scheda tecnica(PDF) 5 Page - Analog Devices |
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ADM1023 Scheda tecnica(HTML) 5 Page - Analog Devices |
5 / 12 page ADM1023 –5– REV. A 4 0 2 FREQUENCY – Hz 10mV p-p 100k 1M 10M 100M 1G 1 3 Figure 8. Temperature Error vs. Differential-Mode Noise Frequency CONVERSION RATE – Hz 250 0.125 0.25 0.5 8 300 350 400 550 4 0.0625 450 500 200 150 100 50 5 VOLTS 3.3 VOLTS 2 1 Figure 9. Operating Supply Current vs. Conversion Rate, VDD = 5 V and 3 V FUNCTIONAL DESCRIPTION The ADM1023 contains a two-channel, A-to-D converter with special input-signal conditioning to enable operation with remote and on-chip diode temperature sensors. When the ADM1023 is operating normally, the A-to-D converter operates in a free-running mode. The analog input multiplexer alternately selects either the on-chip temperature sensor to measure its local temperature, or the remote temperature sensor. These signals are digitized by the ADC and the results are stored in the Local and Remote Temperature Value Registers. Only the eight most significant bits of the local temperature value are stored as an 8-bit binary word. The remote temperature value is stored as an 11-bit, binary word in two registers. The eight MSBs are stored in the Remote Temperature Value High Byte Register at address 01h. The three LSBs are stored, left-justified, in the Remote Temperature Value High Byte Register at address 10h. Error sources such as PCB track resistance and clock noise can introduce offset errors into measurements on the Remote Channel. To achieve the specified accuracy on this channel, these offsets must be removed, and two Offset Registers are provided for this purpose at addresses 11h and 12h. An offset value may automatically be added to or subtracted from the measurement by writing an 11 bit, two’s complement value to registers 11h (high byte) and 12h (low byte, left- justified). The offset registers default to zero at power-up and will have no effect if nothing is written to them. The measurement results are compared with Local and Remote, High and Low Temperature Limits, stored in six on-chip Limit Registers. As with the measured value, the local temperature limits are stored as 8-bit values and the remote temperature limits as 11-bit values. Out-of-limit comparisons generate flags that are stored in the status register, and one or more out-of-limit results will cause the ALERT output to pull low. Registers can be programmed, and the device controlled and configured, via the serial System Management Bus. The con- tents of any register can also be read back via the SMBus. Control and configuration functions consist of: • Switching the device between normal operation and standby mode. • Masking or enabling the ALERT output. • Selecting the conversion rate. On initial power-up the remote and local temperature values default to –128 °C. Since the device normally powers up convert- ing, a measure of local and remote temperature is made and these 0 20 SUPPLY VOLTAGE – V 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 40 60 80 100 –20 Figure 10. Standby Supply Current vs. Supply Voltage TIME – Seconds 0 25 50 75 100 125 REMOTE TEMPERATURE INT TEMPERATURE 0 2 3 4 567 89 10 1 Figure 11. Response to Thermal Shock |
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