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參數(shù)資料
| 型號(hào)： | EVAL-AD7298SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7298 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | DSP，串行，SPI? |
| 工作溫度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7298 |
| 已供物品： | 板，纜線，CD |
AD7298
Rev. B | Page 14 of 24
111...111
111...110
111...000
011...111
000...010
000...001
000...000
1LSB = VREF/4096
ANALOG INPUT
NOTES
1. VREF IS 2.5V.
AD
C
O
D
E
+VREF –1LSB
1LSB
0V
08754-007
Figure 23. Straight Binary Transfer Characteristic
TEMPERATURE SENSOR OPERATION
The AD7298 contains one local temperature sensor. The
on-chip, band gap temperature sensor measures the temp-
erature of the AD7298 die.
The temperature sensor module on the AD7298 is based on
the three-current principle (see Figure 24), where three currents
are passed through a diode and the forward voltage drop is
measured, allowing the temperature to be calculated free of
errors caused by series resistance.
I4 × I
INTERNAL
SENSE
TRANSISTOR
BIAS
DIODE
VDD
8 × I
IBIAS
VOUT+
VOUT–
TO ADC
0
875
4-
00
8
Figure 24. Top-Level Structure of Internal Temperature Sensor
The temperature conversion consists of two phases, the integra-
tion followed by the conversion. The integration is initiated on
the CS falling edge. It takes a period of approximately 100 μs to
complete the integration and conversion of the temperature
result. When the integration is completed, the conversion is
initiated automatically. Once the temperature integration is
initiated, the TSENSE_BUSY signal goes high to indicate that a
temperature conversion is in progress and remains high until
the conversion is completed.
Theoretically, the temperature measuring circuit can measure
temperatures from –512°C to +511°C with a resolution of
0.25°C. However, temperatures outside TA (the specified
temperature range for the AD7298) are outside the guaranteed
operating temperature range of the device. The temperature
sensor is selected by setting the TSENSE bit in the control register.
TEMPERATURE SENSOR AVERAGING
The AD7298 incorporates a temperature sensor averaging
feature to enhance the accuracy of the temperature measure-
ments. To enable the temperature sensor averaging feature, both
the TSENSEAVG bit and the TSENSE bit must be enabled in the
control register. In this mode the temperature is internally
averaged to reduce the effect of noise on the temperature result.
The temperature is measured each time a TSENSE conversion is
performed and a moving average method is used to determine
the result in the TSENSE Result Register. The average result is
given by the following equation:
()
Result
Current
Result
Average
Previous
AVG
T
SENSE
_
8
1
_
8
7
+
=
The TSENSE result read when averaging is enabled is the
TSENSEAVG result, a moving average temperature measurement.
The first TSENSE conversion result given by the AD7298 after the
temperature sensor and averaging mode has been selected in
the control register (Bit D1 and Bit D5) is the actual first TSENSE
conversion result. If the control register is written to and the
content of the TSENSEAVG bit changed, the averaging function is
reset and the next TSENSE average conversion result is the current
temperature conversion result. If the status of the TSENSEAVG bit
is not changed on successive writes to the control register, the
averaging function is reinitialized and continues calculating the
cumulative average.
The user has the option of disabling the averaging by setting
Bit TSENSEAVG to 0 in the control register. The AD7298 defaults
on power-up with the averaging function disabled. The total
time to measure a temperature channel is typically 100 μs.
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