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AD7415ARTZ-1500RL7 Arkusz danych(PDF) 8 Page - Analog Devices

Numer części AD7415ARTZ-1500RL7
Szczegółowy opis  0.5C Accurate, 10-Bit Digital Temperature Sensors in SOT-23
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD7415ARTZ-1500RL7 Arkusz danych(HTML) 8 Page - Analog Devices

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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.


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