参数资料
| 型号： | EVAL-ADE7878EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 41/100页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADE7878 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是，DSP |
| 已用 IC / 零件： | ADE7878 |
| 次要属性： | USB 接口 |
| 已供物品： | 板 |
| 其它名称： | Q4472972 Q4684026 Q5015773 |
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? α ( ? 40 ° C ? 25 ° C ) ?
10 6
V REF ( ?40°C) = V REF (+25°C) × ? 1 + c ?
? α ( 85 ° C ? 25 ° C ) ?
10 6
α c =
V REF ( + 25 ° C)
( ? 40 ° C ? 25 ° C )
DataSheet
REFERENCE CIRCUIT
The nominal reference voltage at the REF IN/OUT pin is 1.2 V. This
voltage of 1.2 V to overdrive the REF IN/OUT pin. The temperature
coefficient of the internal voltage reference is calculated based
on the endpoint method. To calculate the drift over
temperature, the values of the voltage reference at endpoints
(?40°C and +85°C) are measured and compared to the
reference value at 25°C, which in turn provides the slope of the
temperature coefficient curve. Figure 56 is a typical
representation of the drift over temperature. It contains two
curves: Curve X and Curve Y, which are typical representations
of two possible curvatures that are observed over the entire
specified temperature range.
–40°C +85°C
ADE7854/ADE7858/ADE7868/ADE7878
The drift curve on any particular IC can be matched with either
of these sample curves. The general relationship between the
absolute value of the voltage reference at a particular endpoint
temperature and the temperature coefficient for that region of
the curve is explained by the following two equations:
? ?
V REF ( 85°C) = V REF (25°C) × ? 1 + h ?
? ?
where α c and α h are cold and hot temperature coefficients,
respectively, calculated by
V REF ( ? 40 ° C) ? V REF ( + 25 ° C)
× 10 6 ppm/°C
A'
C'
V REF ( 85 ° C) ? V REF (25 ° C)
CURVE Y
CURVE X
+25°C
B
α h =
V REF (25 ° C)
( 85 ° C ? 25 ° C )
× 10 6 ppm/°C
A
–40°C
C
+85°C
As the sign of cold and hot temperature coefficients can vary
from one IC to another, the typical drift is specified for the
whole range with a plus-minus sign(±). To find the typical,
TEMPERATURE (°C)
Figure 56. Internal Voltage Reference Temperature Drift
is necessary for accurate analysis of the drift over temperature,
as follows:
? Considering the region between Point A and Point B in
Curve X, the reference value increases with an increase in
temperature; thus, the curve has a positive slope from A to
B. This results in a positive temperature coefficient in this
region.
minimum and maximum temperature coefficients, as listed in
the Specifications section, data based on the end-point method
is collected on ICs spread out over different lots. The minimum
and maximum temperature coefficents denote that the drift of
any particular IC will be within those limits, over the specified
temperature range, with reference to 25°C. See Figure 57 and
?
?
Considering the region between Point B and Point C in
Curve X, the slope of the curve is negative because the
voltage reference decreases with an increase in
temperature; thus, this region of the curve has a negative
temperature coefficient.
Based on similar logic, Curve Y has a negative temperature
coefficient between Point A’ and PointB and a positive
temperature coefficient between Point B and PointC’.
–50 –45 –40 –35 –30 –5 –20 –15 –10 –5 0
5 10 15 20 25 30 35 40 45 50
COLD TEMPERATURE COEFFICIENT (ppm/°C)
Figure 57. Histogram of the Reference Drift from ?40°C to +25°C
Rev. H | Page 41 of 100
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