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AD7415ARTZ-1500RL7 Arkusz danych(PDF) 8 Page - Analog Devices |
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AD7415ARTZ-1500RL7 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 20 page AD7414/AD7415 Rev. F | Page 8 of 20 VDD VOUT+ VOUT– TO ADC SENSING TRANSISTOR SENSING TRANSISTOR II × N Figure 7. Temperature Measurement Technique Figure 7 shows the method the AD7414/AD7415 use to measure the ambient device temperature. To measure ΔVBE, the sensor (substrate transistor) is switched between operating currents of I and N × I. The resulting waveform is passed through a chopper stabilized amplifier that performs the functions of amplification and rectification of the waveform to produce a dc voltage proportional to ΔVBE. This voltage is measured by the ADC to give a temperature output in 10-bit, twos complement format. TEMPERATURE DATA FORMAT The temperature resolution of the ADC is 0.25°C, which corresponds to 1 LSB of the ADC. The ADC can theoretically measure a temperature span of 255°C; the lowest practical value is limited to −40°C due to the device maximum ratings. The A grade can measure a temperature range of −40°C to +125°C. (Temperature data format is shown in Table 5.) Table 5. A Grade Temperature Data Format Temperature Digital Output DB9…DB0 −55°C 11 0010 0100 −50°C 11 0011 1000 −25°C 11 1001 1100 −0.25°C 11 1111 1111 0°C 00 0000 0000 +0.25°C 00 0000 0001 +10°C 00 0010 1000 +25°C 00 0110 0100 +50°C 00 1100 1000 +75°C 01 0010 1100 +100°C 01 1001 0000 +125°C 01 1111 0100 The grade temperature conversion formula follows: 4 ) (d Code ADC e Temperatur Positive = 4 512 ) ( − = d Code ADC e Temperatur Negative Note that DB9 is removed from the ADC code in the negative temperature formula. |
Podobny numer części - AD7415ARTZ-1500RL7 |
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Podobny opis - AD7415ARTZ-1500RL7 |
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