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| 型号： | E720-EDGE720 |
| 英文描述： | 500 MHz Pin Electronics Driver. Window Comparator. and Load |
| 中文描述： | 500兆赫引脚电子驱动器。窗口比较器。和负载 |
| 文件页数： | 5/31页 |
| 文件大小： | 221K |
| 代理商： | E720-EDGE720 |
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TEST AND MEASUREMENT PRODUCTS
Edge720
Revision 4 / September 24, 2002
Load Circuit Current Accuracy
In the ideal case, the current that the load circuit will
source or sink at the load pin will be equal to the magnitude
of the current input applied to the current programming
input pin (ISC_IN, ISK_IN) scaled by a factor of 20. This
results in the ideal load circuit transfer characteristic seen
in Figure 17.
Figure 17. Ideal Load Circuit Current
Transfer Characteristic
In reality, the transfer characteristic of the load circuit
current is non-ideal and thus the current being sourced or
sunk at the LOAD pin will not be equal to the magnitude
of the programming input currents at ISC_IN or ISK_IN
scaled by a factor of 20. To account for these non-ideal
effects, the accuracy of the on-chip current sources (ISC,
ISK) is quantified by three parameters. These parameters
are all specified in the “Programmable Load Current
Accuracy” section of the datasheet and are as follows:
1.
Source/Sink Current Offset
2.
Source/Sink Current Gain
3.
Source/Sink Current Linearity Error
The Source/Sink offset current specification quantifies the
amount of current that may be needed at the programming
inputs (ISC_IN and ISK_IN) before the current being
sourced or sunk at the LOAD pin will actually turn on (see
Figure 18). This allows for the offset to be calibrated to
ensure that zero input current results in zero output current.
Circuit Description (continued)
Figure 18. Source/Sink Current Offset
The Source/Sink current gain specification accounts for
the fact that the gain of the actual on-chip current source
(ISC, ISK) may not be 20 as in the ideal case. This may
result in the possibility of a deviation in the slope of the
load circuit transfer characteristic when it is in the linear
region as shown in Figure19.
Figure 20. Source/Sink Current Gain
The Source/Sink current linearity specification quantifies
the amount the load transfer characteristic deviates from
a predicted ideal transfer characteristic in the linear
region as shown in Figure 20.
Figure 20. Source/Sink Current Linearity
Max Current
Min Current
IDEAL
ISC
ISK
ILOAD
IISC_IN, ISK_IN
Max Current
Min Current
IDEAL
ISC
ISK
ILOAD
IOS
IISC_IN, ISK_IN
Max Current
Min Current
IDEAL
ISC
IDEAL
ISK
ILOAD
IISC_IN, ISK_IN
M
ax
Gain
Min
Gain
M
in
G
ain
Max
Gain
Max Current
Min Current
IDEAL
ISC
INL
IDEAL
ISK
ILOAD
IISC_IN, ISK_IN
INL
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